jobs.c revision 1.104
1 /* $NetBSD: jobs.c,v 1.104 2019/02/09 03:35:55 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 1.104 2019/02/09 03:35:55 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 INTOFF; 281 restartjob(jp); 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 scopyn(strsignal(st), s + col, 32); 498 if (WCOREDUMP(ps->status)) { 499 col += strlen(s + col); 500 scopyn(" (core dumped)", s + col, 64 - col); 501 } 502 } 503 col += strlen(s + col); 504 outstr(s, out); 505 do { 506 outc(' ', out); 507 col++; 508 } while (col < 30); 509 outstr(ps->cmd, out); 510 if (mode & SHOW_MULTILINE) { 511 if (procno > 0) { 512 outc(' ', out); 513 outc('|', out); 514 } 515 } else { 516 while (--procno >= 0) 517 outfmt(out, " | %s", (++ps)->cmd ); 518 } 519 outc('\n', out); 520 } 521 flushout(out); 522 jp->flags &= ~JOBCHANGED; 523 if (jp->state == JOBDONE && !(mode & SHOW_NO_FREE)) 524 freejob(jp); 525 } 526 527 int 528 jobscmd(int argc, char **argv) 529 { 530 int mode, m; 531 532 mode = 0; 533 while ((m = nextopt("lp"))) 534 if (m == 'l') 535 mode = SHOW_PID; 536 else 537 mode = SHOW_PGID; 538 if (!iflag) 539 mode |= SHOW_NO_FREE; 540 if (*argptr) 541 do 542 showjob(out1, getjob(*argptr,0), mode); 543 while (*++argptr); 544 else 545 showjobs(out1, mode); 546 return 0; 547 } 548 549 550 /* 551 * Print a list of jobs. If "change" is nonzero, only print jobs whose 552 * statuses have changed since the last call to showjobs. 553 * 554 * If the shell is interrupted in the process of creating a job, the 555 * result may be a job structure containing zero processes. Such structures 556 * will be freed here. 557 */ 558 559 void 560 showjobs(struct output *out, int mode) 561 { 562 int jobno; 563 struct job *jp; 564 int silent = 0, gotpid; 565 566 CTRACE(DBG_JOBS, ("showjobs(%x) called\n", mode)); 567 568 /* If not even one one job changed, there is nothing to do */ 569 gotpid = dowait(WSILENT, NULL, NULL); 570 while (dowait(WSILENT, NULL, NULL) > 0) 571 continue; 572 #ifdef JOBS 573 /* 574 * Check if we are not in our foreground group, and if not 575 * put us in it. 576 */ 577 if (mflag && gotpid != -1 && tcgetpgrp(ttyfd) != getpid()) { 578 if (tcsetpgrp(ttyfd, getpid()) == -1) 579 error("Cannot set tty process group (%s) at %d", 580 strerror(errno), __LINE__); 581 VTRACE(DBG_JOBS|DBG_INPUT, ("repaired tty process group\n")); 582 silent = 1; 583 } 584 #endif 585 586 for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) { 587 if (!jp->used) 588 continue; 589 if (jp->nprocs == 0) { 590 if (!jobs_invalid) 591 freejob(jp); 592 continue; 593 } 594 if ((mode & SHOW_CHANGED) && !(jp->flags & JOBCHANGED)) 595 continue; 596 if (silent && (jp->flags & JOBCHANGED)) { 597 jp->flags &= ~JOBCHANGED; 598 continue; 599 } 600 showjob(out, jp, mode); 601 } 602 } 603 604 /* 605 * Mark a job structure as unused. 606 */ 607 608 STATIC void 609 freejob(struct job *jp) 610 { 611 INTOFF; 612 if (jp->ps != &jp->ps0) { 613 ckfree(jp->ps); 614 jp->ps = &jp->ps0; 615 } 616 jp->nprocs = 0; 617 jp->used = 0; 618 #if JOBS 619 set_curjob(jp, 0); 620 #endif 621 INTON; 622 } 623 624 /* 625 * Extract the status of a completed job (for $?) 626 */ 627 STATIC int 628 jobstatus(const struct job *jp, int raw) 629 { 630 int status = 0; 631 int retval; 632 633 if ((jp->flags & JPIPEFAIL) && jp->nprocs) { 634 int i; 635 636 for (i = 0; i < jp->nprocs; i++) 637 if (jp->ps[i].status != 0) 638 status = jp->ps[i].status; 639 } else 640 status = jp->ps[jp->nprocs ? jp->nprocs - 1 : 0].status; 641 642 if (raw) 643 return status; 644 645 if (WIFEXITED(status)) 646 retval = WEXITSTATUS(status); 647 #if JOBS 648 else if (WIFSTOPPED(status)) 649 retval = WSTOPSIG(status) + 128; 650 #endif 651 else { 652 /* XXX: limits number of signals */ 653 retval = WTERMSIG(status) + 128; 654 } 655 656 return retval; 657 } 658 659 660 661 int 662 waitcmd(int argc, char **argv) 663 { 664 struct job *job, *last; 665 int retval; 666 struct job *jp; 667 int i; 668 int any = 0; 669 int found; 670 char *pid = NULL, *fpid; 671 char **arg; 672 char idstring[20]; 673 674 while ((i = nextopt("np:")) != '\0') { 675 switch (i) { 676 case 'n': 677 any = 1; 678 break; 679 case 'p': 680 if (pid) 681 error("more than one -p unsupported"); 682 pid = optionarg; 683 break; 684 } 685 } 686 687 if (pid != NULL) { 688 if (!validname(pid, '\0', NULL)) 689 error("invalid name: -p '%s'", pid); 690 if (unsetvar(pid, 0)) 691 error("%s readonly", pid); 692 } 693 694 /* 695 * If we have forked, and not yet created any new jobs, then 696 * we have no children, whatever jobtab claims, 697 * so simply return in that case. 698 * 699 * The return code is 127 if we had any pid args (none are found) 700 * or if we had -n (nothing exited), but 0 for plain old "wait". 701 */ 702 if (jobs_invalid) { 703 CTRACE(DBG_WAIT, ("builtin wait%s%s in child, invalid jobtab\n", 704 any ? " -n" : "", *argptr ? " pid..." : "")); 705 return (any || *argptr) ? 127 : 0; 706 } 707 708 /* clear stray flags left from previous waitcmd */ 709 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 710 jp->flags &= ~JOBWANTED; 711 jp->ref = NULL; 712 } 713 714 CTRACE(DBG_WAIT, 715 ("builtin wait%s%s\n", any ? " -n" : "", *argptr ? " pid..." : "")); 716 717 /* 718 * First, validate the jobnum args, count how many refer to 719 * (different) running jobs, and if we had -n, and found that one has 720 * already finished, we return that one. Otherwise remember 721 * which ones we are looking for (JOBWANTED). 722 */ 723 found = 0; 724 last = NULL; 725 for (arg = argptr; *arg; arg++) { 726 last = jp = getjob(*arg, 1); 727 if (!jp) 728 continue; 729 if (jp->ref == NULL) 730 jp->ref = *arg; 731 if (any && jp->state == JOBDONE) { 732 /* 733 * We just want any of them, and this one is 734 * ready for consumption, bon apetit ... 735 */ 736 retval = jobstatus(jp, 0); 737 if (pid) 738 setvar(pid, *arg, 0); 739 if (!iflag) 740 freejob(jp); 741 CTRACE(DBG_WAIT, ("wait -n found %s already done: %d\n", *arg, retval)); 742 return retval; 743 } 744 if (!(jp->flags & JOBWANTED)) { 745 /* 746 * It is possible to list the same job several 747 * times - the obvious "wait 1 1 1" or 748 * "wait %% %2 102" where job 2 is current and pid 102 749 * However many times it is requested, it is found once. 750 */ 751 found++; 752 jp->flags |= JOBWANTED; 753 } 754 job = jp; 755 } 756 757 VTRACE(DBG_WAIT, ("wait %s%s%sfound %d candidates (last %s)\n", 758 any ? "-n " : "", *argptr ? *argptr : "", 759 argptr[0] && argptr[1] ? "... " : " ", found, 760 job ? (job->ref ? job->ref : "<no-arg>") : "none")); 761 762 /* 763 * If we were given a list of jobnums: 764 * and none of those exist, then we're done. 765 */ 766 if (*argptr && found == 0) 767 return 127; 768 769 /* 770 * Otherwise we need to wait for something to complete 771 * When it does, we check and see if it is one of the 772 * jobs we're waiting on, and if so, we clean it up. 773 * If we had -n, then we're done, otherwise we do it all again 774 * until all we had listed are done, of if there were no 775 * jobnum args, all are done. 776 */ 777 778 retval = any || *argptr ? 127 : 0; 779 fpid = NULL; 780 for (;;) { 781 VTRACE(DBG_WAIT, ("wait waiting (%d remain): ", found)); 782 for (jp = jobtab, i = njobs; --i >= 0; jp++) { 783 if (jp->used && jp->flags & JOBWANTED && 784 jp->state == JOBDONE) 785 break; 786 if (jp->used && jp->state == JOBRUNNING) 787 break; 788 } 789 if (i < 0) { 790 CTRACE(DBG_WAIT, ("nothing running (ret: %d) fpid %s\n", 791 retval, fpid ? fpid : "unset")); 792 if (pid && fpid) 793 setvar(pid, fpid, 0); 794 return retval; 795 } 796 VTRACE(DBG_WAIT, ("found @%d/%d state: %d\n", njobs-i, njobs, 797 jp->state)); 798 799 /* 800 * There is at least 1 job running, so we can 801 * safely wait() for something to exit. 802 */ 803 if (jp->state == JOBRUNNING) { 804 job = NULL; 805 if ((i = dowait(WBLOCK|WNOFREE, NULL, &job)) == -1) 806 return 128 + lastsig(); 807 808 /* 809 * one of the job's processes exited, 810 * but there are more 811 */ 812 if (job->state == JOBRUNNING) 813 continue; 814 } else 815 job = jp; /* we want this, and it is done */ 816 817 if (job->flags & JOBWANTED || (*argptr == 0 && any)) { 818 int rv; 819 820 job->flags &= ~JOBWANTED; /* got it */ 821 rv = jobstatus(job, 0); 822 VTRACE(DBG_WAIT, ( 823 "wanted %d (%s) done: st=%d", i, 824 job->ref ? job->ref : "", rv)); 825 if (any || job == last) { 826 retval = rv; 827 fpid = job->ref; 828 829 VTRACE(DBG_WAIT, (" save")); 830 if (pid) { 831 /* 832 * don't need fpid unless we are going 833 * to return it. 834 */ 835 if (fpid == NULL) { 836 /* 837 * this only happens with "wait -n" 838 * (that is, no pid args) 839 */ 840 snprintf(idstring, sizeof idstring, 841 "%d", job->ps[ job->nprocs ? 842 job->nprocs-1 : 843 0 ].pid); 844 fpid = idstring; 845 } 846 VTRACE(DBG_WAIT, (" (for %s)", fpid)); 847 } 848 } 849 850 if (job->state == JOBDONE) { 851 VTRACE(DBG_WAIT, (" free")); 852 freejob(job); 853 } 854 855 if (any || (found > 0 && --found == 0)) { 856 if (pid && fpid) 857 setvar(pid, fpid, 0); 858 VTRACE(DBG_WAIT, (" return %d\n", retval)); 859 return retval; 860 } 861 VTRACE(DBG_WAIT, ("\n")); 862 continue; 863 } 864 865 /* this is to handle "wait" (no args) */ 866 if (found == 0 && job->state == JOBDONE) { 867 VTRACE(DBG_JOBS|DBG_WAIT, ("Cleanup: %d\n", i)); 868 freejob(job); 869 } 870 } 871 } 872 873 874 int 875 jobidcmd(int argc, char **argv) 876 { 877 struct job *jp; 878 int i; 879 int pg = 0, onep = 0, job = 0; 880 881 while ((i = nextopt("gjp"))) { 882 switch (i) { 883 case 'g': pg = 1; break; 884 case 'j': job = 1; break; 885 case 'p': onep = 1; break; 886 } 887 } 888 CTRACE(DBG_JOBS, ("jobidcmd%s%s%s%s %s\n", pg ? " -g" : "", 889 onep ? " -p" : "", job ? " -j" : "", jobs_invalid ? " [inv]" : "", 890 *argptr ? *argptr : "<implicit %%>")); 891 if (pg + onep + job > 1) 892 error("-g -j and -p options cannot be combined"); 893 894 if (argptr[0] && argptr[1]) 895 error("usage: jobid [-g|-p|-r] jobid"); 896 897 jp = getjob(*argptr, 0); 898 if (job) { 899 out1fmt("%%%zu\n", (size_t)(jp - jobtab + 1)); 900 return 0; 901 } 902 if (pg) { 903 if (jp->pgrp != 0) { 904 out1fmt("%ld\n", (long)jp->pgrp); 905 return 0; 906 } 907 return 1; 908 } 909 if (onep) { 910 i = jp->nprocs - 1; 911 if (i < 0) 912 return 1; 913 out1fmt("%ld\n", (long)jp->ps[i].pid); 914 return 0; 915 } 916 for (i = 0 ; i < jp->nprocs ; ) { 917 out1fmt("%ld", (long)jp->ps[i].pid); 918 out1c(++i < jp->nprocs ? ' ' : '\n'); 919 } 920 return 0; 921 } 922 923 int 924 getjobpgrp(const char *name) 925 { 926 struct job *jp; 927 928 if (jobs_invalid) 929 error("No such job: %s", name); 930 jp = getjob(name, 1); 931 if (jp == 0) 932 return 0; 933 return -jp->ps[0].pid; 934 } 935 936 /* 937 * Convert a job name to a job structure. 938 */ 939 940 STATIC struct job * 941 getjob(const char *name, int noerror) 942 { 943 int jobno = -1; 944 struct job *jp; 945 int pid; 946 int i; 947 const char *err_msg = "No such job: %s"; 948 949 if (name == NULL) { 950 #if JOBS 951 jobno = curjob; 952 #endif 953 err_msg = "No current job"; 954 } else if (name[0] == '%') { 955 if (is_number(name + 1)) { 956 jobno = number(name + 1) - 1; 957 } else if (!name[1] || !name[2]) { 958 switch (name[1]) { 959 #if JOBS 960 case 0: 961 case '+': 962 case '%': 963 jobno = curjob; 964 err_msg = "No current job"; 965 break; 966 case '-': 967 jobno = curjob; 968 if (jobno != -1) 969 jobno = jobtab[jobno].prev_job; 970 err_msg = "No previous job"; 971 break; 972 #endif 973 default: 974 goto check_pattern; 975 } 976 } else { 977 struct job *found; 978 check_pattern: 979 found = NULL; 980 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 981 if (!jp->used || jp->nprocs <= 0) 982 continue; 983 if ((name[1] == '?' 984 && strstr(jp->ps[0].cmd, name + 2)) 985 || prefix(name + 1, jp->ps[0].cmd)) { 986 if (found) { 987 err_msg = "%s: ambiguous"; 988 found = 0; 989 break; 990 } 991 found = jp; 992 } 993 } 994 if (found) 995 return found; 996 } 997 998 } else if (is_number(name)) { 999 pid = number(name); 1000 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 1001 if (jp->used && jp->nprocs > 0 1002 && jp->ps[jp->nprocs - 1].pid == pid) 1003 return jp; 1004 } 1005 } 1006 1007 if (jobno >= 0 && jobno < njobs) { 1008 jp = jobtab + jobno; 1009 if (jp->used) 1010 return jp; 1011 } 1012 if (!noerror) 1013 error(err_msg, name); 1014 return 0; 1015 } 1016 1017 1018 1019 /* 1020 * Return a new job structure, 1021 */ 1022 1023 struct job * 1024 makejob(union node *node, int nprocs) 1025 { 1026 int i; 1027 struct job *jp; 1028 1029 if (jobs_invalid) { 1030 for (i = njobs, jp = jobtab ; --i >= 0 ; jp++) { 1031 if (jp->used) 1032 freejob(jp); 1033 } 1034 jobs_invalid = 0; 1035 } 1036 1037 for (i = njobs, jp = jobtab ; ; jp++) { 1038 if (--i < 0) { 1039 INTOFF; 1040 if (njobs == 0) { 1041 jobtab = ckmalloc(4 * sizeof jobtab[0]); 1042 } else { 1043 jp = ckmalloc((njobs + 4) * sizeof jobtab[0]); 1044 memcpy(jp, jobtab, njobs * sizeof jp[0]); 1045 /* Relocate `ps' pointers */ 1046 for (i = 0; i < njobs; i++) 1047 if (jp[i].ps == &jobtab[i].ps0) 1048 jp[i].ps = &jp[i].ps0; 1049 ckfree(jobtab); 1050 jobtab = jp; 1051 } 1052 jp = jobtab + njobs; 1053 for (i = 4 ; --i >= 0 ; njobs++) { 1054 jobtab[njobs].used = 0; 1055 jobtab[njobs].prev_job = -1; 1056 } 1057 INTON; 1058 break; 1059 } 1060 if (jp->used == 0) 1061 break; 1062 } 1063 INTOFF; 1064 jp->state = JOBRUNNING; 1065 jp->used = 1; 1066 jp->flags = pipefail ? JPIPEFAIL : 0; 1067 jp->nprocs = 0; 1068 jp->pgrp = 0; 1069 #if JOBS 1070 jp->jobctl = jobctl; 1071 set_curjob(jp, 1); 1072 #endif 1073 if (nprocs > 1) { 1074 jp->ps = ckmalloc(nprocs * sizeof (struct procstat)); 1075 } else { 1076 jp->ps = &jp->ps0; 1077 } 1078 INTON; 1079 VTRACE(DBG_JOBS, ("makejob(%p, %d)%s returns %%%d\n", (void *)node, 1080 nprocs, (jp->flags&JPIPEFAIL)?" PF":"", jp - jobtab + 1)); 1081 return jp; 1082 } 1083 1084 1085 /* 1086 * Fork off a subshell. If we are doing job control, give the subshell its 1087 * own process group. Jp is a job structure that the job is to be added to. 1088 * N is the command that will be evaluated by the child. Both jp and n may 1089 * be NULL. The mode parameter can be one of the following: 1090 * FORK_FG - Fork off a foreground process. 1091 * FORK_BG - Fork off a background process. 1092 * FORK_NOJOB - Like FORK_FG, but don't give the process its own 1093 * process group even if job control is on. 1094 * 1095 * When job control is turned off, background processes have their standard 1096 * input redirected to /dev/null (except for the second and later processes 1097 * in a pipeline). 1098 */ 1099 1100 int 1101 forkshell(struct job *jp, union node *n, int mode) 1102 { 1103 pid_t pid; 1104 int serrno; 1105 1106 CTRACE(DBG_JOBS, ("forkshell(%%%d, %p, %d) called\n", 1107 jp - jobtab, n, mode)); 1108 1109 switch ((pid = fork())) { 1110 case -1: 1111 serrno = errno; 1112 VTRACE(DBG_JOBS, ("Fork failed, errno=%d\n", serrno)); 1113 error("Cannot fork (%s)", strerror(serrno)); 1114 break; 1115 case 0: 1116 SHELL_FORKED(); 1117 forkchild(jp, n, mode, 0); 1118 return 0; 1119 default: 1120 return forkparent(jp, n, mode, pid); 1121 } 1122 } 1123 1124 int 1125 forkparent(struct job *jp, union node *n, int mode, pid_t pid) 1126 { 1127 int pgrp; 1128 1129 if (rootshell && mode != FORK_NOJOB && mflag) { 1130 if (jp == NULL || jp->nprocs == 0) 1131 pgrp = pid; 1132 else 1133 pgrp = jp->ps[0].pid; 1134 jp->pgrp = pgrp; 1135 /* This can fail because we are doing it in the child also */ 1136 (void)setpgid(pid, pgrp); 1137 } 1138 if (mode == FORK_BG) 1139 backgndpid = pid; /* set $! */ 1140 if (jp) { 1141 struct procstat *ps = &jp->ps[jp->nprocs++]; 1142 ps->pid = pid; 1143 ps->status = -1; 1144 ps->cmd[0] = 0; 1145 if (/* iflag && rootshell && */ n) 1146 commandtext(ps, n); 1147 } 1148 CTRACE(DBG_JOBS, ("In parent shell: child = %d (mode %d)\n",pid,mode)); 1149 return pid; 1150 } 1151 1152 void 1153 forkchild(struct job *jp, union node *n, int mode, int vforked) 1154 { 1155 int wasroot; 1156 int pgrp; 1157 const char *devnull = _PATH_DEVNULL; 1158 const char *nullerr = "Can't open %s"; 1159 1160 wasroot = rootshell; 1161 CTRACE(DBG_JOBS, ("Child shell %d %sforked from %d (mode %d)\n", 1162 getpid(), vforked?"v":"", getppid(), mode)); 1163 1164 if (!vforked) { 1165 rootshell = 0; 1166 handler = &main_handler; 1167 } 1168 1169 closescript(vforked); 1170 clear_traps(vforked); 1171 #if JOBS 1172 if (!vforked) 1173 jobctl = 0; /* do job control only in root shell */ 1174 if (wasroot && mode != FORK_NOJOB && mflag) { 1175 if (jp == NULL || jp->nprocs == 0) 1176 pgrp = getpid(); 1177 else 1178 pgrp = jp->ps[0].pid; 1179 /* This can fail because we are doing it in the parent also */ 1180 (void)setpgid(0, pgrp); 1181 if (mode == FORK_FG) { 1182 if (tcsetpgrp(ttyfd, pgrp) == -1) 1183 error("Cannot set tty process group (%s) at %d", 1184 strerror(errno), __LINE__); 1185 } 1186 setsignal(SIGTSTP, vforked); 1187 setsignal(SIGTTOU, vforked); 1188 } else if (mode == FORK_BG) { 1189 ignoresig(SIGINT, vforked); 1190 ignoresig(SIGQUIT, vforked); 1191 if ((jp == NULL || jp->nprocs == 0) && 1192 ! fd0_redirected_p ()) { 1193 close(0); 1194 if (open(devnull, O_RDONLY) != 0) 1195 error(nullerr, devnull); 1196 } 1197 } 1198 #else 1199 if (mode == FORK_BG) { 1200 ignoresig(SIGINT, vforked); 1201 ignoresig(SIGQUIT, vforked); 1202 if ((jp == NULL || jp->nprocs == 0) && 1203 ! fd0_redirected_p ()) { 1204 close(0); 1205 if (open(devnull, O_RDONLY) != 0) 1206 error(nullerr, devnull); 1207 } 1208 } 1209 #endif 1210 if (wasroot && iflag) { 1211 setsignal(SIGINT, vforked); 1212 setsignal(SIGQUIT, vforked); 1213 setsignal(SIGTERM, vforked); 1214 } 1215 1216 if (!vforked) 1217 jobs_invalid = 1; 1218 } 1219 1220 /* 1221 * Wait for job to finish. 1222 * 1223 * Under job control we have the problem that while a child process is 1224 * running interrupts generated by the user are sent to the child but not 1225 * to the shell. This means that an infinite loop started by an inter- 1226 * active user may be hard to kill. With job control turned off, an 1227 * interactive user may place an interactive program inside a loop. If 1228 * the interactive program catches interrupts, the user doesn't want 1229 * these interrupts to also abort the loop. The approach we take here 1230 * is to have the shell ignore interrupt signals while waiting for a 1231 * forground process to terminate, and then send itself an interrupt 1232 * signal if the child process was terminated by an interrupt signal. 1233 * Unfortunately, some programs want to do a bit of cleanup and then 1234 * exit on interrupt; unless these processes terminate themselves by 1235 * sending a signal to themselves (instead of calling exit) they will 1236 * confuse this approach. 1237 */ 1238 1239 int 1240 waitforjob(struct job *jp) 1241 { 1242 #if JOBS 1243 int mypgrp = getpgrp(); 1244 #endif 1245 int status; 1246 int st; 1247 1248 INTOFF; 1249 VTRACE(DBG_JOBS, ("waitforjob(%%%d) called\n", jp - jobtab + 1)); 1250 while (jp->state == JOBRUNNING) { 1251 dowait(WBLOCK, jp, NULL); 1252 } 1253 #if JOBS 1254 if (jp->jobctl) { 1255 if (tcsetpgrp(ttyfd, mypgrp) == -1) 1256 error("Cannot set tty process group (%s) at %d", 1257 strerror(errno), __LINE__); 1258 } 1259 if (jp->state == JOBSTOPPED && curjob != jp - jobtab) 1260 set_curjob(jp, 2); 1261 #endif 1262 status = jobstatus(jp, 1); 1263 1264 /* convert to 8 bits */ 1265 if (WIFEXITED(status)) 1266 st = WEXITSTATUS(status); 1267 #if JOBS 1268 else if (WIFSTOPPED(status)) 1269 st = WSTOPSIG(status) + 128; 1270 #endif 1271 else 1272 st = WTERMSIG(status) + 128; 1273 1274 VTRACE(DBG_JOBS, ("waitforjob: job %d, nproc %d, status %d, st %x\n", 1275 jp - jobtab + 1, jp->nprocs, status, st)); 1276 #if JOBS 1277 if (jp->jobctl) { 1278 /* 1279 * This is truly gross. 1280 * If we're doing job control, then we did a TIOCSPGRP which 1281 * caused us (the shell) to no longer be in the controlling 1282 * session -- so we wouldn't have seen any ^C/SIGINT. So, we 1283 * intuit from the subprocess exit status whether a SIGINT 1284 * occurred, and if so interrupt ourselves. Yuck. - mycroft 1285 */ 1286 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGINT) 1287 raise(SIGINT); 1288 } 1289 #endif 1290 if (! JOBS || jp->state == JOBDONE) 1291 freejob(jp); 1292 INTON; 1293 return st; 1294 } 1295 1296 1297 1298 /* 1299 * Wait for a process to terminate. 1300 */ 1301 1302 STATIC int 1303 dowait(int flags, struct job *job, struct job **changed) 1304 { 1305 int pid; 1306 int status; 1307 struct procstat *sp; 1308 struct job *jp; 1309 struct job *thisjob; 1310 int done; 1311 int stopped; 1312 1313 VTRACE(DBG_JOBS|DBG_PROCS, ("dowait(%x) called\n", flags)); 1314 1315 if (changed != NULL) 1316 *changed = NULL; 1317 1318 do { 1319 pid = waitproc(flags & WBLOCK, job, &status); 1320 VTRACE(DBG_JOBS|DBG_PROCS, ("wait returns pid %d, status %#x\n", 1321 pid, status)); 1322 } while (pid == -1 && errno == EINTR && pendingsigs == 0); 1323 if (pid <= 0) 1324 return pid; 1325 INTOFF; 1326 thisjob = NULL; 1327 for (jp = jobtab ; jp < jobtab + njobs ; jp++) { 1328 if (jp->used) { 1329 done = 1; 1330 stopped = 1; 1331 for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) { 1332 if (sp->pid == -1) 1333 continue; 1334 if (sp->pid == pid && 1335 (sp->status==-1 || WIFSTOPPED(sp->status))) { 1336 VTRACE(DBG_JOBS | DBG_PROCS, 1337 ("Job %d: changing status of proc %d from %#x to %#x\n", 1338 jp - jobtab + 1, pid, 1339 sp->status, status)); 1340 if (WIFCONTINUED(status)) { 1341 if (sp->status != -1) 1342 jp->flags |= JOBCHANGED; 1343 sp->status = -1; 1344 jp->state = 0; 1345 } else 1346 sp->status = status; 1347 thisjob = jp; 1348 if (changed != NULL) 1349 *changed = jp; 1350 } 1351 if (sp->status == -1) 1352 stopped = 0; 1353 else if (WIFSTOPPED(sp->status)) 1354 done = 0; 1355 } 1356 if (stopped) { /* stopped or done */ 1357 int state = done ? JOBDONE : JOBSTOPPED; 1358 1359 if (jp->state != state) { 1360 VTRACE(DBG_JOBS, 1361 ("Job %d: changing state from %d to %d\n", 1362 jp - jobtab + 1, jp->state, state)); 1363 jp->state = state; 1364 #if JOBS 1365 if (done) 1366 set_curjob(jp, 0); 1367 #endif 1368 } 1369 } 1370 } 1371 } 1372 1373 if (thisjob && 1374 (thisjob->state != JOBRUNNING || thisjob->flags & JOBCHANGED)) { 1375 int mode = 0; 1376 1377 if (!rootshell || !iflag) 1378 mode = SHOW_SIGNALLED; 1379 if ((job == thisjob && (flags & WNOFREE) == 0) || 1380 job != thisjob) 1381 mode = SHOW_SIGNALLED | SHOW_NO_FREE; 1382 if (mode && (flags & WSILENT) == 0) 1383 showjob(out2, thisjob, mode); 1384 else { 1385 VTRACE(DBG_JOBS, 1386 ("Not printing status, rootshell=%d, job=%p\n", 1387 rootshell, job)); 1388 thisjob->flags |= JOBCHANGED; 1389 } 1390 } 1391 1392 INTON; 1393 return pid; 1394 } 1395 1396 1397 1398 /* 1399 * Do a wait system call. If job control is compiled in, we accept 1400 * stopped processes. If block is zero, we return a value of zero 1401 * rather than blocking. 1402 * 1403 * System V doesn't have a non-blocking wait system call. It does 1404 * have a SIGCLD signal that is sent to a process when one of its 1405 * children dies. The obvious way to use SIGCLD would be to install 1406 * a handler for SIGCLD which simply bumped a counter when a SIGCLD 1407 * was received, and have waitproc bump another counter when it got 1408 * the status of a process. Waitproc would then know that a wait 1409 * system call would not block if the two counters were different. 1410 * This approach doesn't work because if a process has children that 1411 * have not been waited for, System V will send it a SIGCLD when it 1412 * installs a signal handler for SIGCLD. What this means is that when 1413 * a child exits, the shell will be sent SIGCLD signals continuously 1414 * until is runs out of stack space, unless it does a wait call before 1415 * restoring the signal handler. The code below takes advantage of 1416 * this (mis)feature by installing a signal handler for SIGCLD and 1417 * then checking to see whether it was called. If there are any 1418 * children to be waited for, it will be. 1419 * 1420 * If neither SYSV nor BSD is defined, we don't implement nonblocking 1421 * waits at all. In this case, the user will not be informed when 1422 * a background process until the next time she runs a real program 1423 * (as opposed to running a builtin command or just typing return), 1424 * and the jobs command may give out of date information. 1425 */ 1426 1427 #ifdef SYSV 1428 STATIC int gotsigchild; 1429 1430 STATIC int onsigchild() { 1431 gotsigchild = 1; 1432 } 1433 #endif 1434 1435 1436 STATIC int 1437 waitproc(int block, struct job *jp, int *status) 1438 { 1439 #ifdef BSD 1440 int flags = 0; 1441 1442 #if JOBS 1443 if (mflag || (jp != NULL && jp->jobctl)) 1444 flags |= WUNTRACED | WCONTINUED; 1445 #endif 1446 if (block == 0) 1447 flags |= WNOHANG; 1448 VTRACE(DBG_WAIT, ("waitproc: doing waitpid(flags=%#x)\n", flags)); 1449 return waitpid(-1, status, flags); 1450 #else 1451 #ifdef SYSV 1452 int (*save)(); 1453 1454 if (block == 0) { 1455 gotsigchild = 0; 1456 save = signal(SIGCLD, onsigchild); 1457 signal(SIGCLD, save); 1458 if (gotsigchild == 0) 1459 return 0; 1460 } 1461 return wait(status); 1462 #else 1463 if (block == 0) 1464 return 0; 1465 return wait(status); 1466 #endif 1467 #endif 1468 } 1469 1470 /* 1471 * return 1 if there are stopped jobs, otherwise 0 1472 */ 1473 int job_warning = 0; 1474 int 1475 stoppedjobs(void) 1476 { 1477 int jobno; 1478 struct job *jp; 1479 1480 if (job_warning || jobs_invalid) 1481 return (0); 1482 for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) { 1483 if (jp->used == 0) 1484 continue; 1485 if (jp->state == JOBSTOPPED) { 1486 out2str("You have stopped jobs.\n"); 1487 job_warning = 2; 1488 return (1); 1489 } 1490 } 1491 1492 return (0); 1493 } 1494 1495 /* 1496 * Return a string identifying a command (to be printed by the 1497 * jobs command). 1498 */ 1499 1500 STATIC char *cmdnextc; 1501 STATIC int cmdnleft; 1502 1503 void 1504 commandtext(struct procstat *ps, union node *n) 1505 { 1506 int len; 1507 1508 cmdnextc = ps->cmd; 1509 if (iflag || mflag || sizeof(ps->cmd) <= 60) 1510 len = sizeof(ps->cmd); 1511 else if (sizeof ps->cmd <= 400) 1512 len = 50; 1513 else if (sizeof ps->cmd <= 800) 1514 len = 80; 1515 else 1516 len = sizeof(ps->cmd) / 10; 1517 cmdnleft = len; 1518 cmdtxt(n); 1519 if (cmdnleft <= 0) { 1520 char *p = ps->cmd + len - 4; 1521 p[0] = '.'; 1522 p[1] = '.'; 1523 p[2] = '.'; 1524 p[3] = 0; 1525 } else 1526 *cmdnextc = '\0'; 1527 1528 VTRACE(DBG_JOBS, 1529 ("commandtext: ps->cmd %p, end %p, left %d\n\t\"%s\"\n", 1530 ps->cmd, cmdnextc, cmdnleft, ps->cmd)); 1531 } 1532 1533 1534 STATIC void 1535 cmdtxt(union node *n) 1536 { 1537 union node *np; 1538 struct nodelist *lp; 1539 const char *p; 1540 int i; 1541 1542 if (n == NULL || cmdnleft <= 0) 1543 return; 1544 switch (n->type) { 1545 case NSEMI: 1546 cmdtxt(n->nbinary.ch1); 1547 cmdputs("; "); 1548 cmdtxt(n->nbinary.ch2); 1549 break; 1550 case NAND: 1551 cmdtxt(n->nbinary.ch1); 1552 cmdputs(" && "); 1553 cmdtxt(n->nbinary.ch2); 1554 break; 1555 case NOR: 1556 cmdtxt(n->nbinary.ch1); 1557 cmdputs(" || "); 1558 cmdtxt(n->nbinary.ch2); 1559 break; 1560 case NDNOT: 1561 cmdputs("! "); 1562 /* FALLTHROUGH */ 1563 case NNOT: 1564 cmdputs("! "); 1565 cmdtxt(n->nnot.com); 1566 break; 1567 case NPIPE: 1568 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 1569 cmdtxt(lp->n); 1570 if (lp->next) 1571 cmdputs(" | "); 1572 } 1573 if (n->npipe.backgnd) 1574 cmdputs(" &"); 1575 break; 1576 case NSUBSHELL: 1577 cmdputs("("); 1578 cmdtxt(n->nredir.n); 1579 cmdputs(")"); 1580 break; 1581 case NREDIR: 1582 case NBACKGND: 1583 cmdtxt(n->nredir.n); 1584 break; 1585 case NIF: 1586 cmdputs("if "); 1587 cmdtxt(n->nif.test); 1588 cmdputs("; then "); 1589 cmdtxt(n->nif.ifpart); 1590 if (n->nif.elsepart) { 1591 cmdputs("; else "); 1592 cmdtxt(n->nif.elsepart); 1593 } 1594 cmdputs("; fi"); 1595 break; 1596 case NWHILE: 1597 cmdputs("while "); 1598 goto until; 1599 case NUNTIL: 1600 cmdputs("until "); 1601 until: 1602 cmdtxt(n->nbinary.ch1); 1603 cmdputs("; do "); 1604 cmdtxt(n->nbinary.ch2); 1605 cmdputs("; done"); 1606 break; 1607 case NFOR: 1608 cmdputs("for "); 1609 cmdputs(n->nfor.var); 1610 cmdputs(" in "); 1611 cmdlist(n->nfor.args, 1); 1612 cmdputs("; do "); 1613 cmdtxt(n->nfor.body); 1614 cmdputs("; done"); 1615 break; 1616 case NCASE: 1617 cmdputs("case "); 1618 cmdputs(n->ncase.expr->narg.text); 1619 cmdputs(" in "); 1620 for (np = n->ncase.cases; np; np = np->nclist.next) { 1621 cmdtxt(np->nclist.pattern); 1622 cmdputs(") "); 1623 cmdtxt(np->nclist.body); 1624 switch (n->type) { /* switch (not if) for later */ 1625 case NCLISTCONT: 1626 cmdputs(";& "); 1627 break; 1628 default: 1629 cmdputs(";; "); 1630 break; 1631 } 1632 } 1633 cmdputs("esac"); 1634 break; 1635 case NDEFUN: 1636 cmdputs(n->narg.text); 1637 cmdputs("() { ... }"); 1638 break; 1639 case NCMD: 1640 cmdlist(n->ncmd.args, 1); 1641 cmdlist(n->ncmd.redirect, 0); 1642 if (n->ncmd.backgnd) 1643 cmdputs(" &"); 1644 break; 1645 case NARG: 1646 cmdputs(n->narg.text); 1647 break; 1648 case NTO: 1649 p = ">"; i = 1; goto redir; 1650 case NCLOBBER: 1651 p = ">|"; i = 1; goto redir; 1652 case NAPPEND: 1653 p = ">>"; i = 1; goto redir; 1654 case NTOFD: 1655 p = ">&"; i = 1; goto redir; 1656 case NFROM: 1657 p = "<"; i = 0; goto redir; 1658 case NFROMFD: 1659 p = "<&"; i = 0; goto redir; 1660 case NFROMTO: 1661 p = "<>"; i = 0; goto redir; 1662 redir: 1663 if (n->nfile.fd != i) 1664 cmdputi(n->nfile.fd); 1665 cmdputs(p); 1666 if (n->type == NTOFD || n->type == NFROMFD) { 1667 if (n->ndup.dupfd < 0) 1668 cmdputs("-"); 1669 else 1670 cmdputi(n->ndup.dupfd); 1671 } else { 1672 cmdtxt(n->nfile.fname); 1673 } 1674 break; 1675 case NHERE: 1676 case NXHERE: 1677 cmdputs("<<..."); 1678 break; 1679 default: 1680 cmdputs("???"); 1681 break; 1682 } 1683 } 1684 1685 STATIC void 1686 cmdlist(union node *np, int sep) 1687 { 1688 for (; np; np = np->narg.next) { 1689 if (!sep) 1690 cmdputs(" "); 1691 cmdtxt(np); 1692 if (sep && np->narg.next) 1693 cmdputs(" "); 1694 } 1695 } 1696 1697 1698 STATIC void 1699 cmdputs(const char *s) 1700 { 1701 const char *p, *str = 0; 1702 char c, cc[2] = " "; 1703 char *nextc; 1704 int nleft; 1705 int subtype = 0; 1706 int quoted = 0; 1707 static char vstype[16][4] = { "", "}", "-", "+", "?", "=", 1708 "#", "##", "%", "%%", "}" }; 1709 1710 p = s; 1711 nextc = cmdnextc; 1712 nleft = cmdnleft; 1713 while (nleft > 0 && (c = *p++) != 0) { 1714 switch (c) { 1715 case CTLNONL: 1716 c = '\0'; 1717 break; 1718 case CTLESC: 1719 c = *p++; 1720 break; 1721 case CTLVAR: 1722 subtype = *p++; 1723 if (subtype & VSLINENO) { /* undo LINENO hack */ 1724 if ((subtype & VSTYPE) == VSLENGTH) 1725 str = "${#LINENO"; /*}*/ 1726 else 1727 str = "${LINENO"; /*}*/ 1728 while (is_digit(*p)) 1729 p++; 1730 } else if ((subtype & VSTYPE) == VSLENGTH) 1731 str = "${#"; /*}*/ 1732 else 1733 str = "${"; /*}*/ 1734 if (!(subtype & VSQUOTE) != !(quoted & 1)) { 1735 quoted ^= 1; 1736 c = '"'; 1737 } else { 1738 c = *str++; 1739 } 1740 break; 1741 case CTLENDVAR: /*{*/ 1742 c = '}'; 1743 if (quoted & 1) 1744 str = "\""; 1745 quoted >>= 1; 1746 subtype = 0; 1747 break; 1748 case CTLBACKQ: 1749 c = '$'; 1750 str = "(...)"; 1751 break; 1752 case CTLBACKQ+CTLQUOTE: 1753 c = '"'; 1754 str = "$(...)\""; 1755 break; 1756 case CTLARI: 1757 c = '$'; 1758 if (*p == ' ') 1759 p++; 1760 str = "(("; /*))*/ 1761 break; 1762 case CTLENDARI: /*((*/ 1763 c = ')'; 1764 str = ")"; 1765 break; 1766 case CTLQUOTEMARK: 1767 quoted ^= 1; 1768 c = '"'; 1769 break; 1770 case CTLQUOTEEND: 1771 quoted >>= 1; 1772 c = '"'; 1773 break; 1774 case '=': 1775 if (subtype == 0) 1776 break; 1777 str = vstype[subtype & VSTYPE]; 1778 if (subtype & VSNUL) 1779 c = ':'; 1780 else 1781 c = *str++; /*{*/ 1782 if (c != '}') 1783 quoted <<= 1; 1784 else if (*p == CTLENDVAR) 1785 c = *str++; 1786 subtype = 0; 1787 break; 1788 case '\'': 1789 case '\\': 1790 case '"': 1791 case '$': 1792 /* These can only happen inside quotes */ 1793 cc[0] = c; 1794 str = cc; 1795 c = '\\'; 1796 break; 1797 default: 1798 break; 1799 } 1800 if (c != '\0') do { /* c == 0 implies nothing in str */ 1801 *nextc++ = c; 1802 } while (--nleft > 0 && str && (c = *str++)); 1803 str = 0; 1804 } 1805 if ((quoted & 1) && nleft) { 1806 *nextc++ = '"'; 1807 nleft--; 1808 } 1809 cmdnleft = nleft; 1810 cmdnextc = nextc; 1811 } 1812
Indexes created Thu Oct 02 14:10:14 GMT 2025