1 /* $NetBSD: job.c,v 1.187 2016/05/12 20:28:34 sjg Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1989, 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Adam de Boor. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 /* 36 * Copyright (c) 1988, 1989 by Adam de Boor 37 * Copyright (c) 1989 by Berkeley Softworks 38 * All rights reserved. 39 * 40 * This code is derived from software contributed to Berkeley by 41 * Adam de Boor. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 */ 71 72 #ifndef MAKE_NATIVE 73 static char rcsid[] = "$NetBSD: job.c,v 1.187 2016/05/12 20:28:34 sjg Exp $"; 74 #else 75 #include <sys/cdefs.h> 76 #ifndef lint 77 #if 0 78 static char sccsid[] = "@(#)job.c 8.2 (Berkeley) 3/19/94"; 79 #else 80 __RCSID("$NetBSD: job.c,v 1.187 2016/05/12 20:28:34 sjg Exp $"); 81 #endif 82 #endif /* not lint */ 83 #endif 84 85 /*- 86 * job.c -- 87 * handle the creation etc. of our child processes. 88 * 89 * Interface: 90 * Job_Make Start the creation of the given target. 91 * 92 * Job_CatchChildren Check for and handle the termination of any 93 * children. This must be called reasonably 94 * frequently to keep the whole make going at 95 * a decent clip, since job table entries aren't 96 * removed until their process is caught this way. 97 * 98 * Job_CatchOutput Print any output our children have produced. 99 * Should also be called fairly frequently to 100 * keep the user informed of what's going on. 101 * If no output is waiting, it will block for 102 * a time given by the SEL_* constants, below, 103 * or until output is ready. 104 * 105 * Job_Init Called to intialize this module. in addition, 106 * any commands attached to the .BEGIN target 107 * are executed before this function returns. 108 * Hence, the makefile must have been parsed 109 * before this function is called. 110 * 111 * Job_End Cleanup any memory used. 112 * 113 * Job_ParseShell Given the line following a .SHELL target, parse 114 * the line as a shell specification. Returns 115 * FAILURE if the spec was incorrect. 116 * 117 * Job_Finish Perform any final processing which needs doing. 118 * This includes the execution of any commands 119 * which have been/were attached to the .END 120 * target. It should only be called when the 121 * job table is empty. 122 * 123 * Job_AbortAll Abort all currently running jobs. It doesn't 124 * handle output or do anything for the jobs, 125 * just kills them. It should only be called in 126 * an emergency, as it were. 127 * 128 * Job_CheckCommands Verify that the commands for a target are 129 * ok. Provide them if necessary and possible. 130 * 131 * Job_Touch Update a target without really updating it. 132 * 133 * Job_Wait Wait for all currently-running jobs to finish. 134 */ 135 136 #ifdef HAVE_CONFIG_H 137 # include "config.h" 138 #endif 139 #include <sys/types.h> 140 #include <sys/stat.h> 141 #include <sys/file.h> 142 #include <sys/time.h> 143 #include "wait.h" 144 145 #include <assert.h> 146 #include <errno.h> 147 #if !defined(USE_SELECT) && defined(HAVE_POLL_H) 148 #include <poll.h> 149 #else 150 #ifndef USE_SELECT /* no poll.h */ 151 # define USE_SELECT 152 #endif 153 #if defined(HAVE_SYS_SELECT_H) 154 # include <sys/select.h> 155 #endif 156 #endif 157 #include <signal.h> 158 #include <stdio.h> 159 #include <string.h> 160 #include <utime.h> 161 #if defined(HAVE_SYS_SOCKET_H) 162 # include <sys/socket.h> 163 #endif 164 165 #include "make.h" 166 #include "hash.h" 167 #include "dir.h" 168 #include "job.h" 169 #include "pathnames.h" 170 #include "trace.h" 171 # define STATIC static 172 173 /* 174 * error handling variables 175 */ 176 static int errors = 0; /* number of errors reported */ 177 static int aborting = 0; /* why is the make aborting? */ 178 #define ABORT_ERROR 1 /* Because of an error */ 179 #define ABORT_INTERRUPT 2 /* Because it was interrupted */ 180 #define ABORT_WAIT 3 /* Waiting for jobs to finish */ 181 #define JOB_TOKENS "+EI+" /* Token to requeue for each abort state */ 182 183 /* 184 * this tracks the number of tokens currently "out" to build jobs. 185 */ 186 int jobTokensRunning = 0; 187 int not_parallel = 0; /* set if .NOT_PARALLEL */ 188 189 /* 190 * XXX: Avoid SunOS bug... FILENO() is fp->_file, and file 191 * is a char! So when we go above 127 we turn negative! 192 */ 193 #define FILENO(a) ((unsigned) fileno(a)) 194 195 /* 196 * post-make command processing. The node postCommands is really just the 197 * .END target but we keep it around to avoid having to search for it 198 * all the time. 199 */ 200 static GNode *postCommands = NULL; 201 /* node containing commands to execute when 202 * everything else is done */ 203 static int numCommands; /* The number of commands actually printed 204 * for a target. Should this number be 205 * 0, no shell will be executed. */ 206 207 /* 208 * Return values from JobStart. 209 */ 210 #define JOB_RUNNING 0 /* Job is running */ 211 #define JOB_ERROR 1 /* Error in starting the job */ 212 #define JOB_FINISHED 2 /* The job is already finished */ 213 214 /* 215 * Descriptions for various shells. 216 * 217 * The build environment may set DEFSHELL_INDEX to one of 218 * DEFSHELL_INDEX_SH, DEFSHELL_INDEX_KSH, or DEFSHELL_INDEX_CSH, to 219 * select one of the prefedined shells as the default shell. 220 * 221 * Alternatively, the build environment may set DEFSHELL_CUSTOM to the 222 * name or the full path of a sh-compatible shell, which will be used as 223 * the default shell. 224 * 225 * ".SHELL" lines in Makefiles can choose the default shell from the 226 # set defined here, or add additional shells. 227 */ 228 229 #ifdef DEFSHELL_CUSTOM 230 #define DEFSHELL_INDEX_CUSTOM 0 231 #define DEFSHELL_INDEX_SH 1 232 #define DEFSHELL_INDEX_KSH 2 233 #define DEFSHELL_INDEX_CSH 3 234 #else /* !DEFSHELL_CUSTOM */ 235 #define DEFSHELL_INDEX_SH 0 236 #define DEFSHELL_INDEX_KSH 1 237 #define DEFSHELL_INDEX_CSH 2 238 #endif /* !DEFSHELL_CUSTOM */ 239 240 #ifndef DEFSHELL_INDEX 241 #define DEFSHELL_INDEX 0 /* DEFSHELL_INDEX_CUSTOM or DEFSHELL_INDEX_SH */ 242 #endif /* !DEFSHELL_INDEX */ 243 244 static Shell shells[] = { 245 #ifdef DEFSHELL_CUSTOM 246 /* 247 * An sh-compatible shell with a non-standard name. 248 * 249 * Keep this in sync with the "sh" description below, but avoid 250 * non-portable features that might not be supplied by all 251 * sh-compatible shells. 252 */ 253 { 254 DEFSHELL_CUSTOM, 255 FALSE, "", "", "", 0, 256 FALSE, "echo \"%s\"\n", "%s\n", "{ %s \n} || exit $?\n", "'\n'", '#', 257 "", 258 "", 259 }, 260 #endif /* DEFSHELL_CUSTOM */ 261 /* 262 * SH description. Echo control is also possible and, under 263 * sun UNIX anyway, one can even control error checking. 264 */ 265 { 266 "sh", 267 FALSE, "", "", "", 0, 268 FALSE, "echo \"%s\"\n", "%s\n", "{ %s \n} || exit $?\n", "'\n'", '#', 269 #if defined(MAKE_NATIVE) && defined(__NetBSD__) 270 "q", 271 #else 272 "", 273 #endif 274 "", 275 }, 276 /* 277 * KSH description. 278 */ 279 { 280 "ksh", 281 TRUE, "set +v", "set -v", "set +v", 6, 282 FALSE, "echo \"%s\"\n", "%s\n", "{ %s \n} || exit $?\n", "'\n'", '#', 283 "v", 284 "", 285 }, 286 /* 287 * CSH description. The csh can do echo control by playing 288 * with the setting of the 'echo' shell variable. Sadly, 289 * however, it is unable to do error control nicely. 290 */ 291 { 292 "csh", 293 TRUE, "unset verbose", "set verbose", "unset verbose", 10, 294 FALSE, "echo \"%s\"\n", "csh -c \"%s || exit 0\"\n", "", "'\\\n'", '#', 295 "v", "e", 296 }, 297 /* 298 * UNKNOWN. 299 */ 300 { 301 NULL, 302 FALSE, NULL, NULL, NULL, 0, 303 FALSE, NULL, NULL, NULL, NULL, 0, 304 NULL, NULL, 305 } 306 }; 307 static Shell *commandShell = &shells[DEFSHELL_INDEX]; /* this is the shell to 308 * which we pass all 309 * commands in the Makefile. 310 * It is set by the 311 * Job_ParseShell function */ 312 const char *shellPath = NULL, /* full pathname of 313 * executable image */ 314 *shellName = NULL; /* last component of shell */ 315 char *shellErrFlag = NULL; 316 static const char *shellArgv = NULL; /* Custom shell args */ 317 318 319 STATIC Job *job_table; /* The structures that describe them */ 320 STATIC Job *job_table_end; /* job_table + maxJobs */ 321 static int wantToken; /* we want a token */ 322 static int lurking_children = 0; 323 static int make_suspended = 0; /* non-zero if we've seen a SIGTSTP (etc) */ 324 325 /* 326 * Set of descriptors of pipes connected to 327 * the output channels of children 328 */ 329 static struct pollfd *fds = NULL; 330 static Job **jobfds = NULL; 331 static int nfds = 0; 332 static void watchfd(Job *); 333 static void clearfd(Job *); 334 static int readyfd(Job *); 335 336 STATIC GNode *lastNode; /* The node for which output was most recently 337 * produced. */ 338 static char *targPrefix = NULL; /* What we print at the start of TARG_FMT */ 339 static Job tokenWaitJob; /* token wait pseudo-job */ 340 341 static Job childExitJob; /* child exit pseudo-job */ 342 #define CHILD_EXIT "." 343 #define DO_JOB_RESUME "R" 344 345 #define TARG_FMT "%s %s ---\n" /* Default format */ 346 #define MESSAGE(fp, gn) \ 347 if (maxJobs != 1 && targPrefix && *targPrefix) \ 348 (void)fprintf(fp, TARG_FMT, targPrefix, gn->name) 349 350 static sigset_t caught_signals; /* Set of signals we handle */ 351 #if defined(SYSV) 352 #define KILLPG(pid, sig) kill(-(pid), (sig)) 353 #else 354 #define KILLPG(pid, sig) killpg((pid), (sig)) 355 #endif 356 357 static void JobChildSig(int); 358 static void JobContinueSig(int); 359 static Job *JobFindPid(int, int, Boolean); 360 static int JobPrintCommand(void *, void *); 361 static int JobSaveCommand(void *, void *); 362 static void JobClose(Job *); 363 static void JobExec(Job *, char **); 364 static void JobMakeArgv(Job *, char **); 365 static int JobStart(GNode *, int); 366 static char *JobOutput(Job *, char *, char *, int); 367 static void JobDoOutput(Job *, Boolean); 368 static Shell *JobMatchShell(const char *); 369 static void JobInterrupt(int, int) MAKE_ATTR_DEAD; 370 static void JobRestartJobs(void); 371 static void JobTokenAdd(void); 372 static void JobSigLock(sigset_t *); 373 static void JobSigUnlock(sigset_t *); 374 static void JobSigReset(void); 375 376 #ifdef __OpenBSD__ 377 const char *malloc_options="S"; 378 #else 379 const char *malloc_options="A"; 380 #endif 381 382 static void 383 job_table_dump(const char *where) 384 { 385 Job *job; 386 387 fprintf(debug_file, "job table @ %s\n", where); 388 for (job = job_table; job < job_table_end; job++) { 389 fprintf(debug_file, "job %d, status %d, flags %d, pid %d\n", 390 (int)(job - job_table), job->job_state, job->flags, job->pid); 391 } 392 } 393 394 /* 395 * JobSigLock/JobSigUnlock 396 * 397 * Signal lock routines to get exclusive access. Currently used to 398 * protect `jobs' and `stoppedJobs' list manipulations. 399 */ 400 static void JobSigLock(sigset_t *omaskp) 401 { 402 if (sigprocmask(SIG_BLOCK, &caught_signals, omaskp) != 0) { 403 Punt("JobSigLock: sigprocmask: %s", strerror(errno)); 404 sigemptyset(omaskp); 405 } 406 } 407 408 static void JobSigUnlock(sigset_t *omaskp) 409 { 410 (void)sigprocmask(SIG_SETMASK, omaskp, NULL); 411 } 412 413 static void 414 JobCreatePipe(Job *job, int minfd) 415 { 416 int i, fd; 417 418 if (pipe(job->jobPipe) == -1) 419 Punt("Cannot create pipe: %s", strerror(errno)); 420 421 for (i = 0; i < 2; i++) { 422 /* Avoid using low numbered fds */ 423 fd = fcntl(job->jobPipe[i], F_DUPFD, minfd); 424 if (fd != -1) { 425 close(job->jobPipe[i]); 426 job->jobPipe[i] = fd; 427 } 428 } 429 430 /* Set close-on-exec flag for both */ 431 (void)fcntl(job->jobPipe[0], F_SETFD, FD_CLOEXEC); 432 (void)fcntl(job->jobPipe[1], F_SETFD, FD_CLOEXEC); 433 434 /* 435 * We mark the input side of the pipe non-blocking; we poll(2) the 436 * pipe when we're waiting for a job token, but we might lose the 437 * race for the token when a new one becomes available, so the read 438 * from the pipe should not block. 439 */ 440 fcntl(job->jobPipe[0], F_SETFL, 441 fcntl(job->jobPipe[0], F_GETFL, 0) | O_NONBLOCK); 442 } 443 444 /*- 445 *----------------------------------------------------------------------- 446 * JobCondPassSig -- 447 * Pass a signal to a job 448 * 449 * Input: 450 * signop Signal to send it 451 * 452 * Side Effects: 453 * None, except the job may bite it. 454 * 455 *----------------------------------------------------------------------- 456 */ 457 static void 458 JobCondPassSig(int signo) 459 { 460 Job *job; 461 462 if (DEBUG(JOB)) { 463 (void)fprintf(debug_file, "JobCondPassSig(%d) called.\n", signo); 464 } 465 466 for (job = job_table; job < job_table_end; job++) { 467 if (job->job_state != JOB_ST_RUNNING) 468 continue; 469 if (DEBUG(JOB)) { 470 (void)fprintf(debug_file, 471 "JobCondPassSig passing signal %d to child %d.\n", 472 signo, job->pid); 473 } 474 KILLPG(job->pid, signo); 475 } 476 } 477 478 /*- 479 *----------------------------------------------------------------------- 480 * JobChldSig -- 481 * SIGCHLD handler. 482 * 483 * Input: 484 * signo The signal number we've received 485 * 486 * Results: 487 * None. 488 * 489 * Side Effects: 490 * Sends a token on the child exit pipe to wake us up from 491 * select()/poll(). 492 * 493 *----------------------------------------------------------------------- 494 */ 495 static void 496 JobChildSig(int signo MAKE_ATTR_UNUSED) 497 { 498 while (write(childExitJob.outPipe, CHILD_EXIT, 1) == -1 && errno == EAGAIN) 499 continue; 500 } 501 502 503 /*- 504 *----------------------------------------------------------------------- 505 * JobContinueSig -- 506 * Resume all stopped jobs. 507 * 508 * Input: 509 * signo The signal number we've received 510 * 511 * Results: 512 * None. 513 * 514 * Side Effects: 515 * Jobs start running again. 516 * 517 *----------------------------------------------------------------------- 518 */ 519 static void 520 JobContinueSig(int signo MAKE_ATTR_UNUSED) 521 { 522 /* 523 * Defer sending to SIGCONT to our stopped children until we return 524 * from the signal handler. 525 */ 526 while (write(childExitJob.outPipe, DO_JOB_RESUME, 1) == -1 && 527 errno == EAGAIN) 528 continue; 529 } 530 531 /*- 532 *----------------------------------------------------------------------- 533 * JobPassSig -- 534 * Pass a signal on to all jobs, then resend to ourselves. 535 * 536 * Input: 537 * signo The signal number we've received 538 * 539 * Results: 540 * None. 541 * 542 * Side Effects: 543 * We die by the same signal. 544 * 545 *----------------------------------------------------------------------- 546 */ 547 MAKE_ATTR_DEAD static void 548 JobPassSig_int(int signo) 549 { 550 /* Run .INTERRUPT target then exit */ 551 JobInterrupt(TRUE, signo); 552 } 553 554 MAKE_ATTR_DEAD static void 555 JobPassSig_term(int signo) 556 { 557 /* Dont run .INTERRUPT target then exit */ 558 JobInterrupt(FALSE, signo); 559 } 560 561 static void 562 JobPassSig_suspend(int signo) 563 { 564 sigset_t nmask, omask; 565 struct sigaction act; 566 567 /* Suppress job started/continued messages */ 568 make_suspended = 1; 569 570 /* Pass the signal onto every job */ 571 JobCondPassSig(signo); 572 573 /* 574 * Send ourselves the signal now we've given the message to everyone else. 575 * Note we block everything else possible while we're getting the signal. 576 * This ensures that all our jobs get continued when we wake up before 577 * we take any other signal. 578 */ 579 sigfillset(&nmask); 580 sigdelset(&nmask, signo); 581 (void)sigprocmask(SIG_SETMASK, &nmask, &omask); 582 583 act.sa_handler = SIG_DFL; 584 sigemptyset(&act.sa_mask); 585 act.sa_flags = 0; 586 (void)sigaction(signo, &act, NULL); 587 588 if (DEBUG(JOB)) { 589 (void)fprintf(debug_file, 590 "JobPassSig passing signal %d to self.\n", signo); 591 } 592 593 (void)kill(getpid(), signo); 594 595 /* 596 * We've been continued. 597 * 598 * A whole host of signals continue to happen! 599 * SIGCHLD for any processes that actually suspended themselves. 600 * SIGCHLD for any processes that exited while we were alseep. 601 * The SIGCONT that actually caused us to wakeup. 602 * 603 * Since we defer passing the SIGCONT on to our children until 604 * the main processing loop, we can be sure that all the SIGCHLD 605 * events will have happened by then - and that the waitpid() will 606 * collect the child 'suspended' events. 607 * For correct sequencing we just need to ensure we process the 608 * waitpid() before passign on the SIGCONT. 609 * 610 * In any case nothing else is needed here. 611 */ 612 613 /* Restore handler and signal mask */ 614 act.sa_handler = JobPassSig_suspend; 615 (void)sigaction(signo, &act, NULL); 616 (void)sigprocmask(SIG_SETMASK, &omask, NULL); 617 } 618 619 /*- 620 *----------------------------------------------------------------------- 621 * JobFindPid -- 622 * Compare the pid of the job with the given pid and return 0 if they 623 * are equal. This function is called from Job_CatchChildren 624 * to find the job descriptor of the finished job. 625 * 626 * Input: 627 * job job to examine 628 * pid process id desired 629 * 630 * Results: 631 * Job with matching pid 632 * 633 * Side Effects: 634 * None 635 *----------------------------------------------------------------------- 636 */ 637 static Job * 638 JobFindPid(int pid, int status, Boolean isJobs) 639 { 640 Job *job; 641 642 for (job = job_table; job < job_table_end; job++) { 643 if ((job->job_state == status) && job->pid == pid) 644 return job; 645 } 646 if (DEBUG(JOB) && isJobs) 647 job_table_dump("no pid"); 648 return NULL; 649 } 650 651 /*- 652 *----------------------------------------------------------------------- 653 * JobPrintCommand -- 654 * Put out another command for the given job. If the command starts 655 * with an @ or a - we process it specially. In the former case, 656 * so long as the -s and -n flags weren't given to make, we stick 657 * a shell-specific echoOff command in the script. In the latter, 658 * we ignore errors for the entire job, unless the shell has error 659 * control. 660 * If the command is just "..." we take all future commands for this 661 * job to be commands to be executed once the entire graph has been 662 * made and return non-zero to signal that the end of the commands 663 * was reached. These commands are later attached to the postCommands 664 * node and executed by Job_End when all things are done. 665 * This function is called from JobStart via Lst_ForEach. 666 * 667 * Input: 668 * cmdp command string to print 669 * jobp job for which to print it 670 * 671 * Results: 672 * Always 0, unless the command was "..." 673 * 674 * Side Effects: 675 * If the command begins with a '-' and the shell has no error control, 676 * the JOB_IGNERR flag is set in the job descriptor. 677 * If the command is "..." and we're not ignoring such things, 678 * tailCmds is set to the successor node of the cmd. 679 * numCommands is incremented if the command is actually printed. 680 *----------------------------------------------------------------------- 681 */ 682 static int 683 JobPrintCommand(void *cmdp, void *jobp) 684 { 685 Boolean noSpecials; /* true if we shouldn't worry about 686 * inserting special commands into 687 * the input stream. */ 688 Boolean shutUp = FALSE; /* true if we put a no echo command 689 * into the command file */ 690 Boolean errOff = FALSE; /* true if we turned error checking 691 * off before printing the command 692 * and need to turn it back on */ 693 const char *cmdTemplate; /* Template to use when printing the 694 * command */ 695 char *cmdStart; /* Start of expanded command */ 696 char *escCmd = NULL; /* Command with quotes/backticks escaped */ 697 char *cmd = (char *)cmdp; 698 Job *job = (Job *)jobp; 699 int i, j; 700 701 noSpecials = NoExecute(job->node); 702 703 if (strcmp(cmd, "...") == 0) { 704 job->node->type |= OP_SAVE_CMDS; 705 if ((job->flags & JOB_IGNDOTS) == 0) { 706 job->tailCmds = Lst_Succ(Lst_Member(job->node->commands, 707 cmd)); 708 return 1; 709 } 710 return 0; 711 } 712 713 #define DBPRINTF(fmt, arg) if (DEBUG(JOB)) { \ 714 (void)fprintf(debug_file, fmt, arg); \ 715 } \ 716 (void)fprintf(job->cmdFILE, fmt, arg); \ 717 (void)fflush(job->cmdFILE); 718 719 numCommands += 1; 720 721 cmdStart = cmd = Var_Subst(NULL, cmd, job->node, VARF_WANTRES); 722 723 cmdTemplate = "%s\n"; 724 725 /* 726 * Check for leading @' and -'s to control echoing and error checking. 727 */ 728 while (*cmd == '@' || *cmd == '-' || (*cmd == '+')) { 729 switch (*cmd) { 730 case '@': 731 shutUp = DEBUG(LOUD) ? FALSE : TRUE; 732 break; 733 case '-': 734 errOff = TRUE; 735 break; 736 case '+': 737 if (noSpecials) { 738 /* 739 * We're not actually executing anything... 740 * but this one needs to be - use compat mode just for it. 741 */ 742 CompatRunCommand(cmdp, job->node); 743 return 0; 744 } 745 break; 746 } 747 cmd++; 748 } 749 750 while (isspace((unsigned char) *cmd)) 751 cmd++; 752 753 /* 754 * If the shell doesn't have error control the alternate echo'ing will 755 * be done (to avoid showing additional error checking code) 756 * and this will need the characters '$ ` \ "' escaped 757 */ 758 759 if (!commandShell->hasErrCtl) { 760 /* Worst that could happen is every char needs escaping. */ 761 escCmd = bmake_malloc((strlen(cmd) * 2) + 1); 762 for (i = 0, j= 0; cmd[i] != '\0'; i++, j++) { 763 if (cmd[i] == '$' || cmd[i] == '`' || cmd[i] == '\\' || 764 cmd[i] == '"') 765 escCmd[j++] = '\\'; 766 escCmd[j] = cmd[i]; 767 } 768 escCmd[j] = 0; 769 } 770 771 if (shutUp) { 772 if (!(job->flags & JOB_SILENT) && !noSpecials && 773 commandShell->hasEchoCtl) { 774 DBPRINTF("%s\n", commandShell->echoOff); 775 } else { 776 if (commandShell->hasErrCtl) 777 shutUp = FALSE; 778 } 779 } 780 781 if (errOff) { 782 if (!noSpecials) { 783 if (commandShell->hasErrCtl) { 784 /* 785 * we don't want the error-control commands showing 786 * up either, so we turn off echoing while executing 787 * them. We could put another field in the shell 788 * structure to tell JobDoOutput to look for this 789 * string too, but why make it any more complex than 790 * it already is? 791 */ 792 if (!(job->flags & JOB_SILENT) && !shutUp && 793 commandShell->hasEchoCtl) { 794 DBPRINTF("%s\n", commandShell->echoOff); 795 DBPRINTF("%s\n", commandShell->ignErr); 796 DBPRINTF("%s\n", commandShell->echoOn); 797 } else { 798 DBPRINTF("%s\n", commandShell->ignErr); 799 } 800 } else if (commandShell->ignErr && 801 (*commandShell->ignErr != '\0')) 802 { 803 /* 804 * The shell has no error control, so we need to be 805 * weird to get it to ignore any errors from the command. 806 * If echoing is turned on, we turn it off and use the 807 * errCheck template to echo the command. Leave echoing 808 * off so the user doesn't see the weirdness we go through 809 * to ignore errors. Set cmdTemplate to use the weirdness 810 * instead of the simple "%s\n" template. 811 */ 812 job->flags |= JOB_IGNERR; 813 if (!(job->flags & JOB_SILENT) && !shutUp) { 814 if (commandShell->hasEchoCtl) { 815 DBPRINTF("%s\n", commandShell->echoOff); 816 } 817 DBPRINTF(commandShell->errCheck, escCmd); 818 shutUp = TRUE; 819 } else { 820 if (!shutUp) { 821 DBPRINTF(commandShell->errCheck, escCmd); 822 } 823 } 824 cmdTemplate = commandShell->ignErr; 825 /* 826 * The error ignoration (hee hee) is already taken care 827 * of by the ignErr template, so pretend error checking 828 * is still on. 829 */ 830 errOff = FALSE; 831 } else { 832 errOff = FALSE; 833 } 834 } else { 835 errOff = FALSE; 836 } 837 } else { 838 839 /* 840 * If errors are being checked and the shell doesn't have error control 841 * but does supply an errOut template, then setup commands to run 842 * through it. 843 */ 844 845 if (!commandShell->hasErrCtl && commandShell->errOut && 846 (*commandShell->errOut != '\0')) { 847 if (!(job->flags & JOB_SILENT) && !shutUp) { 848 if (commandShell->hasEchoCtl) { 849 DBPRINTF("%s\n", commandShell->echoOff); 850 } 851 DBPRINTF(commandShell->errCheck, escCmd); 852 shutUp = TRUE; 853 } 854 /* If it's a comment line or blank, treat as an ignored error */ 855 if ((escCmd[0] == commandShell->commentChar) || 856 (escCmd[0] == 0)) 857 cmdTemplate = commandShell->ignErr; 858 else 859 cmdTemplate = commandShell->errOut; 860 errOff = FALSE; 861 } 862 } 863 864 if (DEBUG(SHELL) && strcmp(shellName, "sh") == 0 && 865 (job->flags & JOB_TRACED) == 0) { 866 DBPRINTF("set -%s\n", "x"); 867 job->flags |= JOB_TRACED; 868 } 869 870 DBPRINTF(cmdTemplate, cmd); 871 free(cmdStart); 872 free(escCmd); 873 if (errOff) { 874 /* 875 * If echoing is already off, there's no point in issuing the 876 * echoOff command. Otherwise we issue it and pretend it was on 877 * for the whole command... 878 */ 879 if (!shutUp && !(job->flags & JOB_SILENT) && commandShell->hasEchoCtl){ 880 DBPRINTF("%s\n", commandShell->echoOff); 881 shutUp = TRUE; 882 } 883 DBPRINTF("%s\n", commandShell->errCheck); 884 } 885 if (shutUp && commandShell->hasEchoCtl) { 886 DBPRINTF("%s\n", commandShell->echoOn); 887 } 888 return 0; 889 } 890 891 /*- 892 *----------------------------------------------------------------------- 893 * JobSaveCommand -- 894 * Save a command to be executed when everything else is done. 895 * Callback function for JobFinish... 896 * 897 * Results: 898 * Always returns 0 899 * 900 * Side Effects: 901 * The command is tacked onto the end of postCommands's commands list. 902 * 903 *----------------------------------------------------------------------- 904 */ 905 static int 906 JobSaveCommand(void *cmd, void *gn) 907 { 908 cmd = Var_Subst(NULL, (char *)cmd, (GNode *)gn, VARF_WANTRES); 909 (void)Lst_AtEnd(postCommands->commands, cmd); 910 return(0); 911 } 912 913 914 /*- 915 *----------------------------------------------------------------------- 916 * JobClose -- 917 * Called to close both input and output pipes when a job is finished. 918 * 919 * Results: 920 * Nada 921 * 922 * Side Effects: 923 * The file descriptors associated with the job are closed. 924 * 925 *----------------------------------------------------------------------- 926 */ 927 static void 928 JobClose(Job *job) 929 { 930 clearfd(job); 931 (void)close(job->outPipe); 932 job->outPipe = -1; 933 934 JobDoOutput(job, TRUE); 935 (void)close(job->inPipe); 936 job->inPipe = -1; 937 } 938 939 /*- 940 *----------------------------------------------------------------------- 941 * JobFinish -- 942 * Do final processing for the given job including updating 943 * parents and starting new jobs as available/necessary. Note 944 * that we pay no attention to the JOB_IGNERR flag here. 945 * This is because when we're called because of a noexecute flag 946 * or something, jstat.w_status is 0 and when called from 947 * Job_CatchChildren, the status is zeroed if it s/b ignored. 948 * 949 * Input: 950 * job job to finish 951 * status sub-why job went away 952 * 953 * Results: 954 * None 955 * 956 * Side Effects: 957 * Final commands for the job are placed on postCommands. 958 * 959 * If we got an error and are aborting (aborting == ABORT_ERROR) and 960 * the job list is now empty, we are done for the day. 961 * If we recognized an error (errors !=0), we set the aborting flag 962 * to ABORT_ERROR so no more jobs will be started. 963 *----------------------------------------------------------------------- 964 */ 965 /*ARGSUSED*/ 966 static void 967 JobFinish (Job *job, WAIT_T status) 968 { 969 Boolean done, return_job_token; 970 971 if (DEBUG(JOB)) { 972 fprintf(debug_file, "Jobfinish: %d [%s], status %d\n", 973 job->pid, job->node->name, status); 974 } 975 976 if ((WIFEXITED(status) && 977 (((WEXITSTATUS(status) != 0) && !(job->flags & JOB_IGNERR)))) || 978 WIFSIGNALED(status)) 979 { 980 /* 981 * If it exited non-zero and either we're doing things our 982 * way or we're not ignoring errors, the job is finished. 983 * Similarly, if the shell died because of a signal 984 * the job is also finished. In these 985 * cases, finish out the job's output before printing the exit 986 * status... 987 */ 988 JobClose(job); 989 if (job->cmdFILE != NULL && job->cmdFILE != stdout) { 990 (void)fclose(job->cmdFILE); 991 job->cmdFILE = NULL; 992 } 993 done = TRUE; 994 } else if (WIFEXITED(status)) { 995 /* 996 * Deal with ignored errors in -B mode. We need to print a message 997 * telling of the ignored error as well as setting status.w_status 998 * to 0 so the next command gets run. To do this, we set done to be 999 * TRUE if in -B mode and the job exited non-zero. 1000 */ 1001 done = WEXITSTATUS(status) != 0; 1002 /* 1003 * Old comment said: "Note we don't 1004 * want to close down any of the streams until we know we're at the 1005 * end." 1006 * But we do. Otherwise when are we going to print the rest of the 1007 * stuff? 1008 */ 1009 JobClose(job); 1010 } else { 1011 /* 1012 * No need to close things down or anything. 1013 */ 1014 done = FALSE; 1015 } 1016 1017 if (done) { 1018 if (WIFEXITED(status)) { 1019 if (DEBUG(JOB)) { 1020 (void)fprintf(debug_file, "Process %d [%s] exited.\n", 1021 job->pid, job->node->name); 1022 } 1023 if (WEXITSTATUS(status) != 0) { 1024 if (job->node != lastNode) { 1025 MESSAGE(stdout, job->node); 1026 lastNode = job->node; 1027 } 1028 #ifdef USE_META 1029 if (useMeta) { 1030 meta_job_error(job, job->node, job->flags, WEXITSTATUS(status)); 1031 } 1032 #endif 1033 (void)printf("*** [%s] Error code %d%s\n", 1034 job->node->name, 1035 WEXITSTATUS(status), 1036 (job->flags & JOB_IGNERR) ? " (ignored)" : ""); 1037 if (job->flags & JOB_IGNERR) { 1038 WAIT_STATUS(status) = 0; 1039 } else { 1040 PrintOnError(job->node, NULL); 1041 } 1042 } else if (DEBUG(JOB)) { 1043 if (job->node != lastNode) { 1044 MESSAGE(stdout, job->node); 1045 lastNode = job->node; 1046 } 1047 (void)printf("*** [%s] Completed successfully\n", 1048 job->node->name); 1049 } 1050 } else { 1051 if (job->node != lastNode) { 1052 MESSAGE(stdout, job->node); 1053 lastNode = job->node; 1054 } 1055 (void)printf("*** [%s] Signal %d\n", 1056 job->node->name, WTERMSIG(status)); 1057 } 1058 (void)fflush(stdout); 1059 } 1060 1061 #ifdef USE_META 1062 if (useMeta) { 1063 int x; 1064 1065 if ((x = meta_job_finish(job)) != 0 && status == 0) { 1066 status = x; 1067 } 1068 } 1069 #endif 1070 1071 return_job_token = FALSE; 1072 1073 Trace_Log(JOBEND, job); 1074 if (!(job->flags & JOB_SPECIAL)) { 1075 if ((WAIT_STATUS(status) != 0) || 1076 (aborting == ABORT_ERROR) || 1077 (aborting == ABORT_INTERRUPT)) 1078 return_job_token = TRUE; 1079 } 1080 1081 if ((aborting != ABORT_ERROR) && (aborting != ABORT_INTERRUPT) && 1082 (WAIT_STATUS(status) == 0)) { 1083 /* 1084 * As long as we aren't aborting and the job didn't return a non-zero 1085 * status that we shouldn't ignore, we call Make_Update to update 1086 * the parents. In addition, any saved commands for the node are placed 1087 * on the .END target. 1088 */ 1089 if (job->tailCmds != NULL) { 1090 Lst_ForEachFrom(job->node->commands, job->tailCmds, 1091 JobSaveCommand, 1092 job->node); 1093 } 1094 job->node->made = MADE; 1095 if (!(job->flags & JOB_SPECIAL)) 1096 return_job_token = TRUE; 1097 Make_Update(job->node); 1098 job->job_state = JOB_ST_FREE; 1099 } else if (WAIT_STATUS(status)) { 1100 errors += 1; 1101 job->job_state = JOB_ST_FREE; 1102 } 1103 1104 /* 1105 * Set aborting if any error. 1106 */ 1107 if (errors && !keepgoing && (aborting != ABORT_INTERRUPT)) { 1108 /* 1109 * If we found any errors in this batch of children and the -k flag 1110 * wasn't given, we set the aborting flag so no more jobs get 1111 * started. 1112 */ 1113 aborting = ABORT_ERROR; 1114 } 1115 1116 if (return_job_token) 1117 Job_TokenReturn(); 1118 1119 if (aborting == ABORT_ERROR && jobTokensRunning == 0) { 1120 /* 1121 * If we are aborting and the job table is now empty, we finish. 1122 */ 1123 Finish(errors); 1124 } 1125 } 1126 1127 /*- 1128 *----------------------------------------------------------------------- 1129 * Job_Touch -- 1130 * Touch the given target. Called by JobStart when the -t flag was 1131 * given 1132 * 1133 * Input: 1134 * gn the node of the file to touch 1135 * silent TRUE if should not print message 1136 * 1137 * Results: 1138 * None 1139 * 1140 * Side Effects: 1141 * The data modification of the file is changed. In addition, if the 1142 * file did not exist, it is created. 1143 *----------------------------------------------------------------------- 1144 */ 1145 void 1146 Job_Touch(GNode *gn, Boolean silent) 1147 { 1148 int streamID; /* ID of stream opened to do the touch */ 1149 struct utimbuf times; /* Times for utime() call */ 1150 1151 if (gn->type & (OP_JOIN|OP_USE|OP_USEBEFORE|OP_EXEC|OP_OPTIONAL| 1152 OP_SPECIAL|OP_PHONY)) { 1153 /* 1154 * .JOIN, .USE, .ZEROTIME and .OPTIONAL targets are "virtual" targets 1155 * and, as such, shouldn't really be created. 1156 */ 1157 return; 1158 } 1159 1160 if (!silent || NoExecute(gn)) { 1161 (void)fprintf(stdout, "touch %s\n", gn->name); 1162 (void)fflush(stdout); 1163 } 1164 1165 if (NoExecute(gn)) { 1166 return; 1167 } 1168 1169 if (gn->type & OP_ARCHV) { 1170 Arch_Touch(gn); 1171 } else if (gn->type & OP_LIB) { 1172 Arch_TouchLib(gn); 1173 } else { 1174 char *file = gn->path ? gn->path : gn->name; 1175 1176 times.actime = times.modtime = now; 1177 if (utime(file, ×) < 0){ 1178 streamID = open(file, O_RDWR | O_CREAT, 0666); 1179 1180 if (streamID >= 0) { 1181 char c; 1182 1183 /* 1184 * Read and write a byte to the file to change the 1185 * modification time, then close the file. 1186 */ 1187 if (read(streamID, &c, 1) == 1) { 1188 (void)lseek(streamID, (off_t)0, SEEK_SET); 1189 while (write(streamID, &c, 1) == -1 && errno == EAGAIN) 1190 continue; 1191 } 1192 1193 (void)close(streamID); 1194 } else { 1195 (void)fprintf(stdout, "*** couldn't touch %s: %s", 1196 file, strerror(errno)); 1197 (void)fflush(stdout); 1198 } 1199 } 1200 } 1201 } 1202 1203 /*- 1204 *----------------------------------------------------------------------- 1205 * Job_CheckCommands -- 1206 * Make sure the given node has all the commands it needs. 1207 * 1208 * Input: 1209 * gn The target whose commands need verifying 1210 * abortProc Function to abort with message 1211 * 1212 * Results: 1213 * TRUE if the commands list is/was ok. 1214 * 1215 * Side Effects: 1216 * The node will have commands from the .DEFAULT rule added to it 1217 * if it needs them. 1218 *----------------------------------------------------------------------- 1219 */ 1220 Boolean 1221 Job_CheckCommands(GNode *gn, void (*abortProc)(const char *, ...)) 1222 { 1223 if (OP_NOP(gn->type) && Lst_IsEmpty(gn->commands) && 1224 ((gn->type & OP_LIB) == 0 || Lst_IsEmpty(gn->children))) { 1225 /* 1226 * No commands. Look for .DEFAULT rule from which we might infer 1227 * commands 1228 */ 1229 if ((DEFAULT != NULL) && !Lst_IsEmpty(DEFAULT->commands) && 1230 (gn->type & OP_SPECIAL) == 0) { 1231 char *p1; 1232 /* 1233 * Make only looks for a .DEFAULT if the node was never the 1234 * target of an operator, so that's what we do too. If 1235 * a .DEFAULT was given, we substitute its commands for gn's 1236 * commands and set the IMPSRC variable to be the target's name 1237 * The DEFAULT node acts like a transformation rule, in that 1238 * gn also inherits any attributes or sources attached to 1239 * .DEFAULT itself. 1240 */ 1241 Make_HandleUse(DEFAULT, gn); 1242 Var_Set(IMPSRC, Var_Value(TARGET, gn, &p1), gn, 0); 1243 free(p1); 1244 } else if (Dir_MTime(gn, 0) == 0 && (gn->type & OP_SPECIAL) == 0) { 1245 /* 1246 * The node wasn't the target of an operator we have no .DEFAULT 1247 * rule to go on and the target doesn't already exist. There's 1248 * nothing more we can do for this branch. If the -k flag wasn't 1249 * given, we stop in our tracks, otherwise we just don't update 1250 * this node's parents so they never get examined. 1251 */ 1252 static const char msg[] = ": don't know how to make"; 1253 1254 if (gn->flags & FROM_DEPEND) { 1255 if (!Job_RunTarget(".STALE", gn->fname)) 1256 fprintf(stdout, "%s: %s, %d: ignoring stale %s for %s\n", 1257 progname, gn->fname, gn->lineno, makeDependfile, 1258 gn->name); 1259 return TRUE; 1260 } 1261 1262 if (gn->type & OP_OPTIONAL) { 1263 (void)fprintf(stdout, "%s%s %s (ignored)\n", progname, 1264 msg, gn->name); 1265 (void)fflush(stdout); 1266 } else if (keepgoing) { 1267 (void)fprintf(stdout, "%s%s %s (continuing)\n", progname, 1268 msg, gn->name); 1269 (void)fflush(stdout); 1270 return FALSE; 1271 } else { 1272 (*abortProc)("%s%s %s. Stop", progname, msg, gn->name); 1273 return FALSE; 1274 } 1275 } 1276 } 1277 return TRUE; 1278 } 1279 1280 /*- 1281 *----------------------------------------------------------------------- 1282 * JobExec -- 1283 * Execute the shell for the given job. Called from JobStart 1284 * 1285 * Input: 1286 * job Job to execute 1287 * 1288 * Results: 1289 * None. 1290 * 1291 * Side Effects: 1292 * A shell is executed, outputs is altered and the Job structure added 1293 * to the job table. 1294 * 1295 *----------------------------------------------------------------------- 1296 */ 1297 static void 1298 JobExec(Job *job, char **argv) 1299 { 1300 int cpid; /* ID of new child */ 1301 sigset_t mask; 1302 1303 job->flags &= ~JOB_TRACED; 1304 1305 if (DEBUG(JOB)) { 1306 int i; 1307 1308 (void)fprintf(debug_file, "Running %s %sly\n", job->node->name, "local"); 1309 (void)fprintf(debug_file, "\tCommand: "); 1310 for (i = 0; argv[i] != NULL; i++) { 1311 (void)fprintf(debug_file, "%s ", argv[i]); 1312 } 1313 (void)fprintf(debug_file, "\n"); 1314 } 1315 1316 /* 1317 * Some jobs produce no output and it's disconcerting to have 1318 * no feedback of their running (since they produce no output, the 1319 * banner with their name in it never appears). This is an attempt to 1320 * provide that feedback, even if nothing follows it. 1321 */ 1322 if ((lastNode != job->node) && !(job->flags & JOB_SILENT)) { 1323 MESSAGE(stdout, job->node); 1324 lastNode = job->node; 1325 } 1326 1327 /* No interruptions until this job is on the `jobs' list */ 1328 JobSigLock(&mask); 1329 1330 /* Pre-emptively mark job running, pid still zero though */ 1331 job->job_state = JOB_ST_RUNNING; 1332 1333 cpid = vFork(); 1334 if (cpid == -1) 1335 Punt("Cannot vfork: %s", strerror(errno)); 1336 1337 if (cpid == 0) { 1338 /* Child */ 1339 sigset_t tmask; 1340 1341 #ifdef USE_META 1342 if (useMeta) { 1343 meta_job_child(job); 1344 } 1345 #endif 1346 /* 1347 * Reset all signal handlers; this is necessary because we also 1348 * need to unblock signals before we exec(2). 1349 */ 1350 JobSigReset(); 1351 1352 /* Now unblock signals */ 1353 sigemptyset(&tmask); 1354 JobSigUnlock(&tmask); 1355 1356 /* 1357 * Must duplicate the input stream down to the child's input and 1358 * reset it to the beginning (again). Since the stream was marked 1359 * close-on-exec, we must clear that bit in the new input. 1360 */ 1361 if (dup2(FILENO(job->cmdFILE), 0) == -1) { 1362 execError("dup2", "job->cmdFILE"); 1363 _exit(1); 1364 } 1365 (void)fcntl(0, F_SETFD, 0); 1366 (void)lseek(0, (off_t)0, SEEK_SET); 1367 1368 /* 1369 * Always pass job token pipe to submakes. In the previous version 1370 * only the OP_MAKE flag was checked, which simply doesn't catch all 1371 * situtions and can lead to a massive multiplication of jobs. This 1372 * may have been corrected with OR OP_SUBMAKE, but until this is 1373 * known for sure, keep the original modication in place 1374 * 1375 * if (job->node->type & (OP_MAKE | OP_SUBMAKE)) 1376 */ 1377 { 1378 /* 1379 * Pass job token pipe to submakes. 1380 */ 1381 fcntl(tokenWaitJob.inPipe, F_SETFD, 0); 1382 fcntl(tokenWaitJob.outPipe, F_SETFD, 0); 1383 } 1384 1385 /* 1386 * Set up the child's output to be routed through the pipe 1387 * we've created for it. 1388 */ 1389 if (dup2(job->outPipe, 1) == -1) { 1390 execError("dup2", "job->outPipe"); 1391 _exit(1); 1392 } 1393 /* 1394 * The output channels are marked close on exec. This bit was 1395 * duplicated by the dup2(on some systems), so we have to clear 1396 * it before routing the shell's error output to the same place as 1397 * its standard output. 1398 */ 1399 (void)fcntl(1, F_SETFD, 0); 1400 if (dup2(1, 2) == -1) { 1401 execError("dup2", "1, 2"); 1402 _exit(1); 1403 } 1404 1405 /* 1406 * We want to switch the child into a different process family so 1407 * we can kill it and all its descendants in one fell swoop, 1408 * by killing its process family, but not commit suicide. 1409 */ 1410 #if defined(HAVE_SETPGID) 1411 (void)setpgid(0, getpid()); 1412 #else 1413 #if defined(HAVE_SETSID) 1414 /* XXX: dsl - I'm sure this should be setpgrp()... */ 1415 (void)setsid(); 1416 #else 1417 (void)setpgrp(0, getpid()); 1418 #endif 1419 #endif 1420 1421 Var_ExportVars(); 1422 1423 (void)execv(shellPath, argv); 1424 execError("exec", shellPath); 1425 _exit(1); 1426 } 1427 1428 /* Parent, continuing after the child exec */ 1429 job->pid = cpid; 1430 1431 Trace_Log(JOBSTART, job); 1432 1433 /* 1434 * Set the current position in the buffer to the beginning 1435 * and mark another stream to watch in the outputs mask 1436 */ 1437 job->curPos = 0; 1438 1439 watchfd(job); 1440 1441 if (job->cmdFILE != NULL && job->cmdFILE != stdout) { 1442 (void)fclose(job->cmdFILE); 1443 job->cmdFILE = NULL; 1444 } 1445 1446 /* 1447 * Now the job is actually running, add it to the table. 1448 */ 1449 if (DEBUG(JOB)) { 1450 fprintf(debug_file, "JobExec(%s): pid %d added to jobs table\n", 1451 job->node->name, job->pid); 1452 job_table_dump("job started"); 1453 } 1454 JobSigUnlock(&mask); 1455 } 1456 1457 /*- 1458 *----------------------------------------------------------------------- 1459 * JobMakeArgv -- 1460 * Create the argv needed to execute the shell for a given job. 1461 * 1462 * 1463 * Results: 1464 * 1465 * Side Effects: 1466 * 1467 *----------------------------------------------------------------------- 1468 */ 1469 static void 1470 JobMakeArgv(Job *job, char **argv) 1471 { 1472 int argc; 1473 static char args[10]; /* For merged arguments */ 1474 1475 argv[0] = UNCONST(shellName); 1476 argc = 1; 1477 1478 if ((commandShell->exit && (*commandShell->exit != '-')) || 1479 (commandShell->echo && (*commandShell->echo != '-'))) 1480 { 1481 /* 1482 * At least one of the flags doesn't have a minus before it, so 1483 * merge them together. Have to do this because the *(&(@*#*&#$# 1484 * Bourne shell thinks its second argument is a file to source. 1485 * Grrrr. Note the ten-character limitation on the combined arguments. 1486 */ 1487 (void)snprintf(args, sizeof(args), "-%s%s", 1488 ((job->flags & JOB_IGNERR) ? "" : 1489 (commandShell->exit ? commandShell->exit : "")), 1490 ((job->flags & JOB_SILENT) ? "" : 1491 (commandShell->echo ? commandShell->echo : ""))); 1492 1493 if (args[1]) { 1494 argv[argc] = args; 1495 argc++; 1496 } 1497 } else { 1498 if (!(job->flags & JOB_IGNERR) && commandShell->exit) { 1499 argv[argc] = UNCONST(commandShell->exit); 1500 argc++; 1501 } 1502 if (!(job->flags & JOB_SILENT) && commandShell->echo) { 1503 argv[argc] = UNCONST(commandShell->echo); 1504 argc++; 1505 } 1506 } 1507 argv[argc] = NULL; 1508 } 1509 1510 /*- 1511 *----------------------------------------------------------------------- 1512 * JobStart -- 1513 * Start a target-creation process going for the target described 1514 * by the graph node gn. 1515 * 1516 * Input: 1517 * gn target to create 1518 * flags flags for the job to override normal ones. 1519 * e.g. JOB_SPECIAL or JOB_IGNDOTS 1520 * previous The previous Job structure for this node, if any. 1521 * 1522 * Results: 1523 * JOB_ERROR if there was an error in the commands, JOB_FINISHED 1524 * if there isn't actually anything left to do for the job and 1525 * JOB_RUNNING if the job has been started. 1526 * 1527 * Side Effects: 1528 * A new Job node is created and added to the list of running 1529 * jobs. PMake is forked and a child shell created. 1530 * 1531 * NB: I'm fairly sure that this code is never called with JOB_SPECIAL set 1532 * JOB_IGNDOTS is never set (dsl) 1533 * Also the return value is ignored by everyone. 1534 *----------------------------------------------------------------------- 1535 */ 1536 static int 1537 JobStart(GNode *gn, int flags) 1538 { 1539 Job *job; /* new job descriptor */ 1540 char *argv[10]; /* Argument vector to shell */ 1541 Boolean cmdsOK; /* true if the nodes commands were all right */ 1542 Boolean noExec; /* Set true if we decide not to run the job */ 1543 int tfd; /* File descriptor to the temp file */ 1544 1545 for (job = job_table; job < job_table_end; job++) { 1546 if (job->job_state == JOB_ST_FREE) 1547 break; 1548 } 1549 if (job >= job_table_end) 1550 Punt("JobStart no job slots vacant"); 1551 1552 memset(job, 0, sizeof *job); 1553 job->job_state = JOB_ST_SETUP; 1554 if (gn->type & OP_SPECIAL) 1555 flags |= JOB_SPECIAL; 1556 1557 job->node = gn; 1558 job->tailCmds = NULL; 1559 1560 /* 1561 * Set the initial value of the flags for this job based on the global 1562 * ones and the node's attributes... Any flags supplied by the caller 1563 * are also added to the field. 1564 */ 1565 job->flags = 0; 1566 if (Targ_Ignore(gn)) { 1567 job->flags |= JOB_IGNERR; 1568 } 1569 if (Targ_Silent(gn)) { 1570 job->flags |= JOB_SILENT; 1571 } 1572 job->flags |= flags; 1573 1574 /* 1575 * Check the commands now so any attributes from .DEFAULT have a chance 1576 * to migrate to the node 1577 */ 1578 cmdsOK = Job_CheckCommands(gn, Error); 1579 1580 job->inPollfd = NULL; 1581 /* 1582 * If the -n flag wasn't given, we open up OUR (not the child's) 1583 * temporary file to stuff commands in it. The thing is rd/wr so we don't 1584 * need to reopen it to feed it to the shell. If the -n flag *was* given, 1585 * we just set the file to be stdout. Cute, huh? 1586 */ 1587 if (((gn->type & OP_MAKE) && !(noRecursiveExecute)) || 1588 (!noExecute && !touchFlag)) { 1589 /* 1590 * tfile is the name of a file into which all shell commands are 1591 * put. It is removed before the child shell is executed, unless 1592 * DEBUG(SCRIPT) is set. 1593 */ 1594 char *tfile; 1595 sigset_t mask; 1596 /* 1597 * We're serious here, but if the commands were bogus, we're 1598 * also dead... 1599 */ 1600 if (!cmdsOK) { 1601 PrintOnError(gn, NULL); /* provide some clue */ 1602 DieHorribly(); 1603 } 1604 1605 JobSigLock(&mask); 1606 tfd = mkTempFile(TMPPAT, &tfile); 1607 if (!DEBUG(SCRIPT)) 1608 (void)eunlink(tfile); 1609 JobSigUnlock(&mask); 1610 1611 job->cmdFILE = fdopen(tfd, "w+"); 1612 if (job->cmdFILE == NULL) { 1613 Punt("Could not fdopen %s", tfile); 1614 } 1615 (void)fcntl(FILENO(job->cmdFILE), F_SETFD, FD_CLOEXEC); 1616 /* 1617 * Send the commands to the command file, flush all its buffers then 1618 * rewind and remove the thing. 1619 */ 1620 noExec = FALSE; 1621 1622 #ifdef USE_META 1623 if (useMeta) { 1624 meta_job_start(job, gn); 1625 if (Targ_Silent(gn)) { /* might have changed */ 1626 job->flags |= JOB_SILENT; 1627 } 1628 } 1629 #endif 1630 /* 1631 * We can do all the commands at once. hooray for sanity 1632 */ 1633 numCommands = 0; 1634 Lst_ForEach(gn->commands, JobPrintCommand, job); 1635 1636 /* 1637 * If we didn't print out any commands to the shell script, 1638 * there's not much point in executing the shell, is there? 1639 */ 1640 if (numCommands == 0) { 1641 noExec = TRUE; 1642 } 1643 1644 free(tfile); 1645 } else if (NoExecute(gn)) { 1646 /* 1647 * Not executing anything -- just print all the commands to stdout 1648 * in one fell swoop. This will still set up job->tailCmds correctly. 1649 */ 1650 if (lastNode != gn) { 1651 MESSAGE(stdout, gn); 1652 lastNode = gn; 1653 } 1654 job->cmdFILE = stdout; 1655 /* 1656 * Only print the commands if they're ok, but don't die if they're 1657 * not -- just let the user know they're bad and keep going. It 1658 * doesn't do any harm in this case and may do some good. 1659 */ 1660 if (cmdsOK) { 1661 Lst_ForEach(gn->commands, JobPrintCommand, job); 1662 } 1663 /* 1664 * Don't execute the shell, thank you. 1665 */ 1666 noExec = TRUE; 1667 } else { 1668 /* 1669 * Just touch the target and note that no shell should be executed. 1670 * Set cmdFILE to stdout to make life easier. Check the commands, too, 1671 * but don't die if they're no good -- it does no harm to keep working 1672 * up the graph. 1673 */ 1674 job->cmdFILE = stdout; 1675 Job_Touch(gn, job->flags&JOB_SILENT); 1676 noExec = TRUE; 1677 } 1678 /* Just in case it isn't already... */ 1679 (void)fflush(job->cmdFILE); 1680 1681 /* 1682 * If we're not supposed to execute a shell, don't. 1683 */ 1684 if (noExec) { 1685 if (!(job->flags & JOB_SPECIAL)) 1686 Job_TokenReturn(); 1687 /* 1688 * Unlink and close the command file if we opened one 1689 */ 1690 if (job->cmdFILE != stdout) { 1691 if (job->cmdFILE != NULL) { 1692 (void)fclose(job->cmdFILE); 1693 job->cmdFILE = NULL; 1694 } 1695 } 1696 1697 /* 1698 * We only want to work our way up the graph if we aren't here because 1699 * the commands for the job were no good. 1700 */ 1701 if (cmdsOK && aborting == 0) { 1702 if (job->tailCmds != NULL) { 1703 Lst_ForEachFrom(job->node->commands, job->tailCmds, 1704 JobSaveCommand, 1705 job->node); 1706 } 1707 job->node->made = MADE; 1708 Make_Update(job->node); 1709 } 1710 job->job_state = JOB_ST_FREE; 1711 return cmdsOK ? JOB_FINISHED : JOB_ERROR; 1712 } 1713 1714 /* 1715 * Set up the control arguments to the shell. This is based on the flags 1716 * set earlier for this job. 1717 */ 1718 JobMakeArgv(job, argv); 1719 1720 /* Create the pipe by which we'll get the shell's output. */ 1721 JobCreatePipe(job, 3); 1722 1723 JobExec(job, argv); 1724 return(JOB_RUNNING); 1725 } 1726 1727 static char * 1728 JobOutput(Job *job, char *cp, char *endp, int msg) 1729 { 1730 char *ecp; 1731 1732 if (commandShell->noPrint) { 1733 ecp = Str_FindSubstring(cp, commandShell->noPrint); 1734 while (ecp != NULL) { 1735 if (cp != ecp) { 1736 *ecp = '\0'; 1737 if (!beSilent && msg && job->node != lastNode) { 1738 MESSAGE(stdout, job->node); 1739 lastNode = job->node; 1740 } 1741 /* 1742 * The only way there wouldn't be a newline after 1743 * this line is if it were the last in the buffer. 1744 * however, since the non-printable comes after it, 1745 * there must be a newline, so we don't print one. 1746 */ 1747 (void)fprintf(stdout, "%s", cp); 1748 (void)fflush(stdout); 1749 } 1750 cp = ecp + commandShell->noPLen; 1751 if (cp != endp) { 1752 /* 1753 * Still more to print, look again after skipping 1754 * the whitespace following the non-printable 1755 * command.... 1756 */ 1757 cp++; 1758 while (*cp == ' ' || *cp == '\t' || *cp == '\n') { 1759 cp++; 1760 } 1761 ecp = Str_FindSubstring(cp, commandShell->noPrint); 1762 } else { 1763 return cp; 1764 } 1765 } 1766 } 1767 return cp; 1768 } 1769 1770 /*- 1771 *----------------------------------------------------------------------- 1772 * JobDoOutput -- 1773 * This function is called at different times depending on 1774 * whether the user has specified that output is to be collected 1775 * via pipes or temporary files. In the former case, we are called 1776 * whenever there is something to read on the pipe. We collect more 1777 * output from the given job and store it in the job's outBuf. If 1778 * this makes up a line, we print it tagged by the job's identifier, 1779 * as necessary. 1780 * If output has been collected in a temporary file, we open the 1781 * file and read it line by line, transfering it to our own 1782 * output channel until the file is empty. At which point we 1783 * remove the temporary file. 1784 * In both cases, however, we keep our figurative eye out for the 1785 * 'noPrint' line for the shell from which the output came. If 1786 * we recognize a line, we don't print it. If the command is not 1787 * alone on the line (the character after it is not \0 or \n), we 1788 * do print whatever follows it. 1789 * 1790 * Input: 1791 * job the job whose output needs printing 1792 * finish TRUE if this is the last time we'll be called 1793 * for this job 1794 * 1795 * Results: 1796 * None 1797 * 1798 * Side Effects: 1799 * curPos may be shifted as may the contents of outBuf. 1800 *----------------------------------------------------------------------- 1801 */ 1802 STATIC void 1803 JobDoOutput(Job *job, Boolean finish) 1804 { 1805 Boolean gotNL = FALSE; /* true if got a newline */ 1806 Boolean fbuf; /* true if our buffer filled up */ 1807 int nr; /* number of bytes read */ 1808 int i; /* auxiliary index into outBuf */ 1809 int max; /* limit for i (end of current data) */ 1810 int nRead; /* (Temporary) number of bytes read */ 1811 1812 /* 1813 * Read as many bytes as will fit in the buffer. 1814 */ 1815 end_loop: 1816 gotNL = FALSE; 1817 fbuf = FALSE; 1818 1819 nRead = read(job->inPipe, &job->outBuf[job->curPos], 1820 JOB_BUFSIZE - job->curPos); 1821 if (nRead < 0) { 1822 if (errno == EAGAIN) 1823 return; 1824 if (DEBUG(JOB)) { 1825 perror("JobDoOutput(piperead)"); 1826 } 1827 nr = 0; 1828 } else { 1829 nr = nRead; 1830 } 1831 1832 /* 1833 * If we hit the end-of-file (the job is dead), we must flush its 1834 * remaining output, so pretend we read a newline if there's any 1835 * output remaining in the buffer. 1836 * Also clear the 'finish' flag so we stop looping. 1837 */ 1838 if ((nr == 0) && (job->curPos != 0)) { 1839 job->outBuf[job->curPos] = '\n'; 1840 nr = 1; 1841 finish = FALSE; 1842 } else if (nr == 0) { 1843 finish = FALSE; 1844 } 1845 1846 /* 1847 * Look for the last newline in the bytes we just got. If there is 1848 * one, break out of the loop with 'i' as its index and gotNL set 1849 * TRUE. 1850 */ 1851 max = job->curPos + nr; 1852 for (i = job->curPos + nr - 1; i >= job->curPos; i--) { 1853 if (job->outBuf[i] == '\n') { 1854 gotNL = TRUE; 1855 break; 1856 } else if (job->outBuf[i] == '\0') { 1857 /* 1858 * Why? 1859 */ 1860 job->outBuf[i] = ' '; 1861 } 1862 } 1863 1864 if (!gotNL) { 1865 job->curPos += nr; 1866 if (job->curPos == JOB_BUFSIZE) { 1867 /* 1868 * If we've run out of buffer space, we have no choice 1869 * but to print the stuff. sigh. 1870 */ 1871 fbuf = TRUE; 1872 i = job->curPos; 1873 } 1874 } 1875 if (gotNL || fbuf) { 1876 /* 1877 * Need to send the output to the screen. Null terminate it 1878 * first, overwriting the newline character if there was one. 1879 * So long as the line isn't one we should filter (according 1880 * to the shell description), we print the line, preceded 1881 * by a target banner if this target isn't the same as the 1882 * one for which we last printed something. 1883 * The rest of the data in the buffer are then shifted down 1884 * to the start of the buffer and curPos is set accordingly. 1885 */ 1886 job->outBuf[i] = '\0'; 1887 if (i >= job->curPos) { 1888 char *cp; 1889 1890 cp = JobOutput(job, job->outBuf, &job->outBuf[i], FALSE); 1891 1892 /* 1893 * There's still more in that thar buffer. This time, though, 1894 * we know there's no newline at the end, so we add one of 1895 * our own free will. 1896 */ 1897 if (*cp != '\0') { 1898 if (!beSilent && job->node != lastNode) { 1899 MESSAGE(stdout, job->node); 1900 lastNode = job->node; 1901 } 1902 #ifdef USE_META 1903 if (useMeta) { 1904 meta_job_output(job, cp, gotNL ? "\n" : ""); 1905 } 1906 #endif 1907 (void)fprintf(stdout, "%s%s", cp, gotNL ? "\n" : ""); 1908 (void)fflush(stdout); 1909 } 1910 } 1911 /* 1912 * max is the last offset still in the buffer. Move any remaining 1913 * characters to the start of the buffer and update the end marker 1914 * curPos. 1915 */ 1916 if (i < max) { 1917 (void)memmove(job->outBuf, &job->outBuf[i + 1], max - (i + 1)); 1918 job->curPos = max - (i + 1); 1919 } else { 1920 assert(i == max); 1921 job->curPos = 0; 1922 } 1923 } 1924 if (finish) { 1925 /* 1926 * If the finish flag is true, we must loop until we hit 1927 * end-of-file on the pipe. This is guaranteed to happen 1928 * eventually since the other end of the pipe is now closed 1929 * (we closed it explicitly and the child has exited). When 1930 * we do get an EOF, finish will be set FALSE and we'll fall 1931 * through and out. 1932 */ 1933 goto end_loop; 1934 } 1935 } 1936 1937 static void 1938 JobRun(GNode *targ) 1939 { 1940 #ifdef notyet 1941 /* 1942 * Unfortunately it is too complicated to run .BEGIN, .END, 1943 * and .INTERRUPT job in the parallel job module. This has 1944 * the nice side effect that it avoids a lot of other problems. 1945 */ 1946 Lst lst = Lst_Init(FALSE); 1947 Lst_AtEnd(lst, targ); 1948 (void)Make_Run(lst); 1949 Lst_Destroy(lst, NULL); 1950 JobStart(targ, JOB_SPECIAL); 1951 while (jobTokensRunning) { 1952 Job_CatchOutput(); 1953 } 1954 #else 1955 Compat_Make(targ, targ); 1956 if (targ->made == ERROR) { 1957 PrintOnError(targ, "\n\nStop."); 1958 exit(1); 1959 } 1960 #endif 1961 } 1962 1963 /*- 1964 *----------------------------------------------------------------------- 1965 * Job_CatchChildren -- 1966 * Handle the exit of a child. Called from Make_Make. 1967 * 1968 * Input: 1969 * block TRUE if should block on the wait 1970 * 1971 * Results: 1972 * none. 1973 * 1974 * Side Effects: 1975 * The job descriptor is removed from the list of children. 1976 * 1977 * Notes: 1978 * We do waits, blocking or not, according to the wisdom of our 1979 * caller, until there are no more children to report. For each 1980 * job, call JobFinish to finish things off. 1981 * 1982 *----------------------------------------------------------------------- 1983 */ 1984 1985 void 1986 Job_CatchChildren(void) 1987 { 1988 int pid; /* pid of dead child */ 1989 WAIT_T status; /* Exit/termination status */ 1990 1991 /* 1992 * Don't even bother if we know there's no one around. 1993 */ 1994 if (jobTokensRunning == 0) 1995 return; 1996 1997 while ((pid = waitpid((pid_t) -1, &status, WNOHANG | WUNTRACED)) > 0) { 1998 if (DEBUG(JOB)) { 1999 (void)fprintf(debug_file, "Process %d exited/stopped status %x.\n", pid, 2000 WAIT_STATUS(status)); 2001 } 2002 JobReapChild(pid, status, TRUE); 2003 } 2004 } 2005 2006 /* 2007 * It is possible that wait[pid]() was called from elsewhere, 2008 * this lets us reap jobs regardless. 2009 */ 2010 void 2011 JobReapChild(pid_t pid, WAIT_T status, Boolean isJobs) 2012 { 2013 Job *job; /* job descriptor for dead child */ 2014 2015 /* 2016 * Don't even bother if we know there's no one around. 2017 */ 2018 if (jobTokensRunning == 0) 2019 return; 2020 2021 job = JobFindPid(pid, JOB_ST_RUNNING, isJobs); 2022 if (job == NULL) { 2023 if (isJobs) { 2024 if (!lurking_children) 2025 Error("Child (%d) status %x not in table?", pid, status); 2026 } 2027 return; /* not ours */ 2028 } 2029 if (WIFSTOPPED(status)) { 2030 if (DEBUG(JOB)) { 2031 (void)fprintf(debug_file, "Process %d (%s) stopped.\n", 2032 job->pid, job->node->name); 2033 } 2034 if (!make_suspended) { 2035 switch (WSTOPSIG(status)) { 2036 case SIGTSTP: 2037 (void)printf("*** [%s] Suspended\n", job->node->name); 2038 break; 2039 case SIGSTOP: 2040 (void)printf("*** [%s] Stopped\n", job->node->name); 2041 break; 2042 default: 2043 (void)printf("*** [%s] Stopped -- signal %d\n", 2044 job->node->name, WSTOPSIG(status)); 2045 } 2046 job->job_suspended = 1; 2047 } 2048 (void)fflush(stdout); 2049 return; 2050 } 2051 2052 job->job_state = JOB_ST_FINISHED; 2053 job->exit_status = WAIT_STATUS(status); 2054 2055 JobFinish(job, status); 2056 } 2057 2058 /*- 2059 *----------------------------------------------------------------------- 2060 * Job_CatchOutput -- 2061 * Catch the output from our children, if we're using 2062 * pipes do so. Otherwise just block time until we get a 2063 * signal(most likely a SIGCHLD) since there's no point in 2064 * just spinning when there's nothing to do and the reaping 2065 * of a child can wait for a while. 2066 * 2067 * Results: 2068 * None 2069 * 2070 * Side Effects: 2071 * Output is read from pipes if we're piping. 2072 * ----------------------------------------------------------------------- 2073 */ 2074 void 2075 Job_CatchOutput(void) 2076 { 2077 int nready; 2078 Job *job; 2079 int i; 2080 2081 (void)fflush(stdout); 2082 2083 /* The first fd in the list is the job token pipe */ 2084 do { 2085 nready = poll(fds + 1 - wantToken, nfds - 1 + wantToken, POLL_MSEC); 2086 } while (nready < 0 && errno == EINTR); 2087 2088 if (nready < 0) 2089 Punt("poll: %s", strerror(errno)); 2090 2091 if (nready > 0 && readyfd(&childExitJob)) { 2092 char token = 0; 2093 ssize_t count; 2094 count = read(childExitJob.inPipe, &token, 1); 2095 switch (count) { 2096 case 0: 2097 Punt("unexpected eof on token pipe"); 2098 case -1: 2099 Punt("token pipe read: %s", strerror(errno)); 2100 case 1: 2101 if (token == DO_JOB_RESUME[0]) 2102 /* Complete relay requested from our SIGCONT handler */ 2103 JobRestartJobs(); 2104 break; 2105 default: 2106 abort(); 2107 } 2108 --nready; 2109 } 2110 2111 Job_CatchChildren(); 2112 if (nready == 0) 2113 return; 2114 2115 for (i = 2; i < nfds; i++) { 2116 if (!fds[i].revents) 2117 continue; 2118 job = jobfds[i]; 2119 if (job->job_state == JOB_ST_RUNNING) 2120 JobDoOutput(job, FALSE); 2121 if (--nready == 0) 2122 return; 2123 } 2124 } 2125 2126 /*- 2127 *----------------------------------------------------------------------- 2128 * Job_Make -- 2129 * Start the creation of a target. Basically a front-end for 2130 * JobStart used by the Make module. 2131 * 2132 * Results: 2133 * None. 2134 * 2135 * Side Effects: 2136 * Another job is started. 2137 * 2138 *----------------------------------------------------------------------- 2139 */ 2140 void 2141 Job_Make(GNode *gn) 2142 { 2143 (void)JobStart(gn, 0); 2144 } 2145 2146 void 2147 Shell_Init(void) 2148 { 2149 if (shellPath == NULL) { 2150 /* 2151 * We are using the default shell, which may be an absolute 2152 * path if DEFSHELL_CUSTOM is defined. 2153 */ 2154 shellName = commandShell->name; 2155 #ifdef DEFSHELL_CUSTOM 2156 if (*shellName == '/') { 2157 shellPath = shellName; 2158 shellName = strrchr(shellPath, '/'); 2159 shellName++; 2160 } else 2161 #endif 2162 shellPath = str_concat(_PATH_DEFSHELLDIR, shellName, STR_ADDSLASH); 2163 } 2164 if (commandShell->exit == NULL) { 2165 commandShell->exit = ""; 2166 } 2167 if (commandShell->echo == NULL) { 2168 commandShell->echo = ""; 2169 } 2170 if (commandShell->hasErrCtl && *commandShell->exit) { 2171 if (shellErrFlag && 2172 strcmp(commandShell->exit, &shellErrFlag[1]) != 0) { 2173 free(shellErrFlag); 2174 shellErrFlag = NULL; 2175 } 2176 if (!shellErrFlag) { 2177 int n = strlen(commandShell->exit) + 2; 2178 2179 shellErrFlag = bmake_malloc(n); 2180 if (shellErrFlag) { 2181 snprintf(shellErrFlag, n, "-%s", commandShell->exit); 2182 } 2183 } 2184 } else if (shellErrFlag) { 2185 free(shellErrFlag); 2186 shellErrFlag = NULL; 2187 } 2188 } 2189 2190 /*- 2191 * Returns the string literal that is used in the current command shell 2192 * to produce a newline character. 2193 */ 2194 const char * 2195 Shell_GetNewline(void) 2196 { 2197 2198 return commandShell->newline; 2199 } 2200 2201 void 2202 Job_SetPrefix(void) 2203 { 2204 2205 if (targPrefix) { 2206 free(targPrefix); 2207 } else if (!Var_Exists(MAKE_JOB_PREFIX, VAR_GLOBAL)) { 2208 Var_Set(MAKE_JOB_PREFIX, "---", VAR_GLOBAL, 0); 2209 } 2210 2211 targPrefix = Var_Subst(NULL, "${" MAKE_JOB_PREFIX "}", 2212 VAR_GLOBAL, VARF_WANTRES); 2213 } 2214 2215 /*- 2216 *----------------------------------------------------------------------- 2217 * Job_Init -- 2218 * Initialize the process module 2219 * 2220 * Input: 2221 * 2222 * Results: 2223 * none 2224 * 2225 * Side Effects: 2226 * lists and counters are initialized 2227 *----------------------------------------------------------------------- 2228 */ 2229 void 2230 Job_Init(void) 2231 { 2232 Job_SetPrefix(); 2233 /* Allocate space for all the job info */ 2234 job_table = bmake_malloc(maxJobs * sizeof *job_table); 2235 memset(job_table, 0, maxJobs * sizeof *job_table); 2236 job_table_end = job_table + maxJobs; 2237 wantToken = 0; 2238 2239 aborting = 0; 2240 errors = 0; 2241 2242 lastNode = NULL; 2243 2244 /* 2245 * There is a non-zero chance that we already have children. 2246 * eg after 'make -f- <<EOF' 2247 * Since their termination causes a 'Child (pid) not in table' message, 2248 * Collect the status of any that are already dead, and suppress the 2249 * error message if there are any undead ones. 2250 */ 2251 for (;;) { 2252 int rval, status; 2253 rval = waitpid((pid_t) -1, &status, WNOHANG); 2254 if (rval > 0) 2255 continue; 2256 if (rval == 0) 2257 lurking_children = 1; 2258 break; 2259 } 2260 2261 Shell_Init(); 2262 2263 JobCreatePipe(&childExitJob, 3); 2264 2265 /* We can only need to wait for tokens, children and output from each job */ 2266 fds = bmake_malloc(sizeof (*fds) * (2 + maxJobs)); 2267 jobfds = bmake_malloc(sizeof (*jobfds) * (2 + maxJobs)); 2268 2269 /* These are permanent entries and take slots 0 and 1 */ 2270 watchfd(&tokenWaitJob); 2271 watchfd(&childExitJob); 2272 2273 sigemptyset(&caught_signals); 2274 /* 2275 * Install a SIGCHLD handler. 2276 */ 2277 (void)bmake_signal(SIGCHLD, JobChildSig); 2278 sigaddset(&caught_signals, SIGCHLD); 2279 2280 #define ADDSIG(s,h) \ 2281 if (bmake_signal(s, SIG_IGN) != SIG_IGN) { \ 2282 sigaddset(&caught_signals, s); \ 2283 (void)bmake_signal(s, h); \ 2284 } 2285 2286 /* 2287 * Catch the four signals that POSIX specifies if they aren't ignored. 2288 * JobPassSig will take care of calling JobInterrupt if appropriate. 2289 */ 2290 ADDSIG(SIGINT, JobPassSig_int) 2291 ADDSIG(SIGHUP, JobPassSig_term) 2292 ADDSIG(SIGTERM, JobPassSig_term) 2293 ADDSIG(SIGQUIT, JobPassSig_term) 2294 2295 /* 2296 * There are additional signals that need to be caught and passed if 2297 * either the export system wants to be told directly of signals or if 2298 * we're giving each job its own process group (since then it won't get 2299 * signals from the terminal driver as we own the terminal) 2300 */ 2301 ADDSIG(SIGTSTP, JobPassSig_suspend) 2302 ADDSIG(SIGTTOU, JobPassSig_suspend) 2303 ADDSIG(SIGTTIN, JobPassSig_suspend) 2304 ADDSIG(SIGWINCH, JobCondPassSig) 2305 ADDSIG(SIGCONT, JobContinueSig) 2306 #undef ADDSIG 2307 2308 (void)Job_RunTarget(".BEGIN", NULL); 2309 postCommands = Targ_FindNode(".END", TARG_CREATE); 2310 } 2311 2312 static void JobSigReset(void) 2313 { 2314 #define DELSIG(s) \ 2315 if (sigismember(&caught_signals, s)) { \ 2316 (void)bmake_signal(s, SIG_DFL); \ 2317 } 2318 2319 DELSIG(SIGINT) 2320 DELSIG(SIGHUP) 2321 DELSIG(SIGQUIT) 2322 DELSIG(SIGTERM) 2323 DELSIG(SIGTSTP) 2324 DELSIG(SIGTTOU) 2325 DELSIG(SIGTTIN) 2326 DELSIG(SIGWINCH) 2327 DELSIG(SIGCONT) 2328 #undef DELSIG 2329 (void)bmake_signal(SIGCHLD, SIG_DFL); 2330 } 2331 2332 /*- 2333 *----------------------------------------------------------------------- 2334 * JobMatchShell -- 2335 * Find a shell in 'shells' given its name. 2336 * 2337 * Results: 2338 * A pointer to the Shell structure. 2339 * 2340 * Side Effects: 2341 * None. 2342 * 2343 *----------------------------------------------------------------------- 2344 */ 2345 static Shell * 2346 JobMatchShell(const char *name) 2347 { 2348 Shell *sh; 2349 2350 for (sh = shells; sh->name != NULL; sh++) { 2351 if (strcmp(name, sh->name) == 0) 2352 return (sh); 2353 } 2354 return NULL; 2355 } 2356 2357 /*- 2358 *----------------------------------------------------------------------- 2359 * Job_ParseShell -- 2360 * Parse a shell specification and set up commandShell, shellPath 2361 * and shellName appropriately. 2362 * 2363 * Input: 2364 * line The shell spec 2365 * 2366 * Results: 2367 * FAILURE if the specification was incorrect. 2368 * 2369 * Side Effects: 2370 * commandShell points to a Shell structure (either predefined or 2371 * created from the shell spec), shellPath is the full path of the 2372 * shell described by commandShell, while shellName is just the 2373 * final component of shellPath. 2374 * 2375 * Notes: 2376 * A shell specification consists of a .SHELL target, with dependency 2377 * operator, followed by a series of blank-separated words. Double 2378 * quotes can be used to use blanks in words. A backslash escapes 2379 * anything (most notably a double-quote and a space) and 2380 * provides the functionality it does in C. Each word consists of 2381 * keyword and value separated by an equal sign. There should be no 2382 * unnecessary spaces in the word. The keywords are as follows: 2383 * name Name of shell. 2384 * path Location of shell. 2385 * quiet Command to turn off echoing. 2386 * echo Command to turn echoing on 2387 * filter Result of turning off echoing that shouldn't be 2388 * printed. 2389 * echoFlag Flag to turn echoing on at the start 2390 * errFlag Flag to turn error checking on at the start 2391 * hasErrCtl True if shell has error checking control 2392 * newline String literal to represent a newline char 2393 * check Command to turn on error checking if hasErrCtl 2394 * is TRUE or template of command to echo a command 2395 * for which error checking is off if hasErrCtl is 2396 * FALSE. 2397 * ignore Command to turn off error checking if hasErrCtl 2398 * is TRUE or template of command to execute a 2399 * command so as to ignore any errors it returns if 2400 * hasErrCtl is FALSE. 2401 * 2402 *----------------------------------------------------------------------- 2403 */ 2404 ReturnStatus 2405 Job_ParseShell(char *line) 2406 { 2407 char **words; 2408 char **argv; 2409 int argc; 2410 char *path; 2411 Shell newShell; 2412 Boolean fullSpec = FALSE; 2413 Shell *sh; 2414 2415 while (isspace((unsigned char)*line)) { 2416 line++; 2417 } 2418 2419 free(UNCONST(shellArgv)); 2420 2421 memset(&newShell, 0, sizeof(newShell)); 2422 2423 /* 2424 * Parse the specification by keyword 2425 */ 2426 words = brk_string(line, &argc, TRUE, &path); 2427 if (words == NULL) { 2428 Error("Unterminated quoted string [%s]", line); 2429 return FAILURE; 2430 } 2431 shellArgv = path; 2432 2433 for (path = NULL, argv = words; argc != 0; argc--, argv++) { 2434 if (strncmp(*argv, "path=", 5) == 0) { 2435 path = &argv[0][5]; 2436 } else if (strncmp(*argv, "name=", 5) == 0) { 2437 newShell.name = &argv[0][5]; 2438 } else { 2439 if (strncmp(*argv, "quiet=", 6) == 0) { 2440 newShell.echoOff = &argv[0][6]; 2441 } else if (strncmp(*argv, "echo=", 5) == 0) { 2442 newShell.echoOn = &argv[0][5]; 2443 } else if (strncmp(*argv, "filter=", 7) == 0) { 2444 newShell.noPrint = &argv[0][7]; 2445 newShell.noPLen = strlen(newShell.noPrint); 2446 } else if (strncmp(*argv, "echoFlag=", 9) == 0) { 2447 newShell.echo = &argv[0][9]; 2448 } else if (strncmp(*argv, "errFlag=", 8) == 0) { 2449 newShell.exit = &argv[0][8]; 2450 } else if (strncmp(*argv, "hasErrCtl=", 10) == 0) { 2451 char c = argv[0][10]; 2452 newShell.hasErrCtl = !((c != 'Y') && (c != 'y') && 2453 (c != 'T') && (c != 't')); 2454 } else if (strncmp(*argv, "newline=", 8) == 0) { 2455 newShell.newline = &argv[0][8]; 2456 } else if (strncmp(*argv, "check=", 6) == 0) { 2457 newShell.errCheck = &argv[0][6]; 2458 } else if (strncmp(*argv, "ignore=", 7) == 0) { 2459 newShell.ignErr = &argv[0][7]; 2460 } else if (strncmp(*argv, "errout=", 7) == 0) { 2461 newShell.errOut = &argv[0][7]; 2462 } else if (strncmp(*argv, "comment=", 8) == 0) { 2463 newShell.commentChar = argv[0][8]; 2464 } else { 2465 Parse_Error(PARSE_FATAL, "Unknown keyword \"%s\"", 2466 *argv); 2467 free(words); 2468 return(FAILURE); 2469 } 2470 fullSpec = TRUE; 2471 } 2472 } 2473 2474 if (path == NULL) { 2475 /* 2476 * If no path was given, the user wants one of the pre-defined shells, 2477 * yes? So we find the one s/he wants with the help of JobMatchShell 2478 * and set things up the right way. shellPath will be set up by 2479 * Shell_Init. 2480 */ 2481 if (newShell.name == NULL) { 2482 Parse_Error(PARSE_FATAL, "Neither path nor name specified"); 2483 free(words); 2484 return(FAILURE); 2485 } else { 2486 if ((sh = JobMatchShell(newShell.name)) == NULL) { 2487 Parse_Error(PARSE_WARNING, "%s: No matching shell", 2488 newShell.name); 2489 free(words); 2490 return(FAILURE); 2491 } 2492 commandShell = sh; 2493 shellName = newShell.name; 2494 if (shellPath) { 2495 /* Shell_Init has already been called! Do it again. */ 2496 free(UNCONST(shellPath)); 2497 shellPath = NULL; 2498 Shell_Init(); 2499 } 2500 } 2501 } else { 2502 /* 2503 * The user provided a path. If s/he gave nothing else (fullSpec is 2504 * FALSE), try and find a matching shell in the ones we know of. 2505 * Else we just take the specification at its word and copy it 2506 * to a new location. In either case, we need to record the 2507 * path the user gave for the shell. 2508 */ 2509 shellPath = path; 2510 path = strrchr(path, '/'); 2511 if (path == NULL) { 2512 path = UNCONST(shellPath); 2513 } else { 2514 path += 1; 2515 } 2516 if (newShell.name != NULL) { 2517 shellName = newShell.name; 2518 } else { 2519 shellName = path; 2520 } 2521 if (!fullSpec) { 2522 if ((sh = JobMatchShell(shellName)) == NULL) { 2523 Parse_Error(PARSE_WARNING, "%s: No matching shell", 2524 shellName); 2525 free(words); 2526 return(FAILURE); 2527 } 2528 commandShell = sh; 2529 } else { 2530 commandShell = bmake_malloc(sizeof(Shell)); 2531 *commandShell = newShell; 2532 } 2533 /* this will take care of shellErrFlag */ 2534 Shell_Init(); 2535 } 2536 2537 if (commandShell->echoOn && commandShell->echoOff) { 2538 commandShell->hasEchoCtl = TRUE; 2539 } 2540 2541 if (!commandShell->hasErrCtl) { 2542 if (commandShell->errCheck == NULL) { 2543 commandShell->errCheck = ""; 2544 } 2545 if (commandShell->ignErr == NULL) { 2546 commandShell->ignErr = "%s\n"; 2547 } 2548 } 2549 2550 /* 2551 * Do not free up the words themselves, since they might be in use by the 2552 * shell specification. 2553 */ 2554 free(words); 2555 return SUCCESS; 2556 } 2557 2558 /*- 2559 *----------------------------------------------------------------------- 2560 * JobInterrupt -- 2561 * Handle the receipt of an interrupt. 2562 * 2563 * Input: 2564 * runINTERRUPT Non-zero if commands for the .INTERRUPT target 2565 * should be executed 2566 * signo signal received 2567 * 2568 * Results: 2569 * None 2570 * 2571 * Side Effects: 2572 * All children are killed. Another job will be started if the 2573 * .INTERRUPT target was given. 2574 *----------------------------------------------------------------------- 2575 */ 2576 static void 2577 JobInterrupt(int runINTERRUPT, int signo) 2578 { 2579 Job *job; /* job descriptor in that element */ 2580 GNode *interrupt; /* the node describing the .INTERRUPT target */ 2581 sigset_t mask; 2582 GNode *gn; 2583 2584 aborting = ABORT_INTERRUPT; 2585 2586 JobSigLock(&mask); 2587 2588 for (job = job_table; job < job_table_end; job++) { 2589 if (job->job_state != JOB_ST_RUNNING) 2590 continue; 2591 2592 gn = job->node; 2593 2594 if ((gn->type & (OP_JOIN|OP_PHONY)) == 0 && !Targ_Precious(gn)) { 2595 char *file = (gn->path == NULL ? gn->name : gn->path); 2596 if (!noExecute && eunlink(file) != -1) { 2597 Error("*** %s removed", file); 2598 } 2599 } 2600 if (job->pid) { 2601 if (DEBUG(JOB)) { 2602 (void)fprintf(debug_file, 2603 "JobInterrupt passing signal %d to child %d.\n", 2604 signo, job->pid); 2605 } 2606 KILLPG(job->pid, signo); 2607 } 2608 } 2609 2610 JobSigUnlock(&mask); 2611 2612 if (runINTERRUPT && !touchFlag) { 2613 interrupt = Targ_FindNode(".INTERRUPT", TARG_NOCREATE); 2614 if (interrupt != NULL) { 2615 ignoreErrors = FALSE; 2616 JobRun(interrupt); 2617 } 2618 } 2619 Trace_Log(MAKEINTR, 0); 2620 exit(signo); 2621 } 2622 2623 /* 2624 *----------------------------------------------------------------------- 2625 * Job_Finish -- 2626 * Do final processing such as the running of the commands 2627 * attached to the .END target. 2628 * 2629 * Results: 2630 * Number of errors reported. 2631 * 2632 * Side Effects: 2633 * None. 2634 *----------------------------------------------------------------------- 2635 */ 2636 int 2637 Job_Finish(void) 2638 { 2639 if (postCommands != NULL && 2640 (!Lst_IsEmpty(postCommands->commands) || 2641 !Lst_IsEmpty(postCommands->children))) { 2642 if (errors) { 2643 Error("Errors reported so .END ignored"); 2644 } else { 2645 JobRun(postCommands); 2646 } 2647 } 2648 return(errors); 2649 } 2650 2651 /*- 2652 *----------------------------------------------------------------------- 2653 * Job_End -- 2654 * Cleanup any memory used by the jobs module 2655 * 2656 * Results: 2657 * None. 2658 * 2659 * Side Effects: 2660 * Memory is freed 2661 *----------------------------------------------------------------------- 2662 */ 2663 void 2664 Job_End(void) 2665 { 2666 #ifdef CLEANUP 2667 free(shellArgv); 2668 #endif 2669 } 2670 2671 /*- 2672 *----------------------------------------------------------------------- 2673 * Job_Wait -- 2674 * Waits for all running jobs to finish and returns. Sets 'aborting' 2675 * to ABORT_WAIT to prevent other jobs from starting. 2676 * 2677 * Results: 2678 * None. 2679 * 2680 * Side Effects: 2681 * Currently running jobs finish. 2682 * 2683 *----------------------------------------------------------------------- 2684 */ 2685 void 2686 Job_Wait(void) 2687 { 2688 aborting = ABORT_WAIT; 2689 while (jobTokensRunning != 0) { 2690 Job_CatchOutput(); 2691 } 2692 aborting = 0; 2693 } 2694 2695 /*- 2696 *----------------------------------------------------------------------- 2697 * Job_AbortAll -- 2698 * Abort all currently running jobs without handling output or anything. 2699 * This function is to be called only in the event of a major 2700 * error. Most definitely NOT to be called from JobInterrupt. 2701 * 2702 * Results: 2703 * None 2704 * 2705 * Side Effects: 2706 * All children are killed, not just the firstborn 2707 *----------------------------------------------------------------------- 2708 */ 2709 void 2710 Job_AbortAll(void) 2711 { 2712 Job *job; /* the job descriptor in that element */ 2713 WAIT_T foo; 2714 2715 aborting = ABORT_ERROR; 2716 2717 if (jobTokensRunning) { 2718 for (job = job_table; job < job_table_end; job++) { 2719 if (job->job_state != JOB_ST_RUNNING) 2720 continue; 2721 /* 2722 * kill the child process with increasingly drastic signals to make 2723 * darn sure it's dead. 2724 */ 2725 KILLPG(job->pid, SIGINT); 2726 KILLPG(job->pid, SIGKILL); 2727 } 2728 } 2729 2730 /* 2731 * Catch as many children as want to report in at first, then give up 2732 */ 2733 while (waitpid((pid_t) -1, &foo, WNOHANG) > 0) 2734 continue; 2735 } 2736 2737 2738 /*- 2739 *----------------------------------------------------------------------- 2740 * JobRestartJobs -- 2741 * Tries to restart stopped jobs if there are slots available. 2742 * Called in process context in response to a SIGCONT. 2743 * 2744 * Results: 2745 * None. 2746 * 2747 * Side Effects: 2748 * Resumes jobs. 2749 * 2750 *----------------------------------------------------------------------- 2751 */ 2752 static void 2753 JobRestartJobs(void) 2754 { 2755 Job *job; 2756 2757 for (job = job_table; job < job_table_end; job++) { 2758 if (job->job_state == JOB_ST_RUNNING && 2759 (make_suspended || job->job_suspended)) { 2760 if (DEBUG(JOB)) { 2761 (void)fprintf(debug_file, "Restarting stopped job pid %d.\n", 2762 job->pid); 2763 } 2764 if (job->job_suspended) { 2765 (void)printf("*** [%s] Continued\n", job->node->name); 2766 (void)fflush(stdout); 2767 } 2768 job->job_suspended = 0; 2769 if (KILLPG(job->pid, SIGCONT) != 0 && DEBUG(JOB)) { 2770 fprintf(debug_file, "Failed to send SIGCONT to %d\n", job->pid); 2771 } 2772 } 2773 if (job->job_state == JOB_ST_FINISHED) 2774 /* Job exit deferred after calling waitpid() in a signal handler */ 2775 JobFinish(job, job->exit_status); 2776 } 2777 make_suspended = 0; 2778 } 2779 2780 static void 2781 watchfd(Job *job) 2782 { 2783 if (job->inPollfd != NULL) 2784 Punt("Watching watched job"); 2785 2786 fds[nfds].fd = job->inPipe; 2787 fds[nfds].events = POLLIN; 2788 jobfds[nfds] = job; 2789 job->inPollfd = &fds[nfds]; 2790 nfds++; 2791 } 2792 2793 static void 2794 clearfd(Job *job) 2795 { 2796 int i; 2797 if (job->inPollfd == NULL) 2798 Punt("Unwatching unwatched job"); 2799 i = job->inPollfd - fds; 2800 nfds--; 2801 /* 2802 * Move last job in table into hole made by dead job. 2803 */ 2804 if (nfds != i) { 2805 fds[i] = fds[nfds]; 2806 jobfds[i] = jobfds[nfds]; 2807 jobfds[i]->inPollfd = &fds[i]; 2808 } 2809 job->inPollfd = NULL; 2810 } 2811 2812 static int 2813 readyfd(Job *job) 2814 { 2815 if (job->inPollfd == NULL) 2816 Punt("Polling unwatched job"); 2817 return (job->inPollfd->revents & POLLIN) != 0; 2818 } 2819 2820 /*- 2821 *----------------------------------------------------------------------- 2822 * JobTokenAdd -- 2823 * Put a token into the job pipe so that some make process can start 2824 * another job. 2825 * 2826 * Side Effects: 2827 * Allows more build jobs to be spawned somewhere. 2828 * 2829 *----------------------------------------------------------------------- 2830 */ 2831 2832 static void 2833 JobTokenAdd(void) 2834 { 2835 char tok = JOB_TOKENS[aborting], tok1; 2836 2837 /* If we are depositing an error token flush everything else */ 2838 while (tok != '+' && read(tokenWaitJob.inPipe, &tok1, 1) == 1) 2839 continue; 2840 2841 if (DEBUG(JOB)) 2842 fprintf(debug_file, "(%d) aborting %d, deposit token %c\n", 2843 getpid(), aborting, JOB_TOKENS[aborting]); 2844 while (write(tokenWaitJob.outPipe, &tok, 1) == -1 && errno == EAGAIN) 2845 continue; 2846 } 2847 2848 /*- 2849 *----------------------------------------------------------------------- 2850 * Job_ServerStartTokenAdd -- 2851 * Prep the job token pipe in the root make process. 2852 * 2853 *----------------------------------------------------------------------- 2854 */ 2855 2856 void 2857 Job_ServerStart(int max_tokens, int jp_0, int jp_1) 2858 { 2859 int i; 2860 char jobarg[64]; 2861 2862 if (jp_0 >= 0 && jp_1 >= 0) { 2863 /* Pipe passed in from parent */ 2864 tokenWaitJob.inPipe = jp_0; 2865 tokenWaitJob.outPipe = jp_1; 2866 (void)fcntl(jp_0, F_SETFD, FD_CLOEXEC); 2867 (void)fcntl(jp_1, F_SETFD, FD_CLOEXEC); 2868 return; 2869 } 2870 2871 JobCreatePipe(&tokenWaitJob, 15); 2872 2873 snprintf(jobarg, sizeof(jobarg), "%d,%d", 2874 tokenWaitJob.inPipe, tokenWaitJob.outPipe); 2875 2876 Var_Append(MAKEFLAGS, "-J", VAR_GLOBAL); 2877 Var_Append(MAKEFLAGS, jobarg, VAR_GLOBAL); 2878 2879 /* 2880 * Preload the job pipe with one token per job, save the one 2881 * "extra" token for the primary job. 2882 * 2883 * XXX should clip maxJobs against PIPE_BUF -- if max_tokens is 2884 * larger than the write buffer size of the pipe, we will 2885 * deadlock here. 2886 */ 2887 for (i = 1; i < max_tokens; i++) 2888 JobTokenAdd(); 2889 } 2890 2891 /*- 2892 *----------------------------------------------------------------------- 2893 * Job_TokenReturn -- 2894 * Return a withdrawn token to the pool. 2895 * 2896 *----------------------------------------------------------------------- 2897 */ 2898 2899 void 2900 Job_TokenReturn(void) 2901 { 2902 jobTokensRunning--; 2903 if (jobTokensRunning < 0) 2904 Punt("token botch"); 2905 if (jobTokensRunning || JOB_TOKENS[aborting] != '+') 2906 JobTokenAdd(); 2907 } 2908 2909 /*- 2910 *----------------------------------------------------------------------- 2911 * Job_TokenWithdraw -- 2912 * Attempt to withdraw a token from the pool. 2913 * 2914 * Results: 2915 * Returns TRUE if a token was withdrawn, and FALSE if the pool 2916 * is currently empty. 2917 * 2918 * Side Effects: 2919 * If pool is empty, set wantToken so that we wake up 2920 * when a token is released. 2921 * 2922 *----------------------------------------------------------------------- 2923 */ 2924 2925 2926 Boolean 2927 Job_TokenWithdraw(void) 2928 { 2929 char tok, tok1; 2930 int count; 2931 2932 wantToken = 0; 2933 if (DEBUG(JOB)) 2934 fprintf(debug_file, "Job_TokenWithdraw(%d): aborting %d, running %d\n", 2935 getpid(), aborting, jobTokensRunning); 2936 2937 if (aborting || (jobTokensRunning >= maxJobs)) 2938 return FALSE; 2939 2940 count = read(tokenWaitJob.inPipe, &tok, 1); 2941 if (count == 0) 2942 Fatal("eof on job pipe!"); 2943 if (count < 0 && jobTokensRunning != 0) { 2944 if (errno != EAGAIN) { 2945 Fatal("job pipe read: %s", strerror(errno)); 2946 } 2947 if (DEBUG(JOB)) 2948 fprintf(debug_file, "(%d) blocked for token\n", getpid()); 2949 wantToken = 1; 2950 return FALSE; 2951 } 2952 2953 if (count == 1 && tok != '+') { 2954 /* make being abvorted - remove any other job tokens */ 2955 if (DEBUG(JOB)) 2956 fprintf(debug_file, "(%d) aborted by token %c\n", getpid(), tok); 2957 while (read(tokenWaitJob.inPipe, &tok1, 1) == 1) 2958 continue; 2959 /* And put the stopper back */ 2960 while (write(tokenWaitJob.outPipe, &tok, 1) == -1 && errno == EAGAIN) 2961 continue; 2962 Fatal("A failure has been detected in another branch of the parallel make"); 2963 } 2964 2965 if (count == 1 && jobTokensRunning == 0) 2966 /* We didn't want the token really */ 2967 while (write(tokenWaitJob.outPipe, &tok, 1) == -1 && errno == EAGAIN) 2968 continue; 2969 2970 jobTokensRunning++; 2971 if (DEBUG(JOB)) 2972 fprintf(debug_file, "(%d) withdrew token\n", getpid()); 2973 return TRUE; 2974 } 2975 2976 /*- 2977 *----------------------------------------------------------------------- 2978 * Job_RunTarget -- 2979 * Run the named target if found. If a filename is specified, then 2980 * set that to the sources. 2981 * 2982 * Results: 2983 * None 2984 * 2985 * Side Effects: 2986 * exits if the target fails. 2987 * 2988 *----------------------------------------------------------------------- 2989 */ 2990 Boolean 2991 Job_RunTarget(const char *target, const char *fname) { 2992 GNode *gn = Targ_FindNode(target, TARG_NOCREATE); 2993 2994 if (gn == NULL) 2995 return FALSE; 2996 2997 if (fname) 2998 Var_Set(ALLSRC, fname, gn, 0); 2999 3000 JobRun(gn); 3001 if (gn->made == ERROR) { 3002 PrintOnError(gn, "\n\nStop."); 3003 exit(1); 3004 } 3005 return TRUE; 3006 } 3007 3008 #ifdef USE_SELECT 3009 int 3010 emul_poll(struct pollfd *fd, int nfd, int timeout) 3011 { 3012 fd_set rfds, wfds; 3013 int i, maxfd, nselect, npoll; 3014 struct timeval tv, *tvp; 3015 long usecs; 3016 3017 FD_ZERO(&rfds); 3018 FD_ZERO(&wfds); 3019 3020 maxfd = -1; 3021 for (i = 0; i < nfd; i++) { 3022 fd[i].revents = 0; 3023 3024 if (fd[i].events & POLLIN) 3025 FD_SET(fd[i].fd, &rfds); 3026 3027 if (fd[i].events & POLLOUT) 3028 FD_SET(fd[i].fd, &wfds); 3029 3030 if (fd[i].fd > maxfd) 3031 maxfd = fd[i].fd; 3032 } 3033 3034 if (maxfd >= FD_SETSIZE) { 3035 Punt("Ran out of fd_set slots; " 3036 "recompile with a larger FD_SETSIZE."); 3037 } 3038 3039 if (timeout < 0) { 3040 tvp = NULL; 3041 } else { 3042 usecs = timeout * 1000; 3043 tv.tv_sec = usecs / 1000000; 3044 tv.tv_usec = usecs % 1000000; 3045 tvp = &tv; 3046 } 3047 3048 nselect = select(maxfd + 1, &rfds, &wfds, 0, tvp); 3049 3050 if (nselect <= 0) 3051 return nselect; 3052 3053 npoll = 0; 3054 for (i = 0; i < nfd; i++) { 3055 if (FD_ISSET(fd[i].fd, &rfds)) 3056 fd[i].revents |= POLLIN; 3057 3058 if (FD_ISSET(fd[i].fd, &wfds)) 3059 fd[i].revents |= POLLOUT; 3060 3061 if (fd[i].revents) 3062 npoll++; 3063 } 3064 3065 return npoll; 3066 } 3067 #endif /* USE_SELECT */ 3068