sh.proc.c revision 59243
1/* $Header: /src/pub/tcsh/sh.proc.c,v 3.70 1998/10/25 15:10:22 christos Exp $ */ 2/* 3 * sh.proc.c: Job manipulations 4 */ 5/*- 6 * Copyright (c) 1980, 1991 The Regents of the University of California. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37#include "sh.h" 38 39RCSID("$Id: sh.proc.c,v 3.70 1998/10/25 15:10:22 christos Exp $") 40 41#include "ed.h" 42#include "tc.h" 43#include "tc.wait.h" 44 45#ifdef WINNT 46#undef POSIX 47#define POSIX 48#endif /* WINNT */ 49#ifdef aiws 50# undef HZ 51# define HZ 16 52#endif /* aiws */ 53 54#if defined(_BSD) || (defined(IRIS4D) && __STDC__) || defined(__lucid) || defined(linux) 55# define BSDWAIT 56#endif /* _BSD || (IRIS4D && __STDC__) || __lucid || linux */ 57#ifndef WTERMSIG 58# define WTERMSIG(w) (((union wait *) &(w))->w_termsig) 59# ifndef BSDWAIT 60# define BSDWAIT 61# endif /* !BSDWAIT */ 62#endif /* !WTERMSIG */ 63#ifndef WEXITSTATUS 64# define WEXITSTATUS(w) (((union wait *) &(w))->w_retcode) 65#endif /* !WEXITSTATUS */ 66#ifndef WSTOPSIG 67# define WSTOPSIG(w) (((union wait *) &(w))->w_stopsig) 68#endif /* !WSTOPSIG */ 69 70#ifdef __osf__ 71# ifndef WCOREDUMP 72# define WCOREDUMP(x) (_W_INT(x) & WCOREFLAG) 73# endif 74#endif 75 76#ifndef WCOREDUMP 77# ifdef BSDWAIT 78# define WCOREDUMP(w) (((union wait *) &(w))->w_coredump) 79# else /* !BSDWAIT */ 80# define WCOREDUMP(w) ((w) & 0200) 81# endif /* !BSDWAIT */ 82#endif /* !WCOREDUMP */ 83 84/* 85 * C Shell - functions that manage processes, handling hanging, termination 86 */ 87 88#define BIGINDEX 9 /* largest desirable job index */ 89 90#ifdef BSDTIMES 91# ifdef convex 92/* use 'cvxrusage' to get parallel statistics */ 93static struct cvxrusage zru = {{0L, 0L}, {0L, 0L}, 0L, 0L, 0L, 0L, 94 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 95 {0L, 0L}, 0LL, 0LL, 0LL, 0LL, 0L, 0L, 0L, 96 0LL, 0LL, {0L, 0L, 0L, 0L, 0L}}; 97# else 98# if defined(SUNOS4) || defined(hp9000) || (defined(__alpha) && defined(__osf__)) 99static struct rusage zru = {{0L, 0L}, {0L, 0L}, 0L, 0L, 0L, 0L, 100 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L}; 101 102# else /* !SUNOS4 && !hp9000 && !(__alpha && __osf__) */ 103# ifdef masscomp 104/* 105 * Initialization of this structure under RTU 4.1A & RTU 5.0 is problematic 106 * because the first two elements are unions of a time_t and a struct timeval. 107 * So we'll just have to trust the loader to do the "right thing", DAS DEC-90. 108 */ 109static struct rusage zru; 110# else /* masscomp */ 111static struct rusage zru = {{0L, 0L}, {0L, 0L}, 0, 0, 0, 0, 0, 0, 0, 112 0, 0, 0, 0, 0, 0}; 113# endif /* masscomp */ 114# endif /* SUNOS4 || hp9000 || (__alpha && __osf__) */ 115# endif /* convex */ 116#else /* !BSDTIMES */ 117# ifdef _SEQUENT_ 118static struct process_stats zru = {{0L, 0L}, {0L, 0L}, 0, 0, 0, 0, 0, 0, 0, 119 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; 120# else /* !_SEQUENT_ */ 121# ifdef _SX 122static struct tms zru = {0, 0, 0, 0}, lru = {0, 0, 0, 0}; 123# else /* !_SX */ 124static struct tms zru = {0L, 0L, 0L, 0L}, lru = {0L, 0L, 0L, 0L}; 125# endif /* !_SX */ 126# endif /* !_SEQUENT_ */ 127#endif /* !BSDTIMES */ 128 129#ifndef RUSAGE_CHILDREN 130# define RUSAGE_CHILDREN -1 131#endif /* RUSAGE_CHILDREN */ 132 133static void pflushall __P((void)); 134static void pflush __P((struct process *)); 135static void pfree __P((struct process *)); 136static void pclrcurr __P((struct process *)); 137static void padd __P((struct command *)); 138static int pprint __P((struct process *, int)); 139static void ptprint __P((struct process *)); 140static void pads __P((Char *)); 141static void pkill __P((Char **, int)); 142static struct process *pgetcurr __P((struct process *)); 143static void okpcntl __P((void)); 144static void setttypgrp __P((int)); 145 146/* 147 * pchild - called at interrupt level by the SIGCHLD signal 148 * indicating that at least one child has terminated or stopped 149 * thus at least one wait system call will definitely return a 150 * childs status. Top level routines (like pwait) must be sure 151 * to mask interrupts when playing with the proclist data structures! 152 */ 153sigret_t 154/*ARGSUSED*/ 155pchild(snum) 156int snum; 157{ 158 register struct process *pp; 159 register struct process *fp; 160 register int pid; 161#if defined(BSDJOBS) || (!defined(BSDTIMES) && (defined(ODT) || defined(aiws) || defined(uts))) 162 extern int insource; 163#endif /* BSDJOBS || (!BSDTIMES && (ODT || aiws || uts)) */ 164#ifdef BSDWAIT 165 union wait w; 166#else /* !BSDWAIT */ 167 int w; 168#endif /* !BSDWAIT */ 169 int jobflags; 170#ifdef BSDTIMES 171 struct sysrusage ru; 172#else /* !BSDTIMES */ 173# ifdef _SEQUENT_ 174 struct process_stats ru; 175 struct process_stats cpst1, cpst2; 176 timeval_t tv; 177# else /* !_SEQUENT_ */ 178 struct tms proctimes; 179 180 USE(snum); 181 if (!timesdone) { 182 timesdone++; 183 (void) times(&shtimes); 184 } 185# endif /* !_SEQUENT_ */ 186#endif /* !BSDTIMES */ 187 188#ifdef JOBDEBUG 189 xprintf("pchild()\n"); 190#endif /* JOBDEBUG */ 191 192/* Christos on where the signal(SIGCHLD, pchild) shoud be: 193 * 194 * I think that it should go *after* the wait, unlike most signal handlers. 195 * 196 * In release two (for which I have manuals), it says that wait will remove 197 * the first child from the queue of dead children. 198 * All the rest of the children that die while in the signal handler of the 199 * SIGC(H)LD, will be placed in the queue. If signal is called to re-establish 200 * the signal handler, and there are items in the queue, the process will 201 * receive another SIGC(H)LD before signal returns. BTW this is from the 202 * manual page on comp-sim... Maybe it is not applicable to the hp's, but 203 * I read on the news in comp.unix.wizards or comp.unix.questions yesterday 204 * that another person was claiming the the signal() call should be after 205 * the wait(). 206 */ 207 208loop: 209 errno = 0; /* reset, just in case */ 210#ifdef JOBDEBUG 211 xprintf("Waiting...\n"); 212 flush(); 213#endif /* JOBDEBUG */ 214#ifndef WINNT 215# ifdef BSDJOBS 216# ifdef BSDTIMES 217# ifdef convex 218 /* use 'cvxwait' to get parallel statistics */ 219 pid = cvxwait(&w, 220 (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), &ru); 221# else 222 /* both a wait3 and rusage */ 223# if !defined(BSDWAIT) || defined(NeXT) || defined(MACH) || defined(linux) || (defined(IRIS4D) && (__STDC__ || defined(FUNCPROTO)) && SYSVREL <= 3) || defined(__lucid) || defined(__osf__) 224 pid = wait3(&w, 225 (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), &ru); 226# else /* BSDWAIT */ 227 pid = wait3(&w.w_status, 228 (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), &ru); 229# endif /* BSDWAIT */ 230# endif /* convex */ 231# else /* !BSDTIMES */ 232# ifdef _SEQUENT_ 233 (void) get_process_stats(&tv, PS_SELF, 0, &cpst1); 234 pid = waitpid(-1, &w, 235 (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG)); 236 (void) get_process_stats(&tv, PS_SELF, 0, &cpst2); 237 pr_stat_sub(&cpst2, &cpst1, &ru); 238# else /* !_SEQUENT_ */ 239# ifndef POSIX 240 /* we have a wait3, but no rusage stuff */ 241 pid = wait3(&w.w_status, 242 (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), 0); 243# else /* POSIX */ 244 pid = waitpid(-1, &w, 245 (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG)); 246# endif /* POSIX */ 247# endif /* !_SEQUENT_ */ 248# endif /* !BSDTIMES */ 249# else /* !BSDJOBS */ 250# ifdef BSDTIMES 251# define HAVEwait3 252 /* both a wait3 and rusage */ 253# ifdef hpux 254 pid = wait3(&w.w_status, WNOHANG, 0); 255# else /* !hpux */ 256 pid = wait3(&w.w_status, WNOHANG, &ru); 257# endif /* !hpux */ 258# else /* !BSDTIMES */ 259# ifdef ODT /* For Sco Unix 3.2.0 or ODT 1.0 */ 260# define HAVEwait3 261 pid = waitpid(-1, &w, 262 (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG)); 263# endif /* ODT */ 264# if defined(aiws) || defined(uts) 265# define HAVEwait3 266 pid = wait3(&w.w_status, 267 (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), 0); 268# endif /* aiws || uts */ 269# ifndef HAVEwait3 270# ifdef UNRELSIGS 271 /* no wait3, therefore no rusage */ 272 /* on Sys V, this may hang. I hope it's not going to be a problem */ 273# ifdef _MINIX 274 pid = wait(&w); 275# else /* !_MINIX */ 276 pid = ourwait(&w.w_status); 277# endif /* _MINIX */ 278# else /* !UNRELSIGS */ 279 /* 280 * XXX: for greater than 3 we should use waitpid(). 281 * but then again, SVR4 falls into the POSIX/BSDJOBS category. 282 */ 283 pid = wait(&w.w_status); 284# endif /* !UNRELSIGS */ 285# endif /* !HAVEwait3 */ 286# endif /* !BSDTIMES */ 287# ifndef BSDSIGS 288 (void) sigset(SIGCHLD, pchild); 289# endif /* !BSDSIGS */ 290# endif /* !BSDJOBS */ 291#else /* WINNT */ 292 { 293 extern int insource; 294 pid = waitpid(-1, &w, 295 (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG)); 296 } 297#endif /* WINNT */ 298 299#ifdef JOBDEBUG 300 xprintf("parent %d pid %d, retval %x termsig %x retcode %x\n", 301 getpid(), pid, w, WTERMSIG(w), WEXITSTATUS(w)); 302 flush(); 303#endif /* JOBDEBUG */ 304 305 if ((pid == 0) || (pid == -1)) { 306#ifdef JOBDEBUG 307 xprintf("errno == %d\n", errno); 308#endif /* JOBDEBUG */ 309 if (errno == EINTR) { 310 errno = 0; 311 goto loop; 312 } 313 pnoprocesses = pid == -1; 314#ifndef SIGVOID 315 return (0); 316#else /* !SIGVOID */ 317 return; 318#endif /* !SIGVOID */ 319 } 320 for (pp = proclist.p_next; pp != NULL; pp = pp->p_next) 321 if (pid == pp->p_procid) 322 goto found; 323#if !defined(BSDJOBS) && !defined(WINNT) 324 /* this should never have happened */ 325 stderror(ERR_SYNC, pid); 326 xexit(0); 327#else /* BSDJOBS || WINNT */ 328 goto loop; 329#endif /* !BSDJOBS && !WINNT */ 330found: 331 pp->p_flags &= ~(PRUNNING | PSTOPPED | PREPORTED); 332 if (WIFSTOPPED(w)) { 333 pp->p_flags |= PSTOPPED; 334 pp->p_reason = WSTOPSIG(w); 335 } 336 else { 337 if (pp->p_flags & (PTIME | PPTIME) || adrof(STRtime)) 338#ifndef BSDTIMES 339# ifdef _SEQUENT_ 340 (void) get_process_stats(&pp->p_etime, PS_SELF, NULL, NULL); 341# else /* !_SEQUENT_ */ 342# ifndef COHERENT 343 pp->p_etime = times(&proctimes); 344# else /* COHERENT */ 345 pp->p_etime = HZ * time(NULL); 346 times(&proctimes); 347# endif /* COHERENT */ 348# endif /* !_SEQUENT_ */ 349#else /* BSDTIMES */ 350 (void) gettimeofday(&pp->p_etime, NULL); 351#endif /* BSDTIMES */ 352 353 354#if defined(BSDTIMES) || defined(_SEQUENT_) 355 pp->p_rusage = ru; 356#else /* !BSDTIMES && !_SEQUENT_ */ 357 (void) times(&proctimes); 358 pp->p_utime = proctimes.tms_cutime - shtimes.tms_cutime; 359 pp->p_stime = proctimes.tms_cstime - shtimes.tms_cstime; 360 shtimes = proctimes; 361#endif /* !BSDTIMES && !_SEQUENT_ */ 362 if (WIFSIGNALED(w)) { 363 if (WTERMSIG(w) == SIGINT) 364 pp->p_flags |= PINTERRUPTED; 365 else 366 pp->p_flags |= PSIGNALED; 367 if (WCOREDUMP(w)) 368 pp->p_flags |= PDUMPED; 369 pp->p_reason = WTERMSIG(w); 370 } 371 else { 372 pp->p_reason = WEXITSTATUS(w); 373 if (pp->p_reason != 0) 374 pp->p_flags |= PAEXITED; 375 else 376 pp->p_flags |= PNEXITED; 377 } 378 } 379 jobflags = 0; 380 fp = pp; 381 do { 382 if ((fp->p_flags & (PPTIME | PRUNNING | PSTOPPED)) == 0 && 383 !child && adrof(STRtime) && 384#ifdef BSDTIMES 385 fp->p_rusage.ru_utime.tv_sec + fp->p_rusage.ru_stime.tv_sec 386#else /* !BSDTIMES */ 387# ifdef _SEQUENT_ 388 fp->p_rusage.ps_utime.tv_sec + fp->p_rusage.ps_stime.tv_sec 389# else /* !_SEQUENT_ */ 390# ifndef POSIX 391 (fp->p_utime + fp->p_stime) / HZ 392# else /* POSIX */ 393 (fp->p_utime + fp->p_stime) / clk_tck 394# endif /* POSIX */ 395# endif /* !_SEQUENT_ */ 396#endif /* !BSDTIMES */ 397 >= atoi(short2str(varval(STRtime)))) 398 fp->p_flags |= PTIME; 399 jobflags |= fp->p_flags; 400 } while ((fp = fp->p_friends) != pp); 401 pp->p_flags &= ~PFOREGND; 402 if (pp == pp->p_friends && (pp->p_flags & PPTIME)) { 403 pp->p_flags &= ~PPTIME; 404 pp->p_flags |= PTIME; 405 } 406 if ((jobflags & (PRUNNING | PREPORTED)) == 0) { 407 fp = pp; 408 do { 409 if (fp->p_flags & PSTOPPED) 410 fp->p_flags |= PREPORTED; 411 } while ((fp = fp->p_friends) != pp); 412 while (fp->p_procid != fp->p_jobid) 413 fp = fp->p_friends; 414 if (jobflags & PSTOPPED) { 415 if (pcurrent && pcurrent != fp) 416 pprevious = pcurrent; 417 pcurrent = fp; 418 } 419 else 420 pclrcurr(fp); 421 if (jobflags & PFOREGND) { 422 if (!(jobflags & (PSIGNALED | PSTOPPED | PPTIME) || 423#ifdef notdef 424 jobflags & PAEXITED || 425#endif /* notdef */ 426 !eq(dcwd->di_name, fp->p_cwd->di_name))) { 427 /* PWP: print a newline after ^C */ 428 if (jobflags & PINTERRUPTED) { 429#ifdef SHORT_STRINGS 430 xputchar('\r' | QUOTE), xputchar('\n'); 431#else /* !SHORT_STRINGS */ 432 xprintf("\215\n"); /* \215 is a quoted ^M */ 433#endif /* !SHORT_STRINGS */ 434 } 435#ifdef notdef 436 else if ((jobflags & (PTIME|PSTOPPED)) == PTIME) 437 ptprint(fp); 438#endif /* notdef */ 439 } 440 } 441 else { 442 if (jobflags & PNOTIFY || adrof(STRnotify)) { 443#ifdef SHORT_STRINGS 444 xputchar('\r' | QUOTE), xputchar('\n'); 445#else /* !SHORT_STRINGS */ 446 xprintf("\215\n"); /* \215 is a quoted ^M */ 447#endif /* !SHORT_STRINGS */ 448 (void) pprint(pp, NUMBER | NAME | REASON); 449 if ((jobflags & PSTOPPED) == 0) 450 pflush(pp); 451 { 452 extern Char GettingInput; 453 454 if (GettingInput) { 455 errno = 0; 456 (void) Rawmode(); 457#ifdef notdef 458 /* 459 * don't really want to do that, because it 460 * will erase our message in case of multi-line 461 * input 462 */ 463 ClearLines(); 464#endif /* notdef */ 465 ClearDisp(); 466 Refresh(); 467 } 468 } 469 } 470 else { 471 fp->p_flags |= PNEEDNOTE; 472 neednote++; 473 } 474 } 475 } 476#if defined(BSDJOBS) || defined(HAVEwait3) 477 goto loop; 478#endif /* BSDJOBS || HAVEwait3 */ 479} 480 481void 482pnote() 483{ 484 register struct process *pp; 485 int flags; 486#ifdef BSDSIGS 487 sigmask_t omask; 488#endif /* BSDSIGS */ 489 490 neednote = 0; 491 for (pp = proclist.p_next; pp != NULL; pp = pp->p_next) { 492 if (pp->p_flags & PNEEDNOTE) { 493#ifdef BSDSIGS 494 omask = sigblock(sigmask(SIGCHLD)); 495#else /* !BSDSIGS */ 496 (void) sighold(SIGCHLD); 497#endif /* !BSDSIGS */ 498 pp->p_flags &= ~PNEEDNOTE; 499 flags = pprint(pp, NUMBER | NAME | REASON); 500 if ((flags & (PRUNNING | PSTOPPED)) == 0) 501 pflush(pp); 502#ifdef BSDSIGS 503 (void) sigsetmask(omask); 504#else /* !BSDSIGS */ 505 (void) sigrelse(SIGCHLD); 506#endif /* !BSDSIGS */ 507 } 508 } 509} 510 511 512static void 513pfree(pp) 514 struct process *pp; 515{ 516 xfree((ptr_t) pp->p_command); 517 if (pp->p_cwd && --pp->p_cwd->di_count == 0) 518 if (pp->p_cwd->di_next == 0) 519 dfree(pp->p_cwd); 520 xfree((ptr_t) pp); 521} 522 523 524/* 525 * pwait - wait for current job to terminate, maintaining integrity 526 * of current and previous job indicators. 527 */ 528void 529pwait() 530{ 531 register struct process *fp, *pp; 532#ifdef BSDSIGS 533 sigmask_t omask; 534#endif /* BSDSIGS */ 535 536 /* 537 * Here's where dead procs get flushed. 538 */ 539#ifdef BSDSIGS 540 omask = sigblock(sigmask(SIGCHLD)); 541#else /* !BSDSIGS */ 542 (void) sighold(SIGCHLD); 543#endif /* !BSDSIGS */ 544 for (pp = (fp = &proclist)->p_next; pp != NULL; pp = (fp = pp)->p_next) 545 if (pp->p_procid == 0) { 546 fp->p_next = pp->p_next; 547 pfree(pp); 548 pp = fp; 549 } 550#ifdef BSDSIGS 551 (void) sigsetmask(omask); 552#else /* !BSDSIGS */ 553 (void) sigrelse(SIGCHLD); 554# ifdef notdef 555 if (setintr) 556 sigignore(SIGINT); 557# endif /* notdef */ 558#endif /* !BSDSIGS */ 559 pjwait(pcurrjob); 560} 561 562 563/* 564 * pjwait - wait for a job to finish or become stopped 565 * It is assumed to be in the foreground state (PFOREGND) 566 */ 567void 568pjwait(pp) 569 register struct process *pp; 570{ 571 register struct process *fp; 572 int jobflags, reason; 573#ifdef BSDSIGS 574 sigmask_t omask; 575#endif /* BSDSIGS */ 576#ifdef UNRELSIGS 577 signalfun_t inthandler; 578#endif /* UNRELSIGS */ 579 while (pp->p_procid != pp->p_jobid) 580 pp = pp->p_friends; 581 fp = pp; 582 583 do { 584 if ((fp->p_flags & (PFOREGND | PRUNNING)) == PRUNNING) 585 xprintf(CGETS(17, 1, "BUG: waiting for background job!\n")); 586 } while ((fp = fp->p_friends) != pp); 587 /* 588 * Now keep pausing as long as we are not interrupted (SIGINT), and the 589 * target process, or any of its friends, are running 590 */ 591 fp = pp; 592#ifdef BSDSIGS 593 omask = sigblock(sigmask(SIGCHLD)); 594#endif /* BSDSIGS */ 595#ifdef UNRELSIGS 596 if (setintr) 597 inthandler = signal(SIGINT, SIG_IGN); 598#endif /* UNRELSIGS */ 599 for (;;) { 600#ifndef BSDSIGS 601 (void) sighold(SIGCHLD); 602#endif /* !BSDSIGS */ 603 jobflags = 0; 604 do 605 jobflags |= fp->p_flags; 606 while ((fp = (fp->p_friends)) != pp); 607 if ((jobflags & PRUNNING) == 0) 608 break; 609#ifdef JOBDEBUG 610 xprintf("%d starting to sigpause for SIGCHLD on %d\n", 611 getpid(), fp->p_procid); 612#endif /* JOBDEBUG */ 613#ifdef BSDSIGS 614 /* (void) sigpause(sigblock((sigmask_t) 0) &~ sigmask(SIGCHLD)); */ 615 (void) sigpause(omask & ~sigmask(SIGCHLD)); 616#else /* !BSDSIGS */ 617 (void) sigpause(SIGCHLD); 618#endif /* !BSDSIGS */ 619 } 620#ifdef JOBDEBUG 621 xprintf("%d returned from sigpause loop\n", getpid()); 622#endif /* JOBDEBUG */ 623#ifdef BSDSIGS 624 (void) sigsetmask(omask); 625#else /* !BSDSIGS */ 626 (void) sigrelse(SIGCHLD); 627#endif /* !BSDSIGS */ 628#ifdef UNRELSIGS 629 if (setintr) 630 (void) signal(SIGINT, inthandler); 631#endif /* UNRELSIGS */ 632#ifdef BSDJOBS 633 if (tpgrp > 0) /* get tty back */ 634 (void) tcsetpgrp(FSHTTY, tpgrp); 635#endif /* BSDJOBS */ 636 if ((jobflags & (PSIGNALED | PSTOPPED | PTIME)) || 637 !eq(dcwd->di_name, fp->p_cwd->di_name)) { 638 if (jobflags & PSTOPPED) { 639 xputchar('\n'); 640 if (adrof(STRlistjobs)) { 641 Char *jobcommand[3]; 642 643 jobcommand[0] = STRjobs; 644 if (eq(varval(STRlistjobs), STRlong)) 645 jobcommand[1] = STRml; 646 else 647 jobcommand[1] = NULL; 648 jobcommand[2] = NULL; 649 650 dojobs(jobcommand, NULL); 651 (void) pprint(pp, SHELLDIR); 652 } 653 else 654 (void) pprint(pp, AREASON | SHELLDIR); 655 } 656 else 657 (void) pprint(pp, AREASON | SHELLDIR); 658 } 659 if ((jobflags & (PINTERRUPTED | PSTOPPED)) && setintr && 660 (!gointr || !eq(gointr, STRminus))) { 661 if ((jobflags & PSTOPPED) == 0) 662 pflush(pp); 663 pintr1(0); 664 /* NOTREACHED */ 665 } 666 reason = 0; 667 fp = pp; 668 do { 669 if (fp->p_reason) 670 reason = fp->p_flags & (PSIGNALED | PINTERRUPTED) ? 671 fp->p_reason | META : fp->p_reason; 672 } while ((fp = fp->p_friends) != pp); 673 /* 674 * Don't report on backquoted jobs, cause it will mess up 675 * their output. 676 */ 677 if ((reason != 0) && (adrof(STRprintexitvalue)) && 678 (pp->p_flags & PBACKQ) == 0) 679 xprintf(CGETS(17, 2, "Exit %d\n"), reason); 680 set(STRstatus, putn(reason), VAR_READWRITE); 681 if (reason && exiterr) 682 exitstat(); 683 pflush(pp); 684} 685 686/* 687 * dowait - wait for all processes to finish 688 */ 689 690/*ARGSUSED*/ 691void 692dowait(v, c) 693 Char **v; 694 struct command *c; 695{ 696 register struct process *pp; 697#ifdef BSDSIGS 698 sigmask_t omask; 699#endif /* BSDSIGS */ 700 701 USE(c); 702 USE(v); 703 pjobs++; 704#ifdef BSDSIGS 705 omask = sigblock(sigmask(SIGCHLD)); 706loop: 707#else /* !BSDSIGS */ 708 if (setintr) 709 (void) sigrelse(SIGINT); 710loop: 711 (void) sighold(SIGCHLD); 712#endif /* !BSDSIGS */ 713 for (pp = proclist.p_next; pp; pp = pp->p_next) 714 if (pp->p_procid && /* pp->p_procid == pp->p_jobid && */ 715 pp->p_flags & PRUNNING) { 716#ifdef BSDSIGS 717 (void) sigpause((sigmask_t) 0); 718#else /* !BSDSIGS */ 719 (void) sigpause(SIGCHLD); 720#endif /* !BSDSIGS */ 721 goto loop; 722 } 723#ifdef BSDSIGS 724 (void) sigsetmask(omask); 725#else /* !BSDSIGS */ 726 (void) sigrelse(SIGCHLD); 727#endif /* !BSDSIGS */ 728 pjobs = 0; 729} 730 731/* 732 * pflushall - flush all jobs from list (e.g. at fork()) 733 */ 734static void 735pflushall() 736{ 737 register struct process *pp; 738 739 for (pp = proclist.p_next; pp != NULL; pp = pp->p_next) 740 if (pp->p_procid) 741 pflush(pp); 742} 743 744/* 745 * pflush - flag all process structures in the same job as the 746 * the argument process for deletion. The actual free of the 747 * space is not done here since pflush is called at interrupt level. 748 */ 749static void 750pflush(pp) 751 register struct process *pp; 752{ 753 register struct process *np; 754 register int idx; 755 756 if (pp->p_procid == 0) { 757 xprintf(CGETS(17, 3, "BUG: process flushed twice")); 758 return; 759 } 760 while (pp->p_procid != pp->p_jobid) 761 pp = pp->p_friends; 762 pclrcurr(pp); 763 if (pp == pcurrjob) 764 pcurrjob = 0; 765 idx = pp->p_index; 766 np = pp; 767 do { 768 np->p_index = np->p_procid = 0; 769 np->p_flags &= ~PNEEDNOTE; 770 } while ((np = np->p_friends) != pp); 771 if (idx == pmaxindex) { 772 for (np = proclist.p_next, idx = 0; np; np = np->p_next) 773 if (np->p_index > idx) 774 idx = np->p_index; 775 pmaxindex = idx; 776 } 777} 778 779/* 780 * pclrcurr - make sure the given job is not the current or previous job; 781 * pp MUST be the job leader 782 */ 783static void 784pclrcurr(pp) 785 register struct process *pp; 786{ 787 if (pp == pcurrent) { 788 if (pprevious != NULL) { 789 pcurrent = pprevious; 790 pprevious = pgetcurr(pp); 791 } 792 else { 793 pcurrent = pgetcurr(pp); 794 pprevious = pgetcurr(pp); 795 } 796 } 797 else if (pp == pprevious) 798 pprevious = pgetcurr(pp); 799} 800 801/* +4 here is 1 for '\0', 1 ea for << >& >> */ 802static Char command[PMAXLEN + 4]; 803static int cmdlen; 804static Char *cmdp; 805 806/* 807 * palloc - allocate a process structure and fill it up. 808 * an important assumption is made that the process is running. 809 */ 810void 811palloc(pid, t) 812 int pid; 813 register struct command *t; 814{ 815 register struct process *pp; 816 int i; 817 818 pp = (struct process *) xcalloc(1, (size_t) sizeof(struct process)); 819 pp->p_procid = pid; 820 pp->p_flags = ((t->t_dflg & F_AMPERSAND) ? 0 : PFOREGND) | PRUNNING; 821 if (t->t_dflg & F_TIME) 822 pp->p_flags |= PPTIME; 823 if (t->t_dflg & F_BACKQ) 824 pp->p_flags |= PBACKQ; 825 if (t->t_dflg & F_HUP) 826 pp->p_flags |= PHUP; 827 cmdp = command; 828 cmdlen = 0; 829 padd(t); 830 *cmdp++ = 0; 831 if (t->t_dflg & F_PIPEOUT) { 832 pp->p_flags |= PPOU; 833 if (t->t_dflg & F_STDERR) 834 pp->p_flags |= PDIAG; 835 } 836 pp->p_command = Strsave(command); 837 if (pcurrjob) { 838 struct process *fp; 839 840 /* careful here with interrupt level */ 841 pp->p_cwd = 0; 842 pp->p_index = pcurrjob->p_index; 843 pp->p_friends = pcurrjob; 844 pp->p_jobid = pcurrjob->p_procid; 845 for (fp = pcurrjob; fp->p_friends != pcurrjob; fp = fp->p_friends) 846 continue; 847 fp->p_friends = pp; 848 } 849 else { 850 pcurrjob = pp; 851 pp->p_jobid = pid; 852 pp->p_friends = pp; 853 pp->p_cwd = dcwd; 854 dcwd->di_count++; 855 if (pmaxindex < BIGINDEX) 856 pp->p_index = ++pmaxindex; 857 else { 858 struct process *np; 859 860 for (i = 1;; i++) { 861 for (np = proclist.p_next; np; np = np->p_next) 862 if (np->p_index == i) 863 goto tryagain; 864 pp->p_index = i; 865 if (i > pmaxindex) 866 pmaxindex = i; 867 break; 868 tryagain:; 869 } 870 } 871 if (pcurrent == NULL) 872 pcurrent = pp; 873 else if (pprevious == NULL) 874 pprevious = pp; 875 } 876 pp->p_next = proclist.p_next; 877 proclist.p_next = pp; 878#ifdef BSDTIMES 879 (void) gettimeofday(&pp->p_btime, NULL); 880#else /* !BSDTIMES */ 881# ifdef _SEQUENT_ 882 (void) get_process_stats(&pp->p_btime, PS_SELF, NULL, NULL); 883# else /* !_SEQUENT_ */ 884 { 885 struct tms tmptimes; 886 887# ifndef COHERENT 888 pp->p_btime = times(&tmptimes); 889# else /* !COHERENT */ 890 pp->p_btime = HZ * time(NULL); 891 times(&tmptimes); 892# endif /* !COHERENT */ 893 } 894# endif /* !_SEQUENT_ */ 895#endif /* !BSDTIMES */ 896} 897 898static void 899padd(t) 900 register struct command *t; 901{ 902 Char **argp; 903 904 if (t == 0) 905 return; 906 switch (t->t_dtyp) { 907 908 case NODE_PAREN: 909 pads(STRLparensp); 910 padd(t->t_dspr); 911 pads(STRspRparen); 912 break; 913 914 case NODE_COMMAND: 915 for (argp = t->t_dcom; *argp; argp++) { 916 pads(*argp); 917 if (argp[1]) 918 pads(STRspace); 919 } 920 break; 921 922 case NODE_OR: 923 case NODE_AND: 924 case NODE_PIPE: 925 case NODE_LIST: 926 padd(t->t_dcar); 927 switch (t->t_dtyp) { 928 case NODE_OR: 929 pads(STRspor2sp); 930 break; 931 case NODE_AND: 932 pads(STRspand2sp); 933 break; 934 case NODE_PIPE: 935 pads(STRsporsp); 936 break; 937 case NODE_LIST: 938 pads(STRsemisp); 939 break; 940 default: 941 break; 942 } 943 padd(t->t_dcdr); 944 return; 945 946 default: 947 break; 948 } 949 if ((t->t_dflg & F_PIPEIN) == 0 && t->t_dlef) { 950 pads((t->t_dflg & F_READ) ? STRspLarrow2sp : STRspLarrowsp); 951 pads(t->t_dlef); 952 } 953 if ((t->t_dflg & F_PIPEOUT) == 0 && t->t_drit) { 954 pads((t->t_dflg & F_APPEND) ? STRspRarrow2 : STRspRarrow); 955 if (t->t_dflg & F_STDERR) 956 pads(STRand); 957 pads(STRspace); 958 pads(t->t_drit); 959 } 960} 961 962static void 963pads(cp) 964 Char *cp; 965{ 966 register int i; 967 968 /* 969 * Avoid the Quoted Space alias hack! Reported by: 970 * sam@john-bigboote.ICS.UCI.EDU (Sam Horrocks) 971 */ 972 if (cp[0] == STRQNULL[0]) 973 cp++; 974 975 i = (int) Strlen(cp); 976 977 if (cmdlen >= PMAXLEN) 978 return; 979 if (cmdlen + i >= PMAXLEN) { 980 (void) Strcpy(cmdp, STRsp3dots); 981 cmdlen = PMAXLEN; 982 cmdp += 4; 983 return; 984 } 985 (void) Strcpy(cmdp, cp); 986 cmdp += i; 987 cmdlen += i; 988} 989 990/* 991 * psavejob - temporarily save the current job on a one level stack 992 * so another job can be created. Used for { } in exp6 993 * and `` in globbing. 994 */ 995void 996psavejob() 997{ 998 pholdjob = pcurrjob; 999 pcurrjob = NULL; 1000} 1001 1002/* 1003 * prestjob - opposite of psavejob. This may be missed if we are interrupted 1004 * somewhere, but pendjob cleans up anyway. 1005 */ 1006void 1007prestjob() 1008{ 1009 pcurrjob = pholdjob; 1010 pholdjob = NULL; 1011} 1012 1013/* 1014 * pendjob - indicate that a job (set of commands) has been completed 1015 * or is about to begin. 1016 */ 1017void 1018pendjob() 1019{ 1020 register struct process *pp, *tp; 1021 1022 if (pcurrjob && (pcurrjob->p_flags & (PFOREGND | PSTOPPED)) == 0) { 1023 pp = pcurrjob; 1024 while (pp->p_procid != pp->p_jobid) 1025 pp = pp->p_friends; 1026 xprintf("[%d]", pp->p_index); 1027 tp = pp; 1028 do { 1029 xprintf(" %d", pp->p_procid); 1030 pp = pp->p_friends; 1031 } while (pp != tp); 1032 xputchar('\n'); 1033 } 1034 pholdjob = pcurrjob = 0; 1035} 1036 1037/* 1038 * pprint - print a job 1039 */ 1040 1041/* 1042 * Hacks have been added for SVR4 to deal with pipe's being spawned in 1043 * reverse order 1044 * 1045 * David Dawes (dawes@physics.su.oz.au) Oct 1991 1046 */ 1047 1048static int 1049pprint(pp, flag) 1050 register struct process *pp; 1051 bool flag; 1052{ 1053 int status, reason; 1054 struct process *tp; 1055 extern char *linp, linbuf[]; 1056 int jobflags, pstatus, pcond; 1057 char *format; 1058 1059#ifdef BACKPIPE 1060 struct process *pipehead = NULL, *pipetail = NULL, *pmarker = NULL; 1061 int inpipe = 0; 1062#endif /* BACKPIPE */ 1063 1064 while (pp->p_procid != pp->p_jobid) 1065 pp = pp->p_friends; 1066 if (pp == pp->p_friends && (pp->p_flags & PPTIME)) { 1067 pp->p_flags &= ~PPTIME; 1068 pp->p_flags |= PTIME; 1069 } 1070 tp = pp; 1071 status = reason = -1; 1072 jobflags = 0; 1073 do { 1074#ifdef BACKPIPE 1075 /* 1076 * The pipeline is reversed, so locate the real head of the pipeline 1077 * if pp is at the tail of a pipe (and not already in a pipeline) 1078 */ 1079 if ((pp->p_friends->p_flags & PPOU) && !inpipe && (flag & NAME)) { 1080 inpipe = 1; 1081 pipetail = pp; 1082 do 1083 pp = pp->p_friends; 1084 while (pp->p_friends->p_flags & PPOU); 1085 pipehead = pp; 1086 pmarker = pp; 1087 /* 1088 * pmarker is used to hold the place of the proc being processed, so 1089 * we can search for the next one downstream later. 1090 */ 1091 } 1092 pcond = (int) (tp != pp || (inpipe && tp == pp)); 1093#else /* !BACKPIPE */ 1094 pcond = (int) (tp != pp); 1095#endif /* BACKPIPE */ 1096 1097 jobflags |= pp->p_flags; 1098 pstatus = (int) (pp->p_flags & PALLSTATES); 1099 if (pcond && linp != linbuf && !(flag & FANCY) && 1100 ((pstatus == status && pp->p_reason == reason) || 1101 !(flag & REASON))) 1102 xputchar(' '); 1103 else { 1104 if (pcond && linp != linbuf) 1105 xputchar('\n'); 1106 if (flag & NUMBER) { 1107#ifdef BACKPIPE 1108 pcond = ((pp == tp && !inpipe) || 1109 (inpipe && pipetail == tp && pp == pipehead)); 1110#else /* BACKPIPE */ 1111 pcond = (pp == tp); 1112#endif /* BACKPIPE */ 1113 if (pcond) 1114 xprintf("[%d]%s %c ", pp->p_index, 1115 pp->p_index < 10 ? " " : "", 1116 pp == pcurrent ? '+' : 1117 (pp == pprevious ? '-' : ' ')); 1118 else 1119 xprintf(" "); 1120 } 1121 if (flag & FANCY) { 1122#ifdef TCF 1123 extern char *sitename(); 1124 1125#endif /* TCF */ 1126 xprintf("%5d ", pp->p_procid); 1127#ifdef TCF 1128 xprintf("%11s ", sitename(pp->p_procid)); 1129#endif /* TCF */ 1130 } 1131 if (flag & (REASON | AREASON)) { 1132 if (flag & NAME) 1133 format = "%-30s"; 1134 else 1135 format = "%s"; 1136 if (pstatus == status) { 1137 if (pp->p_reason == reason) { 1138 xprintf(format, ""); 1139 goto prcomd; 1140 } 1141 else 1142 reason = (int) pp->p_reason; 1143 } 1144 else { 1145 status = pstatus; 1146 reason = (int) pp->p_reason; 1147 } 1148 switch (status) { 1149 1150 case PRUNNING: 1151 xprintf(format, CGETS(17, 4, "Running ")); 1152 break; 1153 1154 case PINTERRUPTED: 1155 case PSTOPPED: 1156 case PSIGNALED: 1157 /* 1158 * tell what happened to the background job 1159 * From: Michael Schroeder 1160 * <mlschroe@immd4.informatik.uni-erlangen.de> 1161 */ 1162 if ((flag & REASON) 1163 || ((flag & AREASON) 1164 && reason != SIGINT 1165 && (reason != SIGPIPE 1166 || (pp->p_flags & PPOU) == 0))) { 1167 char *ptr; 1168 char buf[1024]; 1169 1170 if ((ptr = mesg[pp->p_reason & ASCII].pname) == NULL) 1171 xsnprintf(ptr = buf, sizeof(buf), "%s %d", 1172 CGETS(17, 5, "Signal"), pp->p_reason & ASCII); 1173 xprintf(format, ptr); 1174 } 1175 else 1176 reason = -1; 1177 break; 1178 1179 case PNEXITED: 1180 case PAEXITED: 1181 if (flag & REASON) { 1182 if (pp->p_reason) 1183 xprintf(CGETS(17, 6, "Exit %-25d"), pp->p_reason); 1184 else 1185 xprintf(format, CGETS(17, 7, "Done")); 1186 } 1187 break; 1188 1189 default: 1190 xprintf(CGETS(17, 8, "BUG: status=%-9o"), 1191 status); 1192 } 1193 } 1194 } 1195prcomd: 1196 if (flag & NAME) { 1197 xprintf("%S", pp->p_command); 1198 if (pp->p_flags & PPOU) 1199 xprintf(" |"); 1200 if (pp->p_flags & PDIAG) 1201 xprintf("&"); 1202 } 1203 if (flag & (REASON | AREASON) && pp->p_flags & PDUMPED) 1204 xprintf(CGETS(17, 9, " (core dumped)")); 1205 if (tp == pp->p_friends) { 1206 if (flag & AMPERSAND) 1207 xprintf(" &"); 1208 if (flag & JOBDIR && 1209 !eq(tp->p_cwd->di_name, dcwd->di_name)) { 1210 xprintf(CGETS(17, 10, " (wd: ")); 1211 dtildepr(tp->p_cwd->di_name); 1212 xprintf(")"); 1213 } 1214 } 1215 if (pp->p_flags & PPTIME && !(status & (PSTOPPED | PRUNNING))) { 1216 if (linp != linbuf) 1217 xprintf("\n\t"); 1218#if defined(BSDTIMES) || defined(_SEQUENT_) 1219 prusage(&zru, &pp->p_rusage, &pp->p_etime, 1220 &pp->p_btime); 1221#else /* !BSDTIMES && !SEQUENT */ 1222 lru.tms_utime = pp->p_utime; 1223 lru.tms_stime = pp->p_stime; 1224 lru.tms_cutime = 0; 1225 lru.tms_cstime = 0; 1226 prusage(&zru, &lru, pp->p_etime, 1227 pp->p_btime); 1228#endif /* !BSDTIMES && !SEQUENT */ 1229 1230 } 1231#ifdef BACKPIPE 1232 pcond = ((tp == pp->p_friends && !inpipe) || 1233 (inpipe && pipehead->p_friends == tp && pp == pipetail)); 1234#else /* !BACKPIPE */ 1235 pcond = (tp == pp->p_friends); 1236#endif /* BACKPIPE */ 1237 if (pcond) { 1238 if (linp != linbuf) 1239 xputchar('\n'); 1240 if (flag & SHELLDIR && !eq(tp->p_cwd->di_name, dcwd->di_name)) { 1241 xprintf(CGETS(17, 11, "(wd now: ")); 1242 dtildepr(dcwd->di_name); 1243 xprintf(")\n"); 1244 } 1245 } 1246#ifdef BACKPIPE 1247 if (inpipe) { 1248 /* 1249 * if pmaker == pipetail, we are finished that pipeline, and 1250 * can now skip to past the head 1251 */ 1252 if (pmarker == pipetail) { 1253 inpipe = 0; 1254 pp = pipehead; 1255 } 1256 else { 1257 /* 1258 * set pp to one before the one we want next, so the while below 1259 * increments to the correct spot. 1260 */ 1261 do 1262 pp = pp->p_friends; 1263 while (pp->p_friends->p_friends != pmarker); 1264 pmarker = pp->p_friends; 1265 } 1266 } 1267 pcond = ((pp = pp->p_friends) != tp || inpipe); 1268#else /* !BACKPIPE */ 1269 pcond = ((pp = pp->p_friends) != tp); 1270#endif /* BACKPIPE */ 1271 } while (pcond); 1272 1273 if (jobflags & PTIME && (jobflags & (PSTOPPED | PRUNNING)) == 0) { 1274 if (jobflags & NUMBER) 1275 xprintf(" "); 1276 ptprint(tp); 1277 } 1278 return (jobflags); 1279} 1280 1281/* 1282 * All 4.3 BSD derived implementations are buggy and I've had enough. 1283 * The following implementation produces similar code and works in all 1284 * cases. The 4.3BSD one works only for <, >, != 1285 */ 1286# undef timercmp 1287# define timercmp(tvp, uvp, cmp) \ 1288 (((tvp)->tv_sec == (uvp)->tv_sec) ? \ 1289 ((tvp)->tv_usec cmp (uvp)->tv_usec) : \ 1290 ((tvp)->tv_sec cmp (uvp)->tv_sec)) 1291 1292static void 1293ptprint(tp) 1294 register struct process *tp; 1295{ 1296#ifdef BSDTIMES 1297 struct timeval tetime, diff; 1298 static struct timeval ztime; 1299 struct sysrusage ru; 1300 register struct process *pp = tp; 1301 1302 ru = zru; 1303 tetime = ztime; 1304 do { 1305 ruadd(&ru, &pp->p_rusage); 1306 tvsub(&diff, &pp->p_etime, &pp->p_btime); 1307 if (timercmp(&diff, &tetime, >)) 1308 tetime = diff; 1309 } while ((pp = pp->p_friends) != tp); 1310 prusage(&zru, &ru, &tetime, &ztime); 1311#else /* !BSDTIMES */ 1312# ifdef _SEQUENT_ 1313 timeval_t tetime, diff; 1314 static timeval_t ztime; 1315 struct process_stats ru; 1316 register struct process *pp = tp; 1317 1318 ru = zru; 1319 tetime = ztime; 1320 do { 1321 ruadd(&ru, &pp->p_rusage); 1322 tvsub(&diff, &pp->p_etime, &pp->p_btime); 1323 if (timercmp(&diff, &tetime, >)) 1324 tetime = diff; 1325 } while ((pp = pp->p_friends) != tp); 1326 prusage(&zru, &ru, &tetime, &ztime); 1327# else /* !_SEQUENT_ */ 1328# ifndef POSIX 1329 static time_t ztime = 0; 1330 static time_t zu_time = 0; 1331 static time_t zs_time = 0; 1332 time_t tetime, diff; 1333 time_t u_time, s_time; 1334 1335# else /* POSIX */ 1336 static clock_t ztime = 0; 1337 static clock_t zu_time = 0; 1338 static clock_t zs_time = 0; 1339 clock_t tetime, diff; 1340 clock_t u_time, s_time; 1341 1342# endif /* POSIX */ 1343 struct tms zts, rts; 1344 register struct process *pp = tp; 1345 1346 u_time = zu_time; 1347 s_time = zs_time; 1348 tetime = ztime; 1349 do { 1350 u_time += pp->p_utime; 1351 s_time += pp->p_stime; 1352 diff = pp->p_etime - pp->p_btime; 1353 if (diff > tetime) 1354 tetime = diff; 1355 } while ((pp = pp->p_friends) != tp); 1356 zts.tms_utime = zu_time; 1357 zts.tms_stime = zs_time; 1358 zts.tms_cutime = 0; 1359 zts.tms_cstime = 0; 1360 rts.tms_utime = u_time; 1361 rts.tms_stime = s_time; 1362 rts.tms_cutime = 0; 1363 rts.tms_cstime = 0; 1364 prusage(&zts, &rts, tetime, ztime); 1365# endif /* !_SEQUENT_ */ 1366#endif /* !BSDTIMES */ 1367} 1368 1369/* 1370 * dojobs - print all jobs 1371 */ 1372/*ARGSUSED*/ 1373void 1374dojobs(v, c) 1375 Char **v; 1376 struct command *c; 1377{ 1378 register struct process *pp; 1379 register int flag = NUMBER | NAME | REASON; 1380 int i; 1381 1382 USE(c); 1383 if (chkstop) 1384 chkstop = 2; 1385 if (*++v) { 1386 if (v[1] || !eq(*v, STRml)) 1387 stderror(ERR_JOBS); 1388 flag |= FANCY | JOBDIR; 1389 } 1390 for (i = 1; i <= pmaxindex; i++) 1391 for (pp = proclist.p_next; pp; pp = pp->p_next) 1392 if (pp->p_index == i && pp->p_procid == pp->p_jobid) { 1393 pp->p_flags &= ~PNEEDNOTE; 1394 if (!(pprint(pp, flag) & (PRUNNING | PSTOPPED))) 1395 pflush(pp); 1396 break; 1397 } 1398} 1399 1400/* 1401 * dofg - builtin - put the job into the foreground 1402 */ 1403/*ARGSUSED*/ 1404void 1405dofg(v, c) 1406 Char **v; 1407 struct command *c; 1408{ 1409 register struct process *pp; 1410 1411 USE(c); 1412 okpcntl(); 1413 ++v; 1414 do { 1415 pp = pfind(*v); 1416 if (!pstart(pp, 1)) { 1417 pp->p_procid = 0; 1418 stderror(ERR_NAME|ERR_BADJOB, pp->p_command, strerror(errno)); 1419 continue; 1420 } 1421#ifndef BSDSIGS 1422# ifdef notdef 1423 if (setintr) 1424 sigignore(SIGINT); 1425# endif 1426#endif /* !BSDSIGS */ 1427 pjwait(pp); 1428 } while (*v && *++v); 1429} 1430 1431/* 1432 * %... - builtin - put the job into the foreground 1433 */ 1434/*ARGSUSED*/ 1435void 1436dofg1(v, c) 1437 Char **v; 1438 struct command *c; 1439{ 1440 register struct process *pp; 1441 1442 USE(c); 1443 okpcntl(); 1444 pp = pfind(v[0]); 1445 if (!pstart(pp, 1)) { 1446 pp->p_procid = 0; 1447 stderror(ERR_NAME|ERR_BADJOB, pp->p_command, strerror(errno)); 1448 return; 1449 } 1450#ifndef BSDSIGS 1451# ifdef notdef 1452 if (setintr) 1453 sigignore(SIGINT); 1454# endif 1455#endif /* !BSDSIGS */ 1456 pjwait(pp); 1457} 1458 1459/* 1460 * dobg - builtin - put the job into the background 1461 */ 1462/*ARGSUSED*/ 1463void 1464dobg(v, c) 1465 Char **v; 1466 struct command *c; 1467{ 1468 register struct process *pp; 1469 1470 USE(c); 1471 okpcntl(); 1472 ++v; 1473 do { 1474 pp = pfind(*v); 1475 if (!pstart(pp, 0)) { 1476 pp->p_procid = 0; 1477 stderror(ERR_NAME|ERR_BADJOB, pp->p_command, strerror(errno)); 1478 } 1479 } while (*v && *++v); 1480} 1481 1482/* 1483 * %... & - builtin - put the job into the background 1484 */ 1485/*ARGSUSED*/ 1486void 1487dobg1(v, c) 1488 Char **v; 1489 struct command *c; 1490{ 1491 register struct process *pp; 1492 1493 USE(c); 1494 pp = pfind(v[0]); 1495 if (!pstart(pp, 0)) { 1496 pp->p_procid = 0; 1497 stderror(ERR_NAME|ERR_BADJOB, pp->p_command, strerror(errno)); 1498 } 1499} 1500 1501/* 1502 * dostop - builtin - stop the job 1503 */ 1504/*ARGSUSED*/ 1505void 1506dostop(v, c) 1507 Char **v; 1508 struct command *c; 1509{ 1510 USE(c); 1511#ifdef BSDJOBS 1512 pkill(++v, SIGSTOP); 1513#endif /* BSDJOBS */ 1514} 1515 1516/* 1517 * dokill - builtin - superset of kill (1) 1518 */ 1519/*ARGSUSED*/ 1520void 1521dokill(v, c) 1522 Char **v; 1523 struct command *c; 1524{ 1525 register int signum, len = 0; 1526 register char *name; 1527 extern int T_Cols; 1528 extern int nsig; 1529 1530 USE(c); 1531 v++; 1532 if (v[0] && v[0][0] == '-') { 1533 if (v[0][1] == 'l') { 1534 for (signum = 0; signum <= nsig; signum++) { 1535 if ((name = mesg[signum].iname) != NULL) { 1536 len += strlen(name) + 1; 1537 if (len >= T_Cols - 1) { 1538 xputchar('\n'); 1539 len = strlen(name) + 1; 1540 } 1541 xprintf("%s ", name); 1542 } 1543 } 1544 xputchar('\n'); 1545 return; 1546 } 1547 if (Isdigit(v[0][1])) { 1548 signum = atoi(short2str(v[0] + 1)); 1549 if (signum < 0 || signum > (MAXSIG-1)) 1550 stderror(ERR_NAME | ERR_BADSIG); 1551 } 1552 else { 1553 for (signum = 0; signum <= nsig; signum++) 1554 if (mesg[signum].iname && 1555 eq(&v[0][1], str2short(mesg[signum].iname))) 1556 goto gotsig; 1557 setname(short2str(&v[0][1])); 1558 stderror(ERR_NAME | ERR_UNKSIG); 1559 } 1560gotsig: 1561 v++; 1562 } 1563 else 1564 signum = SIGTERM; 1565 pkill(v, signum); 1566} 1567 1568static void 1569pkill(v, signum) 1570 Char **v; 1571 int signum; 1572{ 1573 register struct process *pp, *np; 1574 int jobflags = 0, err1 = 0; 1575 pid_t pid; 1576#ifdef BSDSIGS 1577 sigmask_t omask; 1578#endif /* BSDSIGS */ 1579 Char *cp, **vp; 1580 1581#ifdef BSDSIGS 1582 omask = sigmask(SIGCHLD); 1583 if (setintr) 1584 omask |= sigmask(SIGINT); 1585 omask = sigblock(omask) & ~omask; 1586#else /* !BSDSIGS */ 1587 if (setintr) 1588 (void) sighold(SIGINT); 1589 (void) sighold(SIGCHLD); 1590#endif /* !BSDSIGS */ 1591 1592 /* Avoid globbing %?x patterns */ 1593 for (vp = v; vp && *vp; vp++) 1594 if (**vp == '%') 1595 (void) quote(*vp); 1596 1597 gflag = 0, tglob(v); 1598 if (gflag) { 1599 v = globall(v); 1600 if (v == 0) 1601 stderror(ERR_NAME | ERR_NOMATCH); 1602 } 1603 else { 1604 v = gargv = saveblk(v); 1605 trim(v); 1606 } 1607 1608 1609 while (v && (cp = *v)) { 1610 if (*cp == '%') { 1611 np = pp = pfind(cp); 1612 do 1613 jobflags |= np->p_flags; 1614 while ((np = np->p_friends) != pp); 1615#ifdef BSDJOBS 1616 switch (signum) { 1617 1618 case SIGSTOP: 1619 case SIGTSTP: 1620 case SIGTTIN: 1621 case SIGTTOU: 1622 if ((jobflags & PRUNNING) == 0) { 1623# ifdef SUSPENDED 1624 xprintf(CGETS(17, 12, "%S: Already suspended\n"), cp); 1625# else /* !SUSPENDED */ 1626 xprintf(CGETS(17, 13, "%S: Already stopped\n"), cp); 1627# endif /* !SUSPENDED */ 1628 err1++; 1629 goto cont; 1630 } 1631 break; 1632 /* 1633 * suspend a process, kill -CONT %, then type jobs; the shell 1634 * says it is suspended, but it is running; thanks jaap.. 1635 */ 1636 case SIGCONT: 1637 if (!pstart(pp, 0)) { 1638 pp->p_procid = 0; 1639 stderror(ERR_NAME|ERR_BADJOB, pp->p_command, 1640 strerror(errno)); 1641 } 1642 goto cont; 1643 default: 1644 break; 1645 } 1646#endif /* BSDJOBS */ 1647 if (killpg(pp->p_jobid, signum) < 0) { 1648 xprintf("%S: %s\n", cp, strerror(errno)); 1649 err1++; 1650 } 1651#ifdef BSDJOBS 1652 if (signum == SIGTERM || signum == SIGHUP) 1653 (void) killpg(pp->p_jobid, SIGCONT); 1654#endif /* BSDJOBS */ 1655 } 1656 else if (!(Isdigit(*cp) || *cp == '-')) 1657 stderror(ERR_NAME | ERR_JOBARGS); 1658 else { 1659#ifndef WINNT 1660 pid = atoi(short2str(cp)); 1661#else 1662 pid = strtoul(short2str(cp),NULL,0); 1663#endif /* WINNT */ 1664 if (kill(pid, signum) < 0) { 1665 xprintf("%d: %s\n", pid, strerror(errno)); 1666 err1++; 1667 goto cont; 1668 } 1669#ifdef BSDJOBS 1670 if (signum == SIGTERM || signum == SIGHUP) 1671 (void) kill(pid, SIGCONT); 1672#endif /* BSDJOBS */ 1673 } 1674cont: 1675 v++; 1676 } 1677 if (gargv) 1678 blkfree(gargv), gargv = 0; 1679#ifdef BSDSIGS 1680 (void) sigsetmask(omask); 1681#else /* !BSDSIGS */ 1682 (void) sigrelse(SIGCHLD); 1683 if (setintr) 1684 (void) sigrelse(SIGINT); 1685#endif /* !BSDSIGS */ 1686 if (err1) 1687 stderror(ERR_SILENT); 1688} 1689 1690/* 1691 * pstart - start the job in foreground/background 1692 */ 1693int 1694pstart(pp, foregnd) 1695 register struct process *pp; 1696 int foregnd; 1697{ 1698 int rv = 0; 1699 register struct process *np; 1700#ifdef BSDSIGS 1701 sigmask_t omask; 1702#endif /* BSDSIGS */ 1703 /* We don't use jobflags in this function right now (see below) */ 1704 /* long jobflags = 0; */ 1705 1706#ifdef BSDSIGS 1707 omask = sigblock(sigmask(SIGCHLD)); 1708#else /* !BSDSIGS */ 1709 (void) sighold(SIGCHLD); 1710#endif 1711 np = pp; 1712 do { 1713 /* We don't use jobflags in this function right now (see below) */ 1714 /* jobflags |= np->p_flags; */ 1715 if (np->p_flags & (PRUNNING | PSTOPPED)) { 1716 np->p_flags |= PRUNNING; 1717 np->p_flags &= ~PSTOPPED; 1718 if (foregnd) 1719 np->p_flags |= PFOREGND; 1720 else 1721 np->p_flags &= ~PFOREGND; 1722 } 1723 } while ((np = np->p_friends) != pp); 1724 if (!foregnd) 1725 pclrcurr(pp); 1726 (void) pprint(pp, foregnd ? NAME | JOBDIR : NUMBER | NAME | AMPERSAND); 1727#ifdef BSDJOBS 1728 if (foregnd) { 1729 rv = tcsetpgrp(FSHTTY, pp->p_jobid); 1730 } 1731 /* 1732 * 1. child process of csh (shell script) receives SIGTTIN/SIGTTOU 1733 * 2. parent process (csh) receives SIGCHLD 1734 * 3. The "csh" signal handling function pchild() is invoked 1735 * with a SIGCHLD signal. 1736 * 4. pchild() calls wait3(WNOHANG) which returns 0. 1737 * The child process is NOT ready to be waited for at this time. 1738 * pchild() returns without picking-up the correct status 1739 * for the child process which generated the SIGCHILD. 1740 * 5. CONSEQUENCE : csh is UNaware that the process is stopped 1741 * 6. THIS LINE HAS BEEN COMMENTED OUT : if (jobflags&PSTOPPED) 1742 * (beto@aixwiz.austin.ibm.com - aug/03/91) 1743 * 7. I removed the line completely and added extra checks for 1744 * pstart, so that if a job gets attached to and dies inside 1745 * a debugger it does not confuse the shell. [christos] 1746 * 8. on the nec sx-4 there seems to be a problem, which requires 1747 * a syscall(151, getpid(), getpid()) in osinit. Don't ask me 1748 * what this is doing. [schott@rzg.mpg.de] 1749 */ 1750 1751 if (rv != -1) 1752 rv = killpg(pp->p_jobid, SIGCONT); 1753#endif /* BSDJOBS */ 1754#ifdef BSDSIGS 1755 (void) sigsetmask(omask); 1756#else /* !BSDSIGS */ 1757 (void) sigrelse(SIGCHLD); 1758#endif /* !BSDSIGS */ 1759 return rv != -1; 1760} 1761 1762void 1763panystop(neednl) 1764 bool neednl; 1765{ 1766 register struct process *pp; 1767 1768 chkstop = 2; 1769 for (pp = proclist.p_next; pp; pp = pp->p_next) 1770 if (pp->p_flags & PSTOPPED) 1771 stderror(ERR_STOPPED, neednl ? "\n" : ""); 1772} 1773 1774struct process * 1775pfind(cp) 1776 Char *cp; 1777{ 1778 register struct process *pp, *np; 1779 1780 if (cp == 0 || cp[1] == 0 || eq(cp, STRcent2) || eq(cp, STRcentplus)) { 1781 if (pcurrent == NULL) 1782 stderror(ERR_NAME | ERR_JOBCUR); 1783 return (pcurrent); 1784 } 1785 if (eq(cp, STRcentminus) || eq(cp, STRcenthash)) { 1786 if (pprevious == NULL) 1787 stderror(ERR_NAME | ERR_JOBPREV); 1788 return (pprevious); 1789 } 1790 if (Isdigit(cp[1])) { 1791 int idx = atoi(short2str(cp + 1)); 1792 1793 for (pp = proclist.p_next; pp; pp = pp->p_next) 1794 if (pp->p_index == idx && pp->p_procid == pp->p_jobid) 1795 return (pp); 1796 stderror(ERR_NAME | ERR_NOSUCHJOB); 1797 } 1798 np = NULL; 1799 for (pp = proclist.p_next; pp; pp = pp->p_next) 1800 if (pp->p_procid == pp->p_jobid) { 1801 if (cp[1] == '?') { 1802 register Char *dp; 1803 1804 for (dp = pp->p_command; *dp; dp++) { 1805 if (*dp != cp[2]) 1806 continue; 1807 if (prefix(cp + 2, dp)) 1808 goto match; 1809 } 1810 } 1811 else if (prefix(cp + 1, pp->p_command)) { 1812 match: 1813 if (np) 1814 stderror(ERR_NAME | ERR_AMBIG); 1815 np = pp; 1816 } 1817 } 1818 if (np) 1819 return (np); 1820 stderror(ERR_NAME | (cp[1] == '?' ? ERR_JOBPAT : ERR_NOSUCHJOB)); 1821 /* NOTREACHED */ 1822 return (0); 1823} 1824 1825 1826/* 1827 * pgetcurr - find most recent job that is not pp, preferably stopped 1828 */ 1829static struct process * 1830pgetcurr(pp) 1831 register struct process *pp; 1832{ 1833 register struct process *np; 1834 register struct process *xp = NULL; 1835 1836 for (np = proclist.p_next; np; np = np->p_next) 1837 if (np != pcurrent && np != pp && np->p_procid && 1838 np->p_procid == np->p_jobid) { 1839 if (np->p_flags & PSTOPPED) 1840 return (np); 1841 if (xp == NULL) 1842 xp = np; 1843 } 1844 return (xp); 1845} 1846 1847/* 1848 * donotify - flag the job so as to report termination asynchronously 1849 */ 1850/*ARGSUSED*/ 1851void 1852donotify(v, c) 1853 Char **v; 1854 struct command *c; 1855{ 1856 register struct process *pp; 1857 1858 USE(c); 1859 pp = pfind(*++v); 1860 pp->p_flags |= PNOTIFY; 1861} 1862 1863/* 1864 * Do the fork and whatever should be done in the child side that 1865 * should not be done if we are not forking at all (like for simple builtin's) 1866 * Also do everything that needs any signals fiddled with in the parent side 1867 * 1868 * Wanttty tells whether process and/or tty pgrps are to be manipulated: 1869 * -1: leave tty alone; inherit pgrp from parent 1870 * 0: already have tty; manipulate process pgrps only 1871 * 1: want to claim tty; manipulate process and tty pgrps 1872 * It is usually just the value of tpgrp. 1873 */ 1874 1875int 1876pfork(t, wanttty) 1877 struct command *t; /* command we are forking for */ 1878 int wanttty; 1879{ 1880 register int pid; 1881 bool ignint = 0; 1882 int pgrp; 1883#ifdef BSDSIGS 1884 sigmask_t omask = 0; 1885#endif /* BSDSIGS */ 1886#ifdef SIGSYNCH 1887 sigvec_t osv; 1888 static sigvec_t nsv = {synch_handler, (sigset_t) ~0, 0}; 1889#endif /* SIGSYNCH */ 1890 1891 /* 1892 * A child will be uninterruptible only under very special conditions. 1893 * Remember that the semantics of '&' is implemented by disconnecting the 1894 * process from the tty so signals do not need to ignored just for '&'. 1895 * Thus signals are set to default action for children unless: we have had 1896 * an "onintr -" (then specifically ignored) we are not playing with 1897 * signals (inherit action) 1898 */ 1899 if (setintr) 1900 ignint = (tpgrp == -1 && (t->t_dflg & F_NOINTERRUPT)) 1901 || (gointr && eq(gointr, STRminus)); 1902 1903#ifdef COHERENT 1904 ignint |= gointr && eq(gointr, STRminus); 1905#endif /* COHERENT */ 1906 1907 /* 1908 * Check for maximum nesting of 16 processes to avoid Forking loops 1909 */ 1910 if (child == 16) 1911 stderror(ERR_NESTING, 16); 1912#ifdef SIGSYNCH 1913 if (mysigvec(SIGSYNCH, &nsv, &osv)) 1914 stderror(ERR_SYSTEM, "pfork: sigvec set", strerror(errno)); 1915#endif /* SIGSYNCH */ 1916 /* 1917 * Hold SIGCHLD until we have the process installed in our table. 1918 */ 1919 if (wanttty < 0) { 1920#ifdef BSDSIGS 1921 omask = sigblock(sigmask(SIGCHLD)); 1922#else /* !BSDSIGS */ 1923 (void) sighold(SIGCHLD); 1924#endif /* !BSDSIGS */ 1925 } 1926 while ((pid = fork()) == -1) 1927 if (setintr == 0) 1928 (void) sleep(FORKSLEEP); 1929 else { 1930 if (wanttty < 0) 1931#ifdef BSDSIGS 1932 (void) sigsetmask(omask); 1933#else /* !BSDSIGS */ 1934 (void) sigrelse(SIGCHLD); 1935 (void) sigrelse(SIGINT); 1936#endif /* !BSDSIGS */ 1937 stderror(ERR_NOPROC); 1938 } 1939 if (pid == 0) { 1940 settimes(); 1941 pgrp = pcurrjob ? pcurrjob->p_jobid : getpid(); 1942 pflushall(); 1943 pcurrjob = NULL; 1944#if !defined(BSDTIMES) && !defined(_SEQUENT_) 1945 timesdone = 0; 1946#endif /* !defined(BSDTIMES) && !defined(_SEQUENT_) */ 1947 child++; 1948 if (setintr) { 1949 setintr = 0; /* until I think otherwise */ 1950#ifndef BSDSIGS 1951 if (wanttty < 0) 1952 (void) sigrelse(SIGCHLD); 1953#endif /* !BSDSIGS */ 1954 /* 1955 * Children just get blown away on SIGINT, SIGQUIT unless "onintr 1956 * -" seen. 1957 */ 1958 (void) signal(SIGINT, ignint ? SIG_IGN : SIG_DFL); 1959 (void) signal(SIGQUIT, ignint ? SIG_IGN : SIG_DFL); 1960#ifdef BSDJOBS 1961 if (wanttty >= 0) { 1962 /* make stoppable */ 1963 (void) signal(SIGTSTP, SIG_DFL); 1964 (void) signal(SIGTTIN, SIG_DFL); 1965 (void) signal(SIGTTOU, SIG_DFL); 1966 } 1967#endif /* BSDJOBS */ 1968 (void) signal(SIGTERM, parterm); 1969 } 1970 else if (tpgrp == -1 && (t->t_dflg & F_NOINTERRUPT)) { 1971 (void) signal(SIGINT, SIG_IGN); 1972 (void) signal(SIGQUIT, SIG_IGN); 1973 } 1974#ifdef OREO 1975 sigignore(SIGIO); /* ignore SIGIO in child too */ 1976#endif /* OREO */ 1977 1978 pgetty(wanttty, pgrp); 1979 /* 1980 * Nohup and nice apply only to NODE_COMMAND's but it would be nice 1981 * (?!?) if you could say "nohup (foo;bar)" Then the parser would have 1982 * to know about nice/nohup/time 1983 */ 1984 if (t->t_dflg & F_NOHUP) 1985 (void) signal(SIGHUP, SIG_IGN); 1986 if (t->t_dflg & F_NICE) { 1987 int nval = SIGN_EXTEND_CHAR(t->t_nice); 1988#ifdef BSDNICE 1989 (void) setpriority(PRIO_PROCESS, 0, nval); 1990#else /* !BSDNICE */ 1991 (void) nice(nval); 1992#endif /* !BSDNICE */ 1993 } 1994#ifdef F_VER 1995 if (t->t_dflg & F_VER) { 1996 tsetenv(STRSYSTYPE, t->t_systype ? STRbsd43 : STRsys53); 1997 dohash(NULL, NULL); 1998 } 1999#endif /* F_VER */ 2000#ifdef SIGSYNCH 2001 /* rfw 8/89 now parent can continue */ 2002 if (kill(getppid(), SIGSYNCH)) 2003 stderror(ERR_SYSTEM, "pfork child: kill", strerror(errno)); 2004#endif /* SIGSYNCH */ 2005 2006 } 2007 else { 2008#ifdef POSIXJOBS 2009 if (wanttty >= 0) { 2010 /* 2011 * `Walking' process group fix from Beto Appleton. 2012 * (beto@aixwiz.austin.ibm.com) 2013 * If setpgid fails at this point that means that 2014 * our process leader has died. We flush the current 2015 * job and become the process leader ourselves. 2016 * The parent will figure that out later. 2017 */ 2018 pgrp = pcurrjob ? pcurrjob->p_jobid : pid; 2019 if (setpgid(pid, pgrp) == -1 && errno == EPERM) { 2020 pcurrjob = NULL; 2021 /* 2022 * We don't care if this causes an error here; 2023 * then we are already in the right process group 2024 */ 2025 (void) setpgid(pid, pgrp = pid); 2026 } 2027 } 2028#endif /* POSIXJOBS */ 2029 palloc(pid, t); 2030#ifdef SIGSYNCH 2031 /* 2032 * rfw 8/89 Wait for child to own terminal. Solves half of ugly 2033 * synchronization problem. With this change, we know that the only 2034 * reason setpgrp to a previous process in a pipeline can fail is that 2035 * the previous process has already exited. Without this hack, he may 2036 * either have exited or not yet started to run. Two uglies become 2037 * one. 2038 */ 2039 (void) sigpause(omask & ~SYNCHMASK); 2040 if (mysigvec(SIGSYNCH, &osv, NULL)) 2041 stderror(ERR_SYSTEM, "pfork parent: sigvec restore", 2042 strerror(errno)); 2043#endif /* SIGSYNCH */ 2044 2045 if (wanttty < 0) { 2046#ifdef BSDSIGS 2047 (void) sigsetmask(omask); 2048#else /* !BSDSIGS */ 2049 (void) sigrelse(SIGCHLD); 2050#endif /* !BSDSIGS */ 2051 } 2052 } 2053 return (pid); 2054} 2055 2056static void 2057okpcntl() 2058{ 2059 if (tpgrp == -1) 2060 stderror(ERR_JOBCONTROL); 2061 if (tpgrp == 0) 2062 stderror(ERR_JOBCTRLSUB); 2063} 2064 2065 2066static void 2067setttypgrp(pgrp) 2068 int pgrp; 2069{ 2070 /* 2071 * If we are piping out a builtin, eg. 'echo | more' things can go 2072 * out of sequence, i.e. the more can run before the echo. This 2073 * can happen even if we have vfork, since the echo will be forked 2074 * with the regular fork. In this case, we need to set the tty 2075 * pgrp ourselves. If that happens, then the process will be still 2076 * alive. And the tty process group will already be set. 2077 * This should fix the famous sequent problem as a side effect: 2078 * The controlling terminal is lost if all processes in the 2079 * terminal process group are zombies. In this case tcgetpgrp() 2080 * returns 0. If this happens we must set the terminal process 2081 * group again. 2082 */ 2083 if (tcgetpgrp(FSHTTY) != pgrp) { 2084#ifdef POSIXJOBS 2085 /* 2086 * tcsetpgrp will set SIGTTOU to all the the processes in 2087 * the background according to POSIX... We ignore this here. 2088 */ 2089 signalfun_t old = sigset(SIGTTOU, SIG_IGN); 2090#endif 2091 (void) tcsetpgrp(FSHTTY, pgrp); 2092# ifdef POSIXJOBS 2093 (void) sigset(SIGTTOU, old); 2094# endif 2095 2096 } 2097} 2098 2099 2100/* 2101 * if we don't have vfork(), things can still go in the wrong order 2102 * resulting in the famous 'Stopped (tty output)'. But some systems 2103 * don't permit the setpgid() call, (these are more recent secure 2104 * systems such as ibm's aix), when they do. Then we'd rather print 2105 * an error message than hang the shell! 2106 * I am open to suggestions how to fix that. 2107 */ 2108void 2109pgetty(wanttty, pgrp) 2110 int wanttty, pgrp; 2111{ 2112#ifdef BSDJOBS 2113# if defined(BSDSIGS) && defined(POSIXJOBS) 2114 sigmask_t omask = 0; 2115# endif /* BSDSIGS && POSIXJOBS */ 2116 2117# ifdef JOBDEBUG 2118 xprintf("wanttty %d pid %d opgrp%d pgrp %d tpgrp %d\n", 2119 wanttty, getpid(), pgrp, mygetpgrp(), tcgetpgrp(FSHTTY)); 2120# endif /* JOBDEBUG */ 2121# ifdef POSIXJOBS 2122 /* 2123 * christos: I am blocking the tty signals till I've set things 2124 * correctly.... 2125 */ 2126 if (wanttty > 0) 2127# ifdef BSDSIGS 2128 omask = sigblock(sigmask(SIGTSTP)|sigmask(SIGTTIN)); 2129# else /* !BSDSIGS */ 2130 { 2131 (void) sighold(SIGTSTP); 2132 (void) sighold(SIGTTIN); 2133 } 2134# endif /* !BSDSIGS */ 2135# endif /* POSIXJOBS */ 2136 2137# ifndef POSIXJOBS 2138 if (wanttty > 0) 2139 setttypgrp(pgrp); 2140# endif /* !POSIXJOBS */ 2141 2142 /* 2143 * From: Michael Schroeder <mlschroe@immd4.informatik.uni-erlangen.de> 2144 * Don't check for tpgrp >= 0 so even non-interactive shells give 2145 * background jobs process groups Same for the comparison in the other part 2146 * of the #ifdef 2147 */ 2148 if (wanttty >= 0) { 2149 if (setpgid(0, pgrp) == -1) { 2150# ifdef POSIXJOBS 2151 /* Walking process group fix; see above */ 2152 if (setpgid(0, pgrp = getpid()) == -1) { 2153# endif /* POSIXJOBS */ 2154 stderror(ERR_SYSTEM, "setpgid child:\n", strerror(errno)); 2155 xexit(0); 2156# ifdef POSIXJOBS 2157 } 2158 wanttty = pgrp; /* Now we really want the tty, since we became the 2159 * the process group leader 2160 */ 2161# endif /* POSIXJOBS */ 2162 } 2163 } 2164 2165# ifdef POSIXJOBS 2166 if (wanttty > 0) 2167 setttypgrp(pgrp); 2168# ifdef BSDSIGS 2169 (void) sigsetmask(omask); 2170# else /* BSDSIGS */ 2171 (void) sigrelse(SIGTSTP); 2172 (void) sigrelse(SIGTTIN); 2173# endif /* !BSDSIGS */ 2174# endif /* POSIXJOBS */ 2175 2176# ifdef JOBDEBUG 2177 xprintf("wanttty %d pid %d pgrp %d tpgrp %d\n", 2178 wanttty, getpid(), mygetpgrp(), tcgetpgrp(FSHTTY)); 2179# endif /* JOBDEBUG */ 2180 2181 if (tpgrp > 0) 2182 tpgrp = 0; /* gave tty away */ 2183#endif /* BSDJOBS */ 2184} 2185