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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)jobs.c 8.5 (Berkeley) 5/4/95"; 36 #endif 37 #endif /* not lint */ 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD: head/bin/sh/jobs.c 361112 2020-05-16 16:29:23Z jilles $"); 40 41 #include <sys/ioctl.h> 42 #include <sys/param.h> 43 #include <sys/resource.h> 44 #include <sys/time.h> 45 #include <sys/wait.h> 46 #include <errno.h> 47 #include <fcntl.h> 48 #include <paths.h> 49 #include <signal.h> 50 #include <stddef.h> 51 #include <stdlib.h> 52 #include <unistd.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 "exec.h" 61 #include "show.h" 62 #include "main.h" 63 #include "parser.h" 64 #include "nodes.h" 65 #include "jobs.h" 66 #include "options.h" 67 #include "trap.h" 68 #include "syntax.h" 69 #include "input.h" 70 #include "output.h" 71 #include "memalloc.h" 72 #include "error.h" 73 #include "mystring.h" 74 #include "var.h" 75 #include "builtins.h" 76 #include "eval.h" 77 78 79 /* 80 * A job structure contains information about a job. A job is either a 81 * single process or a set of processes contained in a pipeline. In the 82 * latter case, pidlist will be non-NULL, and will point to a -1 terminated 83 * array of pids. 84 */ 85 86 struct procstat { 87 pid_t pid; /* process id */ 88 int status; /* status flags (defined above) */ 89 char *cmd; /* text of command being run */ 90 }; 91 92 93 /* states */ 94 #define JOBSTOPPED 1 /* all procs are stopped */ 95 #define JOBDONE 2 /* all procs are completed */ 96 97 98 struct job { 99 struct procstat ps0; /* status of process */ 100 struct procstat *ps; /* status or processes when more than one */ 101 short nprocs; /* number of processes */ 102 pid_t pgrp; /* process group of this job */ 103 char state; /* true if job is finished */ 104 char used; /* true if this entry is in used */ 105 char changed; /* true if status has changed */ 106 char foreground; /* true if running in the foreground */ 107 char remembered; /* true if $! referenced */ 108 char pipefail; /* pass any non-zero status */ 109 #if JOBS 110 char jobctl; /* job running under job control */ 111 struct job *next; /* job used after this one */ 112 #endif 113 }; 114 115 116 static struct job *jobtab; /* array of jobs */ 117 static int njobs; /* size of array */ 118 static pid_t backgndpid = -1; /* pid of last background process */ 119 static struct job *bgjob = NULL; /* last background process */ 120 #if JOBS 121 static struct job *jobmru; /* most recently used job list */ 122 static pid_t initialpgrp; /* pgrp of shell on invocation */ 123 #endif 124 static int ttyfd = -1; 125 126 /* mode flags for dowait */ 127 #define DOWAIT_BLOCK 0x1 /* wait until a child exits */ 128 #define DOWAIT_SIG 0x2 /* if DOWAIT_BLOCK, abort on signal */ 129 #define DOWAIT_SIG_TRAP 0x4 /* if DOWAIT_SIG, abort on trapped signal only */ 130 131 #if JOBS 132 static void restartjob(struct job *); 133 #endif 134 static void freejob(struct job *); 135 static int waitcmdloop(struct job *); 136 static struct job *getjob_nonotfound(const char *); 137 static struct job *getjob(const char *); 138 pid_t killjob(const char *, int); 139 static pid_t dowait(int, struct job *); 140 static void checkzombies(void); 141 static void cmdtxt(union node *); 142 static void cmdputs(const char *); 143 #if JOBS 144 static void setcurjob(struct job *); 145 static void deljob(struct job *); 146 static struct job *getcurjob(struct job *); 147 #endif 148 static int getjobstatus(const struct job *); 149 static void printjobcmd(struct job *); 150 static void showjob(struct job *, int); 151 152 153 /* 154 * Turn job control on and off. 155 */ 156 157 static int jobctl; 158 159 #if JOBS 160 static void 161 jobctl_notty(void) 162 { 163 if (ttyfd >= 0) { 164 close(ttyfd); 165 ttyfd = -1; 166 } 167 if (!iflag) { 168 setsignal(SIGTSTP); 169 setsignal(SIGTTOU); 170 setsignal(SIGTTIN); 171 jobctl = 1; 172 return; 173 } 174 out2fmt_flush("sh: can't access tty; job control turned off\n"); 175 mflag = 0; 176 } 177 178 void 179 setjobctl(int on) 180 { 181 int i; 182 183 if (on == jobctl || rootshell == 0) 184 return; 185 if (on) { 186 if (ttyfd != -1) 187 close(ttyfd); 188 if ((ttyfd = open(_PATH_TTY, O_RDWR | O_CLOEXEC_MAYBE)) < 0) { 189 i = 0; 190 while (i <= 2 && !isatty(i)) 191 i++; 192 if (i > 2 || 193 (ttyfd = fcntl(i, F_DUPFD_CLOEXEC_MAYBE, 10)) < 0) { 194 jobctl_notty(); 195 return; 196 } 197 } 198 if (ttyfd < 10) { 199 /* 200 * Keep our TTY file descriptor out of the way of 201 * the user's redirections. 202 */ 203 if ((i = fcntl(ttyfd, F_DUPFD_CLOEXEC_MAYBE, 10)) < 0) { 204 jobctl_notty(); 205 return; 206 } 207 close(ttyfd); 208 ttyfd = i; 209 } 210 #if !defined(O_CLOEXEC) || !defined(F_DUPFD_CLOEXEC) 211 if (fcntl(ttyfd, F_SETFD, FD_CLOEXEC) < 0) { 212 close(ttyfd); 213 ttyfd = -1; 214 goto out; 215 } 216 #endif 217 do { /* while we are in the background */ 218 initialpgrp = tcgetpgrp(ttyfd); 219 if (initialpgrp < 0) { 220 #if !defined(O_CLOEXEC) || !defined(F_DUPFD_CLOEXEC) 221 out: 222 #endif 223 jobctl_notty(); 224 return; 225 } 226 if (initialpgrp != getpgrp()) { 227 if (!iflag) { 228 initialpgrp = -1; 229 jobctl_notty(); 230 return; 231 } 232 kill(0, SIGTTIN); 233 continue; 234 } 235 } while (0); 236 setsignal(SIGTSTP); 237 setsignal(SIGTTOU); 238 setsignal(SIGTTIN); 239 setpgid(0, rootpid); 240 tcsetpgrp(ttyfd, rootpid); 241 } else { /* turning job control off */ 242 setpgid(0, initialpgrp); 243 if (ttyfd >= 0) { 244 tcsetpgrp(ttyfd, initialpgrp); 245 close(ttyfd); 246 ttyfd = -1; 247 } 248 setsignal(SIGTSTP); 249 setsignal(SIGTTOU); 250 setsignal(SIGTTIN); 251 } 252 jobctl = on; 253 } 254 #endif 255 256 257 #if JOBS 258 int 259 fgcmd(int argc __unused, char **argv __unused) 260 { 261 struct job *jp; 262 pid_t pgrp; 263 int status; 264 265 nextopt(""); 266 jp = getjob(*argptr); 267 if (jp->jobctl == 0) 268 error("job not created under job control"); 269 printjobcmd(jp); 270 flushout(&output); 271 pgrp = jp->ps[0].pid; 272 if (ttyfd >= 0) 273 tcsetpgrp(ttyfd, pgrp); 274 restartjob(jp); 275 jp->foreground = 1; 276 INTOFF; 277 status = waitforjob(jp, (int *)NULL); 278 INTON; 279 return status; 280 } 281 282 283 int 284 bgcmd(int argc __unused, char **argv __unused) 285 { 286 struct job *jp; 287 288 nextopt(""); 289 do { 290 jp = getjob(*argptr); 291 if (jp->jobctl == 0) 292 error("job not created under job control"); 293 if (jp->state == JOBDONE) 294 continue; 295 restartjob(jp); 296 jp->foreground = 0; 297 out1fmt("[%td] ", jp - jobtab + 1); 298 printjobcmd(jp); 299 } while (*argptr != NULL && *++argptr != NULL); 300 return 0; 301 } 302 303 304 static void 305 restartjob(struct job *jp) 306 { 307 struct procstat *ps; 308 int i; 309 310 if (jp->state == JOBDONE) 311 return; 312 setcurjob(jp); 313 INTOFF; 314 kill(-jp->ps[0].pid, SIGCONT); 315 for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { 316 if (WIFSTOPPED(ps->status)) { 317 ps->status = -1; 318 jp->state = 0; 319 } 320 } 321 INTON; 322 } 323 #endif 324 325 326 int 327 jobscmd(int argc __unused, char *argv[] __unused) 328 { 329 char *id; 330 int ch, mode; 331 332 mode = SHOWJOBS_DEFAULT; 333 while ((ch = nextopt("lps")) != '\0') { 334 switch (ch) { 335 case 'l': 336 mode = SHOWJOBS_VERBOSE; 337 break; 338 case 'p': 339 mode = SHOWJOBS_PGIDS; 340 break; 341 case 's': 342 mode = SHOWJOBS_PIDS; 343 break; 344 } 345 } 346 347 if (*argptr == NULL) 348 showjobs(0, mode); 349 else 350 while ((id = *argptr++) != NULL) 351 showjob(getjob(id), mode); 352 353 return (0); 354 } 355 356 static int getjobstatus(const struct job *jp) 357 { 358 int i, status; 359 360 if (!jp->pipefail) 361 return (jp->ps[jp->nprocs - 1].status); 362 for (i = jp->nprocs - 1; i >= 0; i--) { 363 status = jp->ps[i].status; 364 if (status != 0) 365 return (status); 366 } 367 return (0); 368 } 369 370 static void 371 printjobcmd(struct job *jp) 372 { 373 struct procstat *ps; 374 int i; 375 376 for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { 377 out1str(ps->cmd); 378 if (i > 0) 379 out1str(" | "); 380 } 381 out1c('\n'); 382 } 383 384 static void 385 showjob(struct job *jp, int mode) 386 { 387 char s[64]; 388 char statebuf[16]; 389 const char *statestr, *coredump; 390 struct procstat *ps; 391 struct job *j; 392 int col, curr, i, jobno, prev, procno, status; 393 char c; 394 395 procno = (mode == SHOWJOBS_PGIDS) ? 1 : jp->nprocs; 396 jobno = jp - jobtab + 1; 397 curr = prev = 0; 398 #if JOBS 399 if ((j = getcurjob(NULL)) != NULL) { 400 curr = j - jobtab + 1; 401 if ((j = getcurjob(j)) != NULL) 402 prev = j - jobtab + 1; 403 } 404 #endif 405 coredump = ""; 406 status = getjobstatus(jp); 407 if (jp->state == 0) { 408 statestr = "Running"; 409 #if JOBS 410 } else if (jp->state == JOBSTOPPED) { 411 ps = jp->ps + jp->nprocs - 1; 412 while (!WIFSTOPPED(ps->status) && ps > jp->ps) 413 ps--; 414 if (WIFSTOPPED(ps->status)) 415 i = WSTOPSIG(ps->status); 416 else 417 i = -1; 418 statestr = strsignal(i); 419 if (statestr == NULL) 420 statestr = "Suspended"; 421 #endif 422 } else if (WIFEXITED(status)) { 423 if (WEXITSTATUS(status) == 0) 424 statestr = "Done"; 425 else { 426 fmtstr(statebuf, sizeof(statebuf), "Done(%d)", 427 WEXITSTATUS(status)); 428 statestr = statebuf; 429 } 430 } else { 431 i = WTERMSIG(status); 432 statestr = strsignal(i); 433 if (statestr == NULL) 434 statestr = "Unknown signal"; 435 if (WCOREDUMP(status)) 436 coredump = " (core dumped)"; 437 } 438 439 for (ps = jp->ps ; procno > 0 ; ps++, procno--) { /* for each process */ 440 if (mode == SHOWJOBS_PIDS || mode == SHOWJOBS_PGIDS) { 441 out1fmt("%d\n", (int)ps->pid); 442 continue; 443 } 444 if (mode != SHOWJOBS_VERBOSE && ps != jp->ps) 445 continue; 446 if (jobno == curr && ps == jp->ps) 447 c = '+'; 448 else if (jobno == prev && ps == jp->ps) 449 c = '-'; 450 else 451 c = ' '; 452 if (ps == jp->ps) 453 fmtstr(s, 64, "[%d] %c ", jobno, c); 454 else 455 fmtstr(s, 64, " %c ", c); 456 out1str(s); 457 col = strlen(s); 458 if (mode == SHOWJOBS_VERBOSE) { 459 fmtstr(s, 64, "%d ", (int)ps->pid); 460 out1str(s); 461 col += strlen(s); 462 } 463 if (ps == jp->ps) { 464 out1str(statestr); 465 out1str(coredump); 466 col += strlen(statestr) + strlen(coredump); 467 } 468 do { 469 out1c(' '); 470 col++; 471 } while (col < 30); 472 if (mode == SHOWJOBS_VERBOSE) { 473 out1str(ps->cmd); 474 out1c('\n'); 475 } else 476 printjobcmd(jp); 477 } 478 } 479 480 /* 481 * Print a list of jobs. If "change" is nonzero, only print jobs whose 482 * statuses have changed since the last call to showjobs. 483 * 484 * If the shell is interrupted in the process of creating a job, the 485 * result may be a job structure containing zero processes. Such structures 486 * will be freed here. 487 */ 488 489 void 490 showjobs(int change, int mode) 491 { 492 int jobno; 493 struct job *jp; 494 495 TRACE(("showjobs(%d) called\n", change)); 496 checkzombies(); 497 for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) { 498 if (! jp->used) 499 continue; 500 if (jp->nprocs == 0) { 501 freejob(jp); 502 continue; 503 } 504 if (change && ! jp->changed) 505 continue; 506 showjob(jp, mode); 507 if (mode == SHOWJOBS_DEFAULT || mode == SHOWJOBS_VERBOSE) { 508 jp->changed = 0; 509 /* Hack: discard jobs for which $! has not been 510 * referenced in interactive mode when they terminate. 511 */ 512 if (jp->state == JOBDONE && !jp->remembered && 513 (iflag || jp != bgjob)) { 514 freejob(jp); 515 } 516 } 517 } 518 } 519 520 521 /* 522 * Mark a job structure as unused. 523 */ 524 525 static void 526 freejob(struct job *jp) 527 { 528 struct procstat *ps; 529 int i; 530 531 INTOFF; 532 if (bgjob == jp) 533 bgjob = NULL; 534 for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) { 535 if (ps->cmd != nullstr) 536 ckfree(ps->cmd); 537 } 538 if (jp->ps != &jp->ps0) 539 ckfree(jp->ps); 540 jp->used = 0; 541 #if JOBS 542 deljob(jp); 543 #endif 544 INTON; 545 } 546 547 548 549 int 550 waitcmd(int argc __unused, char **argv __unused) 551 { 552 struct job *job; 553 int retval; 554 555 nextopt(""); 556 if (*argptr == NULL) 557 return (waitcmdloop(NULL)); 558 559 do { 560 job = getjob_nonotfound(*argptr); 561 if (job == NULL) 562 retval = 127; 563 else 564 retval = waitcmdloop(job); 565 argptr++; 566 } while (*argptr != NULL); 567 568 return (retval); 569 } 570 571 static int 572 waitcmdloop(struct job *job) 573 { 574 int status, retval, sig; 575 struct job *jp; 576 577 /* 578 * Loop until a process is terminated or stopped, or a SIGINT is 579 * received. 580 */ 581 582 do { 583 if (job != NULL) { 584 if (job->state == JOBDONE) { 585 status = getjobstatus(job); 586 if (WIFEXITED(status)) 587 retval = WEXITSTATUS(status); 588 else 589 retval = WTERMSIG(status) + 128; 590 if (! iflag || ! job->changed) 591 freejob(job); 592 else { 593 job->remembered = 0; 594 if (job == bgjob) 595 bgjob = NULL; 596 } 597 return retval; 598 } 599 } else { 600 for (jp = jobtab ; jp < jobtab + njobs; jp++) 601 if (jp->used && jp->state == JOBDONE) { 602 if (! iflag || ! jp->changed) 603 freejob(jp); 604 else { 605 jp->remembered = 0; 606 if (jp == bgjob) 607 bgjob = NULL; 608 } 609 } 610 for (jp = jobtab ; ; jp++) { 611 if (jp >= jobtab + njobs) { /* no running procs */ 612 return 0; 613 } 614 if (jp->used && jp->state == 0) 615 break; 616 } 617 } 618 } while (dowait(DOWAIT_BLOCK | DOWAIT_SIG, (struct job *)NULL) != -1); 619 620 sig = pendingsig_waitcmd; 621 pendingsig_waitcmd = 0; 622 return sig + 128; 623 } 624 625 626 627 int 628 jobidcmd(int argc __unused, char **argv __unused) 629 { 630 struct job *jp; 631 int i; 632 633 nextopt(""); 634 jp = getjob(*argptr); 635 for (i = 0 ; i < jp->nprocs ; ) { 636 out1fmt("%d", (int)jp->ps[i].pid); 637 out1c(++i < jp->nprocs? ' ' : '\n'); 638 } 639 return 0; 640 } 641 642 643 644 /* 645 * Convert a job name to a job structure. 646 */ 647 648 static struct job * 649 getjob_nonotfound(const char *name) 650 { 651 int jobno; 652 struct job *found, *jp; 653 size_t namelen; 654 pid_t pid; 655 int i; 656 657 if (name == NULL) { 658 #if JOBS 659 name = "%+"; 660 #else 661 error("No current job"); 662 #endif 663 } 664 if (name[0] == '%') { 665 if (is_digit(name[1])) { 666 jobno = number(name + 1); 667 if (jobno > 0 && jobno <= njobs 668 && jobtab[jobno - 1].used != 0) 669 return &jobtab[jobno - 1]; 670 #if JOBS 671 } else if ((name[1] == '%' || name[1] == '+') && 672 name[2] == '\0') { 673 if ((jp = getcurjob(NULL)) == NULL) 674 error("No current job"); 675 return (jp); 676 } else if (name[1] == '-' && name[2] == '\0') { 677 if ((jp = getcurjob(NULL)) == NULL || 678 (jp = getcurjob(jp)) == NULL) 679 error("No previous job"); 680 return (jp); 681 #endif 682 } else if (name[1] == '?') { 683 found = NULL; 684 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 685 if (jp->used && jp->nprocs > 0 686 && strstr(jp->ps[0].cmd, name + 2) != NULL) { 687 if (found) 688 error("%s: ambiguous", name); 689 found = jp; 690 } 691 } 692 if (found != NULL) 693 return (found); 694 } else { 695 namelen = strlen(name); 696 found = NULL; 697 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 698 if (jp->used && jp->nprocs > 0 699 && strncmp(jp->ps[0].cmd, name + 1, 700 namelen - 1) == 0) { 701 if (found) 702 error("%s: ambiguous", name); 703 found = jp; 704 } 705 } 706 if (found) 707 return found; 708 } 709 } else if (is_number(name)) { 710 pid = (pid_t)number(name); 711 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 712 if (jp->used && jp->nprocs > 0 713 && jp->ps[jp->nprocs - 1].pid == pid) 714 return jp; 715 } 716 } 717 return NULL; 718 } 719 720 721 static struct job * 722 getjob(const char *name) 723 { 724 struct job *jp; 725 726 jp = getjob_nonotfound(name); 727 if (jp == NULL) 728 error("No such job: %s", name); 729 return (jp); 730 } 731 732 733 int 734 killjob(const char *name, int sig) 735 { 736 struct job *jp; 737 int i, ret; 738 739 jp = getjob(name); 740 if (jp->state == JOBDONE) 741 return 0; 742 if (jp->jobctl) 743 return kill(-jp->ps[0].pid, sig); 744 ret = -1; 745 errno = ESRCH; 746 for (i = 0; i < jp->nprocs; i++) 747 if (jp->ps[i].status == -1 || WIFSTOPPED(jp->ps[i].status)) { 748 if (kill(jp->ps[i].pid, sig) == 0) 749 ret = 0; 750 } else 751 ret = 0; 752 return ret; 753 } 754 755 /* 756 * Return a new job structure, 757 */ 758 759 struct job * 760 makejob(union node *node __unused, int nprocs) 761 { 762 int i; 763 struct job *jp; 764 765 for (i = njobs, jp = jobtab ; ; jp++) { 766 if (--i < 0) { 767 INTOFF; 768 if (njobs == 0) { 769 jobtab = ckmalloc(4 * sizeof jobtab[0]); 770 #if JOBS 771 jobmru = NULL; 772 #endif 773 } else { 774 jp = ckmalloc((njobs + 4) * sizeof jobtab[0]); 775 memcpy(jp, jobtab, njobs * sizeof jp[0]); 776 #if JOBS 777 /* Relocate `next' pointers and list head */ 778 if (jobmru != NULL) 779 jobmru = &jp[jobmru - jobtab]; 780 for (i = 0; i < njobs; i++) 781 if (jp[i].next != NULL) 782 jp[i].next = &jp[jp[i].next - 783 jobtab]; 784 #endif 785 if (bgjob != NULL) 786 bgjob = &jp[bgjob - jobtab]; 787 /* Relocate `ps' pointers */ 788 for (i = 0; i < njobs; i++) 789 if (jp[i].ps == &jobtab[i].ps0) 790 jp[i].ps = &jp[i].ps0; 791 ckfree(jobtab); 792 jobtab = jp; 793 } 794 jp = jobtab + njobs; 795 for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0) 796 ; 797 INTON; 798 break; 799 } 800 if (jp->used == 0) 801 break; 802 } 803 INTOFF; 804 jp->state = 0; 805 jp->used = 1; 806 jp->changed = 0; 807 jp->nprocs = 0; 808 jp->foreground = 0; 809 jp->remembered = 0; 810 jp->pipefail = pipefailflag; 811 #if JOBS 812 jp->jobctl = jobctl; 813 jp->next = NULL; 814 #endif 815 if (nprocs > 1) { 816 jp->ps = ckmalloc(nprocs * sizeof (struct procstat)); 817 } else { 818 jp->ps = &jp->ps0; 819 } 820 INTON; 821 TRACE(("makejob(%p, %d) returns %%%td\n", (void *)node, nprocs, 822 jp - jobtab + 1)); 823 return jp; 824 } 825 826 #if JOBS 827 static void 828 setcurjob(struct job *cj) 829 { 830 struct job *jp, *prev; 831 832 for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) { 833 if (jp == cj) { 834 if (prev != NULL) 835 prev->next = jp->next; 836 else 837 jobmru = jp->next; 838 jp->next = jobmru; 839 jobmru = cj; 840 return; 841 } 842 } 843 cj->next = jobmru; 844 jobmru = cj; 845 } 846 847 static void 848 deljob(struct job *j) 849 { 850 struct job *jp, *prev; 851 852 for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) { 853 if (jp == j) { 854 if (prev != NULL) 855 prev->next = jp->next; 856 else 857 jobmru = jp->next; 858 return; 859 } 860 } 861 } 862 863 /* 864 * Return the most recently used job that isn't `nj', and preferably one 865 * that is stopped. 866 */ 867 static struct job * 868 getcurjob(struct job *nj) 869 { 870 struct job *jp; 871 872 /* Try to find a stopped one.. */ 873 for (jp = jobmru; jp != NULL; jp = jp->next) 874 if (jp->used && jp != nj && jp->state == JOBSTOPPED) 875 return (jp); 876 /* Otherwise the most recently used job that isn't `nj' */ 877 for (jp = jobmru; jp != NULL; jp = jp->next) 878 if (jp->used && jp != nj) 879 return (jp); 880 881 return (NULL); 882 } 883 884 #endif 885 886 /* 887 * Fork of a subshell. If we are doing job control, give the subshell its 888 * own process group. Jp is a job structure that the job is to be added to. 889 * N is the command that will be evaluated by the child. Both jp and n may 890 * be NULL. The mode parameter can be one of the following: 891 * FORK_FG - Fork off a foreground process. 892 * FORK_BG - Fork off a background process. 893 * FORK_NOJOB - Like FORK_FG, but don't give the process its own 894 * process group even if job control is on. 895 * 896 * When job control is turned off, background processes have their standard 897 * input redirected to /dev/null (except for the second and later processes 898 * in a pipeline). 899 */ 900 901 pid_t 902 forkshell(struct job *jp, union node *n, int mode) 903 { 904 pid_t pid; 905 pid_t pgrp; 906 907 TRACE(("forkshell(%%%td, %p, %d) called\n", jp - jobtab, (void *)n, 908 mode)); 909 INTOFF; 910 if (mode == FORK_BG && (jp == NULL || jp->nprocs == 0)) 911 checkzombies(); 912 flushall(); 913 pid = fork(); 914 if (pid == -1) { 915 TRACE(("Fork failed, errno=%d\n", errno)); 916 INTON; 917 error("Cannot fork: %s", strerror(errno)); 918 } 919 if (pid == 0) { 920 struct job *p; 921 int wasroot; 922 int i; 923 924 TRACE(("Child shell %d\n", (int)getpid())); 925 wasroot = rootshell; 926 rootshell = 0; 927 handler = &main_handler; 928 closescript(); 929 INTON; 930 forcelocal = 0; 931 clear_traps(); 932 #if JOBS 933 jobctl = 0; /* do job control only in root shell */ 934 if (wasroot && mode != FORK_NOJOB && mflag) { 935 if (jp == NULL || jp->nprocs == 0) 936 pgrp = getpid(); 937 else 938 pgrp = jp->ps[0].pid; 939 if (setpgid(0, pgrp) == 0 && mode == FORK_FG && 940 ttyfd >= 0) { 941 /*** this causes superfluous TIOCSPGRPS ***/ 942 if (tcsetpgrp(ttyfd, pgrp) < 0) 943 error("tcsetpgrp failed, errno=%d", errno); 944 } 945 setsignal(SIGTSTP); 946 setsignal(SIGTTOU); 947 } else if (mode == FORK_BG) { 948 ignoresig(SIGINT); 949 ignoresig(SIGQUIT); 950 if ((jp == NULL || jp->nprocs == 0) && 951 ! fd0_redirected_p ()) { 952 close(0); 953 if (open(_PATH_DEVNULL, O_RDONLY) != 0) 954 error("cannot open %s: %s", 955 _PATH_DEVNULL, strerror(errno)); 956 } 957 } 958 #else 959 if (mode == FORK_BG) { 960 ignoresig(SIGINT); 961 ignoresig(SIGQUIT); 962 if ((jp == NULL || jp->nprocs == 0) && 963 ! fd0_redirected_p ()) { 964 close(0); 965 if (open(_PATH_DEVNULL, O_RDONLY) != 0) 966 error("cannot open %s: %s", 967 _PATH_DEVNULL, strerror(errno)); 968 } 969 } 970 #endif 971 INTOFF; 972 for (i = njobs, p = jobtab ; --i >= 0 ; p++) 973 if (p->used) 974 freejob(p); 975 INTON; 976 if (wasroot && iflag) { 977 setsignal(SIGINT); 978 setsignal(SIGQUIT); 979 setsignal(SIGTERM); 980 } 981 return pid; 982 } 983 if (rootshell && mode != FORK_NOJOB && mflag) { 984 if (jp == NULL || jp->nprocs == 0) 985 pgrp = pid; 986 else 987 pgrp = jp->ps[0].pid; 988 setpgid(pid, pgrp); 989 } 990 if (mode == FORK_BG) { 991 if (bgjob != NULL && bgjob->state == JOBDONE && 992 !bgjob->remembered && !iflag) 993 freejob(bgjob); 994 backgndpid = pid; /* set $! */ 995 bgjob = jp; 996 } 997 if (jp) { 998 struct procstat *ps = &jp->ps[jp->nprocs++]; 999 ps->pid = pid; 1000 ps->status = -1; 1001 ps->cmd = nullstr; 1002 if (iflag && rootshell && n) 1003 ps->cmd = commandtext(n); 1004 jp->foreground = mode == FORK_FG; 1005 #if JOBS 1006 setcurjob(jp); 1007 #endif 1008 } 1009 INTON; 1010 TRACE(("In parent shell: child = %d\n", (int)pid)); 1011 return pid; 1012 } 1013 1014 1015 pid_t 1016 vforkexecshell(struct job *jp, char **argv, char **envp, const char *path, int idx, int pip[2]) 1017 { 1018 pid_t pid; 1019 struct jmploc jmploc; 1020 struct jmploc *savehandler; 1021 int inton; 1022 1023 TRACE(("vforkexecshell(%%%td, %s, %p) called\n", jp - jobtab, argv[0], 1024 (void *)pip)); 1025 inton = is_int_on(); 1026 INTOFF; 1027 flushall(); 1028 savehandler = handler; 1029 pid = vfork(); 1030 if (pid == -1) { 1031 TRACE(("Vfork failed, errno=%d\n", errno)); 1032 INTON; 1033 error("Cannot fork: %s", strerror(errno)); 1034 } 1035 if (pid == 0) { 1036 TRACE(("Child shell %d\n", (int)getpid())); 1037 if (setjmp(jmploc.loc)) 1038 _exit(exitstatus); 1039 if (pip != NULL) { 1040 close(pip[0]); 1041 if (pip[1] != 1) { 1042 dup2(pip[1], 1); 1043 close(pip[1]); 1044 } 1045 } 1046 handler = &jmploc; 1047 shellexec(argv, envp, path, idx); 1048 } 1049 handler = savehandler; 1050 if (jp) { 1051 struct procstat *ps = &jp->ps[jp->nprocs++]; 1052 ps->pid = pid; 1053 ps->status = -1; 1054 ps->cmd = nullstr; 1055 jp->foreground = 1; 1056 #if JOBS 1057 setcurjob(jp); 1058 #endif 1059 } 1060 SETINTON(inton); 1061 TRACE(("In parent shell: child = %d\n", (int)pid)); 1062 return pid; 1063 } 1064 1065 1066 /* 1067 * Wait for job to finish. 1068 * 1069 * Under job control we have the problem that while a child process is 1070 * running interrupts generated by the user are sent to the child but not 1071 * to the shell. This means that an infinite loop started by an inter- 1072 * active user may be hard to kill. With job control turned off, an 1073 * interactive user may place an interactive program inside a loop. If 1074 * the interactive program catches interrupts, the user doesn't want 1075 * these interrupts to also abort the loop. The approach we take here 1076 * is to have the shell ignore interrupt signals while waiting for a 1077 * foreground process to terminate, and then send itself an interrupt 1078 * signal if the child process was terminated by an interrupt signal. 1079 * Unfortunately, some programs want to do a bit of cleanup and then 1080 * exit on interrupt; unless these processes terminate themselves by 1081 * sending a signal to themselves (instead of calling exit) they will 1082 * confuse this approach. 1083 */ 1084 1085 int 1086 waitforjob(struct job *jp, int *signaled) 1087 { 1088 #if JOBS 1089 int propagate_int = jp->jobctl && jp->foreground; 1090 #endif 1091 int status; 1092 int st; 1093 1094 INTOFF; 1095 TRACE(("waitforjob(%%%td) called\n", jp - jobtab + 1)); 1096 while (jp->state == 0) 1097 if (dowait(DOWAIT_BLOCK | (Tflag ? DOWAIT_SIG | 1098 DOWAIT_SIG_TRAP : 0), jp) == -1) 1099 dotrap(); 1100 #if JOBS 1101 if (jp->jobctl) { 1102 if (ttyfd >= 0 && tcsetpgrp(ttyfd, rootpid) < 0) 1103 error("tcsetpgrp failed, errno=%d\n", errno); 1104 } 1105 if (jp->state == JOBSTOPPED) 1106 setcurjob(jp); 1107 #endif 1108 status = getjobstatus(jp); 1109 if (signaled != NULL) 1110 *signaled = WIFSIGNALED(status); 1111 /* convert to 8 bits */ 1112 if (WIFEXITED(status)) 1113 st = WEXITSTATUS(status); 1114 #if JOBS 1115 else if (WIFSTOPPED(status)) 1116 st = WSTOPSIG(status) + 128; 1117 #endif 1118 else 1119 st = WTERMSIG(status) + 128; 1120 if (! JOBS || jp->state == JOBDONE) 1121 freejob(jp); 1122 if (int_pending()) { 1123 if (!WIFSIGNALED(status) || WTERMSIG(status) != SIGINT) 1124 CLEAR_PENDING_INT; 1125 } 1126 #if JOBS 1127 else if (rootshell && propagate_int && 1128 WIFSIGNALED(status) && WTERMSIG(status) == SIGINT) 1129 kill(getpid(), SIGINT); 1130 #endif 1131 INTON; 1132 return st; 1133 } 1134 1135 1136 static void 1137 dummy_handler(int sig __unused) 1138 { 1139 } 1140 1141 /* 1142 * Wait for a process to terminate. 1143 */ 1144 1145 static pid_t 1146 dowait(int mode, struct job *job) 1147 { 1148 struct sigaction sa, osa; 1149 sigset_t mask, omask; 1150 pid_t pid; 1151 int status; 1152 struct procstat *sp; 1153 struct job *jp; 1154 struct job *thisjob; 1155 const char *sigstr; 1156 int done; 1157 int stopped; 1158 int sig; 1159 int coredump; 1160 int wflags; 1161 int restore_sigchld; 1162 1163 TRACE(("dowait(%d, %p) called\n", mode, job)); 1164 restore_sigchld = 0; 1165 if ((mode & DOWAIT_SIG) != 0) { 1166 sigfillset(&mask); 1167 sigprocmask(SIG_BLOCK, &mask, &omask); 1168 INTOFF; 1169 if (!issigchldtrapped()) { 1170 restore_sigchld = 1; 1171 sa.sa_handler = dummy_handler; 1172 sa.sa_flags = 0; 1173 sigemptyset(&sa.sa_mask); 1174 sigaction(SIGCHLD, &sa, &osa); 1175 } 1176 } 1177 do { 1178 #if JOBS 1179 if (iflag) 1180 wflags = WUNTRACED | WCONTINUED; 1181 else 1182 #endif 1183 wflags = 0; 1184 if ((mode & (DOWAIT_BLOCK | DOWAIT_SIG)) != DOWAIT_BLOCK) 1185 wflags |= WNOHANG; 1186 pid = wait3(&status, wflags, (struct rusage *)NULL); 1187 TRACE(("wait returns %d, status=%d\n", (int)pid, status)); 1188 if (pid == 0 && (mode & DOWAIT_SIG) != 0) { 1189 pid = -1; 1190 if (((mode & DOWAIT_SIG_TRAP) != 0 ? 1191 pendingsig : pendingsig_waitcmd) != 0) { 1192 errno = EINTR; 1193 break; 1194 } 1195 sigsuspend(&omask); 1196 if (int_pending()) 1197 break; 1198 } 1199 } while (pid == -1 && errno == EINTR); 1200 if (pid == -1 && errno == ECHILD && job != NULL) 1201 job->state = JOBDONE; 1202 if ((mode & DOWAIT_SIG) != 0) { 1203 if (restore_sigchld) 1204 sigaction(SIGCHLD, &osa, NULL); 1205 sigprocmask(SIG_SETMASK, &omask, NULL); 1206 INTON; 1207 } 1208 if (pid <= 0) 1209 return pid; 1210 INTOFF; 1211 thisjob = NULL; 1212 for (jp = jobtab ; jp < jobtab + njobs ; jp++) { 1213 if (jp->used && jp->nprocs > 0) { 1214 done = 1; 1215 stopped = 1; 1216 for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) { 1217 if (sp->pid == -1) 1218 continue; 1219 if (sp->pid == pid && (sp->status == -1 || 1220 WIFSTOPPED(sp->status))) { 1221 TRACE(("Changing status of proc %d from 0x%x to 0x%x\n", 1222 (int)pid, sp->status, 1223 status)); 1224 if (WIFCONTINUED(status)) { 1225 sp->status = -1; 1226 jp->state = 0; 1227 } else 1228 sp->status = status; 1229 thisjob = jp; 1230 } 1231 if (sp->status == -1) 1232 stopped = 0; 1233 else if (WIFSTOPPED(sp->status)) 1234 done = 0; 1235 } 1236 if (stopped) { /* stopped or done */ 1237 int state = done? JOBDONE : JOBSTOPPED; 1238 if (jp->state != state) { 1239 TRACE(("Job %td: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state)); 1240 jp->state = state; 1241 if (jp != job) { 1242 if (done && !jp->remembered && 1243 !iflag && jp != bgjob) 1244 freejob(jp); 1245 #if JOBS 1246 else if (done) 1247 deljob(jp); 1248 #endif 1249 } 1250 } 1251 } 1252 } 1253 } 1254 INTON; 1255 if (!thisjob || thisjob->state == 0) 1256 ; 1257 else if ((!rootshell || !iflag || thisjob == job) && 1258 thisjob->foreground && thisjob->state != JOBSTOPPED) { 1259 sig = 0; 1260 coredump = 0; 1261 for (sp = thisjob->ps; sp < thisjob->ps + thisjob->nprocs; sp++) 1262 if (WIFSIGNALED(sp->status)) { 1263 sig = WTERMSIG(sp->status); 1264 coredump = WCOREDUMP(sp->status); 1265 } 1266 if (sig > 0 && sig != SIGINT && sig != SIGPIPE) { 1267 sigstr = strsignal(sig); 1268 if (sigstr != NULL) 1269 out2str(sigstr); 1270 else 1271 out2str("Unknown signal"); 1272 if (coredump) 1273 out2str(" (core dumped)"); 1274 out2c('\n'); 1275 flushout(out2); 1276 } 1277 } else { 1278 TRACE(("Not printing status, rootshell=%d, job=%p\n", rootshell, job)); 1279 thisjob->changed = 1; 1280 } 1281 return pid; 1282 } 1283 1284 1285 1286 /* 1287 * return 1 if there are stopped jobs, otherwise 0 1288 */ 1289 int job_warning = 0; 1290 int 1291 stoppedjobs(void) 1292 { 1293 int jobno; 1294 struct job *jp; 1295 1296 if (job_warning) 1297 return (0); 1298 for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) { 1299 if (jp->used == 0) 1300 continue; 1301 if (jp->state == JOBSTOPPED) { 1302 out2fmt_flush("You have stopped jobs.\n"); 1303 job_warning = 2; 1304 return (1); 1305 } 1306 } 1307 1308 return (0); 1309 } 1310 1311 1312 static void 1313 checkzombies(void) 1314 { 1315 while (njobs > 0 && dowait(0, NULL) > 0) 1316 ; 1317 } 1318 1319 1320 int 1321 backgndpidset(void) 1322 { 1323 return backgndpid != -1; 1324 } 1325 1326 1327 pid_t 1328 backgndpidval(void) 1329 { 1330 if (bgjob != NULL && !forcelocal) 1331 bgjob->remembered = 1; 1332 return backgndpid; 1333 } 1334 1335 /* 1336 * Return a string identifying a command (to be printed by the 1337 * jobs command. 1338 */ 1339 1340 static char *cmdnextc; 1341 static int cmdnleft; 1342 #define MAXCMDTEXT 200 1343 1344 char * 1345 commandtext(union node *n) 1346 { 1347 char *name; 1348 1349 cmdnextc = name = ckmalloc(MAXCMDTEXT); 1350 cmdnleft = MAXCMDTEXT - 4; 1351 cmdtxt(n); 1352 *cmdnextc = '\0'; 1353 return name; 1354 } 1355 1356 1357 static void 1358 cmdtxtdogroup(union node *n) 1359 { 1360 cmdputs("; do "); 1361 cmdtxt(n); 1362 cmdputs("; done"); 1363 } 1364 1365 1366 static void 1367 cmdtxtredir(union node *n, const char *op, int deffd) 1368 { 1369 char s[2]; 1370 1371 if (n->nfile.fd != deffd) { 1372 s[0] = n->nfile.fd + '0'; 1373 s[1] = '\0'; 1374 cmdputs(s); 1375 } 1376 cmdputs(op); 1377 if (n->type == NTOFD || n->type == NFROMFD) { 1378 if (n->ndup.dupfd >= 0) 1379 s[0] = n->ndup.dupfd + '0'; 1380 else 1381 s[0] = '-'; 1382 s[1] = '\0'; 1383 cmdputs(s); 1384 } else { 1385 cmdtxt(n->nfile.fname); 1386 } 1387 } 1388 1389 1390 static void 1391 cmdtxt(union node *n) 1392 { 1393 union node *np; 1394 struct nodelist *lp; 1395 1396 if (n == NULL) 1397 return; 1398 switch (n->type) { 1399 case NSEMI: 1400 cmdtxt(n->nbinary.ch1); 1401 cmdputs("; "); 1402 cmdtxt(n->nbinary.ch2); 1403 break; 1404 case NAND: 1405 cmdtxt(n->nbinary.ch1); 1406 cmdputs(" && "); 1407 cmdtxt(n->nbinary.ch2); 1408 break; 1409 case NOR: 1410 cmdtxt(n->nbinary.ch1); 1411 cmdputs(" || "); 1412 cmdtxt(n->nbinary.ch2); 1413 break; 1414 case NPIPE: 1415 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 1416 cmdtxt(lp->n); 1417 if (lp->next) 1418 cmdputs(" | "); 1419 } 1420 break; 1421 case NSUBSHELL: 1422 cmdputs("("); 1423 cmdtxt(n->nredir.n); 1424 cmdputs(")"); 1425 break; 1426 case NREDIR: 1427 case NBACKGND: 1428 cmdtxt(n->nredir.n); 1429 break; 1430 case NIF: 1431 cmdputs("if "); 1432 cmdtxt(n->nif.test); 1433 cmdputs("; then "); 1434 cmdtxt(n->nif.ifpart); 1435 cmdputs("..."); 1436 break; 1437 case NWHILE: 1438 cmdputs("while "); 1439 cmdtxt(n->nbinary.ch1); 1440 cmdtxtdogroup(n->nbinary.ch2); 1441 break; 1442 case NUNTIL: 1443 cmdputs("until "); 1444 cmdtxt(n->nbinary.ch1); 1445 cmdtxtdogroup(n->nbinary.ch2); 1446 break; 1447 case NFOR: 1448 cmdputs("for "); 1449 cmdputs(n->nfor.var); 1450 cmdputs(" in ..."); 1451 break; 1452 case NCASE: 1453 cmdputs("case "); 1454 cmdputs(n->ncase.expr->narg.text); 1455 cmdputs(" in ..."); 1456 break; 1457 case NDEFUN: 1458 cmdputs(n->narg.text); 1459 cmdputs("() ..."); 1460 break; 1461 case NNOT: 1462 cmdputs("! "); 1463 cmdtxt(n->nnot.com); 1464 break; 1465 case NCMD: 1466 for (np = n->ncmd.args ; np ; np = np->narg.next) { 1467 cmdtxt(np); 1468 if (np->narg.next) 1469 cmdputs(" "); 1470 } 1471 for (np = n->ncmd.redirect ; np ; np = np->nfile.next) { 1472 cmdputs(" "); 1473 cmdtxt(np); 1474 } 1475 break; 1476 case NARG: 1477 cmdputs(n->narg.text); 1478 break; 1479 case NTO: 1480 cmdtxtredir(n, ">", 1); 1481 break; 1482 case NAPPEND: 1483 cmdtxtredir(n, ">>", 1); 1484 break; 1485 case NTOFD: 1486 cmdtxtredir(n, ">&", 1); 1487 break; 1488 case NCLOBBER: 1489 cmdtxtredir(n, ">|", 1); 1490 break; 1491 case NFROM: 1492 cmdtxtredir(n, "<", 0); 1493 break; 1494 case NFROMTO: 1495 cmdtxtredir(n, "<>", 0); 1496 break; 1497 case NFROMFD: 1498 cmdtxtredir(n, "<&", 0); 1499 break; 1500 case NHERE: 1501 case NXHERE: 1502 cmdputs("<<..."); 1503 break; 1504 default: 1505 cmdputs("???"); 1506 break; 1507 } 1508 } 1509 1510 1511 1512 static void 1513 cmdputs(const char *s) 1514 { 1515 const char *p; 1516 char *q; 1517 char c; 1518 int subtype = 0; 1519 1520 if (cmdnleft <= 0) 1521 return; 1522 p = s; 1523 q = cmdnextc; 1524 while ((c = *p++) != '\0') { 1525 if (c == CTLESC) 1526 *q++ = *p++; 1527 else if (c == CTLVAR) { 1528 *q++ = '$'; 1529 if (--cmdnleft > 0) 1530 *q++ = '{'; 1531 subtype = *p++; 1532 if ((subtype & VSTYPE) == VSLENGTH && --cmdnleft > 0) 1533 *q++ = '#'; 1534 } else if (c == '=' && subtype != 0) { 1535 *q = "}-+?=##%%\0X"[(subtype & VSTYPE) - VSNORMAL]; 1536 if (*q) 1537 q++; 1538 else 1539 cmdnleft++; 1540 if (((subtype & VSTYPE) == VSTRIMLEFTMAX || 1541 (subtype & VSTYPE) == VSTRIMRIGHTMAX) && 1542 --cmdnleft > 0) 1543 *q = q[-1], q++; 1544 subtype = 0; 1545 } else if (c == CTLENDVAR) { 1546 *q++ = '}'; 1547 } else if (c == CTLBACKQ || c == CTLBACKQ+CTLQUOTE) { 1548 cmdnleft -= 5; 1549 if (cmdnleft > 0) { 1550 *q++ = '$'; 1551 *q++ = '('; 1552 *q++ = '.'; 1553 *q++ = '.'; 1554 *q++ = '.'; 1555 *q++ = ')'; 1556 } 1557 } else if (c == CTLARI) { 1558 cmdnleft -= 2; 1559 if (cmdnleft > 0) { 1560 *q++ = '$'; 1561 *q++ = '('; 1562 *q++ = '('; 1563 } 1564 p++; 1565 } else if (c == CTLENDARI) { 1566 if (--cmdnleft > 0) { 1567 *q++ = ')'; 1568 *q++ = ')'; 1569 } 1570 } else if (c == CTLQUOTEMARK || c == CTLQUOTEEND) 1571 cmdnleft++; /* ignore */ 1572 else 1573 *q++ = c; 1574 if (--cmdnleft <= 0) { 1575 *q++ = '.'; 1576 *q++ = '.'; 1577 *q++ = '.'; 1578 break; 1579 } 1580 } 1581 cmdnextc = q; 1582 } 1583