jobs.c revision 1.100
1 /* $NetBSD: jobs.c,v 1.100 2018/09/04 23:16:30 kre Exp $ */ 2 3 /*- 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Kenneth Almquist. 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 #include <sys/cdefs.h> 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)jobs.c 8.5 (Berkeley) 5/4/95"; 39 #else 40 __RCSID("$NetBSD: jobs.c,v 1.100 2018/09/04 23:16:30 kre Exp $"); 41 #endif 42 #endif /* not lint */ 43 44 #include <stdio.h> 45 #include <fcntl.h> 46 #include <signal.h> 47 #include <errno.h> 48 #include <unistd.h> 49 #include <stdlib.h> 50 #include <paths.h> 51 #include <sys/types.h> 52 #include <sys/param.h> 53 #ifdef BSD 54 #include <sys/wait.h> 55 #include <sys/time.h> 56 #include <sys/resource.h> 57 #endif 58 #include <sys/ioctl.h> 59 60 #include "shell.h" 61 #if JOBS 62 #if OLD_TTY_DRIVER 63 #include "sgtty.h" 64 #else 65 #include <termios.h> 66 #endif 67 #undef CEOF /* syntax.h redefines this */ 68 #endif 69 #include "redir.h" 70 #include "show.h" 71 #include "main.h" 72 #include "parser.h" 73 #include "nodes.h" 74 #include "jobs.h" 75 #include "var.h" 76 #include "options.h" 77 #include "builtins.h" 78 #include "trap.h" 79 #include "syntax.h" 80 #include "input.h" 81 #include "output.h" 82 #include "memalloc.h" 83 #include "error.h" 84 #include "mystring.h" 85 86 87 #ifndef WCONTINUED 88 #define WCONTINUED 0 /* So we can compile on old systems */ 89 #endif 90 #ifndef WIFCONTINUED 91 #define WIFCONTINUED(x) (0) /* ditto */ 92 #endif 93 94 95 static struct job *jobtab; /* array of jobs */ 96 static int njobs; /* size of array */ 97 static int jobs_invalid; /* set in child */ 98 MKINIT pid_t backgndpid = -1; /* pid of last background process */ 99 #if JOBS 100 int initialpgrp; /* pgrp of shell on invocation */ 101 static int curjob = -1; /* current job */ 102 #endif 103 static int ttyfd = -1; 104 105 STATIC void restartjob(struct job *); 106 STATIC void freejob(struct job *); 107 STATIC struct job *getjob(const char *, int); 108 STATIC int dowait(int, struct job *, struct job **); 109 #define WBLOCK 1 110 #define WNOFREE 2 111 #define WSILENT 4 112 STATIC int jobstatus(const struct job *, int); 113 STATIC int waitproc(int, struct job *, int *); 114 STATIC void cmdtxt(union node *); 115 STATIC void cmdlist(union node *, int); 116 STATIC void cmdputs(const char *); 117 inline static void cmdputi(int); 118 119 #ifdef SYSV 120 STATIC int onsigchild(void); 121 #endif 122 123 #ifdef OLD_TTY_DRIVER 124 static pid_t tcgetpgrp(int fd); 125 static int tcsetpgrp(int fd, pid_t pgrp); 126 127 static pid_t 128 tcgetpgrp(int fd) 129 { 130 pid_t pgrp; 131 if (ioctl(fd, TIOCGPGRP, (char *)&pgrp) == -1) 132 return -1; 133 else 134 return pgrp; 135 } 136 137 static int 138 tcsetpgrp(int fd, pid_tpgrp) 139 { 140 return ioctl(fd, TIOCSPGRP, (char *)&pgrp); 141 } 142 #endif 143 144 static void 145 ttyfd_change(int from, int to) 146 { 147 if (ttyfd == from) 148 ttyfd = to; 149 } 150 151 /* 152 * Turn job control on and off. 153 * 154 * Note: This code assumes that the third arg to ioctl is a character 155 * pointer, which is true on Berkeley systems but not System V. Since 156 * System V doesn't have job control yet, this isn't a problem now. 157 */ 158 159 MKINIT int jobctl; 160 161 void 162 setjobctl(int on) 163 { 164 #ifdef OLD_TTY_DRIVER 165 int ldisc; 166 #endif 167 168 if (on == jobctl || rootshell == 0) 169 return; 170 if (on) { 171 #if defined(FIOCLEX) || defined(FD_CLOEXEC) 172 int i; 173 174 if (ttyfd != -1) 175 sh_close(ttyfd); 176 if ((ttyfd = open("/dev/tty", O_RDWR)) == -1) { 177 for (i = 0; i < 3; i++) { 178 if (isatty(i) && (ttyfd = dup(i)) != -1) 179 break; 180 } 181 if (i == 3) 182 goto out; 183 } 184 ttyfd = to_upper_fd(ttyfd); /* Move to a high fd */ 185 register_sh_fd(ttyfd, ttyfd_change); 186 #else 187 out2str("sh: Need FIOCLEX or FD_CLOEXEC to support job control"); 188 goto out; 189 #endif 190 do { /* while we are in the background */ 191 if ((initialpgrp = tcgetpgrp(ttyfd)) < 0) { 192 out: 193 out2str("sh: can't access tty; job control turned off\n"); 194 mflag = 0; 195 return; 196 } 197 if (initialpgrp == -1) 198 initialpgrp = getpgrp(); 199 else if (initialpgrp != getpgrp()) { 200 killpg(0, SIGTTIN); 201 continue; 202 } 203 } while (0); 204 205 #ifdef OLD_TTY_DRIVER 206 if (ioctl(ttyfd, TIOCGETD, (char *)&ldisc) < 0 207 || ldisc != NTTYDISC) { 208 out2str("sh: need new tty driver to run job control; job control turned off\n"); 209 mflag = 0; 210 return; 211 } 212 #endif 213 setsignal(SIGTSTP, 0); 214 setsignal(SIGTTOU, 0); 215 setsignal(SIGTTIN, 0); 216 if (getpgrp() != rootpid && setpgid(0, rootpid) == -1) 217 error("Cannot set process group (%s) at %d", 218 strerror(errno), __LINE__); 219 if (tcsetpgrp(ttyfd, rootpid) == -1) 220 error("Cannot set tty process group (%s) at %d", 221 strerror(errno), __LINE__); 222 } else { /* turning job control off */ 223 if (getpgrp() != initialpgrp && setpgid(0, initialpgrp) == -1) 224 error("Cannot set process group (%s) at %d", 225 strerror(errno), __LINE__); 226 if (tcsetpgrp(ttyfd, initialpgrp) == -1) 227 error("Cannot set tty process group (%s) at %d", 228 strerror(errno), __LINE__); 229 sh_close(ttyfd); 230 ttyfd = -1; 231 setsignal(SIGTSTP, 0); 232 setsignal(SIGTTOU, 0); 233 setsignal(SIGTTIN, 0); 234 } 235 jobctl = on; 236 } 237 238 239 #ifdef mkinit 240 INCLUDE <stdlib.h> 241 242 SHELLPROC { 243 backgndpid = -1; 244 #if JOBS 245 jobctl = 0; 246 #endif 247 } 248 249 #endif 250 251 252 253 #if JOBS 254 static int 255 do_fgcmd(const char *arg_ptr) 256 { 257 struct job *jp; 258 int i; 259 int status; 260 261 if (jobs_invalid) 262 error("No current jobs"); 263 jp = getjob(arg_ptr, 0); 264 if (jp->jobctl == 0) 265 error("job not created under job control"); 266 out1fmt("%s", jp->ps[0].cmd); 267 for (i = 1; i < jp->nprocs; i++) 268 out1fmt(" | %s", jp->ps[i].cmd ); 269 out1c('\n'); 270 flushall(); 271 272 for (i = 0; i < jp->nprocs; i++) 273 if (tcsetpgrp(ttyfd, jp->ps[i].pid) != -1) 274 break; 275 276 if (i >= jp->nprocs) { 277 error("Cannot set tty process group (%s) at %d", 278 strerror(errno), __LINE__); 279 } 280 restartjob(jp); 281 INTOFF; 282 status = waitforjob(jp); 283 INTON; 284 return status; 285 } 286 287 int 288 fgcmd(int argc, char **argv) 289 { 290 nextopt(""); 291 return do_fgcmd(*argptr); 292 } 293 294 int 295 fgcmd_percent(int argc, char **argv) 296 { 297 nextopt(""); 298 return do_fgcmd(*argv); 299 } 300 301 static void 302 set_curjob(struct job *jp, int mode) 303 { 304 struct job *jp1, *jp2; 305 int i, ji; 306 307 ji = jp - jobtab; 308 309 /* first remove from list */ 310 if (ji == curjob) 311 curjob = jp->prev_job; 312 else { 313 for (i = 0; i < njobs; i++) { 314 if (jobtab[i].prev_job != ji) 315 continue; 316 jobtab[i].prev_job = jp->prev_job; 317 break; 318 } 319 } 320 321 /* Then re-insert in correct position */ 322 switch (mode) { 323 case 0: /* job being deleted */ 324 jp->prev_job = -1; 325 break; 326 case 1: /* newly created job or backgrounded job, 327 put after all stopped jobs. */ 328 if (curjob != -1 && jobtab[curjob].state == JOBSTOPPED) { 329 for (jp1 = jobtab + curjob; ; jp1 = jp2) { 330 if (jp1->prev_job == -1) 331 break; 332 jp2 = jobtab + jp1->prev_job; 333 if (jp2->state != JOBSTOPPED) 334 break; 335 } 336 jp->prev_job = jp1->prev_job; 337 jp1->prev_job = ji; 338 break; 339 } 340 /* FALLTHROUGH */ 341 case 2: /* newly stopped job - becomes curjob */ 342 jp->prev_job = curjob; 343 curjob = ji; 344 break; 345 } 346 } 347 348 int 349 bgcmd(int argc, char **argv) 350 { 351 struct job *jp; 352 int i; 353 354 nextopt(""); 355 if (jobs_invalid) 356 error("No current jobs"); 357 do { 358 jp = getjob(*argptr, 0); 359 if (jp->jobctl == 0) 360 error("job not created under job control"); 361 set_curjob(jp, 1); 362 out1fmt("[%ld] %s", (long)(jp - jobtab + 1), jp->ps[0].cmd); 363 for (i = 1; i < jp->nprocs; i++) 364 out1fmt(" | %s", jp->ps[i].cmd ); 365 out1c('\n'); 366 flushall(); 367 restartjob(jp); 368 } while (*argptr && *++argptr); 369 return 0; 370 } 371 372 373 STATIC void 374 restartjob(struct job *jp) 375 { 376 struct procstat *ps; 377 int i; 378 379 if (jp->state == JOBDONE) 380 return; 381 INTOFF; 382 for (i = 0; i < jp->nprocs; i++) 383 if (killpg(jp->ps[i].pid, SIGCONT) != -1) 384 break; 385 if (i >= jp->nprocs) 386 error("Cannot continue job (%s)", strerror(errno)); 387 for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { 388 if (WIFSTOPPED(ps->status)) { 389 VTRACE(DBG_JOBS, ( 390 "restartjob: [%zu] pid %d status change" 391 " from %#x (stopped) to -1 (running)\n", 392 (size_t)(jp-jobtab+1), ps->pid, ps->status)); 393 ps->status = -1; 394 jp->state = JOBRUNNING; 395 } 396 } 397 INTON; 398 } 399 #endif 400 401 inline static void 402 cmdputi(int n) 403 { 404 char str[20]; 405 406 fmtstr(str, sizeof str, "%d", n); 407 cmdputs(str); 408 } 409 410 static void 411 showjob(struct output *out, struct job *jp, int mode) 412 { 413 int procno; 414 int st; 415 struct procstat *ps; 416 int col; 417 char s[64]; 418 419 #if JOBS 420 if (mode & SHOW_PGID) { 421 /* just output process (group) id of pipeline */ 422 outfmt(out, "%ld\n", (long)jp->ps->pid); 423 return; 424 } 425 #endif 426 427 procno = jp->nprocs; 428 if (!procno) 429 return; 430 431 if (mode & SHOW_PID) 432 mode |= SHOW_MULTILINE; 433 434 if ((procno > 1 && !(mode & SHOW_MULTILINE)) 435 || (mode & SHOW_SIGNALLED)) { 436 /* See if we have more than one status to report */ 437 ps = jp->ps; 438 st = ps->status; 439 do { 440 int st1 = ps->status; 441 if (st1 != st) 442 /* yes - need multi-line output */ 443 mode |= SHOW_MULTILINE; 444 if (st1 == -1 || !(mode & SHOW_SIGNALLED) || WIFEXITED(st1)) 445 continue; 446 if (WIFSTOPPED(st1) || ((st1 = WTERMSIG(st1) & 0x7f) 447 && st1 != SIGINT && st1 != SIGPIPE)) 448 mode |= SHOW_ISSIG; 449 450 } while (ps++, --procno); 451 procno = jp->nprocs; 452 } 453 454 if (mode & SHOW_SIGNALLED && !(mode & SHOW_ISSIG)) { 455 if (jp->state == JOBDONE && !(mode & SHOW_NO_FREE)) { 456 VTRACE(DBG_JOBS, ("showjob: freeing job %d\n", 457 jp - jobtab + 1)); 458 freejob(jp); 459 } 460 return; 461 } 462 463 for (ps = jp->ps; --procno >= 0; ps++) { /* for each process */ 464 if (ps == jp->ps) 465 fmtstr(s, 16, "[%ld] %c ", 466 (long)(jp - jobtab + 1), 467 #if JOBS 468 jp - jobtab == curjob ? 469 '+' : 470 curjob != -1 && 471 jp - jobtab == jobtab[curjob].prev_job ? 472 '-' : 473 #endif 474 ' '); 475 else 476 fmtstr(s, 16, " " ); 477 col = strlen(s); 478 if (mode & SHOW_PID) { 479 fmtstr(s + col, 16, "%ld ", (long)ps->pid); 480 col += strlen(s + col); 481 } 482 if (ps->status == -1) { 483 scopy("Running", s + col); 484 } else if (WIFEXITED(ps->status)) { 485 st = WEXITSTATUS(ps->status); 486 if (st) 487 fmtstr(s + col, 16, "Done(%d)", st); 488 else 489 fmtstr(s + col, 16, "Done"); 490 } else { 491 #if JOBS 492 if (WIFSTOPPED(ps->status)) 493 st = WSTOPSIG(ps->status); 494 else /* WIFSIGNALED(ps->status) */ 495 #endif 496 st = WTERMSIG(ps->status); 497 st &= 0x7f; 498 if (st < NSIG && sys_siglist[st]) 499 scopyn(sys_siglist[st], s + col, 32); 500 else 501 fmtstr(s + col, 16, "Signal %d", st); 502 if (WCOREDUMP(ps->status)) { 503 col += strlen(s + col); 504 scopyn(" (core dumped)", s + col, 64 - col); 505 } 506 } 507 col += strlen(s + col); 508 outstr(s, out); 509 do { 510 outc(' ', out); 511 col++; 512 } while (col < 30); 513 outstr(ps->cmd, out); 514 if (mode & SHOW_MULTILINE) { 515 if (procno > 0) { 516 outc(' ', out); 517 outc('|', out); 518 } 519 } else { 520 while (--procno >= 0) 521 outfmt(out, " | %s", (++ps)->cmd ); 522 } 523 outc('\n', out); 524 } 525 flushout(out); 526 jp->flags &= ~JOBCHANGED; 527 if (jp->state == JOBDONE && !(mode & SHOW_NO_FREE)) 528 freejob(jp); 529 } 530 531 int 532 jobscmd(int argc, char **argv) 533 { 534 int mode, m; 535 536 mode = 0; 537 while ((m = nextopt("lp"))) 538 if (m == 'l') 539 mode = SHOW_PID; 540 else 541 mode = SHOW_PGID; 542 if (!iflag) 543 mode |= SHOW_NO_FREE; 544 if (*argptr) 545 do 546 showjob(out1, getjob(*argptr,0), mode); 547 while (*++argptr); 548 else 549 showjobs(out1, mode); 550 return 0; 551 } 552 553 554 /* 555 * Print a list of jobs. If "change" is nonzero, only print jobs whose 556 * statuses have changed since the last call to showjobs. 557 * 558 * If the shell is interrupted in the process of creating a job, the 559 * result may be a job structure containing zero processes. Such structures 560 * will be freed here. 561 */ 562 563 void 564 showjobs(struct output *out, int mode) 565 { 566 int jobno; 567 struct job *jp; 568 int silent = 0, gotpid; 569 570 CTRACE(DBG_JOBS, ("showjobs(%x) called\n", mode)); 571 572 /* If not even one one job changed, there is nothing to do */ 573 gotpid = dowait(WSILENT, NULL, NULL); 574 while (dowait(WSILENT, NULL, NULL) > 0) 575 continue; 576 #ifdef JOBS 577 /* 578 * Check if we are not in our foreground group, and if not 579 * put us in it. 580 */ 581 if (mflag && gotpid != -1 && tcgetpgrp(ttyfd) != getpid()) { 582 if (tcsetpgrp(ttyfd, getpid()) == -1) 583 error("Cannot set tty process group (%s) at %d", 584 strerror(errno), __LINE__); 585 VTRACE(DBG_JOBS|DBG_INPUT, ("repaired tty process group\n")); 586 silent = 1; 587 } 588 #endif 589 if (jobs_invalid) 590 return; 591 592 for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) { 593 if (!jp->used) 594 continue; 595 if (jp->nprocs == 0) { 596 freejob(jp); 597 continue; 598 } 599 if ((mode & SHOW_CHANGED) && !(jp->flags & JOBCHANGED)) 600 continue; 601 if (silent && (jp->flags & JOBCHANGED)) { 602 jp->flags &= ~JOBCHANGED; 603 continue; 604 } 605 showjob(out, jp, mode); 606 } 607 } 608 609 /* 610 * Mark a job structure as unused. 611 */ 612 613 STATIC void 614 freejob(struct job *jp) 615 { 616 INTOFF; 617 if (jp->ps != &jp->ps0) { 618 ckfree(jp->ps); 619 jp->ps = &jp->ps0; 620 } 621 jp->nprocs = 0; 622 jp->used = 0; 623 #if JOBS 624 set_curjob(jp, 0); 625 #endif 626 INTON; 627 } 628 629 /* 630 * Extract the status of a completed job (for $?) 631 */ 632 STATIC int 633 jobstatus(const struct job *jp, int raw) 634 { 635 int status = 0; 636 int retval; 637 638 if ((jp->flags & JPIPEFAIL) && jp->nprocs) { 639 int i; 640 641 for (i = 0; i < jp->nprocs; i++) 642 if (jp->ps[i].status != 0) 643 status = jp->ps[i].status; 644 } else 645 status = jp->ps[jp->nprocs ? jp->nprocs - 1 : 0].status; 646 647 if (raw) 648 return status; 649 650 if (WIFEXITED(status)) 651 retval = WEXITSTATUS(status); 652 #if JOBS 653 else if (WIFSTOPPED(status)) 654 retval = WSTOPSIG(status) + 128; 655 #endif 656 else { 657 /* XXX: limits number of signals */ 658 retval = WTERMSIG(status) + 128; 659 } 660 661 return retval; 662 } 663 664 665 666 int 667 waitcmd(int argc, char **argv) 668 { 669 struct job *job, *last; 670 int retval; 671 struct job *jp; 672 int i; 673 int any = 0; 674 int found; 675 char *pid = NULL, *fpid; 676 char **arg; 677 char idstring[20]; 678 679 while ((i = nextopt("np:")) != '\0') { 680 switch (i) { 681 case 'n': 682 any = 1; 683 break; 684 case 'p': 685 if (pid) 686 error("more than one -p unsupported"); 687 pid = optionarg; 688 break; 689 } 690 } 691 692 if (pid != NULL) { 693 if (!validname(pid, '\0', NULL)) 694 error("invalid name: -p '%s'", pid); 695 if (unsetvar(pid, 0)) 696 error("%s readonly", pid); 697 } 698 699 /* 700 * If we have forked, and not yet created any new jobs, then 701 * we have no children, whatever jobtab claims, 702 * so simply return in that case. 703 * 704 * The return code is 127 if we had any pid args (none are found) 705 * or if we had -n (nothing exited), but 0 for plain old "wait". 706 */ 707 if (jobs_invalid) { 708 CTRACE(DBG_WAIT, ("builtin wait%s%s in child, invalid jobtab\n", 709 any ? " -n" : "", *argptr ? " pid..." : "")); 710 return (any || *argptr) ? 127 : 0; 711 } 712 713 /* clear stray flags left from previous waitcmd */ 714 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 715 jp->flags &= ~JOBWANTED; 716 jp->ref = NULL; 717 } 718 719 CTRACE(DBG_WAIT, 720 ("builtin wait%s%s\n", any ? " -n" : "", *argptr ? " pid..." : "")); 721 722 /* 723 * First, validate the jobnum args, count how many refer to 724 * (different) running jobs, and if we had -n, and found that one has 725 * already finished, we return that one. Otherwise remember 726 * which ones we are looking for (JOBWANTED). 727 */ 728 found = 0; 729 last = NULL; 730 for (arg = argptr; *arg; arg++) { 731 last = jp = getjob(*arg, 1); 732 if (!jp) 733 continue; 734 if (jp->ref == NULL) 735 jp->ref = *arg; 736 if (any && jp->state == JOBDONE) { 737 /* 738 * We just want any of them, and this one is 739 * ready for consumption, bon apetit ... 740 */ 741 retval = jobstatus(jp, 0); 742 if (pid) 743 setvar(pid, *arg, 0); 744 if (!iflag) 745 freejob(jp); 746 CTRACE(DBG_WAIT, ("wait -n found %s already done: %d\n", *arg, retval)); 747 return retval; 748 } 749 if (!(jp->flags & JOBWANTED)) { 750 /* 751 * It is possible to list the same job several 752 * times - the obvious "wait 1 1 1" or 753 * "wait %% %2 102" where job 2 is current and pid 102 754 * However many times it is requested, it is found once. 755 */ 756 found++; 757 jp->flags |= JOBWANTED; 758 } 759 job = jp; 760 } 761 762 VTRACE(DBG_WAIT, ("wait %s%s%sfound %d candidates (last %s)\n", 763 any ? "-n " : "", *argptr ? *argptr : "", 764 argptr[0] && argptr[1] ? "... " : " ", found, 765 job ? (job->ref ? job->ref : "<no-arg>") : "none")); 766 767 /* 768 * If we were given a list of jobnums: 769 * and none of those exist, then we're done. 770 */ 771 if (*argptr && found == 0) 772 return 127; 773 774 /* 775 * Otherwise we need to wait for something to complete 776 * When it does, we check and see if it is one of the 777 * jobs we're waiting on, and if so, we clean it up. 778 * If we had -n, then we're done, otherwise we do it all again 779 * until all we had listed are done, of if there were no 780 * jobnum args, all are done. 781 */ 782 783 retval = any || *argptr ? 127 : 0; 784 fpid = NULL; 785 for (;;) { 786 VTRACE(DBG_WAIT, ("wait waiting (%d remain): ", found)); 787 for (jp = jobtab, i = njobs; --i >= 0; jp++) { 788 if (jp->used && jp->flags & JOBWANTED && 789 jp->state == JOBDONE) 790 break; 791 if (jp->used && jp->state == JOBRUNNING) 792 break; 793 } 794 if (i < 0) { 795 CTRACE(DBG_WAIT, ("nothing running (ret: %d) fpid %s\n", 796 retval, fpid ? fpid : "unset")); 797 if (pid && fpid) 798 setvar(pid, fpid, 0); 799 return retval; 800 } 801 VTRACE(DBG_WAIT, ("found @%d/%d state: %d\n", njobs-i, njobs, 802 jp->state)); 803 804 /* 805 * There is at least 1 job running, so we can 806 * safely wait() for something to exit. 807 */ 808 if (jp->state == JOBRUNNING) { 809 job = NULL; 810 if ((i = dowait(WBLOCK|WNOFREE, NULL, &job)) == -1) 811 return 128 + lastsig(); 812 813 /* 814 * one of the job's processes exited, 815 * but there are more 816 */ 817 if (job->state == JOBRUNNING) 818 continue; 819 } else 820 job = jp; /* we want this, and it is done */ 821 822 if (job->flags & JOBWANTED || (*argptr == 0 && any)) { 823 int rv; 824 825 job->flags &= ~JOBWANTED; /* got it */ 826 rv = jobstatus(job, 0); 827 VTRACE(DBG_WAIT, ( 828 "wanted %d (%s) done: st=%d", i, 829 job->ref ? job->ref : "", rv)); 830 if (any || job == last) { 831 retval = rv; 832 fpid = job->ref; 833 834 VTRACE(DBG_WAIT, (" save")); 835 if (pid) { 836 /* 837 * don't need fpid unless we are going 838 * to return it. 839 */ 840 if (fpid == NULL) { 841 /* 842 * this only happens with "wait -n" 843 * (that is, no pid args) 844 */ 845 snprintf(idstring, sizeof idstring, 846 "%d", job->ps[ job->nprocs ? 847 job->nprocs-1 : 848 0 ].pid); 849 fpid = idstring; 850 } 851 VTRACE(DBG_WAIT, (" (for %s)", fpid)); 852 } 853 } 854 855 if (job->state == JOBDONE) { 856 VTRACE(DBG_WAIT, (" free")); 857 freejob(job); 858 } 859 860 if (any || (found > 0 && --found == 0)) { 861 if (pid && fpid) 862 setvar(pid, fpid, 0); 863 VTRACE(DBG_WAIT, (" return %d\n", retval)); 864 return retval; 865 } 866 VTRACE(DBG_WAIT, ("\n")); 867 continue; 868 } 869 870 /* this is to handle "wait" (no args) */ 871 if (found == 0 && job->state == JOBDONE) { 872 VTRACE(DBG_JOBS|DBG_WAIT, ("Cleanup: %d\n", i)); 873 freejob(job); 874 } 875 } 876 } 877 878 879 int 880 jobidcmd(int argc, char **argv) 881 { 882 struct job *jp; 883 int i; 884 int pg = 0, onep = 0, job = 0; 885 886 while ((i = nextopt("gjp"))) { 887 switch (i) { 888 case 'g': pg = 1; break; 889 case 'j': job = 1; break; 890 case 'p': onep = 1; break; 891 } 892 } 893 CTRACE(DBG_JOBS, ("jobidcmd%s%s%s%s %s\n", pg ? " -g" : "", 894 onep ? " -p" : "", job ? " -j" : "", jobs_invalid ? " [inv]" : "", 895 *argptr ? *argptr : "<implicit %%>")); 896 if (pg + onep + job > 1) 897 error("-g -j and -p options cannot be combined"); 898 899 if (argptr[0] && argptr[1]) 900 error("usage: jobid [-g|-p|-r] jobid"); 901 902 jp = getjob(*argptr, 0); 903 if (job) { 904 out1fmt("%%%zu\n", (size_t)(jp - jobtab + 1)); 905 return 0; 906 } 907 if (pg) { 908 if (jp->pgrp != 0) { 909 out1fmt("%ld\n", (long)jp->pgrp); 910 return 0; 911 } 912 return 1; 913 } 914 if (onep) { 915 i = jp->nprocs - 1; 916 if (i < 0) 917 return 1; 918 out1fmt("%ld\n", (long)jp->ps[i].pid); 919 return 0; 920 } 921 for (i = 0 ; i < jp->nprocs ; ) { 922 out1fmt("%ld", (long)jp->ps[i].pid); 923 out1c(++i < jp->nprocs ? ' ' : '\n'); 924 } 925 return 0; 926 } 927 928 int 929 getjobpgrp(const char *name) 930 { 931 struct job *jp; 932 933 if (jobs_invalid) 934 error("No such job: %s", name); 935 jp = getjob(name, 1); 936 if (jp == 0) 937 return 0; 938 return -jp->ps[0].pid; 939 } 940 941 /* 942 * Convert a job name to a job structure. 943 */ 944 945 STATIC struct job * 946 getjob(const char *name, int noerror) 947 { 948 int jobno = -1; 949 struct job *jp; 950 int pid; 951 int i; 952 const char *err_msg = "No such job: %s"; 953 954 if (name == NULL) { 955 #if JOBS 956 jobno = curjob; 957 #endif 958 err_msg = "No current job"; 959 } else if (name[0] == '%') { 960 if (is_number(name + 1)) { 961 jobno = number(name + 1) - 1; 962 } else if (!name[1] || !name[2]) { 963 switch (name[1]) { 964 #if JOBS 965 case 0: 966 case '+': 967 case '%': 968 jobno = curjob; 969 err_msg = "No current job"; 970 break; 971 case '-': 972 jobno = curjob; 973 if (jobno != -1) 974 jobno = jobtab[jobno].prev_job; 975 err_msg = "No previous job"; 976 break; 977 #endif 978 default: 979 goto check_pattern; 980 } 981 } else { 982 struct job *found; 983 check_pattern: 984 found = NULL; 985 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 986 if (!jp->used || jp->nprocs <= 0) 987 continue; 988 if ((name[1] == '?' 989 && strstr(jp->ps[0].cmd, name + 2)) 990 || prefix(name + 1, jp->ps[0].cmd)) { 991 if (found) { 992 err_msg = "%s: ambiguous"; 993 found = 0; 994 break; 995 } 996 found = jp; 997 } 998 } 999 if (found) 1000 return found; 1001 } 1002 1003 } else if (is_number(name)) { 1004 pid = number(name); 1005 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 1006 if (jp->used && jp->nprocs > 0 1007 && jp->ps[jp->nprocs - 1].pid == pid) 1008 return jp; 1009 } 1010 } 1011 1012 if (jobno >= 0 && jobno < njobs) { 1013 jp = jobtab + jobno; 1014 if (jp->used) 1015 return jp; 1016 } 1017 if (!noerror) 1018 error(err_msg, name); 1019 return 0; 1020 } 1021 1022 1023 1024 /* 1025 * Return a new job structure, 1026 */ 1027 1028 struct job * 1029 makejob(union node *node, int nprocs) 1030 { 1031 int i; 1032 struct job *jp; 1033 1034 if (jobs_invalid) { 1035 for (i = njobs, jp = jobtab ; --i >= 0 ; jp++) { 1036 if (jp->used) 1037 freejob(jp); 1038 } 1039 jobs_invalid = 0; 1040 } 1041 1042 for (i = njobs, jp = jobtab ; ; jp++) { 1043 if (--i < 0) { 1044 INTOFF; 1045 if (njobs == 0) { 1046 jobtab = ckmalloc(4 * sizeof jobtab[0]); 1047 } else { 1048 jp = ckmalloc((njobs + 4) * sizeof jobtab[0]); 1049 memcpy(jp, jobtab, njobs * sizeof jp[0]); 1050 /* Relocate `ps' pointers */ 1051 for (i = 0; i < njobs; i++) 1052 if (jp[i].ps == &jobtab[i].ps0) 1053 jp[i].ps = &jp[i].ps0; 1054 ckfree(jobtab); 1055 jobtab = jp; 1056 } 1057 jp = jobtab + njobs; 1058 for (i = 4 ; --i >= 0 ; njobs++) { 1059 jobtab[njobs].used = 0; 1060 jobtab[njobs].prev_job = -1; 1061 } 1062 INTON; 1063 break; 1064 } 1065 if (jp->used == 0) 1066 break; 1067 } 1068 INTOFF; 1069 jp->state = JOBRUNNING; 1070 jp->used = 1; 1071 jp->flags = pipefail ? JPIPEFAIL : 0; 1072 jp->nprocs = 0; 1073 jp->pgrp = 0; 1074 #if JOBS 1075 jp->jobctl = jobctl; 1076 set_curjob(jp, 1); 1077 #endif 1078 if (nprocs > 1) { 1079 jp->ps = ckmalloc(nprocs * sizeof (struct procstat)); 1080 } else { 1081 jp->ps = &jp->ps0; 1082 } 1083 INTON; 1084 VTRACE(DBG_JOBS, ("makejob(%p, %d)%s returns %%%d\n", (void *)node, 1085 nprocs, (jp->flags&JPIPEFAIL)?" PF":"", jp - jobtab + 1)); 1086 return jp; 1087 } 1088 1089 1090 /* 1091 * Fork off a subshell. If we are doing job control, give the subshell its 1092 * own process group. Jp is a job structure that the job is to be added to. 1093 * N is the command that will be evaluated by the child. Both jp and n may 1094 * be NULL. The mode parameter can be one of the following: 1095 * FORK_FG - Fork off a foreground process. 1096 * FORK_BG - Fork off a background process. 1097 * FORK_NOJOB - Like FORK_FG, but don't give the process its own 1098 * process group even if job control is on. 1099 * 1100 * When job control is turned off, background processes have their standard 1101 * input redirected to /dev/null (except for the second and later processes 1102 * in a pipeline). 1103 */ 1104 1105 int 1106 forkshell(struct job *jp, union node *n, int mode) 1107 { 1108 pid_t pid; 1109 int serrno; 1110 1111 CTRACE(DBG_JOBS, ("forkshell(%%%d, %p, %d) called\n", 1112 jp - jobtab, n, mode)); 1113 1114 switch ((pid = fork())) { 1115 case -1: 1116 serrno = errno; 1117 VTRACE(DBG_JOBS, ("Fork failed, errno=%d\n", serrno)); 1118 INTON; 1119 error("Cannot fork (%s)", strerror(serrno)); 1120 break; 1121 case 0: 1122 SHELL_FORKED(); 1123 forkchild(jp, n, mode, 0); 1124 return 0; 1125 default: 1126 return forkparent(jp, n, mode, pid); 1127 } 1128 } 1129 1130 int 1131 forkparent(struct job *jp, union node *n, int mode, pid_t pid) 1132 { 1133 int pgrp; 1134 1135 if (rootshell && mode != FORK_NOJOB && mflag) { 1136 if (jp == NULL || jp->nprocs == 0) 1137 pgrp = pid; 1138 else 1139 pgrp = jp->ps[0].pid; 1140 jp->pgrp = pgrp; 1141 /* This can fail because we are doing it in the child also */ 1142 (void)setpgid(pid, pgrp); 1143 } 1144 if (mode == FORK_BG) 1145 backgndpid = pid; /* set $! */ 1146 if (jp) { 1147 struct procstat *ps = &jp->ps[jp->nprocs++]; 1148 ps->pid = pid; 1149 ps->status = -1; 1150 ps->cmd[0] = 0; 1151 if (/* iflag && rootshell && */ n) 1152 commandtext(ps, n); 1153 } 1154 CTRACE(DBG_JOBS, ("In parent shell: child = %d (mode %d)\n",pid,mode)); 1155 return pid; 1156 } 1157 1158 void 1159 forkchild(struct job *jp, union node *n, int mode, int vforked) 1160 { 1161 int wasroot; 1162 int pgrp; 1163 const char *devnull = _PATH_DEVNULL; 1164 const char *nullerr = "Can't open %s"; 1165 1166 wasroot = rootshell; 1167 CTRACE(DBG_JOBS, ("Child shell %d %sforked from %d (mode %d)\n", 1168 getpid(), vforked?"v":"", getppid(), mode)); 1169 if (!vforked) 1170 rootshell = 0; 1171 1172 closescript(vforked); 1173 clear_traps(vforked); 1174 #if JOBS 1175 if (!vforked) 1176 jobctl = 0; /* do job control only in root shell */ 1177 if (wasroot && mode != FORK_NOJOB && mflag) { 1178 if (jp == NULL || jp->nprocs == 0) 1179 pgrp = getpid(); 1180 else 1181 pgrp = jp->ps[0].pid; 1182 /* This can fail because we are doing it in the parent also */ 1183 (void)setpgid(0, pgrp); 1184 if (mode == FORK_FG) { 1185 if (tcsetpgrp(ttyfd, pgrp) == -1) 1186 error("Cannot set tty process group (%s) at %d", 1187 strerror(errno), __LINE__); 1188 } 1189 setsignal(SIGTSTP, vforked); 1190 setsignal(SIGTTOU, vforked); 1191 } else if (mode == FORK_BG) { 1192 ignoresig(SIGINT, vforked); 1193 ignoresig(SIGQUIT, vforked); 1194 if ((jp == NULL || jp->nprocs == 0) && 1195 ! fd0_redirected_p ()) { 1196 close(0); 1197 if (open(devnull, O_RDONLY) != 0) 1198 error(nullerr, devnull); 1199 } 1200 } 1201 #else 1202 if (mode == FORK_BG) { 1203 ignoresig(SIGINT, vforked); 1204 ignoresig(SIGQUIT, vforked); 1205 if ((jp == NULL || jp->nprocs == 0) && 1206 ! fd0_redirected_p ()) { 1207 close(0); 1208 if (open(devnull, O_RDONLY) != 0) 1209 error(nullerr, devnull); 1210 } 1211 } 1212 #endif 1213 if (wasroot && iflag) { 1214 setsignal(SIGINT, vforked); 1215 setsignal(SIGQUIT, vforked); 1216 setsignal(SIGTERM, vforked); 1217 } 1218 1219 if (!vforked) 1220 jobs_invalid = 1; 1221 } 1222 1223 /* 1224 * Wait for job to finish. 1225 * 1226 * Under job control we have the problem that while a child process is 1227 * running interrupts generated by the user are sent to the child but not 1228 * to the shell. This means that an infinite loop started by an inter- 1229 * active user may be hard to kill. With job control turned off, an 1230 * interactive user may place an interactive program inside a loop. If 1231 * the interactive program catches interrupts, the user doesn't want 1232 * these interrupts to also abort the loop. The approach we take here 1233 * is to have the shell ignore interrupt signals while waiting for a 1234 * forground process to terminate, and then send itself an interrupt 1235 * signal if the child process was terminated by an interrupt signal. 1236 * Unfortunately, some programs want to do a bit of cleanup and then 1237 * exit on interrupt; unless these processes terminate themselves by 1238 * sending a signal to themselves (instead of calling exit) they will 1239 * confuse this approach. 1240 */ 1241 1242 int 1243 waitforjob(struct job *jp) 1244 { 1245 #if JOBS 1246 int mypgrp = getpgrp(); 1247 #endif 1248 int status; 1249 int st; 1250 1251 INTOFF; 1252 VTRACE(DBG_JOBS, ("waitforjob(%%%d) called\n", jp - jobtab + 1)); 1253 while (jp->state == JOBRUNNING) { 1254 dowait(WBLOCK, jp, NULL); 1255 } 1256 #if JOBS 1257 if (jp->jobctl) { 1258 if (tcsetpgrp(ttyfd, mypgrp) == -1) 1259 error("Cannot set tty process group (%s) at %d", 1260 strerror(errno), __LINE__); 1261 } 1262 if (jp->state == JOBSTOPPED && curjob != jp - jobtab) 1263 set_curjob(jp, 2); 1264 #endif 1265 status = jobstatus(jp, 1); 1266 1267 /* convert to 8 bits */ 1268 if (WIFEXITED(status)) 1269 st = WEXITSTATUS(status); 1270 #if JOBS 1271 else if (WIFSTOPPED(status)) 1272 st = WSTOPSIG(status) + 128; 1273 #endif 1274 else 1275 st = WTERMSIG(status) + 128; 1276 1277 VTRACE(DBG_JOBS, ("waitforjob: job %d, nproc %d, status %d, st %x\n", 1278 jp - jobtab + 1, jp->nprocs, status, st)); 1279 #if JOBS 1280 if (jp->jobctl) { 1281 /* 1282 * This is truly gross. 1283 * If we're doing job control, then we did a TIOCSPGRP which 1284 * caused us (the shell) to no longer be in the controlling 1285 * session -- so we wouldn't have seen any ^C/SIGINT. So, we 1286 * intuit from the subprocess exit status whether a SIGINT 1287 * occurred, and if so interrupt ourselves. Yuck. - mycroft 1288 */ 1289 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGINT) 1290 raise(SIGINT); 1291 } 1292 #endif 1293 if (! JOBS || jp->state == JOBDONE) 1294 freejob(jp); 1295 INTON; 1296 return st; 1297 } 1298 1299 1300 1301 /* 1302 * Wait for a process to terminate. 1303 */ 1304 1305 STATIC int 1306 dowait(int flags, struct job *job, struct job **changed) 1307 { 1308 int pid; 1309 int status; 1310 struct procstat *sp; 1311 struct job *jp; 1312 struct job *thisjob; 1313 int done; 1314 int stopped; 1315 1316 VTRACE(DBG_JOBS|DBG_PROCS, ("dowait(%x) called\n", flags)); 1317 1318 if (changed != NULL) 1319 *changed = NULL; 1320 1321 do { 1322 pid = waitproc(flags & WBLOCK, job, &status); 1323 VTRACE(DBG_JOBS|DBG_PROCS, ("wait returns pid %d, status %#x\n", 1324 pid, status)); 1325 } while (pid == -1 && errno == EINTR && pendingsigs == 0); 1326 if (pid <= 0) 1327 return pid; 1328 INTOFF; 1329 thisjob = NULL; 1330 for (jp = jobtab ; jp < jobtab + njobs ; jp++) { 1331 if (jp->used) { 1332 done = 1; 1333 stopped = 1; 1334 for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) { 1335 if (sp->pid == -1) 1336 continue; 1337 if (sp->pid == pid && 1338 (sp->status==-1 || WIFSTOPPED(sp->status))) { 1339 VTRACE(DBG_JOBS | DBG_PROCS, 1340 ("Job %d: changing status of proc %d from %#x to %#x\n", 1341 jp - jobtab + 1, pid, 1342 sp->status, status)); 1343 if (WIFCONTINUED(status)) { 1344 if (sp->status != -1) 1345 jp->flags |= JOBCHANGED; 1346 sp->status = -1; 1347 jp->state = 0; 1348 } else 1349 sp->status = status; 1350 thisjob = jp; 1351 if (changed != NULL) 1352 *changed = jp; 1353 } 1354 if (sp->status == -1) 1355 stopped = 0; 1356 else if (WIFSTOPPED(sp->status)) 1357 done = 0; 1358 } 1359 if (stopped) { /* stopped or done */ 1360 int state = done ? JOBDONE : JOBSTOPPED; 1361 1362 if (jp->state != state) { 1363 VTRACE(DBG_JOBS, 1364 ("Job %d: changing state from %d to %d\n", 1365 jp - jobtab + 1, jp->state, state)); 1366 jp->state = state; 1367 #if JOBS 1368 if (done) 1369 set_curjob(jp, 0); 1370 #endif 1371 } 1372 } 1373 } 1374 } 1375 1376 if (thisjob && 1377 (thisjob->state != JOBRUNNING || thisjob->flags & JOBCHANGED)) { 1378 int mode = 0; 1379 1380 if (!rootshell || !iflag) 1381 mode = SHOW_SIGNALLED; 1382 if ((job == thisjob && (flags & WNOFREE) == 0) || 1383 job != thisjob) 1384 mode = SHOW_SIGNALLED | SHOW_NO_FREE; 1385 if (mode && (flags & WSILENT) == 0) 1386 showjob(out2, thisjob, mode); 1387 else { 1388 VTRACE(DBG_JOBS, 1389 ("Not printing status, rootshell=%d, job=%p\n", 1390 rootshell, job)); 1391 thisjob->flags |= JOBCHANGED; 1392 } 1393 } 1394 1395 INTON; 1396 return pid; 1397 } 1398 1399 1400 1401 /* 1402 * Do a wait system call. If job control is compiled in, we accept 1403 * stopped processes. If block is zero, we return a value of zero 1404 * rather than blocking. 1405 * 1406 * System V doesn't have a non-blocking wait system call. It does 1407 * have a SIGCLD signal that is sent to a process when one of its 1408 * children dies. The obvious way to use SIGCLD would be to install 1409 * a handler for SIGCLD which simply bumped a counter when a SIGCLD 1410 * was received, and have waitproc bump another counter when it got 1411 * the status of a process. Waitproc would then know that a wait 1412 * system call would not block if the two counters were different. 1413 * This approach doesn't work because if a process has children that 1414 * have not been waited for, System V will send it a SIGCLD when it 1415 * installs a signal handler for SIGCLD. What this means is that when 1416 * a child exits, the shell will be sent SIGCLD signals continuously 1417 * until is runs out of stack space, unless it does a wait call before 1418 * restoring the signal handler. The code below takes advantage of 1419 * this (mis)feature by installing a signal handler for SIGCLD and 1420 * then checking to see whether it was called. If there are any 1421 * children to be waited for, it will be. 1422 * 1423 * If neither SYSV nor BSD is defined, we don't implement nonblocking 1424 * waits at all. In this case, the user will not be informed when 1425 * a background process until the next time she runs a real program 1426 * (as opposed to running a builtin command or just typing return), 1427 * and the jobs command may give out of date information. 1428 */ 1429 1430 #ifdef SYSV 1431 STATIC int gotsigchild; 1432 1433 STATIC int onsigchild() { 1434 gotsigchild = 1; 1435 } 1436 #endif 1437 1438 1439 STATIC int 1440 waitproc(int block, struct job *jp, int *status) 1441 { 1442 #ifdef BSD 1443 int flags = 0; 1444 1445 #if JOBS 1446 if (mflag || (jp != NULL && jp->jobctl)) 1447 flags |= WUNTRACED | WCONTINUED; 1448 #endif 1449 if (block == 0) 1450 flags |= WNOHANG; 1451 VTRACE(DBG_WAIT, ("waitproc: doing waitpid(flags=%#x)\n", flags)); 1452 return waitpid(-1, status, flags); 1453 #else 1454 #ifdef SYSV 1455 int (*save)(); 1456 1457 if (block == 0) { 1458 gotsigchild = 0; 1459 save = signal(SIGCLD, onsigchild); 1460 signal(SIGCLD, save); 1461 if (gotsigchild == 0) 1462 return 0; 1463 } 1464 return wait(status); 1465 #else 1466 if (block == 0) 1467 return 0; 1468 return wait(status); 1469 #endif 1470 #endif 1471 } 1472 1473 /* 1474 * return 1 if there are stopped jobs, otherwise 0 1475 */ 1476 int job_warning = 0; 1477 int 1478 stoppedjobs(void) 1479 { 1480 int jobno; 1481 struct job *jp; 1482 1483 if (job_warning || jobs_invalid) 1484 return (0); 1485 for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) { 1486 if (jp->used == 0) 1487 continue; 1488 if (jp->state == JOBSTOPPED) { 1489 out2str("You have stopped jobs.\n"); 1490 job_warning = 2; 1491 return (1); 1492 } 1493 } 1494 1495 return (0); 1496 } 1497 1498 /* 1499 * Return a string identifying a command (to be printed by the 1500 * jobs command). 1501 */ 1502 1503 STATIC char *cmdnextc; 1504 STATIC int cmdnleft; 1505 1506 void 1507 commandtext(struct procstat *ps, union node *n) 1508 { 1509 int len; 1510 1511 cmdnextc = ps->cmd; 1512 if (iflag || mflag || sizeof(ps->cmd) <= 60) 1513 len = sizeof(ps->cmd); 1514 else if (sizeof ps->cmd <= 400) 1515 len = 50; 1516 else if (sizeof ps->cmd <= 800) 1517 len = 80; 1518 else 1519 len = sizeof(ps->cmd) / 10; 1520 cmdnleft = len; 1521 cmdtxt(n); 1522 if (cmdnleft <= 0) { 1523 char *p = ps->cmd + len - 4; 1524 p[0] = '.'; 1525 p[1] = '.'; 1526 p[2] = '.'; 1527 p[3] = 0; 1528 } else 1529 *cmdnextc = '\0'; 1530 1531 VTRACE(DBG_JOBS, 1532 ("commandtext: ps->cmd %p, end %p, left %d\n\t\"%s\"\n", 1533 ps->cmd, cmdnextc, cmdnleft, ps->cmd)); 1534 } 1535 1536 1537 STATIC void 1538 cmdtxt(union node *n) 1539 { 1540 union node *np; 1541 struct nodelist *lp; 1542 const char *p; 1543 int i; 1544 1545 if (n == NULL || cmdnleft <= 0) 1546 return; 1547 switch (n->type) { 1548 case NSEMI: 1549 cmdtxt(n->nbinary.ch1); 1550 cmdputs("; "); 1551 cmdtxt(n->nbinary.ch2); 1552 break; 1553 case NAND: 1554 cmdtxt(n->nbinary.ch1); 1555 cmdputs(" && "); 1556 cmdtxt(n->nbinary.ch2); 1557 break; 1558 case NOR: 1559 cmdtxt(n->nbinary.ch1); 1560 cmdputs(" || "); 1561 cmdtxt(n->nbinary.ch2); 1562 break; 1563 case NDNOT: 1564 cmdputs("! "); 1565 /* FALLTHROUGH */ 1566 case NNOT: 1567 cmdputs("! "); 1568 cmdtxt(n->nnot.com); 1569 break; 1570 case NPIPE: 1571 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 1572 cmdtxt(lp->n); 1573 if (lp->next) 1574 cmdputs(" | "); 1575 } 1576 if (n->npipe.backgnd) 1577 cmdputs(" &"); 1578 break; 1579 case NSUBSHELL: 1580 cmdputs("("); 1581 cmdtxt(n->nredir.n); 1582 cmdputs(")"); 1583 break; 1584 case NREDIR: 1585 case NBACKGND: 1586 cmdtxt(n->nredir.n); 1587 break; 1588 case NIF: 1589 cmdputs("if "); 1590 cmdtxt(n->nif.test); 1591 cmdputs("; then "); 1592 cmdtxt(n->nif.ifpart); 1593 if (n->nif.elsepart) { 1594 cmdputs("; else "); 1595 cmdtxt(n->nif.elsepart); 1596 } 1597 cmdputs("; fi"); 1598 break; 1599 case NWHILE: 1600 cmdputs("while "); 1601 goto until; 1602 case NUNTIL: 1603 cmdputs("until "); 1604 until: 1605 cmdtxt(n->nbinary.ch1); 1606 cmdputs("; do "); 1607 cmdtxt(n->nbinary.ch2); 1608 cmdputs("; done"); 1609 break; 1610 case NFOR: 1611 cmdputs("for "); 1612 cmdputs(n->nfor.var); 1613 cmdputs(" in "); 1614 cmdlist(n->nfor.args, 1); 1615 cmdputs("; do "); 1616 cmdtxt(n->nfor.body); 1617 cmdputs("; done"); 1618 break; 1619 case NCASE: 1620 cmdputs("case "); 1621 cmdputs(n->ncase.expr->narg.text); 1622 cmdputs(" in "); 1623 for (np = n->ncase.cases; np; np = np->nclist.next) { 1624 cmdtxt(np->nclist.pattern); 1625 cmdputs(") "); 1626 cmdtxt(np->nclist.body); 1627 switch (n->type) { /* switch (not if) for later */ 1628 case NCLISTCONT: 1629 cmdputs(";& "); 1630 break; 1631 default: 1632 cmdputs(";; "); 1633 break; 1634 } 1635 } 1636 cmdputs("esac"); 1637 break; 1638 case NDEFUN: 1639 cmdputs(n->narg.text); 1640 cmdputs("() { ... }"); 1641 break; 1642 case NCMD: 1643 cmdlist(n->ncmd.args, 1); 1644 cmdlist(n->ncmd.redirect, 0); 1645 if (n->ncmd.backgnd) 1646 cmdputs(" &"); 1647 break; 1648 case NARG: 1649 cmdputs(n->narg.text); 1650 break; 1651 case NTO: 1652 p = ">"; i = 1; goto redir; 1653 case NCLOBBER: 1654 p = ">|"; i = 1; goto redir; 1655 case NAPPEND: 1656 p = ">>"; i = 1; goto redir; 1657 case NTOFD: 1658 p = ">&"; i = 1; goto redir; 1659 case NFROM: 1660 p = "<"; i = 0; goto redir; 1661 case NFROMFD: 1662 p = "<&"; i = 0; goto redir; 1663 case NFROMTO: 1664 p = "<>"; i = 0; goto redir; 1665 redir: 1666 if (n->nfile.fd != i) 1667 cmdputi(n->nfile.fd); 1668 cmdputs(p); 1669 if (n->type == NTOFD || n->type == NFROMFD) { 1670 if (n->ndup.dupfd < 0) 1671 cmdputs("-"); 1672 else 1673 cmdputi(n->ndup.dupfd); 1674 } else { 1675 cmdtxt(n->nfile.fname); 1676 } 1677 break; 1678 case NHERE: 1679 case NXHERE: 1680 cmdputs("<<..."); 1681 break; 1682 default: 1683 cmdputs("???"); 1684 break; 1685 } 1686 } 1687 1688 STATIC void 1689 cmdlist(union node *np, int sep) 1690 { 1691 for (; np; np = np->narg.next) { 1692 if (!sep) 1693 cmdputs(" "); 1694 cmdtxt(np); 1695 if (sep && np->narg.next) 1696 cmdputs(" "); 1697 } 1698 } 1699 1700 1701 STATIC void 1702 cmdputs(const char *s) 1703 { 1704 const char *p, *str = 0; 1705 char c, cc[2] = " "; 1706 char *nextc; 1707 int nleft; 1708 int subtype = 0; 1709 int quoted = 0; 1710 static char vstype[16][4] = { "", "}", "-", "+", "?", "=", 1711 "#", "##", "%", "%%", "}" }; 1712 1713 p = s; 1714 nextc = cmdnextc; 1715 nleft = cmdnleft; 1716 while (nleft > 0 && (c = *p++) != 0) { 1717 switch (c) { 1718 case CTLNONL: 1719 c = '\0'; 1720 break; 1721 case CTLESC: 1722 c = *p++; 1723 break; 1724 case CTLVAR: 1725 subtype = *p++; 1726 if (subtype & VSLINENO) { /* undo LINENO hack */ 1727 if ((subtype & VSTYPE) == VSLENGTH) 1728 str = "${#LINENO"; /*}*/ 1729 else 1730 str = "${LINENO"; /*}*/ 1731 while (is_digit(*p)) 1732 p++; 1733 } else if ((subtype & VSTYPE) == VSLENGTH) 1734 str = "${#"; /*}*/ 1735 else 1736 str = "${"; /*}*/ 1737 if (!(subtype & VSQUOTE) != !(quoted & 1)) { 1738 quoted ^= 1; 1739 c = '"'; 1740 } else { 1741 c = *str++; 1742 } 1743 break; 1744 case CTLENDVAR: /*{*/ 1745 c = '}'; 1746 if (quoted & 1) 1747 str = "\""; 1748 quoted >>= 1; 1749 subtype = 0; 1750 break; 1751 case CTLBACKQ: 1752 c = '$'; 1753 str = "(...)"; 1754 break; 1755 case CTLBACKQ+CTLQUOTE: 1756 c = '"'; 1757 str = "$(...)\""; 1758 break; 1759 case CTLARI: 1760 c = '$'; 1761 if (*p == ' ') 1762 p++; 1763 str = "(("; /*))*/ 1764 break; 1765 case CTLENDARI: /*((*/ 1766 c = ')'; 1767 str = ")"; 1768 break; 1769 case CTLQUOTEMARK: 1770 quoted ^= 1; 1771 c = '"'; 1772 break; 1773 case CTLQUOTEEND: 1774 quoted >>= 1; 1775 c = '"'; 1776 break; 1777 case '=': 1778 if (subtype == 0) 1779 break; 1780 str = vstype[subtype & VSTYPE]; 1781 if (subtype & VSNUL) 1782 c = ':'; 1783 else 1784 c = *str++; /*{*/ 1785 if (c != '}') 1786 quoted <<= 1; 1787 else if (*p == CTLENDVAR) 1788 c = *str++; 1789 subtype = 0; 1790 break; 1791 case '\'': 1792 case '\\': 1793 case '"': 1794 case '$': 1795 /* These can only happen inside quotes */ 1796 cc[0] = c; 1797 str = cc; 1798 c = '\\'; 1799 break; 1800 default: 1801 break; 1802 } 1803 if (c != '\0') do { /* c == 0 implies nothing in str */ 1804 *nextc++ = c; 1805 } while (--nleft > 0 && str && (c = *str++)); 1806 str = 0; 1807 } 1808 if ((quoted & 1) && nleft) { 1809 *nextc++ = '"'; 1810 nleft--; 1811 } 1812 cmdnleft = nleft; 1813 cmdnextc = nextc; 1814 } 1815
Indexes created Wed Oct 01 19:09:53 GMT 2025