jobs.c revision 18016
11556Srgrimes/*- 21556Srgrimes * Copyright (c) 1991, 1993 31556Srgrimes * The Regents of the University of California. All rights reserved. 41556Srgrimes * 51556Srgrimes * This code is derived from software contributed to Berkeley by 61556Srgrimes * Kenneth Almquist. 71556Srgrimes * 81556Srgrimes * Redistribution and use in source and binary forms, with or without 91556Srgrimes * modification, are permitted provided that the following conditions 101556Srgrimes * are met: 111556Srgrimes * 1. Redistributions of source code must retain the above copyright 121556Srgrimes * notice, this list of conditions and the following disclaimer. 131556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141556Srgrimes * notice, this list of conditions and the following disclaimer in the 151556Srgrimes * documentation and/or other materials provided with the distribution. 161556Srgrimes * 3. All advertising materials mentioning features or use of this software 171556Srgrimes * must display the following acknowledgement: 181556Srgrimes * This product includes software developed by the University of 191556Srgrimes * California, Berkeley and its contributors. 201556Srgrimes * 4. Neither the name of the University nor the names of its contributors 211556Srgrimes * may be used to endorse or promote products derived from this software 221556Srgrimes * without specific prior written permission. 231556Srgrimes * 241556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 251556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 261556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 271556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 281556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 291556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 301556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 311556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 321556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 331556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 341556Srgrimes * SUCH DAMAGE. 353044Sdg * 3618016Speter * $Id: jobs.c,v 1.5 1996/09/01 10:20:24 peter Exp $ 371556Srgrimes */ 381556Srgrimes 391556Srgrimes#ifndef lint 4017987Speterstatic char sccsid[] = "@(#)jobs.c 8.5 (Berkeley) 5/4/95"; 411556Srgrimes#endif /* not lint */ 421556Srgrimes 4317987Speter#include <fcntl.h> 4417987Speter#include <signal.h> 4517987Speter#include <errno.h> 4617987Speter#include <unistd.h> 4717987Speter#include <stdlib.h> 4817987Speter#include <sys/types.h> 4917987Speter#include <sys/param.h> 5017987Speter#ifdef BSD 5117987Speter#include <sys/wait.h> 5217987Speter#include <sys/time.h> 5317987Speter#include <sys/resource.h> 5417987Speter#endif 5517987Speter 561556Srgrimes#include "shell.h" 571556Srgrimes#if JOBS 5817987Speter#ifdef OLD_TTY_DRIVER 591556Srgrimes#include "sgtty.h" 6017987Speter#else 6117987Speter#include <termios.h> 6217987Speter#endif 631556Srgrimes#undef CEOF /* syntax.h redefines this */ 641556Srgrimes#endif 6517987Speter#include "redir.h" 6617987Speter#include "show.h" 671556Srgrimes#include "main.h" 681556Srgrimes#include "parser.h" 691556Srgrimes#include "nodes.h" 701556Srgrimes#include "jobs.h" 711556Srgrimes#include "options.h" 721556Srgrimes#include "trap.h" 731556Srgrimes#include "syntax.h" 741556Srgrimes#include "input.h" 751556Srgrimes#include "output.h" 761556Srgrimes#include "memalloc.h" 771556Srgrimes#include "error.h" 781556Srgrimes#include "mystring.h" 791556Srgrimes 801556Srgrimes 811556Srgrimesstruct job *jobtab; /* array of jobs */ 821556Srgrimesint njobs; /* size of array */ 831556SrgrimesMKINIT short backgndpid = -1; /* pid of last background process */ 841556Srgrimes#if JOBS 851556Srgrimesint initialpgrp; /* pgrp of shell on invocation */ 861556Srgrimesshort curjob; /* current job */ 871556Srgrimes#endif 881556Srgrimes 8917987SpeterSTATIC void restartjob __P((struct job *)); 9017987SpeterSTATIC void freejob __P((struct job *)); 9117987SpeterSTATIC struct job *getjob __P((char *)); 9217987SpeterSTATIC int dowait __P((int, struct job *)); 9317987SpeterSTATIC int onsigchild __P((void)); 9417987SpeterSTATIC int waitproc __P((int, int *)); 9517987SpeterSTATIC void cmdtxt __P((union node *)); 9617987SpeterSTATIC void cmdputs __P((char *)); 971556Srgrimes 981556Srgrimes 991556Srgrimes/* 1001556Srgrimes * Turn job control on and off. 1011556Srgrimes * 1021556Srgrimes * Note: This code assumes that the third arg to ioctl is a character 1031556Srgrimes * pointer, which is true on Berkeley systems but not System V. Since 1041556Srgrimes * System V doesn't have job control yet, this isn't a problem now. 1051556Srgrimes */ 1061556Srgrimes 1071556SrgrimesMKINIT int jobctl; 1081556Srgrimes 1091556Srgrimesvoid 11017987Spetersetjobctl(on) 11117987Speter int on; 11217987Speter{ 1131556Srgrimes#ifdef OLD_TTY_DRIVER 1141556Srgrimes int ldisc; 1151556Srgrimes#endif 1161556Srgrimes 1171556Srgrimes if (on == jobctl || rootshell == 0) 1181556Srgrimes return; 1191556Srgrimes if (on) { 1201556Srgrimes do { /* while we are in the background */ 1211556Srgrimes if (ioctl(2, TIOCGPGRP, (char *)&initialpgrp) < 0) { 1221556Srgrimes out2str("sh: can't access tty; job control turned off\n"); 1231556Srgrimes mflag = 0; 1241556Srgrimes return; 1251556Srgrimes } 1261556Srgrimes if (initialpgrp == -1) 12717987Speter initialpgrp = getpgrp(); 12817987Speter else if (initialpgrp != getpgrp()) { 1291556Srgrimes killpg(initialpgrp, SIGTTIN); 1301556Srgrimes continue; 1311556Srgrimes } 1321556Srgrimes } while (0); 1331556Srgrimes#ifdef OLD_TTY_DRIVER 1341556Srgrimes if (ioctl(2, TIOCGETD, (char *)&ldisc) < 0 || ldisc != NTTYDISC) { 1351556Srgrimes out2str("sh: need new tty driver to run job control; job control turned off\n"); 1361556Srgrimes mflag = 0; 1371556Srgrimes return; 1381556Srgrimes } 1391556Srgrimes#endif 1401556Srgrimes setsignal(SIGTSTP); 1411556Srgrimes setsignal(SIGTTOU); 1421556Srgrimes setsignal(SIGTTIN); 14317987Speter setpgid(0, rootpid); 1441556Srgrimes ioctl(2, TIOCSPGRP, (char *)&rootpid); 1451556Srgrimes } else { /* turning job control off */ 14617987Speter setpgid(0, initialpgrp); 1471556Srgrimes ioctl(2, TIOCSPGRP, (char *)&initialpgrp); 1481556Srgrimes setsignal(SIGTSTP); 1491556Srgrimes setsignal(SIGTTOU); 1501556Srgrimes setsignal(SIGTTIN); 1511556Srgrimes } 1521556Srgrimes jobctl = on; 1531556Srgrimes} 1541556Srgrimes 1551556Srgrimes 1561556Srgrimes#ifdef mkinit 15717987SpeterINCLUDE <stdlib.h> 1581556Srgrimes 1591556SrgrimesSHELLPROC { 1601556Srgrimes backgndpid = -1; 1611556Srgrimes#if JOBS 1621556Srgrimes jobctl = 0; 1631556Srgrimes#endif 1641556Srgrimes} 1651556Srgrimes 1661556Srgrimes#endif 1671556Srgrimes 1681556Srgrimes 1691556Srgrimes 1701556Srgrimes#if JOBS 17117987Speterint 17217987Speterfgcmd(argc, argv) 17317987Speter int argc; 17417987Speter char **argv; 17517987Speter{ 1761556Srgrimes struct job *jp; 1771556Srgrimes int pgrp; 1781556Srgrimes int status; 1791556Srgrimes 1801556Srgrimes jp = getjob(argv[1]); 1811556Srgrimes if (jp->jobctl == 0) 1821556Srgrimes error("job not created under job control"); 1831556Srgrimes pgrp = jp->ps[0].pid; 1841556Srgrimes ioctl(2, TIOCSPGRP, (char *)&pgrp); 1851556Srgrimes restartjob(jp); 1861556Srgrimes INTOFF; 1871556Srgrimes status = waitforjob(jp); 1881556Srgrimes INTON; 1891556Srgrimes return status; 1901556Srgrimes} 1911556Srgrimes 1921556Srgrimes 19317987Speterint 19417987Speterbgcmd(argc, argv) 19517987Speter int argc; 19617987Speter char **argv; 19717987Speter{ 1981556Srgrimes struct job *jp; 1991556Srgrimes 2001556Srgrimes do { 2011556Srgrimes jp = getjob(*++argv); 2021556Srgrimes if (jp->jobctl == 0) 2031556Srgrimes error("job not created under job control"); 2041556Srgrimes restartjob(jp); 2051556Srgrimes } while (--argc > 1); 2061556Srgrimes return 0; 2071556Srgrimes} 2081556Srgrimes 2091556Srgrimes 2101556SrgrimesSTATIC void 2111556Srgrimesrestartjob(jp) 2121556Srgrimes struct job *jp; 21317987Speter{ 2141556Srgrimes struct procstat *ps; 2151556Srgrimes int i; 2161556Srgrimes 2171556Srgrimes if (jp->state == JOBDONE) 2181556Srgrimes return; 2191556Srgrimes INTOFF; 2201556Srgrimes killpg(jp->ps[0].pid, SIGCONT); 2211556Srgrimes for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { 2221556Srgrimes if ((ps->status & 0377) == 0177) { 2231556Srgrimes ps->status = -1; 2241556Srgrimes jp->state = 0; 2251556Srgrimes } 2261556Srgrimes } 2271556Srgrimes INTON; 2281556Srgrimes} 2291556Srgrimes#endif 2301556Srgrimes 2311556Srgrimes 2321556Srgrimesint 23317987Speterjobscmd(argc, argv) 23417987Speter int argc; 23517987Speter char **argv; 23617987Speter{ 2371556Srgrimes showjobs(0); 2381556Srgrimes return 0; 2391556Srgrimes} 2401556Srgrimes 2411556Srgrimes 2421556Srgrimes/* 2431556Srgrimes * Print a list of jobs. If "change" is nonzero, only print jobs whose 2441556Srgrimes * statuses have changed since the last call to showjobs. 2451556Srgrimes * 2461556Srgrimes * If the shell is interrupted in the process of creating a job, the 2471556Srgrimes * result may be a job structure containing zero processes. Such structures 2481556Srgrimes * will be freed here. 2491556Srgrimes */ 2501556Srgrimes 2511556Srgrimesvoid 25217987Spetershowjobs(change) 25317987Speter int change; 25417987Speter{ 2551556Srgrimes int jobno; 2561556Srgrimes int procno; 2571556Srgrimes int i; 2581556Srgrimes struct job *jp; 2591556Srgrimes struct procstat *ps; 2601556Srgrimes int col; 2611556Srgrimes char s[64]; 2621556Srgrimes 2631556Srgrimes TRACE(("showjobs(%d) called\n", change)); 2641556Srgrimes while (dowait(0, (struct job *)NULL) > 0); 2651556Srgrimes for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) { 2661556Srgrimes if (! jp->used) 2671556Srgrimes continue; 2681556Srgrimes if (jp->nprocs == 0) { 2691556Srgrimes freejob(jp); 2701556Srgrimes continue; 2711556Srgrimes } 2721556Srgrimes if (change && ! jp->changed) 2731556Srgrimes continue; 2741556Srgrimes procno = jp->nprocs; 2751556Srgrimes for (ps = jp->ps ; ; ps++) { /* for each process */ 2761556Srgrimes if (ps == jp->ps) 2771556Srgrimes fmtstr(s, 64, "[%d] %d ", jobno, ps->pid); 2781556Srgrimes else 2791556Srgrimes fmtstr(s, 64, " %d ", ps->pid); 2801556Srgrimes out1str(s); 2811556Srgrimes col = strlen(s); 2821556Srgrimes s[0] = '\0'; 2831556Srgrimes if (ps->status == -1) { 2841556Srgrimes /* don't print anything */ 2851556Srgrimes } else if ((ps->status & 0xFF) == 0) { 2861556Srgrimes fmtstr(s, 64, "Exit %d", ps->status >> 8); 2871556Srgrimes } else { 2881556Srgrimes i = ps->status; 2891556Srgrimes#if JOBS 2901556Srgrimes if ((i & 0xFF) == 0177) 2911556Srgrimes i >>= 8; 2921556Srgrimes#endif 29317987Speter if ((i & 0x7F) < NSIG && sys_siglist[i & 0x7F]) 29417987Speter scopy(sys_siglist[i & 0x7F], s); 2951556Srgrimes else 2961556Srgrimes fmtstr(s, 64, "Signal %d", i & 0x7F); 2971556Srgrimes if (i & 0x80) 2981556Srgrimes strcat(s, " (core dumped)"); 2991556Srgrimes } 3001556Srgrimes out1str(s); 3011556Srgrimes col += strlen(s); 3021556Srgrimes do { 3031556Srgrimes out1c(' '); 3041556Srgrimes col++; 3051556Srgrimes } while (col < 30); 3061556Srgrimes out1str(ps->cmd); 3071556Srgrimes out1c('\n'); 3081556Srgrimes if (--procno <= 0) 3091556Srgrimes break; 3101556Srgrimes } 3111556Srgrimes jp->changed = 0; 3121556Srgrimes if (jp->state == JOBDONE) { 3131556Srgrimes freejob(jp); 3141556Srgrimes } 3151556Srgrimes } 3161556Srgrimes} 3171556Srgrimes 3181556Srgrimes 3191556Srgrimes/* 3201556Srgrimes * Mark a job structure as unused. 3211556Srgrimes */ 3221556Srgrimes 3231556SrgrimesSTATIC void 3241556Srgrimesfreejob(jp) 3251556Srgrimes struct job *jp; 3261556Srgrimes { 3271556Srgrimes struct procstat *ps; 3281556Srgrimes int i; 3291556Srgrimes 3301556Srgrimes INTOFF; 3311556Srgrimes for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) { 3321556Srgrimes if (ps->cmd != nullstr) 3331556Srgrimes ckfree(ps->cmd); 3341556Srgrimes } 3351556Srgrimes if (jp->ps != &jp->ps0) 3361556Srgrimes ckfree(jp->ps); 3371556Srgrimes jp->used = 0; 3381556Srgrimes#if JOBS 3391556Srgrimes if (curjob == jp - jobtab + 1) 3401556Srgrimes curjob = 0; 3411556Srgrimes#endif 3421556Srgrimes INTON; 3431556Srgrimes} 3441556Srgrimes 3451556Srgrimes 3461556Srgrimes 3471556Srgrimesint 34817987Speterwaitcmd(argc, argv) 34917987Speter int argc; 35017987Speter char **argv; 35117987Speter{ 3521556Srgrimes struct job *job; 3531556Srgrimes int status; 3541556Srgrimes struct job *jp; 3551556Srgrimes 3561556Srgrimes if (argc > 1) { 3571556Srgrimes job = getjob(argv[1]); 3581556Srgrimes } else { 3591556Srgrimes job = NULL; 3601556Srgrimes } 3611556Srgrimes for (;;) { /* loop until process terminated or stopped */ 3621556Srgrimes if (job != NULL) { 3631556Srgrimes if (job->state) { 3641556Srgrimes status = job->ps[job->nprocs - 1].status; 3651556Srgrimes if ((status & 0xFF) == 0) 3661556Srgrimes status = status >> 8 & 0xFF; 3671556Srgrimes#if JOBS 3681556Srgrimes else if ((status & 0xFF) == 0177) 3691556Srgrimes status = (status >> 8 & 0x7F) + 128; 3701556Srgrimes#endif 3711556Srgrimes else 3721556Srgrimes status = (status & 0x7F) + 128; 3731556Srgrimes if (! iflag) 3741556Srgrimes freejob(job); 3751556Srgrimes return status; 3761556Srgrimes } 3771556Srgrimes } else { 3781556Srgrimes for (jp = jobtab ; ; jp++) { 3791556Srgrimes if (jp >= jobtab + njobs) { /* no running procs */ 3801556Srgrimes return 0; 3811556Srgrimes } 3821556Srgrimes if (jp->used && jp->state == 0) 3831556Srgrimes break; 3841556Srgrimes } 3851556Srgrimes } 3861556Srgrimes dowait(1, (struct job *)NULL); 3871556Srgrimes } 3881556Srgrimes} 3891556Srgrimes 3901556Srgrimes 3911556Srgrimes 39217987Speterint 39317987Speterjobidcmd(argc, argv) 39417987Speter int argc; 39517987Speter char **argv; 39617987Speter{ 3971556Srgrimes struct job *jp; 3981556Srgrimes int i; 3991556Srgrimes 4001556Srgrimes jp = getjob(argv[1]); 4011556Srgrimes for (i = 0 ; i < jp->nprocs ; ) { 4021556Srgrimes out1fmt("%d", jp->ps[i].pid); 4031556Srgrimes out1c(++i < jp->nprocs? ' ' : '\n'); 4041556Srgrimes } 4051556Srgrimes return 0; 4061556Srgrimes} 4071556Srgrimes 4081556Srgrimes 4091556Srgrimes 4101556Srgrimes/* 4111556Srgrimes * Convert a job name to a job structure. 4121556Srgrimes */ 4131556Srgrimes 4141556SrgrimesSTATIC struct job * 4151556Srgrimesgetjob(name) 4161556Srgrimes char *name; 4171556Srgrimes { 4181556Srgrimes int jobno; 4191556Srgrimes register struct job *jp; 4201556Srgrimes int pid; 4211556Srgrimes int i; 4221556Srgrimes 4231556Srgrimes if (name == NULL) { 4241556Srgrimes#if JOBS 4251556Srgrimescurrentjob: 4261556Srgrimes if ((jobno = curjob) == 0 || jobtab[jobno - 1].used == 0) 4271556Srgrimes error("No current job"); 4281556Srgrimes return &jobtab[jobno - 1]; 4291556Srgrimes#else 4301556Srgrimes error("No current job"); 4311556Srgrimes#endif 4321556Srgrimes } else if (name[0] == '%') { 4331556Srgrimes if (is_digit(name[1])) { 4341556Srgrimes jobno = number(name + 1); 4351556Srgrimes if (jobno > 0 && jobno <= njobs 4361556Srgrimes && jobtab[jobno - 1].used != 0) 4371556Srgrimes return &jobtab[jobno - 1]; 4381556Srgrimes#if JOBS 4391556Srgrimes } else if (name[1] == '%' && name[2] == '\0') { 4401556Srgrimes goto currentjob; 4411556Srgrimes#endif 4421556Srgrimes } else { 4431556Srgrimes register struct job *found = NULL; 4441556Srgrimes for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 4451556Srgrimes if (jp->used && jp->nprocs > 0 4461556Srgrimes && prefix(name + 1, jp->ps[0].cmd)) { 4471556Srgrimes if (found) 4481556Srgrimes error("%s: ambiguous", name); 4491556Srgrimes found = jp; 4501556Srgrimes } 4511556Srgrimes } 4521556Srgrimes if (found) 4531556Srgrimes return found; 4541556Srgrimes } 4551556Srgrimes } else if (is_number(name)) { 4561556Srgrimes pid = number(name); 4571556Srgrimes for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 4581556Srgrimes if (jp->used && jp->nprocs > 0 4591556Srgrimes && jp->ps[jp->nprocs - 1].pid == pid) 4601556Srgrimes return jp; 4611556Srgrimes } 4621556Srgrimes } 4631556Srgrimes error("No such job: %s", name); 46417987Speter /*NOTREACHED*/ 46517987Speter return NULL; 4661556Srgrimes} 4671556Srgrimes 4681556Srgrimes 4691556Srgrimes 4701556Srgrimes/* 4711556Srgrimes * Return a new job structure, 4721556Srgrimes */ 4731556Srgrimes 4741556Srgrimesstruct job * 4751556Srgrimesmakejob(node, nprocs) 4761556Srgrimes union node *node; 47717987Speter int nprocs; 47817987Speter{ 4791556Srgrimes int i; 4801556Srgrimes struct job *jp; 4811556Srgrimes 4821556Srgrimes for (i = njobs, jp = jobtab ; ; jp++) { 4831556Srgrimes if (--i < 0) { 4841556Srgrimes INTOFF; 4851556Srgrimes if (njobs == 0) { 4861556Srgrimes jobtab = ckmalloc(4 * sizeof jobtab[0]); 4871556Srgrimes } else { 48810934Sbde struct job *ojp; 48910934Sbde 4901556Srgrimes jp = ckmalloc((njobs + 4) * sizeof jobtab[0]); 49110934Sbde for (i = njobs, ojp = jobtab; --i >= 0; 49210934Sbde jp++, ojp++) 49310934Sbde if (ojp->ps == &ojp->ps0) 49410934Sbde ojp->ps = &jp->ps0; 49510934Sbde jp -= njobs; 49617987Speter memcpy(jp, jobtab, njobs * sizeof jp[0]); 4971556Srgrimes ckfree(jobtab); 4981556Srgrimes jobtab = jp; 4991556Srgrimes } 5001556Srgrimes jp = jobtab + njobs; 5011556Srgrimes for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0); 5021556Srgrimes INTON; 5031556Srgrimes break; 5041556Srgrimes } 5051556Srgrimes if (jp->used == 0) 5061556Srgrimes break; 5071556Srgrimes } 5081556Srgrimes INTOFF; 5091556Srgrimes jp->state = 0; 5101556Srgrimes jp->used = 1; 5111556Srgrimes jp->changed = 0; 5121556Srgrimes jp->nprocs = 0; 5131556Srgrimes#if JOBS 5141556Srgrimes jp->jobctl = jobctl; 5151556Srgrimes#endif 5161556Srgrimes if (nprocs > 1) { 5171556Srgrimes jp->ps = ckmalloc(nprocs * sizeof (struct procstat)); 5181556Srgrimes } else { 5191556Srgrimes jp->ps = &jp->ps0; 5201556Srgrimes } 5211556Srgrimes INTON; 52217987Speter TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long)node, nprocs, 52317987Speter jp - jobtab + 1)); 5241556Srgrimes return jp; 5258855Srgrimes} 5261556Srgrimes 5271556Srgrimes 5281556Srgrimes/* 5291556Srgrimes * Fork of a subshell. If we are doing job control, give the subshell its 5301556Srgrimes * own process group. Jp is a job structure that the job is to be added to. 5311556Srgrimes * N is the command that will be evaluated by the child. Both jp and n may 5321556Srgrimes * be NULL. The mode parameter can be one of the following: 5331556Srgrimes * FORK_FG - Fork off a foreground process. 5341556Srgrimes * FORK_BG - Fork off a background process. 5351556Srgrimes * FORK_NOJOB - Like FORK_FG, but don't give the process its own 5361556Srgrimes * process group even if job control is on. 5371556Srgrimes * 5381556Srgrimes * When job control is turned off, background processes have their standard 5391556Srgrimes * input redirected to /dev/null (except for the second and later processes 5401556Srgrimes * in a pipeline). 5411556Srgrimes */ 5421556Srgrimes 5431556Srgrimesint 5441556Srgrimesforkshell(jp, n, mode) 5451556Srgrimes union node *n; 5461556Srgrimes struct job *jp; 54717987Speter int mode; 54817987Speter{ 5491556Srgrimes int pid; 5501556Srgrimes int pgrp; 5511556Srgrimes 55217987Speter TRACE(("forkshell(%%%d, 0x%lx, %d) called\n", jp - jobtab, (long)n, 55317987Speter mode)); 5541556Srgrimes INTOFF; 5551556Srgrimes pid = fork(); 5561556Srgrimes if (pid == -1) { 5571556Srgrimes TRACE(("Fork failed, errno=%d\n", errno)); 5581556Srgrimes INTON; 5591556Srgrimes error("Cannot fork"); 5601556Srgrimes } 5611556Srgrimes if (pid == 0) { 5621556Srgrimes struct job *p; 5631556Srgrimes int wasroot; 5641556Srgrimes int i; 5651556Srgrimes 5661556Srgrimes TRACE(("Child shell %d\n", getpid())); 5671556Srgrimes wasroot = rootshell; 5681556Srgrimes rootshell = 0; 5691556Srgrimes for (i = njobs, p = jobtab ; --i >= 0 ; p++) 5701556Srgrimes if (p->used) 5711556Srgrimes freejob(p); 5721556Srgrimes closescript(); 5731556Srgrimes INTON; 5741556Srgrimes clear_traps(); 5751556Srgrimes#if JOBS 5761556Srgrimes jobctl = 0; /* do job control only in root shell */ 5771556Srgrimes if (wasroot && mode != FORK_NOJOB && mflag) { 5781556Srgrimes if (jp == NULL || jp->nprocs == 0) 5791556Srgrimes pgrp = getpid(); 5801556Srgrimes else 5811556Srgrimes pgrp = jp->ps[0].pid; 58217987Speter setpgid(0, pgrp); 5831556Srgrimes if (mode == FORK_FG) { 5841556Srgrimes /*** this causes superfluous TIOCSPGRPS ***/ 5851556Srgrimes if (ioctl(2, TIOCSPGRP, (char *)&pgrp) < 0) 58618016Speter error("TIOCSPGRP failed, errno=%d", errno); 5871556Srgrimes } 5881556Srgrimes setsignal(SIGTSTP); 5891556Srgrimes setsignal(SIGTTOU); 5901556Srgrimes } else if (mode == FORK_BG) { 5911556Srgrimes ignoresig(SIGINT); 5921556Srgrimes ignoresig(SIGQUIT); 5931556Srgrimes if ((jp == NULL || jp->nprocs == 0) && 5941556Srgrimes ! fd0_redirected_p ()) { 5951556Srgrimes close(0); 5961556Srgrimes if (open("/dev/null", O_RDONLY) != 0) 5971556Srgrimes error("Can't open /dev/null"); 5981556Srgrimes } 5991556Srgrimes } 6001556Srgrimes#else 6011556Srgrimes if (mode == FORK_BG) { 6021556Srgrimes ignoresig(SIGINT); 6031556Srgrimes ignoresig(SIGQUIT); 6041556Srgrimes if ((jp == NULL || jp->nprocs == 0) && 6051556Srgrimes ! fd0_redirected_p ()) { 6061556Srgrimes close(0); 6071556Srgrimes if (open("/dev/null", O_RDONLY) != 0) 6081556Srgrimes error("Can't open /dev/null"); 6091556Srgrimes } 6101556Srgrimes } 6111556Srgrimes#endif 6121556Srgrimes if (wasroot && iflag) { 6131556Srgrimes setsignal(SIGINT); 6141556Srgrimes setsignal(SIGQUIT); 6151556Srgrimes setsignal(SIGTERM); 6161556Srgrimes } 6171556Srgrimes return pid; 6181556Srgrimes } 6191556Srgrimes if (rootshell && mode != FORK_NOJOB && mflag) { 6201556Srgrimes if (jp == NULL || jp->nprocs == 0) 6211556Srgrimes pgrp = pid; 6221556Srgrimes else 6231556Srgrimes pgrp = jp->ps[0].pid; 62417987Speter setpgid(pid, pgrp); 6251556Srgrimes } 6261556Srgrimes if (mode == FORK_BG) 6271556Srgrimes backgndpid = pid; /* set $! */ 6281556Srgrimes if (jp) { 6291556Srgrimes struct procstat *ps = &jp->ps[jp->nprocs++]; 6301556Srgrimes ps->pid = pid; 6311556Srgrimes ps->status = -1; 6321556Srgrimes ps->cmd = nullstr; 6331556Srgrimes if (iflag && rootshell && n) 6341556Srgrimes ps->cmd = commandtext(n); 6351556Srgrimes } 6361556Srgrimes INTON; 6371556Srgrimes TRACE(("In parent shell: child = %d\n", pid)); 6381556Srgrimes return pid; 6391556Srgrimes} 6401556Srgrimes 6411556Srgrimes 6421556Srgrimes 6431556Srgrimes/* 6441556Srgrimes * Wait for job to finish. 6451556Srgrimes * 6461556Srgrimes * Under job control we have the problem that while a child process is 6471556Srgrimes * running interrupts generated by the user are sent to the child but not 6481556Srgrimes * to the shell. This means that an infinite loop started by an inter- 6491556Srgrimes * active user may be hard to kill. With job control turned off, an 6501556Srgrimes * interactive user may place an interactive program inside a loop. If 6511556Srgrimes * the interactive program catches interrupts, the user doesn't want 6521556Srgrimes * these interrupts to also abort the loop. The approach we take here 6531556Srgrimes * is to have the shell ignore interrupt signals while waiting for a 6541556Srgrimes * forground process to terminate, and then send itself an interrupt 6551556Srgrimes * signal if the child process was terminated by an interrupt signal. 6561556Srgrimes * Unfortunately, some programs want to do a bit of cleanup and then 6571556Srgrimes * exit on interrupt; unless these processes terminate themselves by 6581556Srgrimes * sending a signal to themselves (instead of calling exit) they will 6591556Srgrimes * confuse this approach. 6601556Srgrimes */ 6611556Srgrimes 6621556Srgrimesint 6631556Srgrimeswaitforjob(jp) 6641556Srgrimes register struct job *jp; 6651556Srgrimes { 6661556Srgrimes#if JOBS 66717987Speter int mypgrp = getpgrp(); 6681556Srgrimes#endif 6691556Srgrimes int status; 6701556Srgrimes int st; 6711556Srgrimes 6721556Srgrimes INTOFF; 6731556Srgrimes TRACE(("waitforjob(%%%d) called\n", jp - jobtab + 1)); 6741556Srgrimes while (jp->state == 0) { 6751556Srgrimes dowait(1, jp); 6761556Srgrimes } 6771556Srgrimes#if JOBS 6781556Srgrimes if (jp->jobctl) { 6791556Srgrimes if (ioctl(2, TIOCSPGRP, (char *)&mypgrp) < 0) 68018016Speter error("TIOCSPGRP failed, errno=%d", errno); 6811556Srgrimes } 6821556Srgrimes if (jp->state == JOBSTOPPED) 6831556Srgrimes curjob = jp - jobtab + 1; 6841556Srgrimes#endif 6851556Srgrimes status = jp->ps[jp->nprocs - 1].status; 6861556Srgrimes /* convert to 8 bits */ 6871556Srgrimes if ((status & 0xFF) == 0) 6881556Srgrimes st = status >> 8 & 0xFF; 6891556Srgrimes#if JOBS 6901556Srgrimes else if ((status & 0xFF) == 0177) 6911556Srgrimes st = (status >> 8 & 0x7F) + 128; 6921556Srgrimes#endif 6931556Srgrimes else 6941556Srgrimes st = (status & 0x7F) + 128; 6951556Srgrimes if (! JOBS || jp->state == JOBDONE) 6961556Srgrimes freejob(jp); 6971556Srgrimes CLEAR_PENDING_INT; 6981556Srgrimes if ((status & 0x7F) == SIGINT) 6991556Srgrimes kill(getpid(), SIGINT); 7001556Srgrimes INTON; 7011556Srgrimes return st; 7021556Srgrimes} 7031556Srgrimes 7041556Srgrimes 7051556Srgrimes 7061556Srgrimes/* 7071556Srgrimes * Wait for a process to terminate. 7081556Srgrimes */ 7091556Srgrimes 7101556SrgrimesSTATIC int 7111556Srgrimesdowait(block, job) 71217987Speter int block; 7131556Srgrimes struct job *job; 71417987Speter{ 7151556Srgrimes int pid; 7161556Srgrimes int status; 7171556Srgrimes struct procstat *sp; 7181556Srgrimes struct job *jp; 7191556Srgrimes struct job *thisjob; 7201556Srgrimes int done; 7211556Srgrimes int stopped; 7221556Srgrimes int core; 7231556Srgrimes 7241556Srgrimes TRACE(("dowait(%d) called\n", block)); 7251556Srgrimes do { 7261556Srgrimes pid = waitproc(block, &status); 7271556Srgrimes TRACE(("wait returns %d, status=%d\n", pid, status)); 7281556Srgrimes } while (pid == -1 && errno == EINTR); 7291556Srgrimes if (pid <= 0) 7301556Srgrimes return pid; 7311556Srgrimes INTOFF; 7321556Srgrimes thisjob = NULL; 7331556Srgrimes for (jp = jobtab ; jp < jobtab + njobs ; jp++) { 7341556Srgrimes if (jp->used) { 7351556Srgrimes done = 1; 7361556Srgrimes stopped = 1; 7371556Srgrimes for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) { 7381556Srgrimes if (sp->pid == -1) 7391556Srgrimes continue; 7401556Srgrimes if (sp->pid == pid) { 7411556Srgrimes TRACE(("Changin status of proc %d from 0x%x to 0x%x\n", pid, sp->status, status)); 7421556Srgrimes sp->status = status; 7431556Srgrimes thisjob = jp; 7441556Srgrimes } 7451556Srgrimes if (sp->status == -1) 7461556Srgrimes stopped = 0; 7471556Srgrimes else if ((sp->status & 0377) == 0177) 7481556Srgrimes done = 0; 7491556Srgrimes } 7501556Srgrimes if (stopped) { /* stopped or done */ 7511556Srgrimes int state = done? JOBDONE : JOBSTOPPED; 7521556Srgrimes if (jp->state != state) { 7531556Srgrimes TRACE(("Job %d: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state)); 7541556Srgrimes jp->state = state; 7551556Srgrimes#if JOBS 7561556Srgrimes if (done && curjob == jp - jobtab + 1) 7571556Srgrimes curjob = 0; /* no current job */ 7581556Srgrimes#endif 7591556Srgrimes } 7601556Srgrimes } 7611556Srgrimes } 7621556Srgrimes } 7631556Srgrimes INTON; 7641556Srgrimes if (! rootshell || ! iflag || (job && thisjob == job)) { 7651556Srgrimes#if JOBS 7661556Srgrimes if ((status & 0xFF) == 0177) 7671556Srgrimes status >>= 8; 7681556Srgrimes#endif 7691556Srgrimes core = status & 0x80; 7701556Srgrimes status &= 0x7F; 7711556Srgrimes if (status != 0 && status != SIGINT && status != SIGPIPE) { 7721556Srgrimes if (thisjob != job) 7731556Srgrimes outfmt(out2, "%d: ", pid); 7741556Srgrimes#if JOBS 7751556Srgrimes if (status == SIGTSTP && rootshell && iflag) 7761556Srgrimes outfmt(out2, "%%%d ", job - jobtab + 1); 7771556Srgrimes#endif 77817987Speter if (status < NSIG && sys_siglist[status]) 77917987Speter out2str(sys_siglist[status]); 7801556Srgrimes else 7811556Srgrimes outfmt(out2, "Signal %d", status); 7821556Srgrimes if (core) 7831556Srgrimes out2str(" - core dumped"); 7841556Srgrimes out2c('\n'); 7851556Srgrimes flushout(&errout); 7861556Srgrimes } else { 7871556Srgrimes TRACE(("Not printing status: status=%d\n", status)); 7881556Srgrimes } 7891556Srgrimes } else { 7901556Srgrimes TRACE(("Not printing status, rootshell=%d, job=0x%x\n", rootshell, job)); 7911556Srgrimes if (thisjob) 7921556Srgrimes thisjob->changed = 1; 7931556Srgrimes } 7941556Srgrimes return pid; 7951556Srgrimes} 7961556Srgrimes 7971556Srgrimes 7981556Srgrimes 7991556Srgrimes/* 8001556Srgrimes * Do a wait system call. If job control is compiled in, we accept 8011556Srgrimes * stopped processes. If block is zero, we return a value of zero 8021556Srgrimes * rather than blocking. 8031556Srgrimes * 8041556Srgrimes * System V doesn't have a non-blocking wait system call. It does 8051556Srgrimes * have a SIGCLD signal that is sent to a process when one of it's 8061556Srgrimes * children dies. The obvious way to use SIGCLD would be to install 8071556Srgrimes * a handler for SIGCLD which simply bumped a counter when a SIGCLD 8081556Srgrimes * was received, and have waitproc bump another counter when it got 8091556Srgrimes * the status of a process. Waitproc would then know that a wait 8101556Srgrimes * system call would not block if the two counters were different. 8111556Srgrimes * This approach doesn't work because if a process has children that 8121556Srgrimes * have not been waited for, System V will send it a SIGCLD when it 8131556Srgrimes * installs a signal handler for SIGCLD. What this means is that when 8141556Srgrimes * a child exits, the shell will be sent SIGCLD signals continuously 8151556Srgrimes * until is runs out of stack space, unless it does a wait call before 8161556Srgrimes * restoring the signal handler. The code below takes advantage of 8171556Srgrimes * this (mis)feature by installing a signal handler for SIGCLD and 8181556Srgrimes * then checking to see whether it was called. If there are any 8191556Srgrimes * children to be waited for, it will be. 8201556Srgrimes * 8211556Srgrimes * If neither SYSV nor BSD is defined, we don't implement nonblocking 8221556Srgrimes * waits at all. In this case, the user will not be informed when 8231556Srgrimes * a background process until the next time she runs a real program 8241556Srgrimes * (as opposed to running a builtin command or just typing return), 8251556Srgrimes * and the jobs command may give out of date information. 8261556Srgrimes */ 8271556Srgrimes 8281556Srgrimes#ifdef SYSV 8291556SrgrimesSTATIC int gotsigchild; 8301556Srgrimes 8311556SrgrimesSTATIC int onsigchild() { 8321556Srgrimes gotsigchild = 1; 8331556Srgrimes} 8341556Srgrimes#endif 8351556Srgrimes 8361556Srgrimes 8371556SrgrimesSTATIC int 8381556Srgrimeswaitproc(block, status) 83917987Speter int block; 8401556Srgrimes int *status; 84117987Speter{ 8421556Srgrimes#ifdef BSD 8431556Srgrimes int flags; 8441556Srgrimes 8451556Srgrimes#if JOBS 8461556Srgrimes flags = WUNTRACED; 8471556Srgrimes#else 8481556Srgrimes flags = 0; 8491556Srgrimes#endif 8501556Srgrimes if (block == 0) 8511556Srgrimes flags |= WNOHANG; 8521556Srgrimes return wait3(status, flags, (struct rusage *)NULL); 8531556Srgrimes#else 8541556Srgrimes#ifdef SYSV 8551556Srgrimes int (*save)(); 8561556Srgrimes 8571556Srgrimes if (block == 0) { 8581556Srgrimes gotsigchild = 0; 8591556Srgrimes save = signal(SIGCLD, onsigchild); 8601556Srgrimes signal(SIGCLD, save); 8611556Srgrimes if (gotsigchild == 0) 8621556Srgrimes return 0; 8631556Srgrimes } 8641556Srgrimes return wait(status); 8651556Srgrimes#else 8661556Srgrimes if (block == 0) 8671556Srgrimes return 0; 8681556Srgrimes return wait(status); 8691556Srgrimes#endif 8701556Srgrimes#endif 8711556Srgrimes} 8721556Srgrimes 8731556Srgrimes/* 8741556Srgrimes * return 1 if there are stopped jobs, otherwise 0 8751556Srgrimes */ 8761556Srgrimesint job_warning = 0; 8771556Srgrimesint 8781556Srgrimesstoppedjobs() 8791556Srgrimes{ 8801556Srgrimes register int jobno; 8811556Srgrimes register struct job *jp; 8821556Srgrimes 8831556Srgrimes if (job_warning) 8841556Srgrimes return (0); 8851556Srgrimes for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) { 8861556Srgrimes if (jp->used == 0) 8871556Srgrimes continue; 8881556Srgrimes if (jp->state == JOBSTOPPED) { 8891556Srgrimes out2str("You have stopped jobs.\n"); 8901556Srgrimes job_warning = 2; 8911556Srgrimes return (1); 8921556Srgrimes } 8931556Srgrimes } 8941556Srgrimes 8951556Srgrimes return (0); 8961556Srgrimes} 8971556Srgrimes 8981556Srgrimes/* 8991556Srgrimes * Return a string identifying a command (to be printed by the 9001556Srgrimes * jobs command. 9011556Srgrimes */ 9021556Srgrimes 9031556SrgrimesSTATIC char *cmdnextc; 9041556SrgrimesSTATIC int cmdnleft; 9051556SrgrimesSTATIC void cmdtxt(), cmdputs(); 9061556Srgrimes#define MAXCMDTEXT 200 9071556Srgrimes 9081556Srgrimeschar * 9091556Srgrimescommandtext(n) 9101556Srgrimes union node *n; 9111556Srgrimes { 9121556Srgrimes char *name; 9131556Srgrimes 9141556Srgrimes cmdnextc = name = ckmalloc(MAXCMDTEXT); 9151556Srgrimes cmdnleft = MAXCMDTEXT - 4; 9161556Srgrimes cmdtxt(n); 9171556Srgrimes *cmdnextc = '\0'; 9181556Srgrimes return name; 9191556Srgrimes} 9201556Srgrimes 9211556Srgrimes 9221556SrgrimesSTATIC void 9231556Srgrimescmdtxt(n) 9241556Srgrimes union node *n; 9251556Srgrimes { 9261556Srgrimes union node *np; 9271556Srgrimes struct nodelist *lp; 9281556Srgrimes char *p; 9291556Srgrimes int i; 9301556Srgrimes char s[2]; 9311556Srgrimes 9321556Srgrimes if (n == NULL) 9331556Srgrimes return; 9341556Srgrimes switch (n->type) { 9351556Srgrimes case NSEMI: 9361556Srgrimes cmdtxt(n->nbinary.ch1); 9371556Srgrimes cmdputs("; "); 9381556Srgrimes cmdtxt(n->nbinary.ch2); 9391556Srgrimes break; 9401556Srgrimes case NAND: 9411556Srgrimes cmdtxt(n->nbinary.ch1); 9421556Srgrimes cmdputs(" && "); 9431556Srgrimes cmdtxt(n->nbinary.ch2); 9441556Srgrimes break; 9451556Srgrimes case NOR: 9461556Srgrimes cmdtxt(n->nbinary.ch1); 9471556Srgrimes cmdputs(" || "); 9481556Srgrimes cmdtxt(n->nbinary.ch2); 9491556Srgrimes break; 9501556Srgrimes case NPIPE: 9511556Srgrimes for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 9521556Srgrimes cmdtxt(lp->n); 9531556Srgrimes if (lp->next) 9541556Srgrimes cmdputs(" | "); 9551556Srgrimes } 9561556Srgrimes break; 9571556Srgrimes case NSUBSHELL: 9581556Srgrimes cmdputs("("); 9591556Srgrimes cmdtxt(n->nredir.n); 9601556Srgrimes cmdputs(")"); 9611556Srgrimes break; 9621556Srgrimes case NREDIR: 9631556Srgrimes case NBACKGND: 9641556Srgrimes cmdtxt(n->nredir.n); 9651556Srgrimes break; 9661556Srgrimes case NIF: 9671556Srgrimes cmdputs("if "); 9681556Srgrimes cmdtxt(n->nif.test); 9691556Srgrimes cmdputs("; then "); 9701556Srgrimes cmdtxt(n->nif.ifpart); 9711556Srgrimes cmdputs("..."); 9721556Srgrimes break; 9731556Srgrimes case NWHILE: 9741556Srgrimes cmdputs("while "); 9751556Srgrimes goto until; 9761556Srgrimes case NUNTIL: 9771556Srgrimes cmdputs("until "); 9781556Srgrimesuntil: 9791556Srgrimes cmdtxt(n->nbinary.ch1); 9801556Srgrimes cmdputs("; do "); 9811556Srgrimes cmdtxt(n->nbinary.ch2); 9821556Srgrimes cmdputs("; done"); 9831556Srgrimes break; 9841556Srgrimes case NFOR: 9851556Srgrimes cmdputs("for "); 9861556Srgrimes cmdputs(n->nfor.var); 9871556Srgrimes cmdputs(" in ..."); 9881556Srgrimes break; 9891556Srgrimes case NCASE: 9901556Srgrimes cmdputs("case "); 9911556Srgrimes cmdputs(n->ncase.expr->narg.text); 9921556Srgrimes cmdputs(" in ..."); 9931556Srgrimes break; 9941556Srgrimes case NDEFUN: 9951556Srgrimes cmdputs(n->narg.text); 9961556Srgrimes cmdputs("() ..."); 9971556Srgrimes break; 9981556Srgrimes case NCMD: 9991556Srgrimes for (np = n->ncmd.args ; np ; np = np->narg.next) { 10001556Srgrimes cmdtxt(np); 10011556Srgrimes if (np->narg.next) 10021556Srgrimes cmdputs(" "); 10031556Srgrimes } 10041556Srgrimes for (np = n->ncmd.redirect ; np ; np = np->nfile.next) { 10051556Srgrimes cmdputs(" "); 10061556Srgrimes cmdtxt(np); 10071556Srgrimes } 10081556Srgrimes break; 10091556Srgrimes case NARG: 10101556Srgrimes cmdputs(n->narg.text); 10111556Srgrimes break; 10121556Srgrimes case NTO: 10131556Srgrimes p = ">"; i = 1; goto redir; 10141556Srgrimes case NAPPEND: 10151556Srgrimes p = ">>"; i = 1; goto redir; 10161556Srgrimes case NTOFD: 10171556Srgrimes p = ">&"; i = 1; goto redir; 10181556Srgrimes case NFROM: 10191556Srgrimes p = "<"; i = 0; goto redir; 10201556Srgrimes case NFROMFD: 10211556Srgrimes p = "<&"; i = 0; goto redir; 10221556Srgrimesredir: 10231556Srgrimes if (n->nfile.fd != i) { 10241556Srgrimes s[0] = n->nfile.fd + '0'; 10251556Srgrimes s[1] = '\0'; 10261556Srgrimes cmdputs(s); 10271556Srgrimes } 10281556Srgrimes cmdputs(p); 10291556Srgrimes if (n->type == NTOFD || n->type == NFROMFD) { 10301556Srgrimes s[0] = n->ndup.dupfd + '0'; 10311556Srgrimes s[1] = '\0'; 10321556Srgrimes cmdputs(s); 10331556Srgrimes } else { 10341556Srgrimes cmdtxt(n->nfile.fname); 10351556Srgrimes } 10361556Srgrimes break; 10371556Srgrimes case NHERE: 10381556Srgrimes case NXHERE: 10391556Srgrimes cmdputs("<<..."); 10401556Srgrimes break; 10411556Srgrimes default: 10421556Srgrimes cmdputs("???"); 10431556Srgrimes break; 10441556Srgrimes } 10451556Srgrimes} 10461556Srgrimes 10471556Srgrimes 10481556Srgrimes 10491556SrgrimesSTATIC void 10501556Srgrimescmdputs(s) 10511556Srgrimes char *s; 10521556Srgrimes { 10531556Srgrimes register char *p, *q; 10541556Srgrimes register char c; 10551556Srgrimes int subtype = 0; 10561556Srgrimes 10571556Srgrimes if (cmdnleft <= 0) 10581556Srgrimes return; 10591556Srgrimes p = s; 10601556Srgrimes q = cmdnextc; 10611556Srgrimes while ((c = *p++) != '\0') { 10621556Srgrimes if (c == CTLESC) 10631556Srgrimes *q++ = *p++; 10641556Srgrimes else if (c == CTLVAR) { 10651556Srgrimes *q++ = '$'; 10661556Srgrimes if (--cmdnleft > 0) 10671556Srgrimes *q++ = '{'; 10681556Srgrimes subtype = *p++; 10691556Srgrimes } else if (c == '=' && subtype != 0) { 10701556Srgrimes *q++ = "}-+?="[(subtype & VSTYPE) - VSNORMAL]; 10711556Srgrimes subtype = 0; 10721556Srgrimes } else if (c == CTLENDVAR) { 10731556Srgrimes *q++ = '}'; 10741556Srgrimes } else if (c == CTLBACKQ | c == CTLBACKQ+CTLQUOTE) 10751556Srgrimes cmdnleft++; /* ignore it */ 10761556Srgrimes else 10771556Srgrimes *q++ = c; 10781556Srgrimes if (--cmdnleft <= 0) { 10791556Srgrimes *q++ = '.'; 10801556Srgrimes *q++ = '.'; 10811556Srgrimes *q++ = '.'; 10821556Srgrimes break; 10831556Srgrimes } 10841556Srgrimes } 10851556Srgrimes cmdnextc = q; 10861556Srgrimes} 1087