1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Kenneth Almquist. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)jobs.c 8.5 (Berkeley) 5/4/95 37 * $FreeBSD: src/bin/sh/jobs.c,v 1.27.2.10 2003/04/04 08:16:26 tjr Exp $ 38 * $DragonFly: src/bin/sh/jobs.c,v 1.5 2004/03/19 18:39:41 cpressey Exp $ 39 */ 40 41 #include <fcntl.h> 42 #include <signal.h> 43 #include <errno.h> 44 #include <paths.h> 45 #include <unistd.h> 46 #include <stdlib.h> 47 #include <sys/param.h> 48 #include <sys/wait.h> 49 #include <sys/time.h> 50 #include <sys/resource.h> 51 #include <paths.h> 52 #include <sys/ioctl.h> 53 54 #include "shell.h" 55 #if JOBS 56 #include <termios.h> 57 #undef CEOF /* syntax.h redefines this */ 58 #endif 59 #include "redir.h" 60 #include "show.h" 61 #include "main.h" 62 #include "parser.h" 63 #include "nodes.h" 64 #include "jobs.h" 65 #include "options.h" 66 #include "trap.h" 67 #include "syntax.h" 68 #include "input.h" 69 #include "output.h" 70 #include "memalloc.h" 71 #include "error.h" 72 #include "mystring.h" 73 74 75 STATIC struct job *jobtab; /* array of jobs */ 76 STATIC int njobs; /* size of array */ 77 MKINIT pid_t backgndpid = -1; /* pid of last background process */ 78 #if JOBS 79 STATIC struct job *jobmru; /* most recently used job list */ 80 STATIC pid_t initialpgrp; /* pgrp of shell on invocation */ 81 #endif 82 int in_waitcmd = 0; /* are we in waitcmd()? */ 83 int in_dowait = 0; /* are we in dowait()? */ 84 volatile sig_atomic_t breakwaitcmd = 0; /* should wait be terminated? */ 85 static int ttyfd = -1; 86 87 #if JOBS 88 STATIC void restartjob(struct job *); 89 #endif 90 STATIC void freejob(struct job *); 91 STATIC struct job *getjob(char *); 92 STATIC pid_t dowait(int, struct job *); 93 STATIC pid_t waitproc(int, int *); 94 STATIC void cmdtxt(union node *); 95 STATIC void cmdputs(const char *); 96 #if JOBS 97 STATIC void setcurjob(struct job *); 98 STATIC void deljob(struct job *); 99 STATIC struct job *getcurjob(struct job *); 100 #endif 101 STATIC void showjob(struct job *, pid_t, int, int); 102 103 104 /* 105 * Turn job control on and off. 106 */ 107 108 MKINIT int jobctl; 109 110 #if JOBS 111 void 112 setjobctl(int on) 113 { 114 int i; 115 116 if (on == jobctl || rootshell == 0) 117 return; 118 if (on) { 119 if (ttyfd != -1) 120 close(ttyfd); 121 if ((ttyfd = open(_PATH_TTY, O_RDWR)) < 0) { 122 i = 0; 123 while (i <= 2 && !isatty(i)) 124 i++; 125 if (i > 2 || (ttyfd = fcntl(i, F_DUPFD, 10)) < 0) 126 goto out; 127 } 128 if (ttyfd < 10) { 129 /* 130 * Keep our TTY file descriptor out of the way of 131 * the user's redirections. 132 */ 133 if ((i = fcntl(ttyfd, F_DUPFD, 10)) < 0) { 134 close(ttyfd); 135 ttyfd = -1; 136 goto out; 137 } 138 close(ttyfd); 139 ttyfd = i; 140 } 141 if (fcntl(ttyfd, F_SETFD, FD_CLOEXEC) < 0) { 142 close(ttyfd); 143 ttyfd = -1; 144 goto out; 145 } 146 do { /* while we are in the background */ 147 initialpgrp = tcgetpgrp(ttyfd); 148 if (initialpgrp < 0) { 149 out: out2str("sh: can't access tty; job control turned off\n"); 150 mflag = 0; 151 return; 152 } 153 if (initialpgrp == -1) 154 initialpgrp = getpgrp(); 155 else if (initialpgrp != getpgrp()) { 156 killpg(0, SIGTTIN); 157 continue; 158 } 159 } while (0); 160 setsignal(SIGTSTP); 161 setsignal(SIGTTOU); 162 setsignal(SIGTTIN); 163 setpgid(0, rootpid); 164 tcsetpgrp(ttyfd, rootpid); 165 } else { /* turning job control off */ 166 setpgid(0, initialpgrp); 167 tcsetpgrp(ttyfd, initialpgrp); 168 close(ttyfd); 169 ttyfd = -1; 170 setsignal(SIGTSTP); 171 setsignal(SIGTTOU); 172 setsignal(SIGTTIN); 173 } 174 jobctl = on; 175 } 176 #endif 177 178 179 #ifdef mkinit 180 INCLUDE <sys/types.h> 181 INCLUDE <stdlib.h> 182 183 SHELLPROC { 184 backgndpid = -1; 185 #if JOBS 186 jobctl = 0; 187 #endif 188 } 189 190 #endif 191 192 193 194 #if JOBS 195 int 196 fgcmd(int argc __unused, char **argv) 197 { 198 struct job *jp; 199 pid_t pgrp; 200 int status; 201 202 jp = getjob(argv[1]); 203 if (jp->jobctl == 0) 204 error("job not created under job control"); 205 out1str(jp->ps[0].cmd); 206 out1c('\n'); 207 flushout(&output); 208 pgrp = jp->ps[0].pid; 209 tcsetpgrp(ttyfd, pgrp); 210 restartjob(jp); 211 jp->foreground = 1; 212 INTOFF; 213 status = waitforjob(jp, (int *)NULL); 214 INTON; 215 return status; 216 } 217 218 219 int 220 bgcmd(int argc, char **argv) 221 { 222 char s[64]; 223 struct job *jp; 224 225 do { 226 jp = getjob(*++argv); 227 if (jp->jobctl == 0) 228 error("job not created under job control"); 229 if (jp->state == JOBDONE) 230 continue; 231 restartjob(jp); 232 jp->foreground = 0; 233 fmtstr(s, 64, "[%d] ", jp - jobtab + 1); 234 out1str(s); 235 out1str(jp->ps[0].cmd); 236 out1c('\n'); 237 } while (--argc > 1); 238 return 0; 239 } 240 241 242 STATIC void 243 restartjob(struct job *jp) 244 { 245 struct procstat *ps; 246 int i; 247 248 if (jp->state == JOBDONE) 249 return; 250 setcurjob(jp); 251 INTOFF; 252 killpg(jp->ps[0].pid, SIGCONT); 253 for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { 254 if (WIFSTOPPED(ps->status)) { 255 ps->status = -1; 256 jp->state = 0; 257 } 258 } 259 INTON; 260 } 261 #endif 262 263 264 int 265 jobscmd(int argc, char *argv[]) 266 { 267 char *id; 268 int ch, sformat, lformat; 269 270 optind = optreset = 1; 271 opterr = 0; 272 sformat = lformat = 0; 273 while ((ch = getopt(argc, argv, "ls")) != -1) { 274 switch (ch) { 275 case 'l': 276 lformat = 1; 277 break; 278 case 's': 279 sformat = 1; 280 break; 281 case '?': 282 default: 283 error("unknown option: -%c", optopt); 284 } 285 } 286 argc -= optind; 287 argv += optind; 288 289 if (argc == 0) 290 showjobs(0, sformat, lformat); 291 else 292 while ((id = *argv++) != NULL) 293 showjob(getjob(id), 0, sformat, lformat); 294 295 return (0); 296 } 297 298 STATIC void 299 showjob(struct job *jp, pid_t pid, int sformat, int lformat) 300 { 301 char s[64]; 302 struct procstat *ps; 303 struct job *j; 304 int col, curr, i, jobno, prev, procno; 305 char c; 306 307 procno = jp->nprocs; 308 jobno = jp - jobtab + 1; 309 curr = prev = 0; 310 #if JOBS 311 if ((j = getcurjob(NULL)) != NULL) { 312 curr = j - jobtab + 1; 313 if ((j = getcurjob(j)) != NULL) 314 prev = j - jobtab + 1; 315 } 316 #endif 317 for (ps = jp->ps ; ; ps++) { /* for each process */ 318 if (sformat) { 319 out1fmt("%d\n", (int)ps->pid); 320 goto skip; 321 } 322 if (!lformat && ps != jp->ps && pid == 0) 323 goto skip; 324 if (pid != 0 && pid != ps->pid) 325 goto skip; 326 if (jobno == curr && ps == jp->ps) 327 c = '+'; 328 else if (jobno == prev && ps == jp->ps) 329 c = '-'; 330 else 331 c = ' '; 332 if (ps == jp->ps) 333 fmtstr(s, 64, "[%d] %c ", jobno, c); 334 else 335 fmtstr(s, 64, " %c ", c); 336 out1str(s); 337 col = strlen(s); 338 if (lformat) { 339 fmtstr(s, 64, "%d ", (int)ps->pid); 340 out1str(s); 341 col += strlen(s); 342 } 343 s[0] = '\0'; 344 if (ps != jp->ps) { 345 *s = '\0'; 346 } else if (ps->status == -1) { 347 strcpy(s, "Running"); 348 } else if (WIFEXITED(ps->status)) { 349 if (WEXITSTATUS(ps->status) == 0) 350 strcpy(s, "Done"); 351 else 352 fmtstr(s, 64, "Done (%d)", 353 WEXITSTATUS(ps->status)); 354 } else { 355 #if JOBS 356 if (WIFSTOPPED(ps->status)) 357 i = WSTOPSIG(ps->status); 358 else 359 #endif 360 i = WTERMSIG(ps->status); 361 if ((i & 0x7F) < sys_nsig && sys_siglist[i & 0x7F]) 362 scopy(sys_siglist[i & 0x7F], s); 363 else 364 fmtstr(s, 64, "Signal %d", i & 0x7F); 365 if (WCOREDUMP(ps->status)) 366 strcat(s, " (core dumped)"); 367 } 368 out1str(s); 369 col += strlen(s); 370 do { 371 out1c(' '); 372 col++; 373 } while (col < 30); 374 out1str(ps->cmd); 375 out1c('\n'); 376 skip: if (--procno <= 0) 377 break; 378 } 379 } 380 381 /* 382 * Print a list of jobs. If "change" is nonzero, only print jobs whose 383 * statuses have changed since the last call to showjobs. 384 * 385 * If the shell is interrupted in the process of creating a job, the 386 * result may be a job structure containing zero processes. Such structures 387 * will be freed here. 388 */ 389 390 void 391 showjobs(int change, int sformat, int lformat) 392 { 393 int jobno; 394 struct job *jp; 395 396 TRACE(("showjobs(%d) called\n", change)); 397 while (dowait(0, (struct job *)NULL) > 0); 398 for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) { 399 if (! jp->used) 400 continue; 401 if (jp->nprocs == 0) { 402 freejob(jp); 403 continue; 404 } 405 if (change && ! jp->changed) 406 continue; 407 showjob(jp, 0, sformat, lformat); 408 jp->changed = 0; 409 if (jp->state == JOBDONE) { 410 freejob(jp); 411 } 412 } 413 } 414 415 416 /* 417 * Mark a job structure as unused. 418 */ 419 420 STATIC void 421 freejob(struct job *jp) 422 { 423 struct procstat *ps; 424 int i; 425 426 INTOFF; 427 for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) { 428 if (ps->cmd != nullstr) 429 ckfree(ps->cmd); 430 } 431 if (jp->ps != &jp->ps0) 432 ckfree(jp->ps); 433 jp->used = 0; 434 #if JOBS 435 deljob(jp); 436 #endif 437 INTON; 438 } 439 440 441 442 int 443 waitcmd(int argc, char **argv) 444 { 445 struct job *job; 446 int status, retval; 447 struct job *jp; 448 449 if (argc > 1) { 450 job = getjob(argv[1]); 451 } else { 452 job = NULL; 453 } 454 455 /* 456 * Loop until a process is terminated or stopped, or a SIGINT is 457 * received. 458 */ 459 460 in_waitcmd++; 461 do { 462 if (job != NULL) { 463 if (job->state) { 464 status = job->ps[job->nprocs - 1].status; 465 if (WIFEXITED(status)) 466 retval = WEXITSTATUS(status); 467 #if JOBS 468 else if (WIFSTOPPED(status)) 469 retval = WSTOPSIG(status) + 128; 470 #endif 471 else 472 retval = WTERMSIG(status) + 128; 473 if (! iflag) 474 freejob(job); 475 in_waitcmd--; 476 return retval; 477 } 478 } else { 479 for (jp = jobtab ; ; jp++) { 480 if (jp >= jobtab + njobs) { /* no running procs */ 481 in_waitcmd--; 482 return 0; 483 } 484 if (jp->used && jp->state == 0) 485 break; 486 } 487 } 488 } while (dowait(1, (struct job *)NULL) != -1); 489 in_waitcmd--; 490 491 return 0; 492 } 493 494 495 496 int 497 jobidcmd(int argc __unused, char **argv) 498 { 499 struct job *jp; 500 int i; 501 502 jp = getjob(argv[1]); 503 for (i = 0 ; i < jp->nprocs ; ) { 504 out1fmt("%d", (int)jp->ps[i].pid); 505 out1c(++i < jp->nprocs? ' ' : '\n'); 506 } 507 return 0; 508 } 509 510 511 512 /* 513 * Convert a job name to a job structure. 514 */ 515 516 STATIC struct job * 517 getjob(char *name) 518 { 519 int jobno; 520 struct job *found, *jp; 521 pid_t pid; 522 int i; 523 524 if (name == NULL) { 525 #if JOBS 526 currentjob: if ((jp = getcurjob(NULL)) == NULL) 527 error("No current job"); 528 return (jp); 529 #else 530 error("No current job"); 531 #endif 532 } else if (name[0] == '%') { 533 if (is_digit(name[1])) { 534 jobno = number(name + 1); 535 if (jobno > 0 && jobno <= njobs 536 && jobtab[jobno - 1].used != 0) 537 return &jobtab[jobno - 1]; 538 #if JOBS 539 } else if (name[1] == '%' && name[2] == '\0') { 540 goto currentjob; 541 } else if (name[1] == '+' && name[2] == '\0') { 542 goto currentjob; 543 } else if (name[1] == '-' && name[2] == '\0') { 544 if ((jp = getcurjob(NULL)) == NULL || 545 (jp = getcurjob(jp)) == NULL) 546 error("No previous job"); 547 return (jp); 548 #endif 549 } else if (name[1] == '?') { 550 found = NULL; 551 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 552 if (jp->used && jp->nprocs > 0 553 && strstr(jp->ps[0].cmd, name + 2) != NULL) { 554 if (found) 555 error("%s: ambiguous", name); 556 found = jp; 557 } 558 } 559 if (found != NULL) 560 return (found); 561 } else { 562 found = NULL; 563 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 564 if (jp->used && jp->nprocs > 0 565 && prefix(name + 1, jp->ps[0].cmd)) { 566 if (found) 567 error("%s: ambiguous", name); 568 found = jp; 569 } 570 } 571 if (found) 572 return found; 573 } 574 } else if (is_number(name)) { 575 pid = (pid_t)number(name); 576 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 577 if (jp->used && jp->nprocs > 0 578 && jp->ps[jp->nprocs - 1].pid == pid) 579 return jp; 580 } 581 } 582 error("No such job: %s", name); 583 /*NOTREACHED*/ 584 return NULL; 585 } 586 587 588 589 /* 590 * Return a new job structure, 591 */ 592 593 struct job * 594 makejob(union node *node __unused, int nprocs) 595 { 596 int i; 597 struct job *jp; 598 599 for (i = njobs, jp = jobtab ; ; jp++) { 600 if (--i < 0) { 601 INTOFF; 602 if (njobs == 0) { 603 jobtab = ckmalloc(4 * sizeof jobtab[0]); 604 #if JOBS 605 jobmru = NULL; 606 #endif 607 } else { 608 jp = ckmalloc((njobs + 4) * sizeof jobtab[0]); 609 memcpy(jp, jobtab, njobs * sizeof jp[0]); 610 #if JOBS 611 /* Relocate `next' pointers and list head */ 612 if (jobmru != NULL) 613 jobmru = &jp[jobmru - jobtab]; 614 for (i = 0; i < njobs; i++) 615 if (jp[i].next != NULL) 616 jp[i].next = &jp[jp[i].next - 617 jobtab]; 618 #endif 619 /* Relocate `ps' pointers */ 620 for (i = 0; i < njobs; i++) 621 if (jp[i].ps == &jobtab[i].ps0) 622 jp[i].ps = &jp[i].ps0; 623 ckfree(jobtab); 624 jobtab = jp; 625 } 626 jp = jobtab + njobs; 627 for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0); 628 INTON; 629 break; 630 } 631 if (jp->used == 0) 632 break; 633 } 634 INTOFF; 635 jp->state = 0; 636 jp->used = 1; 637 jp->changed = 0; 638 jp->nprocs = 0; 639 jp->foreground = 0; 640 #if JOBS 641 jp->jobctl = jobctl; 642 jp->next = NULL; 643 #endif 644 if (nprocs > 1) { 645 jp->ps = ckmalloc(nprocs * sizeof (struct procstat)); 646 } else { 647 jp->ps = &jp->ps0; 648 } 649 INTON; 650 TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long)node, nprocs, 651 jp - jobtab + 1)); 652 return jp; 653 } 654 655 #if JOBS 656 STATIC void 657 setcurjob(struct job *cj) 658 { 659 struct job *jp, *prev; 660 661 for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) { 662 if (jp == cj) { 663 if (prev != NULL) 664 prev->next = jp->next; 665 else 666 jobmru = jp->next; 667 jp->next = jobmru; 668 jobmru = cj; 669 return; 670 } 671 } 672 cj->next = jobmru; 673 jobmru = cj; 674 } 675 676 STATIC void 677 deljob(struct job *j) 678 { 679 struct job *jp, *prev; 680 681 for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) { 682 if (jp == j) { 683 if (prev != NULL) 684 prev->next = jp->next; 685 else 686 jobmru = jp->next; 687 return; 688 } 689 } 690 } 691 692 /* 693 * Return the most recently used job that isn't `nj', and preferably one 694 * that is stopped. 695 */ 696 STATIC struct job * 697 getcurjob(struct job *nj) 698 { 699 struct job *jp; 700 701 /* Try to find a stopped one.. */ 702 for (jp = jobmru; jp != NULL; jp = jp->next) 703 if (jp->used && jp != nj && jp->state == JOBSTOPPED) 704 return (jp); 705 /* Otherwise the most recently used job that isn't `nj' */ 706 for (jp = jobmru; jp != NULL; jp = jp->next) 707 if (jp->used && jp != nj) 708 return (jp); 709 710 return (NULL); 711 } 712 713 #endif 714 715 /* 716 * Fork of a subshell. If we are doing job control, give the subshell its 717 * own process group. Jp is a job structure that the job is to be added to. 718 * N is the command that will be evaluated by the child. Both jp and n may 719 * be NULL. The mode parameter can be one of the following: 720 * FORK_FG - Fork off a foreground process. 721 * FORK_BG - Fork off a background process. 722 * FORK_NOJOB - Like FORK_FG, but don't give the process its own 723 * process group even if job control is on. 724 * 725 * When job control is turned off, background processes have their standard 726 * input redirected to /dev/null (except for the second and later processes 727 * in a pipeline). 728 */ 729 730 pid_t 731 forkshell(struct job *jp, union node *n, int mode) 732 { 733 pid_t pid; 734 pid_t pgrp; 735 736 TRACE(("forkshell(%%%d, 0x%lx, %d) called\n", jp - jobtab, (long)n, 737 mode)); 738 INTOFF; 739 flushall(); 740 pid = fork(); 741 if (pid == -1) { 742 TRACE(("Fork failed, errno=%d\n", errno)); 743 INTON; 744 error("Cannot fork: %s", strerror(errno)); 745 } 746 if (pid == 0) { 747 struct job *p; 748 int wasroot; 749 int i; 750 751 TRACE(("Child shell %d\n", (int)getpid())); 752 wasroot = rootshell; 753 rootshell = 0; 754 closescript(); 755 INTON; 756 clear_traps(); 757 #if JOBS 758 jobctl = 0; /* do job control only in root shell */ 759 if (wasroot && mode != FORK_NOJOB && mflag) { 760 if (jp == NULL || jp->nprocs == 0) 761 pgrp = getpid(); 762 else 763 pgrp = jp->ps[0].pid; 764 if (setpgid(0, pgrp) == 0 && mode == FORK_FG) { 765 /*** this causes superfluous TIOCSPGRPS ***/ 766 if (tcsetpgrp(ttyfd, pgrp) < 0) 767 error("tcsetpgrp failed, errno=%d", errno); 768 } 769 setsignal(SIGTSTP); 770 setsignal(SIGTTOU); 771 } else if (mode == FORK_BG) { 772 ignoresig(SIGINT); 773 ignoresig(SIGQUIT); 774 if ((jp == NULL || jp->nprocs == 0) && 775 ! fd0_redirected_p ()) { 776 close(0); 777 if (open(_PATH_DEVNULL, O_RDONLY) != 0) 778 error("Can't open %s: %s", 779 _PATH_DEVNULL, strerror(errno)); 780 } 781 } 782 #else 783 if (mode == FORK_BG) { 784 ignoresig(SIGINT); 785 ignoresig(SIGQUIT); 786 if ((jp == NULL || jp->nprocs == 0) && 787 ! fd0_redirected_p ()) { 788 close(0); 789 if (open(_PATH_DEVNULL, O_RDONLY) != 0) 790 error("Can't open %s: %s", 791 _PATH_DEVNULL, strerror(errno)); 792 } 793 } 794 #endif 795 INTOFF; 796 for (i = njobs, p = jobtab ; --i >= 0 ; p++) 797 if (p->used) 798 freejob(p); 799 INTON; 800 if (wasroot && iflag) { 801 setsignal(SIGINT); 802 setsignal(SIGQUIT); 803 setsignal(SIGTERM); 804 } 805 return pid; 806 } 807 if (rootshell && mode != FORK_NOJOB && mflag) { 808 if (jp == NULL || jp->nprocs == 0) 809 pgrp = pid; 810 else 811 pgrp = jp->ps[0].pid; 812 setpgid(pid, pgrp); 813 } 814 if (mode == FORK_BG) 815 backgndpid = pid; /* set $! */ 816 if (jp) { 817 struct procstat *ps = &jp->ps[jp->nprocs++]; 818 ps->pid = pid; 819 ps->status = -1; 820 ps->cmd = nullstr; 821 if (iflag && rootshell && n) 822 ps->cmd = commandtext(n); 823 jp->foreground = mode == FORK_FG; 824 #if JOBS 825 setcurjob(jp); 826 #endif 827 } 828 INTON; 829 TRACE(("In parent shell: child = %d\n", (int)pid)); 830 return pid; 831 } 832 833 834 835 /* 836 * Wait for job to finish. 837 * 838 * Under job control we have the problem that while a child process is 839 * running interrupts generated by the user are sent to the child but not 840 * to the shell. This means that an infinite loop started by an inter- 841 * active user may be hard to kill. With job control turned off, an 842 * interactive user may place an interactive program inside a loop. If 843 * the interactive program catches interrupts, the user doesn't want 844 * these interrupts to also abort the loop. The approach we take here 845 * is to have the shell ignore interrupt signals while waiting for a 846 * foreground process to terminate, and then send itself an interrupt 847 * signal if the child process was terminated by an interrupt signal. 848 * Unfortunately, some programs want to do a bit of cleanup and then 849 * exit on interrupt; unless these processes terminate themselves by 850 * sending a signal to themselves (instead of calling exit) they will 851 * confuse this approach. 852 */ 853 854 int 855 waitforjob(struct job *jp, int *origstatus) 856 { 857 #if JOBS 858 pid_t mypgrp = getpgrp(); 859 #endif 860 int status; 861 int st; 862 863 INTOFF; 864 TRACE(("waitforjob(%%%d) called\n", jp - jobtab + 1)); 865 while (jp->state == 0) 866 if (dowait(1, jp) == -1) 867 dotrap(); 868 #if JOBS 869 if (jp->jobctl) { 870 if (tcsetpgrp(ttyfd, mypgrp) < 0) 871 error("tcsetpgrp failed, errno=%d\n", errno); 872 } 873 if (jp->state == JOBSTOPPED) 874 setcurjob(jp); 875 #endif 876 status = jp->ps[jp->nprocs - 1].status; 877 if (origstatus != NULL) 878 *origstatus = status; 879 /* convert to 8 bits */ 880 if (WIFEXITED(status)) 881 st = WEXITSTATUS(status); 882 #if JOBS 883 else if (WIFSTOPPED(status)) 884 st = WSTOPSIG(status) + 128; 885 #endif 886 else 887 st = WTERMSIG(status) + 128; 888 if (! JOBS || jp->state == JOBDONE) 889 freejob(jp); 890 if (int_pending()) { 891 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGINT) 892 kill(getpid(), SIGINT); 893 else 894 CLEAR_PENDING_INT; 895 } 896 INTON; 897 return st; 898 } 899 900 901 902 /* 903 * Wait for a process to terminate. 904 */ 905 906 STATIC pid_t 907 dowait(int block, struct job *job) 908 { 909 pid_t pid; 910 int status; 911 struct procstat *sp; 912 struct job *jp; 913 struct job *thisjob; 914 int done; 915 int stopped; 916 int sig; 917 int i; 918 919 in_dowait++; 920 TRACE(("dowait(%d) called\n", block)); 921 do { 922 pid = waitproc(block, &status); 923 TRACE(("wait returns %d, status=%d\n", (int)pid, status)); 924 } while ((pid == -1 && errno == EINTR && breakwaitcmd == 0) || 925 (WIFSTOPPED(status) && !iflag)); 926 in_dowait--; 927 if (breakwaitcmd != 0) { 928 breakwaitcmd = 0; 929 return -1; 930 } 931 if (pid <= 0) 932 return pid; 933 INTOFF; 934 thisjob = NULL; 935 for (jp = jobtab ; jp < jobtab + njobs ; jp++) { 936 if (jp->used) { 937 done = 1; 938 stopped = 1; 939 for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) { 940 if (sp->pid == -1) 941 continue; 942 if (sp->pid == pid) { 943 TRACE(("Changing status of proc %d from 0x%x to 0x%x\n", 944 (int)pid, sp->status, 945 status)); 946 sp->status = status; 947 thisjob = jp; 948 } 949 if (sp->status == -1) 950 stopped = 0; 951 else if (WIFSTOPPED(sp->status)) 952 done = 0; 953 } 954 if (stopped) { /* stopped or done */ 955 int state = done? JOBDONE : JOBSTOPPED; 956 if (jp->state != state) { 957 TRACE(("Job %d: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state)); 958 jp->state = state; 959 #if JOBS 960 if (done) 961 deljob(jp); 962 #endif 963 } 964 } 965 } 966 } 967 INTON; 968 if (! rootshell || ! iflag || (job && thisjob == job)) { 969 #if JOBS 970 if (WIFSTOPPED(status)) 971 sig = WSTOPSIG(status); 972 else 973 #endif 974 { 975 if (WIFEXITED(status)) 976 sig = 0; 977 else 978 sig = WTERMSIG(status); 979 } 980 if (sig != 0 && sig != SIGINT && sig != SIGPIPE) { 981 if (!mflag || 982 (thisjob->foreground && !WIFSTOPPED(status))) { 983 i = WTERMSIG(status); 984 if ((i & 0x7F) < sys_nsig && sys_siglist[i & 0x7F]) 985 out1str(sys_siglist[i & 0x7F]); 986 else 987 out1fmt("Signal %d", i & 0x7F); 988 if (WCOREDUMP(status)) 989 out1str(" (core dumped)"); 990 out1c('\n'); 991 } else 992 showjob(thisjob, pid, 0, 0); 993 } 994 } else { 995 TRACE(("Not printing status, rootshell=%d, job=0x%x\n", rootshell, job)); 996 if (thisjob) 997 thisjob->changed = 1; 998 } 999 return pid; 1000 } 1001 1002 1003 1004 /* 1005 * Do a wait system call. If job control is compiled in, we accept 1006 * stopped processes. If block is zero, we return a value of zero 1007 * rather than blocking. 1008 */ 1009 STATIC pid_t 1010 waitproc(int block, int *status) 1011 { 1012 int flags; 1013 1014 #if JOBS 1015 flags = WUNTRACED; 1016 #else 1017 flags = 0; 1018 #endif 1019 if (block == 0) 1020 flags |= WNOHANG; 1021 return wait3(status, flags, (struct rusage *)NULL); 1022 } 1023 1024 /* 1025 * return 1 if there are stopped jobs, otherwise 0 1026 */ 1027 int job_warning = 0; 1028 int 1029 stoppedjobs(void) 1030 { 1031 int jobno; 1032 struct job *jp; 1033 1034 if (job_warning) 1035 return (0); 1036 for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) { 1037 if (jp->used == 0) 1038 continue; 1039 if (jp->state == JOBSTOPPED) { 1040 out2str("You have stopped jobs.\n"); 1041 job_warning = 2; 1042 return (1); 1043 } 1044 } 1045 1046 return (0); 1047 } 1048 1049 /* 1050 * Return a string identifying a command (to be printed by the 1051 * jobs command. 1052 */ 1053 1054 STATIC char *cmdnextc; 1055 STATIC int cmdnleft; 1056 #define MAXCMDTEXT 200 1057 1058 char * 1059 commandtext(union node *n) 1060 { 1061 char *name; 1062 1063 cmdnextc = name = ckmalloc(MAXCMDTEXT); 1064 cmdnleft = MAXCMDTEXT - 4; 1065 cmdtxt(n); 1066 *cmdnextc = '\0'; 1067 return name; 1068 } 1069 1070 1071 STATIC void 1072 cmdtxt(union node *n) 1073 { 1074 union node *np; 1075 struct nodelist *lp; 1076 const char *p; 1077 int i; 1078 char s[2]; 1079 1080 if (n == NULL) 1081 return; 1082 switch (n->type) { 1083 case NSEMI: 1084 cmdtxt(n->nbinary.ch1); 1085 cmdputs("; "); 1086 cmdtxt(n->nbinary.ch2); 1087 break; 1088 case NAND: 1089 cmdtxt(n->nbinary.ch1); 1090 cmdputs(" && "); 1091 cmdtxt(n->nbinary.ch2); 1092 break; 1093 case NOR: 1094 cmdtxt(n->nbinary.ch1); 1095 cmdputs(" || "); 1096 cmdtxt(n->nbinary.ch2); 1097 break; 1098 case NPIPE: 1099 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 1100 cmdtxt(lp->n); 1101 if (lp->next) 1102 cmdputs(" | "); 1103 } 1104 break; 1105 case NSUBSHELL: 1106 cmdputs("("); 1107 cmdtxt(n->nredir.n); 1108 cmdputs(")"); 1109 break; 1110 case NREDIR: 1111 case NBACKGND: 1112 cmdtxt(n->nredir.n); 1113 break; 1114 case NIF: 1115 cmdputs("if "); 1116 cmdtxt(n->nif.test); 1117 cmdputs("; then "); 1118 cmdtxt(n->nif.ifpart); 1119 cmdputs("..."); 1120 break; 1121 case NWHILE: 1122 cmdputs("while "); 1123 goto until; 1124 case NUNTIL: 1125 cmdputs("until "); 1126 until: 1127 cmdtxt(n->nbinary.ch1); 1128 cmdputs("; do "); 1129 cmdtxt(n->nbinary.ch2); 1130 cmdputs("; done"); 1131 break; 1132 case NFOR: 1133 cmdputs("for "); 1134 cmdputs(n->nfor.var); 1135 cmdputs(" in ..."); 1136 break; 1137 case NCASE: 1138 cmdputs("case "); 1139 cmdputs(n->ncase.expr->narg.text); 1140 cmdputs(" in ..."); 1141 break; 1142 case NDEFUN: 1143 cmdputs(n->narg.text); 1144 cmdputs("() ..."); 1145 break; 1146 case NCMD: 1147 for (np = n->ncmd.args ; np ; np = np->narg.next) { 1148 cmdtxt(np); 1149 if (np->narg.next) 1150 cmdputs(" "); 1151 } 1152 for (np = n->ncmd.redirect ; np ; np = np->nfile.next) { 1153 cmdputs(" "); 1154 cmdtxt(np); 1155 } 1156 break; 1157 case NARG: 1158 cmdputs(n->narg.text); 1159 break; 1160 case NTO: 1161 p = ">"; i = 1; goto redir; 1162 case NAPPEND: 1163 p = ">>"; i = 1; goto redir; 1164 case NTOFD: 1165 p = ">&"; i = 1; goto redir; 1166 case NCLOBBER: 1167 p = ">|"; i = 1; goto redir; 1168 case NFROM: 1169 p = "<"; i = 0; goto redir; 1170 case NFROMTO: 1171 p = "<>"; i = 0; goto redir; 1172 case NFROMFD: 1173 p = "<&"; i = 0; goto redir; 1174 redir: 1175 if (n->nfile.fd != i) { 1176 s[0] = n->nfile.fd + '0'; 1177 s[1] = '\0'; 1178 cmdputs(s); 1179 } 1180 cmdputs(p); 1181 if (n->type == NTOFD || n->type == NFROMFD) { 1182 if (n->ndup.dupfd >= 0) 1183 s[0] = n->ndup.dupfd + '0'; 1184 else 1185 s[0] = '-'; 1186 s[1] = '\0'; 1187 cmdputs(s); 1188 } else { 1189 cmdtxt(n->nfile.fname); 1190 } 1191 break; 1192 case NHERE: 1193 case NXHERE: 1194 cmdputs("<<..."); 1195 break; 1196 default: 1197 cmdputs("???"); 1198 break; 1199 } 1200 } 1201 1202 1203 1204 STATIC void 1205 cmdputs(const char *s) 1206 { 1207 const char *p; 1208 char *q; 1209 char c; 1210 int subtype = 0; 1211 1212 if (cmdnleft <= 0) 1213 return; 1214 p = s; 1215 q = cmdnextc; 1216 while ((c = *p++) != '\0') { 1217 if (c == CTLESC) 1218 *q++ = *p++; 1219 else if (c == CTLVAR) { 1220 *q++ = '$'; 1221 if (--cmdnleft > 0) 1222 *q++ = '{'; 1223 subtype = *p++; 1224 } else if (c == '=' && subtype != 0) { 1225 *q++ = "}-+?="[(subtype & VSTYPE) - VSNORMAL]; 1226 subtype = 0; 1227 } else if (c == CTLENDVAR) { 1228 *q++ = '}'; 1229 } else if (c == CTLBACKQ || c == CTLBACKQ+CTLQUOTE) 1230 cmdnleft++; /* ignore it */ 1231 else 1232 *q++ = c; 1233 if (--cmdnleft <= 0) { 1234 *q++ = '.'; 1235 *q++ = '.'; 1236 *q++ = '.'; 1237 break; 1238 } 1239 } 1240 cmdnextc = q; 1241 } 1242