1/* $OpenBSD: jobs.c,v 1.40 2013/09/04 15:49:18 millert Exp $ */ 2 3/*- 4 * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2011, 5 * 2012, 2013, 2014 6 * Thorsten Glaser <tg@mirbsd.org> 7 * 8 * Provided that these terms and disclaimer and all copyright notices 9 * are retained or reproduced in an accompanying document, permission 10 * is granted to deal in this work without restriction, including un- 11 * limited rights to use, publicly perform, distribute, sell, modify, 12 * merge, give away, or sublicence. 13 * 14 * This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to 15 * the utmost extent permitted by applicable law, neither express nor 16 * implied; without malicious intent or gross negligence. In no event 17 * may a licensor, author or contributor be held liable for indirect, 18 * direct, other damage, loss, or other issues arising in any way out 19 * of dealing in the work, even if advised of the possibility of such 20 * damage or existence of a defect, except proven that it results out 21 * of said person's immediate fault when using the work as intended. 22 */ 23 24#include "sh.h" 25 26__RCSID("$MirOS: src/bin/mksh/jobs.c,v 1.105 2014/10/03 12:32:48 tg Exp $"); 27 28#if HAVE_KILLPG 29#define mksh_killpg killpg 30#else 31/* cross fingers and hope kill is killpg-endowed */ 32#define mksh_killpg(p,s) kill(-(p), (s)) 33#endif 34 35/* Order important! */ 36#define PRUNNING 0 37#define PEXITED 1 38#define PSIGNALLED 2 39#define PSTOPPED 3 40 41typedef struct proc Proc; 42struct proc { 43 Proc *next; /* next process in pipeline (if any) */ 44 pid_t pid; /* process id */ 45 int state; 46 int status; /* wait status */ 47 /* process command string from vistree */ 48 char command[256 - (ALLOC_SIZE + sizeof(Proc *) + sizeof(pid_t) + 49 2 * sizeof(int))]; 50}; 51 52/* Notify/print flag - j_print() argument */ 53#define JP_SHORT 1 /* print signals processes were killed by */ 54#define JP_MEDIUM 2 /* print [job-num] -/+ command */ 55#define JP_LONG 3 /* print [job-num] -/+ pid command */ 56#define JP_PGRP 4 /* print pgrp */ 57 58/* put_job() flags */ 59#define PJ_ON_FRONT 0 /* at very front */ 60#define PJ_PAST_STOPPED 1 /* just past any stopped jobs */ 61 62/* Job.flags values */ 63#define JF_STARTED 0x001 /* set when all processes in job are started */ 64#define JF_WAITING 0x002 /* set if j_waitj() is waiting on job */ 65#define JF_W_ASYNCNOTIFY 0x004 /* set if waiting and async notification ok */ 66#define JF_XXCOM 0x008 /* set for $(command) jobs */ 67#define JF_FG 0x010 /* running in foreground (also has tty pgrp) */ 68#define JF_SAVEDTTY 0x020 /* j->ttystat is valid */ 69#define JF_CHANGED 0x040 /* process has changed state */ 70#define JF_KNOWN 0x080 /* $! referenced */ 71#define JF_ZOMBIE 0x100 /* known, unwaited process */ 72#define JF_REMOVE 0x200 /* flagged for removal (j_jobs()/j_noityf()) */ 73#define JF_USETTYMODE 0x400 /* tty mode saved if process exits normally */ 74#define JF_SAVEDTTYPGRP 0x800 /* j->saved_ttypgrp is valid */ 75 76typedef struct job Job; 77struct job { 78 Job *next; /* next job in list */ 79 Proc *proc_list; /* process list */ 80 Proc *last_proc; /* last process in list */ 81 struct timeval systime; /* system time used by job */ 82 struct timeval usrtime; /* user time used by job */ 83 pid_t pgrp; /* process group of job */ 84 pid_t ppid; /* pid of process that forked job */ 85 int job; /* job number: %n */ 86 int flags; /* see JF_* */ 87 volatile int state; /* job state */ 88 int status; /* exit status of last process */ 89 int32_t age; /* number of jobs started */ 90 Coproc_id coproc_id; /* 0 or id of coprocess output pipe */ 91#ifndef MKSH_UNEMPLOYED 92 mksh_ttyst ttystat; /* saved tty state for stopped jobs */ 93 pid_t saved_ttypgrp; /* saved tty process group for stopped jobs */ 94#endif 95}; 96 97/* Flags for j_waitj() */ 98#define JW_NONE 0x00 99#define JW_INTERRUPT 0x01 /* ^C will stop the wait */ 100#define JW_ASYNCNOTIFY 0x02 /* asynchronous notification during wait ok */ 101#define JW_STOPPEDWAIT 0x04 /* wait even if job stopped */ 102#define JW_PIPEST 0x08 /* want PIPESTATUS */ 103 104/* Error codes for j_lookup() */ 105#define JL_NOSUCH 0 /* no such job */ 106#define JL_AMBIG 1 /* %foo or %?foo is ambiguous */ 107#define JL_INVALID 2 /* non-pid, non-% job id */ 108 109static const char * const lookup_msgs[] = { 110 "no such job", 111 "ambiguous", 112 "argument must be %job or process id" 113}; 114 115static Job *job_list; /* job list */ 116static Job *last_job; 117static Job *async_job; 118static pid_t async_pid; 119 120static int nzombie; /* # of zombies owned by this process */ 121static int32_t njobs; /* # of jobs started */ 122 123#ifndef CHILD_MAX 124#define CHILD_MAX 25 125#endif 126 127#ifndef MKSH_NOPROSPECTOFWORK 128/* held_sigchld is set if sigchld occurs before a job is completely started */ 129static volatile sig_atomic_t held_sigchld; 130#endif 131 132#ifndef MKSH_UNEMPLOYED 133static struct shf *shl_j; 134static bool ttypgrp_ok; /* set if can use tty pgrps */ 135static pid_t restore_ttypgrp = -1; 136static int const tt_sigs[] = { SIGTSTP, SIGTTIN, SIGTTOU }; 137#endif 138 139static void j_set_async(Job *); 140static void j_startjob(Job *); 141static int j_waitj(Job *, int, const char *); 142static void j_sigchld(int); 143static void j_print(Job *, int, struct shf *); 144static Job *j_lookup(const char *, int *); 145static Job *new_job(void); 146static Proc *new_proc(void); 147static void check_job(Job *); 148static void put_job(Job *, int); 149static void remove_job(Job *, const char *); 150static int kill_job(Job *, int); 151 152static void tty_init_talking(void); 153static void tty_init_state(void); 154 155/* initialise job control */ 156void 157j_init(void) 158{ 159#ifndef MKSH_UNEMPLOYED 160 bool mflagset = Flag(FMONITOR) != 127; 161 162 Flag(FMONITOR) = 0; 163#endif 164 165#ifndef MKSH_NOPROSPECTOFWORK 166 (void)sigemptyset(&sm_default); 167 sigprocmask(SIG_SETMASK, &sm_default, NULL); 168 169 (void)sigemptyset(&sm_sigchld); 170 (void)sigaddset(&sm_sigchld, SIGCHLD); 171 172 setsig(&sigtraps[SIGCHLD], j_sigchld, 173 SS_RESTORE_ORIG|SS_FORCE|SS_SHTRAP); 174#else 175 /* Make sure SIGCHLD isn't ignored - can do odd things under SYSV */ 176 setsig(&sigtraps[SIGCHLD], SIG_DFL, SS_RESTORE_ORIG|SS_FORCE); 177#endif 178 179#ifndef MKSH_UNEMPLOYED 180 if (!mflagset && Flag(FTALKING)) 181 Flag(FMONITOR) = 1; 182 183 /* 184 * shl_j is used to do asynchronous notification (used in 185 * an interrupt handler, so need a distinct shf) 186 */ 187 shl_j = shf_fdopen(2, SHF_WR, NULL); 188 189 if (Flag(FMONITOR) || Flag(FTALKING)) { 190 int i; 191 192 /* 193 * the TF_SHELL_USES test is a kludge that lets us know if 194 * if the signals have been changed by the shell. 195 */ 196 for (i = NELEM(tt_sigs); --i >= 0; ) { 197 sigtraps[tt_sigs[i]].flags |= TF_SHELL_USES; 198 /* j_change() sets this to SS_RESTORE_DFL if FMONITOR */ 199 setsig(&sigtraps[tt_sigs[i]], SIG_IGN, 200 SS_RESTORE_IGN|SS_FORCE); 201 } 202 } 203 204 /* j_change() calls tty_init_talking() and tty_init_state() */ 205 if (Flag(FMONITOR)) 206 j_change(); 207 else 208#endif 209 if (Flag(FTALKING)) { 210 tty_init_talking(); 211 tty_init_state(); 212 } 213} 214 215static int 216proc_errorlevel(Proc *p) 217{ 218 switch (p->state) { 219 case PEXITED: 220 return (WEXITSTATUS(p->status)); 221 case PSIGNALLED: 222 return (128 + WTERMSIG(p->status)); 223 default: 224 return (0); 225 } 226} 227 228#if !defined(MKSH_UNEMPLOYED) && HAVE_GETSID 229/* suspend the shell */ 230void 231j_suspend(void) 232{ 233 struct sigaction sa, osa; 234 235 /* Restore tty and pgrp. */ 236 if (ttypgrp_ok) { 237 if (tty_hasstate) 238 mksh_tcset(tty_fd, &tty_state); 239 if (restore_ttypgrp >= 0) { 240 if (tcsetpgrp(tty_fd, restore_ttypgrp) < 0) { 241 warningf(false, "%s: %s %s: %s", "j_suspend", 242 "tcsetpgrp", "failed", cstrerror(errno)); 243 } else if (setpgid(0, restore_ttypgrp) < 0) { 244 warningf(false, "%s: %s %s: %s", "j_suspend", 245 "setpgid", "failed", cstrerror(errno)); 246 } 247 } 248 } 249 250 /* Suspend the shell. */ 251 memset(&sa, 0, sizeof(sa)); 252 sigemptyset(&sa.sa_mask); 253 sa.sa_handler = SIG_DFL; 254 sigaction(SIGTSTP, &sa, &osa); 255 kill(0, SIGTSTP); 256 257 /* Back from suspend, reset signals, pgrp and tty. */ 258 sigaction(SIGTSTP, &osa, NULL); 259 if (ttypgrp_ok) { 260 if (restore_ttypgrp >= 0) { 261 if (setpgid(0, kshpid) < 0) { 262 warningf(false, "%s: %s %s: %s", "j_suspend", 263 "setpgid", "failed", cstrerror(errno)); 264 ttypgrp_ok = false; 265 } else if (tcsetpgrp(tty_fd, kshpid) < 0) { 266 warningf(false, "%s: %s %s: %s", "j_suspend", 267 "tcsetpgrp", "failed", cstrerror(errno)); 268 ttypgrp_ok = false; 269 } 270 } 271 tty_init_state(); 272 } 273} 274#endif 275 276/* job cleanup before shell exit */ 277void 278j_exit(void) 279{ 280 /* kill stopped, and possibly running, jobs */ 281 Job *j; 282 bool killed = false; 283 284 for (j = job_list; j != NULL; j = j->next) { 285 if (j->ppid == procpid && 286 (j->state == PSTOPPED || 287 (j->state == PRUNNING && 288 ((j->flags & JF_FG) || 289 (Flag(FLOGIN) && !Flag(FNOHUP) && procpid == kshpid))))) { 290 killed = true; 291 if (j->pgrp == 0) 292 kill_job(j, SIGHUP); 293 else 294 mksh_killpg(j->pgrp, SIGHUP); 295#ifndef MKSH_UNEMPLOYED 296 if (j->state == PSTOPPED) { 297 if (j->pgrp == 0) 298 kill_job(j, SIGCONT); 299 else 300 mksh_killpg(j->pgrp, SIGCONT); 301 } 302#endif 303 } 304 } 305 if (killed) 306 sleep(1); 307 j_notify(); 308 309#ifndef MKSH_UNEMPLOYED 310 if (kshpid == procpid && restore_ttypgrp >= 0) { 311 /* 312 * Need to restore the tty pgrp to what it was when the 313 * shell started up, so that the process that started us 314 * will be able to access the tty when we are done. 315 * Also need to restore our process group in case we are 316 * about to do an exec so that both our parent and the 317 * process we are to become will be able to access the tty. 318 */ 319 tcsetpgrp(tty_fd, restore_ttypgrp); 320 setpgid(0, restore_ttypgrp); 321 } 322 if (Flag(FMONITOR)) { 323 Flag(FMONITOR) = 0; 324 j_change(); 325 } 326#endif 327} 328 329#ifndef MKSH_UNEMPLOYED 330/* turn job control on or off according to Flag(FMONITOR) */ 331void 332j_change(void) 333{ 334 int i; 335 336 if (Flag(FMONITOR)) { 337 bool use_tty = Flag(FTALKING); 338 339 /* don't call mksh_tcget until we own the tty process group */ 340 if (use_tty) 341 tty_init_talking(); 342 343 /* no controlling tty, no SIGT* */ 344 if ((ttypgrp_ok = (use_tty && tty_fd >= 0 && tty_devtty))) { 345 setsig(&sigtraps[SIGTTIN], SIG_DFL, 346 SS_RESTORE_ORIG|SS_FORCE); 347 /* wait to be given tty (POSIX.1, B.2, job control) */ 348 while (/* CONSTCOND */ 1) { 349 pid_t ttypgrp; 350 351 if ((ttypgrp = tcgetpgrp(tty_fd)) < 0) { 352 warningf(false, "%s: %s %s: %s", 353 "j_init", "tcgetpgrp", "failed", 354 cstrerror(errno)); 355 ttypgrp_ok = false; 356 break; 357 } 358 if (ttypgrp == kshpgrp) 359 break; 360 kill(0, SIGTTIN); 361 } 362 } 363 for (i = NELEM(tt_sigs); --i >= 0; ) 364 setsig(&sigtraps[tt_sigs[i]], SIG_IGN, 365 SS_RESTORE_DFL|SS_FORCE); 366 if (ttypgrp_ok && kshpgrp != kshpid) { 367 if (setpgid(0, kshpid) < 0) { 368 warningf(false, "%s: %s %s: %s", "j_init", 369 "setpgid", "failed", cstrerror(errno)); 370 ttypgrp_ok = false; 371 } else { 372 if (tcsetpgrp(tty_fd, kshpid) < 0) { 373 warningf(false, "%s: %s %s: %s", 374 "j_init", "tcsetpgrp", "failed", 375 cstrerror(errno)); 376 ttypgrp_ok = false; 377 } else 378 restore_ttypgrp = kshpgrp; 379 kshpgrp = kshpid; 380 } 381 } 382#ifndef MKSH_DISABLE_TTY_WARNING 383 if (use_tty && !ttypgrp_ok) 384 warningf(false, "%s: %s", "warning", 385 "won't have full job control"); 386#endif 387 } else { 388 ttypgrp_ok = false; 389 if (Flag(FTALKING)) 390 for (i = NELEM(tt_sigs); --i >= 0; ) 391 setsig(&sigtraps[tt_sigs[i]], SIG_IGN, 392 SS_RESTORE_IGN|SS_FORCE); 393 else 394 for (i = NELEM(tt_sigs); --i >= 0; ) { 395 if (sigtraps[tt_sigs[i]].flags & 396 (TF_ORIG_IGN | TF_ORIG_DFL)) 397 setsig(&sigtraps[tt_sigs[i]], 398 (sigtraps[tt_sigs[i]].flags & TF_ORIG_IGN) ? 399 SIG_IGN : SIG_DFL, 400 SS_RESTORE_ORIG|SS_FORCE); 401 } 402 } 403 tty_init_state(); 404} 405#endif 406 407#if HAVE_NICE 408/* run nice(3) and ignore the result */ 409static void 410ksh_nice(int ness) 411{ 412#if defined(__USE_FORTIFY_LEVEL) && (__USE_FORTIFY_LEVEL > 0) 413 int eno; 414 415 errno = 0; 416 /* this is gonna annoy users; complain to your distro, people! */ 417 if (nice(ness) == -1 && (eno = errno) != 0) 418 warningf(false, "%s: %s", "bgnice", cstrerror(eno)); 419#else 420 (void)nice(ness); 421#endif 422} 423#endif 424 425/* execute tree in child subprocess */ 426int 427exchild(struct op *t, int flags, 428 volatile int *xerrok, 429 /* used if XPCLOSE or XCCLOSE */ 430 int close_fd) 431{ 432 /* for pipelines */ 433 static Proc *last_proc; 434 435 int rv = 0, forksleep, jwflags = JW_NONE; 436#ifndef MKSH_NOPROSPECTOFWORK 437 sigset_t omask; 438#endif 439 Proc *p; 440 Job *j; 441 pid_t cldpid; 442 443 if (flags & XPIPEST) { 444 flags &= ~XPIPEST; 445 jwflags |= JW_PIPEST; 446 } 447 448 if (flags & XEXEC) 449 /* 450 * Clear XFORK|XPCLOSE|XCCLOSE|XCOPROC|XPIPEO|XPIPEI|XXCOM|XBGND 451 * (also done in another execute() below) 452 */ 453 return (execute(t, flags & (XEXEC | XERROK), xerrok)); 454 455#ifndef MKSH_NOPROSPECTOFWORK 456 /* no SIGCHLDs while messing with job and process lists */ 457 sigprocmask(SIG_BLOCK, &sm_sigchld, &omask); 458#endif 459 460 p = new_proc(); 461 p->next = NULL; 462 p->state = PRUNNING; 463 p->status = 0; 464 p->pid = 0; 465 466 /* link process into jobs list */ 467 if (flags & XPIPEI) { 468 /* continuing with a pipe */ 469 if (!last_job) 470 internal_errorf("%s %d", 471 "exchild: XPIPEI and no last_job - pid", 472 (int)procpid); 473 j = last_job; 474 if (last_proc) 475 last_proc->next = p; 476 last_proc = p; 477 } else { 478 /* fills in j->job */ 479 j = new_job(); 480 /* 481 * we don't consider XXCOMs foreground since they don't get 482 * tty process group and we don't save or restore tty modes. 483 */ 484 j->flags = (flags & XXCOM) ? JF_XXCOM : 485 ((flags & XBGND) ? 0 : (JF_FG|JF_USETTYMODE)); 486 timerclear(&j->usrtime); 487 timerclear(&j->systime); 488 j->state = PRUNNING; 489 j->pgrp = 0; 490 j->ppid = procpid; 491 j->age = ++njobs; 492 j->proc_list = p; 493 j->coproc_id = 0; 494 last_job = j; 495 last_proc = p; 496 put_job(j, PJ_PAST_STOPPED); 497 } 498 499 vistree(p->command, sizeof(p->command), t); 500 501 /* create child process */ 502 forksleep = 1; 503 while ((cldpid = fork()) < 0 && errno == EAGAIN && forksleep < 32) { 504 if (intrsig) 505 /* allow user to ^C out... */ 506 break; 507 sleep(forksleep); 508 forksleep <<= 1; 509 } 510 /* ensure $RANDOM changes between parent and child */ 511 rndset((unsigned long)cldpid); 512 /* fork failed? */ 513 if (cldpid < 0) { 514 kill_job(j, SIGKILL); 515 remove_job(j, "fork failed"); 516#ifndef MKSH_NOPROSPECTOFWORK 517 sigprocmask(SIG_SETMASK, &omask, NULL); 518#endif 519 errorf("can't fork - try again"); 520 } 521 p->pid = cldpid ? cldpid : (procpid = getpid()); 522 523#ifndef MKSH_UNEMPLOYED 524 /* job control set up */ 525 if (Flag(FMONITOR) && !(flags&XXCOM)) { 526 bool dotty = false; 527 528 if (j->pgrp == 0) { 529 /* First process */ 530 j->pgrp = p->pid; 531 dotty = true; 532 } 533 534 /* 535 * set pgrp in both parent and child to deal with race 536 * condition 537 */ 538 setpgid(p->pid, j->pgrp); 539 if (ttypgrp_ok && dotty && !(flags & XBGND)) 540 tcsetpgrp(tty_fd, j->pgrp); 541 } 542#endif 543 544 /* used to close pipe input fd */ 545 if (close_fd >= 0 && (((flags & XPCLOSE) && cldpid) || 546 ((flags & XCCLOSE) && !cldpid))) 547 close(close_fd); 548 if (!cldpid) { 549 /* child */ 550 551 /* Do this before restoring signal */ 552 if (flags & XCOPROC) 553 coproc_cleanup(false); 554 cleanup_parents_env(); 555#ifndef MKSH_UNEMPLOYED 556 /* 557 * If FMONITOR or FTALKING is set, these signals are ignored, 558 * if neither FMONITOR nor FTALKING are set, the signals have 559 * their inherited values. 560 */ 561 if (Flag(FMONITOR) && !(flags & XXCOM)) { 562 for (forksleep = NELEM(tt_sigs); --forksleep >= 0; ) 563 setsig(&sigtraps[tt_sigs[forksleep]], SIG_DFL, 564 SS_RESTORE_DFL|SS_FORCE); 565 } 566#endif 567#if HAVE_NICE 568 if (Flag(FBGNICE) && (flags & XBGND)) 569 ksh_nice(4); 570#endif 571 if ((flags & XBGND) 572#ifndef MKSH_UNEMPLOYED 573 && !Flag(FMONITOR) 574#endif 575 ) { 576 setsig(&sigtraps[SIGINT], SIG_IGN, 577 SS_RESTORE_IGN|SS_FORCE); 578 setsig(&sigtraps[SIGQUIT], SIG_IGN, 579 SS_RESTORE_IGN|SS_FORCE); 580 if ((!(flags & (XPIPEI | XCOPROC))) && 581 ((forksleep = open("/dev/null", 0)) > 0)) { 582 (void)ksh_dup2(forksleep, 0, true); 583 close(forksleep); 584 } 585 } 586 /* in case of $(jobs) command */ 587 remove_job(j, "child"); 588#ifndef MKSH_NOPROSPECTOFWORK 589 /* remove_job needs SIGCHLD blocked still */ 590 sigprocmask(SIG_SETMASK, &omask, NULL); 591#endif 592 nzombie = 0; 593#ifndef MKSH_UNEMPLOYED 594 ttypgrp_ok = false; 595 Flag(FMONITOR) = 0; 596#endif 597 Flag(FTALKING) = 0; 598 cleartraps(); 599 /* no return */ 600 execute(t, (flags & XERROK) | XEXEC, NULL); 601#ifndef MKSH_SMALL 602 if (t->type == TPIPE) 603 unwind(LLEAVE); 604 internal_warningf("%s: %s", "exchild", "execute() returned"); 605 fptreef(shl_out, 8, "%s: tried to execute {\n\t%T\n}\n", 606 "exchild", t); 607 shf_flush(shl_out); 608#endif 609 unwind(LLEAVE); 610 /* NOTREACHED */ 611 } 612 613 /* shell (parent) stuff */ 614 if (!(flags & XPIPEO)) { 615 /* last process in a job */ 616 j_startjob(j); 617 if (flags & XCOPROC) { 618 j->coproc_id = coproc.id; 619 /* n jobs using co-process output */ 620 coproc.njobs++; 621 /* j using co-process input */ 622 coproc.job = (void *)j; 623 } 624 if (flags & XBGND) { 625 j_set_async(j); 626 if (Flag(FTALKING)) { 627 shf_fprintf(shl_out, "[%d]", j->job); 628 for (p = j->proc_list; p; p = p->next) 629 shf_fprintf(shl_out, " %d", 630 (int)p->pid); 631 shf_putchar('\n', shl_out); 632 shf_flush(shl_out); 633 } 634 } else 635 rv = j_waitj(j, jwflags, "jw:last proc"); 636 } 637 638#ifndef MKSH_NOPROSPECTOFWORK 639 sigprocmask(SIG_SETMASK, &omask, NULL); 640#endif 641 642 return (rv); 643} 644 645/* start the last job: only used for $(command) jobs */ 646void 647startlast(void) 648{ 649#ifndef MKSH_NOPROSPECTOFWORK 650 sigset_t omask; 651 652 sigprocmask(SIG_BLOCK, &sm_sigchld, &omask); 653#endif 654 655 /* no need to report error - waitlast() will do it */ 656 if (last_job) { 657 /* ensure it isn't removed by check_job() */ 658 last_job->flags |= JF_WAITING; 659 j_startjob(last_job); 660 } 661#ifndef MKSH_NOPROSPECTOFWORK 662 sigprocmask(SIG_SETMASK, &omask, NULL); 663#endif 664} 665 666/* wait for last job: only used for $(command) jobs */ 667int 668waitlast(void) 669{ 670 int rv; 671 Job *j; 672#ifndef MKSH_NOPROSPECTOFWORK 673 sigset_t omask; 674 675 sigprocmask(SIG_BLOCK, &sm_sigchld, &omask); 676#endif 677 678 j = last_job; 679 if (!j || !(j->flags & JF_STARTED)) { 680 if (!j) 681 warningf(true, "%s: %s", "waitlast", "no last job"); 682 else 683 internal_warningf("%s: %s", "waitlast", "not started"); 684#ifndef MKSH_NOPROSPECTOFWORK 685 sigprocmask(SIG_SETMASK, &omask, NULL); 686#endif 687 /* not so arbitrary, non-zero value */ 688 return (125); 689 } 690 691 rv = j_waitj(j, JW_NONE, "waitlast"); 692 693#ifndef MKSH_NOPROSPECTOFWORK 694 sigprocmask(SIG_SETMASK, &omask, NULL); 695#endif 696 697 return (rv); 698} 699 700/* wait for child, interruptable. */ 701int 702waitfor(const char *cp, int *sigp) 703{ 704 int rv, ecode, flags = JW_INTERRUPT|JW_ASYNCNOTIFY; 705 Job *j; 706#ifndef MKSH_NOPROSPECTOFWORK 707 sigset_t omask; 708 709 sigprocmask(SIG_BLOCK, &sm_sigchld, &omask); 710#endif 711 712 *sigp = 0; 713 714 if (cp == NULL) { 715 /* 716 * wait for an unspecified job - always returns 0, so 717 * don't have to worry about exited/signaled jobs 718 */ 719 for (j = job_list; j; j = j->next) 720 /* AT&T ksh will wait for stopped jobs - we don't */ 721 if (j->ppid == procpid && j->state == PRUNNING) 722 break; 723 if (!j) { 724#ifndef MKSH_NOPROSPECTOFWORK 725 sigprocmask(SIG_SETMASK, &omask, NULL); 726#endif 727 return (-1); 728 } 729 } else if ((j = j_lookup(cp, &ecode))) { 730 /* don't report normal job completion */ 731 flags &= ~JW_ASYNCNOTIFY; 732 if (j->ppid != procpid) { 733#ifndef MKSH_NOPROSPECTOFWORK 734 sigprocmask(SIG_SETMASK, &omask, NULL); 735#endif 736 return (-1); 737 } 738 } else { 739#ifndef MKSH_NOPROSPECTOFWORK 740 sigprocmask(SIG_SETMASK, &omask, NULL); 741#endif 742 if (ecode != JL_NOSUCH) 743 bi_errorf("%s: %s", cp, lookup_msgs[ecode]); 744 return (-1); 745 } 746 747 /* AT&T ksh will wait for stopped jobs - we don't */ 748 rv = j_waitj(j, flags, "jw:waitfor"); 749 750#ifndef MKSH_NOPROSPECTOFWORK 751 sigprocmask(SIG_SETMASK, &omask, NULL); 752#endif 753 754 if (rv < 0) 755 /* we were interrupted */ 756 *sigp = 128 + -rv; 757 758 return (rv); 759} 760 761/* kill (built-in) a job */ 762int 763j_kill(const char *cp, int sig) 764{ 765 Job *j; 766 int rv = 0, ecode; 767#ifndef MKSH_NOPROSPECTOFWORK 768 sigset_t omask; 769 770 sigprocmask(SIG_BLOCK, &sm_sigchld, &omask); 771#endif 772 773 if ((j = j_lookup(cp, &ecode)) == NULL) { 774#ifndef MKSH_NOPROSPECTOFWORK 775 sigprocmask(SIG_SETMASK, &omask, NULL); 776#endif 777 bi_errorf("%s: %s", cp, lookup_msgs[ecode]); 778 return (1); 779 } 780 781 if (j->pgrp == 0) { 782 /* started when !Flag(FMONITOR) */ 783 if (kill_job(j, sig) < 0) { 784 bi_errorf("%s: %s", cp, cstrerror(errno)); 785 rv = 1; 786 } 787 } else { 788#ifndef MKSH_UNEMPLOYED 789 if (j->state == PSTOPPED && (sig == SIGTERM || sig == SIGHUP)) 790 mksh_killpg(j->pgrp, SIGCONT); 791#endif 792 if (mksh_killpg(j->pgrp, sig) < 0) { 793 bi_errorf("%s: %s", cp, cstrerror(errno)); 794 rv = 1; 795 } 796 } 797 798#ifndef MKSH_NOPROSPECTOFWORK 799 sigprocmask(SIG_SETMASK, &omask, NULL); 800#endif 801 802 return (rv); 803} 804 805#ifndef MKSH_UNEMPLOYED 806/* fg and bg built-ins: called only if Flag(FMONITOR) set */ 807int 808j_resume(const char *cp, int bg) 809{ 810 Job *j; 811 Proc *p; 812 int ecode, rv = 0; 813 bool running; 814 sigset_t omask; 815 816 sigprocmask(SIG_BLOCK, &sm_sigchld, &omask); 817 818 if ((j = j_lookup(cp, &ecode)) == NULL) { 819 sigprocmask(SIG_SETMASK, &omask, NULL); 820 bi_errorf("%s: %s", cp, lookup_msgs[ecode]); 821 return (1); 822 } 823 824 if (j->pgrp == 0) { 825 sigprocmask(SIG_SETMASK, &omask, NULL); 826 bi_errorf("job not job-controlled"); 827 return (1); 828 } 829 830 if (bg) 831 shprintf("[%d] ", j->job); 832 833 running = false; 834 for (p = j->proc_list; p != NULL; p = p->next) { 835 if (p->state == PSTOPPED) { 836 p->state = PRUNNING; 837 p->status = 0; 838 running = true; 839 } 840 shf_puts(p->command, shl_stdout); 841 if (p->next) 842 shf_puts("| ", shl_stdout); 843 } 844 shf_putc('\n', shl_stdout); 845 shf_flush(shl_stdout); 846 if (running) 847 j->state = PRUNNING; 848 849 put_job(j, PJ_PAST_STOPPED); 850 if (bg) 851 j_set_async(j); 852 else { 853 /* attach tty to job */ 854 if (j->state == PRUNNING) { 855 if (ttypgrp_ok && (j->flags & JF_SAVEDTTY)) 856 mksh_tcset(tty_fd, &j->ttystat); 857 /* See comment in j_waitj regarding saved_ttypgrp. */ 858 if (ttypgrp_ok && 859 tcsetpgrp(tty_fd, (j->flags & JF_SAVEDTTYPGRP) ? 860 j->saved_ttypgrp : j->pgrp) < 0) { 861 rv = errno; 862 if (j->flags & JF_SAVEDTTY) 863 mksh_tcset(tty_fd, &tty_state); 864 sigprocmask(SIG_SETMASK, &omask, NULL); 865 bi_errorf("%s %s(%d, %ld) %s: %s", 866 "1st", "tcsetpgrp", tty_fd, 867 (long)((j->flags & JF_SAVEDTTYPGRP) ? 868 j->saved_ttypgrp : j->pgrp), "failed", 869 cstrerror(rv)); 870 return (1); 871 } 872 } 873 j->flags |= JF_FG; 874 j->flags &= ~JF_KNOWN; 875 if (j == async_job) 876 async_job = NULL; 877 } 878 879 if (j->state == PRUNNING && mksh_killpg(j->pgrp, SIGCONT) < 0) { 880 int eno = errno; 881 882 if (!bg) { 883 j->flags &= ~JF_FG; 884 if (ttypgrp_ok && (j->flags & JF_SAVEDTTY)) 885 mksh_tcset(tty_fd, &tty_state); 886 if (ttypgrp_ok && tcsetpgrp(tty_fd, kshpgrp) < 0) 887 warningf(true, "%s %s(%d, %ld) %s: %s", 888 "fg: 2nd", "tcsetpgrp", tty_fd, 889 (long)kshpgrp, "failed", cstrerror(errno)); 890 } 891 sigprocmask(SIG_SETMASK, &omask, NULL); 892 bi_errorf("%s %s %s", "can't continue job", 893 cp, cstrerror(eno)); 894 return (1); 895 } 896 if (!bg) { 897 if (ttypgrp_ok) { 898 j->flags &= ~(JF_SAVEDTTY | JF_SAVEDTTYPGRP); 899 } 900 rv = j_waitj(j, JW_NONE, "jw:resume"); 901 } 902 sigprocmask(SIG_SETMASK, &omask, NULL); 903 return (rv); 904} 905#endif 906 907/* are there any running or stopped jobs ? */ 908int 909j_stopped_running(void) 910{ 911 Job *j; 912 int which = 0; 913 914 for (j = job_list; j != NULL; j = j->next) { 915#ifndef MKSH_UNEMPLOYED 916 if (j->ppid == procpid && j->state == PSTOPPED) 917 which |= 1; 918#endif 919 if (Flag(FLOGIN) && !Flag(FNOHUP) && procpid == kshpid && 920 j->ppid == procpid && j->state == PRUNNING) 921 which |= 2; 922 } 923 if (which) { 924 shellf("You have %s%s%s jobs\n", 925 which & 1 ? "stopped" : "", 926 which == 3 ? " and " : "", 927 which & 2 ? "running" : ""); 928 return (1); 929 } 930 931 return (0); 932} 933 934 935/* list jobs for jobs built-in */ 936int 937j_jobs(const char *cp, int slp, 938 /* 0: short, 1: long, 2: pgrp */ 939 int nflag) 940{ 941 Job *j, *tmp; 942 int how, zflag = 0; 943#ifndef MKSH_NOPROSPECTOFWORK 944 sigset_t omask; 945 946 sigprocmask(SIG_BLOCK, &sm_sigchld, &omask); 947#endif 948 949 if (nflag < 0) { 950 /* kludge: print zombies */ 951 nflag = 0; 952 zflag = 1; 953 } 954 if (cp) { 955 int ecode; 956 957 if ((j = j_lookup(cp, &ecode)) == NULL) { 958#ifndef MKSH_NOPROSPECTOFWORK 959 sigprocmask(SIG_SETMASK, &omask, NULL); 960#endif 961 bi_errorf("%s: %s", cp, lookup_msgs[ecode]); 962 return (1); 963 } 964 } else 965 j = job_list; 966 how = slp == 0 ? JP_MEDIUM : (slp == 1 ? JP_LONG : JP_PGRP); 967 for (; j; j = j->next) { 968 if ((!(j->flags & JF_ZOMBIE) || zflag) && 969 (!nflag || (j->flags & JF_CHANGED))) { 970 j_print(j, how, shl_stdout); 971 if (j->state == PEXITED || j->state == PSIGNALLED) 972 j->flags |= JF_REMOVE; 973 } 974 if (cp) 975 break; 976 } 977 /* Remove jobs after printing so there won't be multiple + or - jobs */ 978 for (j = job_list; j; j = tmp) { 979 tmp = j->next; 980 if (j->flags & JF_REMOVE) 981 remove_job(j, "jobs"); 982 } 983#ifndef MKSH_NOPROSPECTOFWORK 984 sigprocmask(SIG_SETMASK, &omask, NULL); 985#endif 986 return (0); 987} 988 989/* list jobs for top-level notification */ 990void 991j_notify(void) 992{ 993 Job *j, *tmp; 994#ifndef MKSH_NOPROSPECTOFWORK 995 sigset_t omask; 996 997 sigprocmask(SIG_BLOCK, &sm_sigchld, &omask); 998#endif 999 for (j = job_list; j; j = j->next) { 1000#ifndef MKSH_UNEMPLOYED 1001 if (Flag(FMONITOR) && (j->flags & JF_CHANGED)) 1002 j_print(j, JP_MEDIUM, shl_out); 1003#endif 1004 /* 1005 * Remove job after doing reports so there aren't 1006 * multiple +/- jobs. 1007 */ 1008 if (j->state == PEXITED || j->state == PSIGNALLED) 1009 j->flags |= JF_REMOVE; 1010 } 1011 for (j = job_list; j; j = tmp) { 1012 tmp = j->next; 1013 if (j->flags & JF_REMOVE) 1014 remove_job(j, "notify"); 1015 } 1016 shf_flush(shl_out); 1017#ifndef MKSH_NOPROSPECTOFWORK 1018 sigprocmask(SIG_SETMASK, &omask, NULL); 1019#endif 1020} 1021 1022/* Return pid of last process in last asynchronous job */ 1023pid_t 1024j_async(void) 1025{ 1026#ifndef MKSH_NOPROSPECTOFWORK 1027 sigset_t omask; 1028 1029 sigprocmask(SIG_BLOCK, &sm_sigchld, &omask); 1030#endif 1031 1032 if (async_job) 1033 async_job->flags |= JF_KNOWN; 1034 1035#ifndef MKSH_NOPROSPECTOFWORK 1036 sigprocmask(SIG_SETMASK, &omask, NULL); 1037#endif 1038 1039 return (async_pid); 1040} 1041 1042/* 1043 * Make j the last async process 1044 * 1045 * If jobs are compiled in then this routine expects sigchld to be blocked. 1046 */ 1047static void 1048j_set_async(Job *j) 1049{ 1050 Job *jl, *oldest; 1051 1052 if (async_job && (async_job->flags & (JF_KNOWN|JF_ZOMBIE)) == JF_ZOMBIE) 1053 remove_job(async_job, "async"); 1054 if (!(j->flags & JF_STARTED)) { 1055 internal_warningf("%s: %s", "j_async", "job not started"); 1056 return; 1057 } 1058 async_job = j; 1059 async_pid = j->last_proc->pid; 1060 while (nzombie > CHILD_MAX) { 1061 oldest = NULL; 1062 for (jl = job_list; jl; jl = jl->next) 1063 if (jl != async_job && (jl->flags & JF_ZOMBIE) && 1064 (!oldest || jl->age < oldest->age)) 1065 oldest = jl; 1066 if (!oldest) { 1067 /* XXX debugging */ 1068 if (!(async_job->flags & JF_ZOMBIE) || nzombie != 1) { 1069 internal_warningf("%s: bad nzombie (%d)", 1070 "j_async", nzombie); 1071 nzombie = 0; 1072 } 1073 break; 1074 } 1075 remove_job(oldest, "zombie"); 1076 } 1077} 1078 1079/* 1080 * Start a job: set STARTED, check for held signals and set j->last_proc 1081 * 1082 * If jobs are compiled in then this routine expects sigchld to be blocked. 1083 */ 1084static void 1085j_startjob(Job *j) 1086{ 1087 Proc *p; 1088 1089 j->flags |= JF_STARTED; 1090 for (p = j->proc_list; p->next; p = p->next) 1091 ; 1092 j->last_proc = p; 1093 1094#ifndef MKSH_NOPROSPECTOFWORK 1095 if (held_sigchld) { 1096 held_sigchld = 0; 1097 /* Don't call j_sigchld() as it may remove job... */ 1098 kill(procpid, SIGCHLD); 1099 } 1100#endif 1101} 1102 1103/* 1104 * wait for job to complete or change state 1105 * 1106 * If jobs are compiled in then this routine expects sigchld to be blocked. 1107 */ 1108static int 1109j_waitj(Job *j, 1110 /* see JW_* */ 1111 int flags, 1112 const char *where) 1113{ 1114 int rv; 1115#ifdef MKSH_NO_SIGSUSPEND 1116 sigset_t omask; 1117#endif 1118 1119 /* 1120 * No auto-notify on the job we are waiting on. 1121 */ 1122 j->flags |= JF_WAITING; 1123 if (flags & JW_ASYNCNOTIFY) 1124 j->flags |= JF_W_ASYNCNOTIFY; 1125 1126#ifndef MKSH_UNEMPLOYED 1127 if (!Flag(FMONITOR)) 1128#endif 1129 flags |= JW_STOPPEDWAIT; 1130 1131 while (j->state == PRUNNING || 1132 ((flags & JW_STOPPEDWAIT) && j->state == PSTOPPED)) { 1133#ifndef MKSH_NOPROSPECTOFWORK 1134#ifdef MKSH_NO_SIGSUSPEND 1135 sigprocmask(SIG_SETMASK, &sm_default, &omask); 1136 pause(); 1137 /* note that handlers may run here so they need to know */ 1138 sigprocmask(SIG_SETMASK, &omask, NULL); 1139#else 1140 sigsuspend(&sm_default); 1141#endif 1142#else 1143 j_sigchld(SIGCHLD); 1144#endif 1145 if (fatal_trap) { 1146 int oldf = j->flags & (JF_WAITING|JF_W_ASYNCNOTIFY); 1147 j->flags &= ~(JF_WAITING|JF_W_ASYNCNOTIFY); 1148 runtraps(TF_FATAL); 1149 /* not reached... */ 1150 j->flags |= oldf; 1151 } 1152 if ((flags & JW_INTERRUPT) && (rv = trap_pending())) { 1153 j->flags &= ~(JF_WAITING|JF_W_ASYNCNOTIFY); 1154 return (-rv); 1155 } 1156 } 1157 j->flags &= ~(JF_WAITING|JF_W_ASYNCNOTIFY); 1158 1159 if (j->flags & JF_FG) { 1160 j->flags &= ~JF_FG; 1161#ifndef MKSH_UNEMPLOYED 1162 if (Flag(FMONITOR) && ttypgrp_ok && j->pgrp) { 1163 /* 1164 * Save the tty's current pgrp so it can be restored 1165 * when the job is foregrounded. This is to 1166 * deal with things like the GNU su which does 1167 * a fork/exec instead of an exec (the fork means 1168 * the execed shell gets a different pid from its 1169 * pgrp, so naturally it sets its pgrp and gets hosed 1170 * when it gets foregrounded by the parent shell which 1171 * has restored the tty's pgrp to that of the su 1172 * process). 1173 */ 1174 if (j->state == PSTOPPED && 1175 (j->saved_ttypgrp = tcgetpgrp(tty_fd)) >= 0) 1176 j->flags |= JF_SAVEDTTYPGRP; 1177 if (tcsetpgrp(tty_fd, kshpgrp) < 0) 1178 warningf(true, "%s %s(%d, %ld) %s: %s", 1179 "j_waitj:", "tcsetpgrp", tty_fd, 1180 (long)kshpgrp, "failed", cstrerror(errno)); 1181 if (j->state == PSTOPPED) { 1182 j->flags |= JF_SAVEDTTY; 1183 mksh_tcget(tty_fd, &j->ttystat); 1184 } 1185 } 1186#endif 1187 if (tty_hasstate) { 1188 /* 1189 * Only restore tty settings if job was originally 1190 * started in the foreground. Problems can be 1191 * caused by things like 'more foobar &' which will 1192 * typically get and save the shell's vi/emacs tty 1193 * settings before setting up the tty for itself; 1194 * when more exits, it restores the 'original' 1195 * settings, and things go down hill from there... 1196 */ 1197 if (j->state == PEXITED && j->status == 0 && 1198 (j->flags & JF_USETTYMODE)) { 1199 mksh_tcget(tty_fd, &tty_state); 1200 } else { 1201 mksh_tcset(tty_fd, &tty_state); 1202 /*- 1203 * Don't use tty mode if job is stopped and 1204 * later restarted and exits. Consider 1205 * the sequence: 1206 * vi foo (stopped) 1207 * ... 1208 * stty something 1209 * ... 1210 * fg (vi; ZZ) 1211 * mode should be that of the stty, not what 1212 * was before the vi started. 1213 */ 1214 if (j->state == PSTOPPED) 1215 j->flags &= ~JF_USETTYMODE; 1216 } 1217 } 1218#ifndef MKSH_UNEMPLOYED 1219 /* 1220 * If it looks like user hit ^C to kill a job, pretend we got 1221 * one too to break out of for loops, etc. (AT&T ksh does this 1222 * even when not monitoring, but this doesn't make sense since 1223 * a tty generated ^C goes to the whole process group) 1224 */ 1225 { 1226 int status; 1227 1228 status = j->last_proc->status; 1229 if (Flag(FMONITOR) && j->state == PSIGNALLED && 1230 WIFSIGNALED(status) && 1231 (sigtraps[WTERMSIG(status)].flags & TF_TTY_INTR)) 1232 trapsig(WTERMSIG(status)); 1233 } 1234#endif 1235 } 1236 1237 j_usrtime = j->usrtime; 1238 j_systime = j->systime; 1239 rv = j->status; 1240 1241 if ((flags & JW_PIPEST) && (j->proc_list != NULL)) { 1242 uint32_t num = 0; 1243 Proc *p = j->proc_list; 1244 struct tbl *vp; 1245 1246 unset(vp_pipest, 1); 1247 vp = vp_pipest; 1248 vp->flag = DEFINED | ISSET | INTEGER | RDONLY | ARRAY | INT_U; 1249 goto got_array; 1250 1251 while (p != NULL) { 1252 { 1253 struct tbl *vq; 1254 1255 /* strlen(vp_pipest->name) == 10 */ 1256 vq = alloc(offsetof(struct tbl, name[0]) + 11, 1257 vp_pipest->areap); 1258 memset(vq, 0, offsetof(struct tbl, name[0])); 1259 memcpy(vq->name, vp_pipest->name, 11); 1260 vp->u.array = vq; 1261 vp = vq; 1262 } 1263 vp->areap = vp_pipest->areap; 1264 vp->ua.index = ++num; 1265 vp->flag = DEFINED | ISSET | INTEGER | RDONLY | 1266 ARRAY | INT_U | AINDEX; 1267 got_array: 1268 vp->val.i = proc_errorlevel(p); 1269 if (Flag(FPIPEFAIL) && vp->val.i) 1270 rv = vp->val.i; 1271 p = p->next; 1272 } 1273 } else if (Flag(FPIPEFAIL) && (j->proc_list != NULL)) { 1274 Proc *p = j->proc_list; 1275 int i; 1276 1277 while (p != NULL) { 1278 if ((i = proc_errorlevel(p))) 1279 rv = i; 1280 p = p->next; 1281 } 1282 } 1283 1284 if (!(flags & JW_ASYNCNOTIFY) 1285#ifndef MKSH_UNEMPLOYED 1286 && (!Flag(FMONITOR) || j->state != PSTOPPED) 1287#endif 1288 ) { 1289 j_print(j, JP_SHORT, shl_out); 1290 shf_flush(shl_out); 1291 } 1292 if (j->state != PSTOPPED 1293#ifndef MKSH_UNEMPLOYED 1294 && (!Flag(FMONITOR) || !(flags & JW_ASYNCNOTIFY)) 1295#endif 1296 ) 1297 remove_job(j, where); 1298 1299 return (rv); 1300} 1301 1302/* 1303 * SIGCHLD handler to reap children and update job states 1304 * 1305 * If jobs are compiled in then this routine expects sigchld to be blocked. 1306 */ 1307/* ARGSUSED */ 1308static void 1309j_sigchld(int sig MKSH_A_UNUSED) 1310{ 1311 int saved_errno = errno; 1312 Job *j; 1313 Proc *p = NULL; 1314 pid_t pid; 1315 int status; 1316 struct rusage ru0, ru1; 1317#ifdef MKSH_NO_SIGSUSPEND 1318 sigset_t omask; 1319 1320 /* this handler can run while SIGCHLD is not blocked, so block it now */ 1321 sigprocmask(SIG_BLOCK, &sm_sigchld, &omask); 1322#endif 1323 1324#ifndef MKSH_NOPROSPECTOFWORK 1325 /* 1326 * Don't wait for any processes if a job is partially started. 1327 * This is so we don't do away with the process group leader 1328 * before all the processes in a pipe line are started (so the 1329 * setpgid() won't fail) 1330 */ 1331 for (j = job_list; j; j = j->next) 1332 if (j->ppid == procpid && !(j->flags & JF_STARTED)) { 1333 held_sigchld = 1; 1334 goto j_sigchld_out; 1335 } 1336#endif 1337 1338 getrusage(RUSAGE_CHILDREN, &ru0); 1339 do { 1340#ifndef MKSH_NOPROSPECTOFWORK 1341 pid = waitpid(-1, &status, (WNOHANG | 1342#if defined(WCONTINUED) && defined(WIFCONTINUED) 1343 WCONTINUED | 1344#endif 1345 WUNTRACED)); 1346#else 1347 pid = wait(&status); 1348#endif 1349 1350 /* 1351 * return if this would block (0) or no children 1352 * or interrupted (-1) 1353 */ 1354 if (pid <= 0) 1355 goto j_sigchld_out; 1356 1357 getrusage(RUSAGE_CHILDREN, &ru1); 1358 1359 /* find job and process structures for this pid */ 1360 for (j = job_list; j != NULL; j = j->next) 1361 for (p = j->proc_list; p != NULL; p = p->next) 1362 if (p->pid == pid) 1363 goto found; 1364 found: 1365 if (j == NULL) { 1366 /* Can occur if process has kids, then execs shell 1367 warningf(true, "bad process waited for (pid = %d)", 1368 pid); 1369 */ 1370 ru0 = ru1; 1371 continue; 1372 } 1373 1374 timeradd(&j->usrtime, &ru1.ru_utime, &j->usrtime); 1375 timersub(&j->usrtime, &ru0.ru_utime, &j->usrtime); 1376 timeradd(&j->systime, &ru1.ru_stime, &j->systime); 1377 timersub(&j->systime, &ru0.ru_stime, &j->systime); 1378 ru0 = ru1; 1379 p->status = status; 1380#ifndef MKSH_UNEMPLOYED 1381 if (WIFSTOPPED(status)) 1382 p->state = PSTOPPED; 1383 else 1384#if defined(WCONTINUED) && defined(WIFCONTINUED) 1385 if (WIFCONTINUED(status)) { 1386 p->state = j->state = PRUNNING; 1387 /* skip check_job(), no-op in this case */ 1388 continue; 1389 } else 1390#endif 1391#endif 1392 if (WIFSIGNALED(status)) 1393 p->state = PSIGNALLED; 1394 else 1395 p->state = PEXITED; 1396 1397 /* check to see if entire job is done */ 1398 check_job(j); 1399 } 1400#ifndef MKSH_NOPROSPECTOFWORK 1401 while (/* CONSTCOND */ 1); 1402#else 1403 while (/* CONSTCOND */ 0); 1404#endif 1405 1406 j_sigchld_out: 1407#ifdef MKSH_NO_SIGSUSPEND 1408 sigprocmask(SIG_SETMASK, &omask, NULL); 1409#endif 1410 errno = saved_errno; 1411} 1412 1413/* 1414 * Called only when a process in j has exited/stopped (ie, called only 1415 * from j_sigchld()). If no processes are running, the job status 1416 * and state are updated, asynchronous job notification is done and, 1417 * if unneeded, the job is removed. 1418 * 1419 * If jobs are compiled in then this routine expects sigchld to be blocked. 1420 */ 1421static void 1422check_job(Job *j) 1423{ 1424 int jstate; 1425 Proc *p; 1426 1427 /* XXX debugging (nasty - interrupt routine using shl_out) */ 1428 if (!(j->flags & JF_STARTED)) { 1429 internal_warningf("check_job: job started (flags 0x%x)", 1430 j->flags); 1431 return; 1432 } 1433 1434 jstate = PRUNNING; 1435 for (p=j->proc_list; p != NULL; p = p->next) { 1436 if (p->state == PRUNNING) 1437 /* some processes still running */ 1438 return; 1439 if (p->state > jstate) 1440 jstate = p->state; 1441 } 1442 j->state = jstate; 1443 j->status = proc_errorlevel(j->last_proc); 1444 1445 /* 1446 * Note when co-process dies: can't be done in j_wait() nor 1447 * remove_job() since neither may be called for non-interactive 1448 * shells. 1449 */ 1450 if (j->state == PEXITED || j->state == PSIGNALLED) { 1451 /* 1452 * No need to keep co-process input any more 1453 * (at least, this is what ksh93d thinks) 1454 */ 1455 if (coproc.job == j) { 1456 coproc.job = NULL; 1457 /* 1458 * XXX would be nice to get the closes out of here 1459 * so they aren't done in the signal handler. 1460 * Would mean a check in coproc_getfd() to 1461 * do "if job == 0 && write >= 0, close write". 1462 */ 1463 coproc_write_close(coproc.write); 1464 } 1465 /* Do we need to keep the output? */ 1466 if (j->coproc_id && j->coproc_id == coproc.id && 1467 --coproc.njobs == 0) 1468 coproc_readw_close(coproc.read); 1469 } 1470 1471 j->flags |= JF_CHANGED; 1472#ifndef MKSH_UNEMPLOYED 1473 if (Flag(FMONITOR) && !(j->flags & JF_XXCOM)) { 1474 /* 1475 * Only put stopped jobs at the front to avoid confusing 1476 * the user (don't want finished jobs effecting %+ or %-) 1477 */ 1478 if (j->state == PSTOPPED) 1479 put_job(j, PJ_ON_FRONT); 1480 if (Flag(FNOTIFY) && 1481 (j->flags & (JF_WAITING|JF_W_ASYNCNOTIFY)) != JF_WAITING) { 1482 /* Look for the real file descriptor 2 */ 1483 { 1484 struct env *ep; 1485 int fd = 2; 1486 1487 for (ep = e; ep; ep = ep->oenv) 1488 if (ep->savefd && ep->savefd[2]) 1489 fd = ep->savefd[2]; 1490 shf_reopen(fd, SHF_WR, shl_j); 1491 } 1492 /* 1493 * Can't call j_notify() as it removes jobs. The job 1494 * must stay in the job list as j_waitj() may be 1495 * running with this job. 1496 */ 1497 j_print(j, JP_MEDIUM, shl_j); 1498 shf_flush(shl_j); 1499 if (!(j->flags & JF_WAITING) && j->state != PSTOPPED) 1500 remove_job(j, "notify"); 1501 } 1502 } 1503#endif 1504 if ( 1505#ifndef MKSH_UNEMPLOYED 1506 !Flag(FMONITOR) && 1507#endif 1508 !(j->flags & (JF_WAITING|JF_FG)) && 1509 j->state != PSTOPPED) { 1510 if (j == async_job || (j->flags & JF_KNOWN)) { 1511 j->flags |= JF_ZOMBIE; 1512 j->job = -1; 1513 nzombie++; 1514 } else 1515 remove_job(j, "checkjob"); 1516 } 1517} 1518 1519/* 1520 * Print job status in either short, medium or long format. 1521 * 1522 * If jobs are compiled in then this routine expects sigchld to be blocked. 1523 */ 1524static void 1525j_print(Job *j, int how, struct shf *shf) 1526{ 1527 Proc *p; 1528 int state; 1529 int status; 1530 int coredumped; 1531 char jobchar = ' '; 1532 char buf[64]; 1533 const char *filler; 1534 int output = 0; 1535 1536 if (how == JP_PGRP) { 1537 /* 1538 * POSIX doesn't say what to do it there is no process 1539 * group leader (ie, !FMONITOR). We arbitrarily return 1540 * last pid (which is what $! returns). 1541 */ 1542 shf_fprintf(shf, "%d\n", (int)(j->pgrp ? j->pgrp : 1543 (j->last_proc ? j->last_proc->pid : 0))); 1544 return; 1545 } 1546 j->flags &= ~JF_CHANGED; 1547 filler = j->job > 10 ? "\n " : "\n "; 1548 if (j == job_list) 1549 jobchar = '+'; 1550 else if (j == job_list->next) 1551 jobchar = '-'; 1552 1553 for (p = j->proc_list; p != NULL;) { 1554 coredumped = 0; 1555 switch (p->state) { 1556 case PRUNNING: 1557 memcpy(buf, "Running", 8); 1558 break; 1559 case PSTOPPED: 1560 strlcpy(buf, sigtraps[WSTOPSIG(p->status)].mess, 1561 sizeof(buf)); 1562 break; 1563 case PEXITED: 1564 if (how == JP_SHORT) 1565 buf[0] = '\0'; 1566 else if (WEXITSTATUS(p->status) == 0) 1567 memcpy(buf, "Done", 5); 1568 else 1569 shf_snprintf(buf, sizeof(buf), "Done (%d)", 1570 WEXITSTATUS(p->status)); 1571 break; 1572 case PSIGNALLED: 1573#ifdef WCOREDUMP 1574 if (WCOREDUMP(p->status)) 1575 coredumped = 1; 1576#endif 1577 /* 1578 * kludge for not reporting 'normal termination 1579 * signals' (i.e. SIGINT, SIGPIPE) 1580 */ 1581 if (how == JP_SHORT && !coredumped && 1582 (WTERMSIG(p->status) == SIGINT || 1583 WTERMSIG(p->status) == SIGPIPE)) { 1584 buf[0] = '\0'; 1585 } else 1586 strlcpy(buf, sigtraps[WTERMSIG(p->status)].mess, 1587 sizeof(buf)); 1588 break; 1589 default: 1590 buf[0] = '\0'; 1591 } 1592 1593 if (how != JP_SHORT) { 1594 if (p == j->proc_list) 1595 shf_fprintf(shf, "[%d] %c ", j->job, jobchar); 1596 else 1597 shf_puts(filler, shf); 1598 } 1599 1600 if (how == JP_LONG) 1601 shf_fprintf(shf, "%5d ", (int)p->pid); 1602 1603 if (how == JP_SHORT) { 1604 if (buf[0]) { 1605 output = 1; 1606 shf_fprintf(shf, "%s%s ", 1607 buf, coredumped ? " (core dumped)" : null); 1608 } 1609 } else { 1610 output = 1; 1611 shf_fprintf(shf, "%-20s %s%s%s", buf, p->command, 1612 p->next ? "|" : null, 1613 coredumped ? " (core dumped)" : null); 1614 } 1615 1616 state = p->state; 1617 status = p->status; 1618 p = p->next; 1619 while (p && p->state == state && p->status == status) { 1620 if (how == JP_LONG) 1621 shf_fprintf(shf, "%s%5d %-20s %s%s", filler, 1622 (int)p->pid, " ", p->command, 1623 p->next ? "|" : null); 1624 else if (how == JP_MEDIUM) 1625 shf_fprintf(shf, " %s%s", p->command, 1626 p->next ? "|" : null); 1627 p = p->next; 1628 } 1629 } 1630 if (output) 1631 shf_putc('\n', shf); 1632} 1633 1634/* 1635 * Convert % sequence to job 1636 * 1637 * If jobs are compiled in then this routine expects sigchld to be blocked. 1638 */ 1639static Job * 1640j_lookup(const char *cp, int *ecodep) 1641{ 1642 Job *j, *last_match; 1643 Proc *p; 1644 size_t len; 1645 int job = 0; 1646 1647 if (ksh_isdigit(*cp)) { 1648 getn(cp, &job); 1649 /* Look for last_proc->pid (what $! returns) first... */ 1650 for (j = job_list; j != NULL; j = j->next) 1651 if (j->last_proc && j->last_proc->pid == job) 1652 return (j); 1653 /* 1654 * ...then look for process group (this is non-POSIX, 1655 * but should not break anything 1656 */ 1657 for (j = job_list; j != NULL; j = j->next) 1658 if (j->pgrp && j->pgrp == job) 1659 return (j); 1660 if (ecodep) 1661 *ecodep = JL_NOSUCH; 1662 return (NULL); 1663 } 1664 if (*cp != '%') { 1665 if (ecodep) 1666 *ecodep = JL_INVALID; 1667 return (NULL); 1668 } 1669 switch (*++cp) { 1670 case '\0': /* non-standard */ 1671 case '+': 1672 case '%': 1673 if (job_list != NULL) 1674 return (job_list); 1675 break; 1676 1677 case '-': 1678 if (job_list != NULL && job_list->next) 1679 return (job_list->next); 1680 break; 1681 1682 case '0': case '1': case '2': case '3': case '4': 1683 case '5': case '6': case '7': case '8': case '9': 1684 getn(cp, &job); 1685 for (j = job_list; j != NULL; j = j->next) 1686 if (j->job == job) 1687 return (j); 1688 break; 1689 1690 /* %?string */ 1691 case '?': 1692 last_match = NULL; 1693 for (j = job_list; j != NULL; j = j->next) 1694 for (p = j->proc_list; p != NULL; p = p->next) 1695 if (strstr(p->command, cp+1) != NULL) { 1696 if (last_match) { 1697 if (ecodep) 1698 *ecodep = JL_AMBIG; 1699 return (NULL); 1700 } 1701 last_match = j; 1702 } 1703 if (last_match) 1704 return (last_match); 1705 break; 1706 1707 /* %string */ 1708 default: 1709 len = strlen(cp); 1710 last_match = NULL; 1711 for (j = job_list; j != NULL; j = j->next) 1712 if (strncmp(cp, j->proc_list->command, len) == 0) { 1713 if (last_match) { 1714 if (ecodep) 1715 *ecodep = JL_AMBIG; 1716 return (NULL); 1717 } 1718 last_match = j; 1719 } 1720 if (last_match) 1721 return (last_match); 1722 break; 1723 } 1724 if (ecodep) 1725 *ecodep = JL_NOSUCH; 1726 return (NULL); 1727} 1728 1729static Job *free_jobs; 1730static Proc *free_procs; 1731 1732/* 1733 * allocate a new job and fill in the job number. 1734 * 1735 * If jobs are compiled in then this routine expects sigchld to be blocked. 1736 */ 1737static Job * 1738new_job(void) 1739{ 1740 int i; 1741 Job *newj, *j; 1742 1743 if (free_jobs != NULL) { 1744 newj = free_jobs; 1745 free_jobs = free_jobs->next; 1746 } else 1747 newj = alloc(sizeof(Job), APERM); 1748 1749 /* brute force method */ 1750 for (i = 1; ; i++) { 1751 for (j = job_list; j && j->job != i; j = j->next) 1752 ; 1753 if (j == NULL) 1754 break; 1755 } 1756 newj->job = i; 1757 1758 return (newj); 1759} 1760 1761/* 1762 * Allocate new process struct 1763 * 1764 * If jobs are compiled in then this routine expects sigchld to be blocked. 1765 */ 1766static Proc * 1767new_proc(void) 1768{ 1769 Proc *p; 1770 1771 if (free_procs != NULL) { 1772 p = free_procs; 1773 free_procs = free_procs->next; 1774 } else 1775 p = alloc(sizeof(Proc), APERM); 1776 1777 return (p); 1778} 1779 1780/* 1781 * Take job out of job_list and put old structures into free list. 1782 * Keeps nzombies, last_job and async_job up to date. 1783 * 1784 * If jobs are compiled in then this routine expects sigchld to be blocked. 1785 */ 1786static void 1787remove_job(Job *j, const char *where) 1788{ 1789 Proc *p, *tmp; 1790 Job **prev, *curr; 1791 1792 mkssert(j != NULL); 1793 prev = &job_list; 1794 curr = job_list; 1795 while (curr && curr != j) { 1796 prev = &curr->next; 1797 curr = *prev; 1798 } 1799 if (curr != j) { 1800 internal_warningf("remove_job: job %s (%s)", "not found", where); 1801 return; 1802 } 1803 *prev = curr->next; 1804 1805 /* free up proc structures */ 1806 for (p = j->proc_list; p != NULL; ) { 1807 tmp = p; 1808 p = p->next; 1809 tmp->next = free_procs; 1810 free_procs = tmp; 1811 } 1812 1813 if ((j->flags & JF_ZOMBIE) && j->ppid == procpid) 1814 --nzombie; 1815 j->next = free_jobs; 1816 free_jobs = j; 1817 1818 if (j == last_job) 1819 last_job = NULL; 1820 if (j == async_job) 1821 async_job = NULL; 1822} 1823 1824/* 1825 * put j in a particular location (taking it out job_list if it is there 1826 * already) 1827 * 1828 * If jobs are compiled in then this routine expects sigchld to be blocked. 1829 */ 1830static void 1831put_job(Job *j, int where) 1832{ 1833 Job **prev, *curr; 1834 1835 mkssert(j != NULL); 1836 /* Remove job from list (if there) */ 1837 prev = &job_list; 1838 curr = job_list; 1839 while (curr && curr != j) { 1840 prev = &curr->next; 1841 curr = *prev; 1842 } 1843 if (curr == j) 1844 *prev = curr->next; 1845 1846 switch (where) { 1847 case PJ_ON_FRONT: 1848 j->next = job_list; 1849 job_list = j; 1850 break; 1851 1852 case PJ_PAST_STOPPED: 1853 prev = &job_list; 1854 curr = job_list; 1855 for (; curr && curr->state == PSTOPPED; prev = &curr->next, 1856 curr = *prev) 1857 ; 1858 j->next = curr; 1859 *prev = j; 1860 break; 1861 } 1862} 1863 1864/* 1865 * nuke a job (called when unable to start full job). 1866 * 1867 * If jobs are compiled in then this routine expects sigchld to be blocked. 1868 */ 1869static int 1870kill_job(Job *j, int sig) 1871{ 1872 Proc *p; 1873 int rval = 0; 1874 1875 for (p = j->proc_list; p != NULL; p = p->next) 1876 if (p->pid != 0) 1877 if (kill(p->pid, sig) < 0) 1878 rval = -1; 1879 return (rval); 1880} 1881 1882static void 1883tty_init_talking(void) 1884{ 1885 switch (tty_init_fd()) { 1886 case 0: 1887 break; 1888 case 1: 1889#ifndef MKSH_DISABLE_TTY_WARNING 1890 warningf(false, "%s: %s %s: %s", 1891 "No controlling tty", "open", "/dev/tty", 1892 cstrerror(errno)); 1893#endif 1894 break; 1895 case 2: 1896#ifndef MKSH_DISABLE_TTY_WARNING 1897 warningf(false, "%s: %s", "can't find tty fd", cstrerror(errno)); 1898#endif 1899 break; 1900 case 3: 1901 warningf(false, "%s: %s %s: %s", "j_ttyinit", 1902 "dup of tty fd", "failed", cstrerror(errno)); 1903 break; 1904 case 4: 1905 warningf(false, "%s: %s: %s", "j_ttyinit", 1906 "can't set close-on-exec flag", cstrerror(errno)); 1907 break; 1908 } 1909} 1910 1911static void 1912tty_init_state(void) 1913{ 1914 if (tty_fd >= 0) { 1915 mksh_tcget(tty_fd, &tty_state); 1916 tty_hasstate = true; 1917 } 1918} 1919