/*- * Copyright (c) 1991, 1993 * The Regents of the University of California. All rights reserved. * Copyright (c) 1997-2005 * Herbert Xu . All rights reserved. * * This code is derived from software contributed to Berkeley by * Kenneth Almquist. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include #include #include #ifdef HAVE_PATHS_H #include #endif #include #include #ifdef BSD #include #include #include #endif #include #include "shell.h" #if JOBS #include #undef CEOF /* syntax.h redefines this */ #endif #include "redir.h" #include "show.h" #include "main.h" #include "parser.h" #include "nodes.h" #include "jobs.h" #include "options.h" #include "trap.h" #include "syntax.h" #include "input.h" #include "output.h" #include "memalloc.h" #include "error.h" #include "mystring.h" #include "system.h" /* mode flags for set_curjob */ #define CUR_DELETE 2 #define CUR_RUNNING 1 #define CUR_STOPPED 0 /* mode flags for dowait */ #define DOWAIT_NORMAL 0 #define DOWAIT_BLOCK 1 #define DOWAIT_WAITCMD 2 /* array of jobs */ static struct job *jobtab; /* size of array */ static unsigned njobs; /* pid of last background process */ pid_t backgndpid; #if JOBS /* pgrp of shell on invocation */ static int initialpgrp; /* control terminal */ static int ttyfd = -1; #endif /* current job */ static struct job *curjob; /* number of presumed living untracked jobs */ static int jobless; STATIC void set_curjob(struct job *, unsigned); STATIC int jobno(const struct job *); STATIC int sprint_status(char *, int, int); STATIC void freejob(struct job *); STATIC struct job *getjob(const char *, int); STATIC struct job *growjobtab(void); STATIC void forkchild(struct job *, union node *, int); STATIC void forkparent(struct job *, union node *, int, pid_t); STATIC int dowait(int, struct job *); #ifdef SYSV STATIC int onsigchild(void); #endif STATIC int waitproc(int, int *); STATIC char *commandtext(union node *); STATIC void cmdtxt(union node *); STATIC void cmdlist(union node *, int); STATIC void cmdputs(const char *); STATIC void showpipe(struct job *, struct output *); STATIC int getstatus(struct job *); #if JOBS static int restartjob(struct job *, int); static void xtcsetpgrp(int, pid_t); #endif STATIC void set_curjob(struct job *jp, unsigned mode) { struct job *jp1; struct job **jpp, **curp; /* first remove from list */ jpp = curp = &curjob; do { jp1 = *jpp; if (jp1 == jp) break; jpp = &jp1->prev_job; } while (1); *jpp = jp1->prev_job; /* Then re-insert in correct position */ jpp = curp; switch (mode) { default: #ifdef DEBUG abort(); #endif case CUR_DELETE: /* job being deleted */ break; case CUR_RUNNING: /* newly created job or backgrounded job, put after all stopped jobs. */ do { jp1 = *jpp; if (!JOBS || !jp1 || jp1->state != JOBSTOPPED) break; jpp = &jp1->prev_job; } while (1); /* FALLTHROUGH */ #if JOBS case CUR_STOPPED: #endif /* newly stopped job - becomes curjob */ jp->prev_job = *jpp; *jpp = jp; break; } } #if JOBS /* * Turn job control on and off. * * Note: This code assumes that the third arg to ioctl is a character * pointer, which is true on Berkeley systems but not System V. Since * System V doesn't have job control yet, this isn't a problem now. * * Called with interrupts off. */ int jobctl; void setjobctl(int on) { int fd; int pgrp; if (on == jobctl || rootshell == 0) return; if (on) { int ofd; ofd = fd = open(_PATH_TTY, O_RDWR); if (fd < 0) { fd += 3; while (!isatty(fd)) if (--fd < 0) goto out; } fd = savefd(fd, ofd); do { /* while we are in the background */ if ((pgrp = tcgetpgrp(fd)) < 0) { out: sh_warnx("can't access tty; job control turned off"); mflag = on = 0; goto close; } if (pgrp == getpgrp()) break; killpg(0, SIGTTIN); } while (1); initialpgrp = pgrp; setsignal(SIGTSTP); setsignal(SIGTTOU); setsignal(SIGTTIN); pgrp = rootpid; setpgid(0, pgrp); xtcsetpgrp(fd, pgrp); } else { /* turning job control off */ fd = ttyfd; pgrp = initialpgrp; xtcsetpgrp(fd, pgrp); setpgid(0, pgrp); setsignal(SIGTSTP); setsignal(SIGTTOU); setsignal(SIGTTIN); close: close(fd); fd = -1; } ttyfd = fd; jobctl = on; } #endif int killcmd(argc, argv) int argc; char **argv; { extern char *signal_names[]; int signo = -1; int list = 0; int i; pid_t pid; struct job *jp; if (argc <= 1) { usage: sh_error( "Usage: kill [-s sigspec | -signum | -sigspec] [pid | job]... or\n" "kill -l [exitstatus]" ); } if (**++argv == '-') { signo = decode_signal(*argv + 1, 1); if (signo < 0) { int c; while ((c = nextopt("ls:")) != '\0') switch (c) { default: #ifdef DEBUG abort(); #endif case 'l': list = 1; break; case 's': signo = decode_signal(optionarg, 1); if (signo < 0) { sh_error( "invalid signal number or name: %s", optionarg ); } break; } argv = argptr; } else argv++; } if (!list && signo < 0) signo = SIGTERM; if ((signo < 0 || !*argv) ^ list) { goto usage; } if (list) { struct output *out; out = out1; if (!*argv) { outstr("0\n", out); for (i = 1; i < NSIG; i++) { outfmt(out, snlfmt, signal_names[i]); } return 0; } signo = number(*argv); if (signo > 128) signo -= 128; if (0 < signo && signo < NSIG) outfmt(out, snlfmt, signal_names[signo]); else sh_error("invalid signal number or exit status: %s", *argv); return 0; } i = 0; do { if (**argv == '%') { jp = getjob(*argv, 0); pid = -jp->ps[0].pid; } else pid = **argv == '-' ? -number(*argv + 1) : number(*argv); if (kill(pid, signo) != 0) { sh_warnx("%s\n", strerror(errno)); i = 1; } } while (*++argv); return i; } STATIC int jobno(const struct job *jp) { return jp - jobtab + 1; } #if JOBS int fgcmd(int argc, char **argv) { struct job *jp; struct output *out; int mode; int retval; mode = (**argv == 'f') ? FORK_FG : FORK_BG; nextopt(nullstr); argv = argptr; out = out1; do { jp = getjob(*argv, 1); if (mode == FORK_BG) { set_curjob(jp, CUR_RUNNING); outfmt(out, "[%d] ", jobno(jp)); } outstr(jp->ps->cmd, out); showpipe(jp, out); retval = restartjob(jp, mode); } while (*argv && *++argv); return retval; } int bgcmd(int argc, char **argv) #ifdef HAVE_ALIAS_ATTRIBUTE __attribute__((__alias__("fgcmd"))); #else { return fgcmd(argc, argv); } #endif STATIC int restartjob(struct job *jp, int mode) { struct procstat *ps; int i; int status; pid_t pgid; INTOFF; if (jp->state == JOBDONE) goto out; jp->state = JOBRUNNING; pgid = jp->ps->pid; if (mode == FORK_FG) xtcsetpgrp(ttyfd, pgid); killpg(pgid, SIGCONT); ps = jp->ps; i = jp->nprocs; do { if (WIFSTOPPED(ps->status)) { ps->status = -1; } } while (ps++, --i); out: status = (mode == FORK_FG) ? waitforjob(jp) : 0; INTON; return status; } #endif STATIC int sprint_status(char *s, int status, int sigonly) { int col; int st; col = 0; st = WEXITSTATUS(status); if (!WIFEXITED(status)) { #if JOBS st = WSTOPSIG(status); if (!WIFSTOPPED(status)) #endif st = WTERMSIG(status); if (sigonly) { if (st == SIGINT || st == SIGPIPE) goto out; #if JOBS if (WIFSTOPPED(status)) goto out; #endif } col = fmtstr(s, 32, strsignal(st)); #ifdef WCOREDUMP if (WCOREDUMP(status)) { col += fmtstr(s + col, 16, " (core dumped)"); } #endif } else if (!sigonly) { if (st) col = fmtstr(s, 16, "Done(%d)", st); else col = fmtstr(s, 16, "Done"); } out: return col; } static void showjob(struct output *out, struct job *jp, int mode) { struct procstat *ps; struct procstat *psend; int col; int indent; char s[80]; ps = jp->ps; if (mode & SHOW_PGID) { /* just output process (group) id of pipeline */ outfmt(out, "%d\n", ps->pid); return; } col = fmtstr(s, 16, "[%d] ", jobno(jp)); indent = col; if (jp == curjob) s[col - 2] = '+'; else if (curjob && jp == curjob->prev_job) s[col - 2] = '-'; if (mode & SHOW_PID) col += fmtstr(s + col, 16, "%d ", ps->pid); psend = ps + jp->nprocs; if (jp->state == JOBRUNNING) { scopy("Running", s + col); col += strlen("Running"); } else { int status = psend[-1].status; #if JOBS if (jp->state == JOBSTOPPED) status = jp->stopstatus; #endif col += sprint_status(s + col, status, 0); } goto start; do { /* for each process */ col = fmtstr(s, 48, " |\n%*c%d ", indent, ' ', ps->pid) - 3; start: outfmt( out, "%s%*c%s", s, 33 - col >= 0 ? 33 - col : 0, ' ', ps->cmd ); if (!(mode & SHOW_PID)) { showpipe(jp, out); break; } if (++ps == psend) { outcslow('\n', out); break; } } while (1); jp->changed = 0; if (jp->state == JOBDONE) { TRACE(("showjob: freeing job %d\n", jobno(jp))); freejob(jp); } } int jobscmd(int argc, char **argv) { int mode, m; struct output *out; mode = 0; while ((m = nextopt("lp"))) if (m == 'l') mode = SHOW_PID; else mode = SHOW_PGID; out = out1; argv = argptr; if (*argv) do showjob(out, getjob(*argv,0), mode); while (*++argv); else showjobs(out, mode); return 0; } /* * Print a list of jobs. If "change" is nonzero, only print jobs whose * statuses have changed since the last call to showjobs. */ void showjobs(struct output *out, int mode) { struct job *jp; TRACE(("showjobs(%x) called\n", mode)); /* If not even one one job changed, there is nothing to do */ while (dowait(DOWAIT_NORMAL, NULL) > 0) continue; for (jp = curjob; jp; jp = jp->prev_job) { if (!(mode & SHOW_CHANGED) || jp->changed) showjob(out, jp, mode); } } /* * Mark a job structure as unused. */ STATIC void freejob(struct job *jp) { struct procstat *ps; int i; INTOFF; for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) { if (ps->cmd != nullstr) ckfree(ps->cmd); } if (jp->ps != &jp->ps0) ckfree(jp->ps); jp->used = 0; set_curjob(jp, CUR_DELETE); INTON; } int waitcmd(int argc, char **argv) { struct job *job; int retval; struct job *jp; nextopt(nullstr); retval = 0; argv = argptr; if (!*argv) { /* wait for all jobs */ for (;;) { jp = curjob; while (1) { if (!jp) { /* no running procs */ goto out; } if (jp->state == JOBRUNNING) break; jp->waited = 1; jp = jp->prev_job; } if (dowait(DOWAIT_WAITCMD, 0) <= 0) goto sigout; } } retval = 127; do { if (**argv != '%') { pid_t pid = number(*argv); job = curjob; goto start; do { if (job->ps[job->nprocs - 1].pid == pid) break; job = job->prev_job; start: if (!job) goto repeat; } while (1); } else job = getjob(*argv, 0); /* loop until process terminated or stopped */ while (job->state == JOBRUNNING) if (dowait(DOWAIT_WAITCMD, 0) <= 0) goto sigout; job->waited = 1; retval = getstatus(job); repeat: ; } while (*++argv); out: return retval; sigout: retval = 128 + pendingsigs; goto out; } /* * Convert a job name to a job structure. */ STATIC struct job * getjob(const char *name, int getctl) { struct job *jp; struct job *found; const char *err_msg = "No such job: %s"; unsigned num; int c; const char *p; char *(*match)(const char *, const char *); jp = curjob; p = name; if (!p) goto currentjob; if (*p != '%') goto err; c = *++p; if (!c) goto currentjob; if (!p[1]) { if (c == '+' || c == '%') { currentjob: err_msg = "No current job"; goto check; } else if (c == '-') { if (jp) jp = jp->prev_job; err_msg = "No previous job"; check: if (!jp) goto err; goto gotit; } } if (is_number(p)) { num = atoi(p); if (num <= njobs) { jp = jobtab + num - 1; if (jp->used) goto gotit; goto err; } } match = prefix; if (*p == '?') { match = strstr; p++; } found = 0; while (1) { if (!jp) goto err; if (match(jp->ps[0].cmd, p)) { if (found) goto err; found = jp; err_msg = "%s: ambiguous"; } jp = jp->prev_job; } gotit: #if JOBS err_msg = "job %s not created under job control"; if (getctl && jp->jobctl == 0) goto err; #endif return jp; err: sh_error(err_msg, name); } /* * Return a new job structure. * Called with interrupts off. */ struct job * makejob(union node *node, int nprocs) { int i; struct job *jp; for (i = njobs, jp = jobtab ; ; jp++) { if (--i < 0) { jp = growjobtab(); break; } if (jp->used == 0) break; if (jp->state != JOBDONE || !jp->waited) continue; if (jobctl) continue; freejob(jp); break; } memset(jp, 0, sizeof(*jp)); #if JOBS if (jobctl) jp->jobctl = 1; #endif jp->prev_job = curjob; curjob = jp; jp->used = 1; jp->ps = &jp->ps0; if (nprocs > 1) { jp->ps = ckmalloc(nprocs * sizeof (struct procstat)); } TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long)node, nprocs, jobno(jp))); return jp; } STATIC struct job * growjobtab(void) { size_t len; ptrdiff_t offset; struct job *jp, *jq; len = njobs * sizeof(*jp); jq = jobtab; jp = ckrealloc(jq, len + 4 * sizeof(*jp)); offset = (char *)jp - (char *)jq; if (offset) { /* Relocate pointers */ size_t l = len; jq = (struct job *)((char *)jq + l); while (l) { l -= sizeof(*jp); jq--; #define joff(p) ((struct job *)((char *)(p) + l)) #define jmove(p) (p) = (void *)((char *)(p) + offset) if (likely(joff(jp)->ps == &jq->ps0)) jmove(joff(jp)->ps); if (joff(jp)->prev_job) jmove(joff(jp)->prev_job); } if (curjob) jmove(curjob); #undef joff #undef jmove } njobs += 4; jobtab = jp; jp = (struct job *)((char *)jp + len); jq = jp + 3; do { jq->used = 0; } while (--jq >= jp); return jp; } /* * Fork off a subshell. If we are doing job control, give the subshell its * own process group. Jp is a job structure that the job is to be added to. * N is the command that will be evaluated by the child. Both jp and n may * be NULL. The mode parameter can be one of the following: * FORK_FG - Fork off a foreground process. * FORK_BG - Fork off a background process. * FORK_NOJOB - Like FORK_FG, but don't give the process its own * process group even if job control is on. * * When job control is turned off, background processes have their standard * input redirected to /dev/null (except for the second and later processes * in a pipeline). * * Called with interrupts off. */ STATIC inline void forkchild(struct job *jp, union node *n, int mode) { int oldlvl; TRACE(("Child shell %d\n", getpid())); oldlvl = shlvl; shlvl++; closescript(); clear_traps(); #if JOBS /* do job control only in root shell */ jobctl = 0; if (mode != FORK_NOJOB && jp->jobctl && !oldlvl) { pid_t pgrp; if (jp->nprocs == 0) pgrp = getpid(); else pgrp = jp->ps[0].pid; /* This can fail because we are doing it in the parent also */ (void)setpgid(0, pgrp); if (mode == FORK_FG) xtcsetpgrp(ttyfd, pgrp); setsignal(SIGTSTP); setsignal(SIGTTOU); } else #endif if (mode == FORK_BG) { ignoresig(SIGINT); ignoresig(SIGQUIT); if (jp->nprocs == 0) { close(0); if (open(_PATH_DEVNULL, O_RDONLY) != 0) sh_error("Can't open %s", _PATH_DEVNULL); } } if (!oldlvl && iflag) { setsignal(SIGINT); setsignal(SIGQUIT); setsignal(SIGTERM); } for (jp = curjob; jp; jp = jp->prev_job) freejob(jp); jobless = 0; } STATIC inline void forkparent(struct job *jp, union node *n, int mode, pid_t pid) { TRACE(("In parent shell: child = %d\n", pid)); if (!jp) { while (jobless && dowait(DOWAIT_NORMAL, 0) > 0); jobless++; return; } #if JOBS if (mode != FORK_NOJOB && jp->jobctl) { int pgrp; if (jp->nprocs == 0) pgrp = pid; else pgrp = jp->ps[0].pid; /* This can fail because we are doing it in the child also */ (void)setpgid(pid, pgrp); } #endif if (mode == FORK_BG) { backgndpid = pid; /* set $! */ set_curjob(jp, CUR_RUNNING); } if (jp) { struct procstat *ps = &jp->ps[jp->nprocs++]; ps->pid = pid; ps->status = -1; ps->cmd = nullstr; if (jobctl && n) ps->cmd = commandtext(n); } } int forkshell(struct job *jp, union node *n, int mode) { int pid; TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode)); pid = fork(); if (pid < 0) { TRACE(("Fork failed, errno=%d", errno)); if (jp) freejob(jp); sh_error("Cannot fork"); } if (pid == 0) forkchild(jp, n, mode); else forkparent(jp, n, mode, pid); return pid; } /* * Wait for job to finish. * * Under job control we have the problem that while a child process is * running interrupts generated by the user are sent to the child but not * to the shell. This means that an infinite loop started by an inter- * active user may be hard to kill. With job control turned off, an * interactive user may place an interactive program inside a loop. If * the interactive program catches interrupts, the user doesn't want * these interrupts to also abort the loop. The approach we take here * is to have the shell ignore interrupt signals while waiting for a * forground process to terminate, and then send itself an interrupt * signal if the child process was terminated by an interrupt signal. * Unfortunately, some programs want to do a bit of cleanup and then * exit on interrupt; unless these processes terminate themselves by * sending a signal to themselves (instead of calling exit) they will * confuse this approach. * * Called with interrupts off. */ int waitforjob(struct job *jp) { int st; TRACE(("waitforjob(%%%d) called\n", jobno(jp))); while (jp->state == JOBRUNNING) { dowait(DOWAIT_BLOCK, jp); } st = getstatus(jp); #if JOBS if (jp->jobctl) { xtcsetpgrp(ttyfd, rootpid); /* * This is truly gross. * If we're doing job control, then we did a TIOCSPGRP which * caused us (the shell) to no longer be in the controlling * session -- so we wouldn't have seen any ^C/SIGINT. So, we * intuit from the subprocess exit status whether a SIGINT * occurred, and if so interrupt ourselves. Yuck. - mycroft */ if (jp->sigint) raise(SIGINT); } #endif if (! JOBS || jp->state == JOBDONE) freejob(jp); return st; } /* * Wait for a process to terminate. */ STATIC int dowait(int block, struct job *job) { int pid; int status; struct job *jp; struct job *thisjob = NULL; int state; INTOFF; TRACE(("dowait(%d) called\n", block)); pid = waitproc(block, &status); TRACE(("wait returns pid %d, status=%d\n", pid, status)); if (pid <= 0) goto out; for (jp = curjob; jp; jp = jp->prev_job) { struct procstat *sp; struct procstat *spend; if (jp->state == JOBDONE) continue; state = JOBDONE; spend = jp->ps + jp->nprocs; sp = jp->ps; do { if (sp->pid == pid) { TRACE(("Job %d: changing status of proc %d from 0x%x to 0x%x\n", jobno(jp), pid, sp->status, status)); sp->status = status; thisjob = jp; } if (sp->status == -1) state = JOBRUNNING; #if JOBS if (state == JOBRUNNING) continue; if (WIFSTOPPED(sp->status)) { jp->stopstatus = sp->status; state = JOBSTOPPED; } #endif } while (++sp < spend); if (thisjob) goto gotjob; } if (!JOBS || !WIFSTOPPED(status)) jobless--; goto out; gotjob: if (state != JOBRUNNING) { thisjob->changed = 1; if (thisjob->state != state) { TRACE(("Job %d: changing state from %d to %d\n", jobno(thisjob), thisjob->state, state)); thisjob->state = state; #if JOBS if (state == JOBSTOPPED) { set_curjob(thisjob, CUR_STOPPED); } #endif } } out: INTON; if (thisjob && thisjob == job) { char s[48 + 1]; int len; len = sprint_status(s, status, 1); if (len) { s[len] = '\n'; s[len + 1] = 0; outstr(s, out2); } } return pid; } /* * Do a wait system call. If job control is compiled in, we accept * stopped processes. If block is zero, we return a value of zero * rather than blocking. * * System V doesn't have a non-blocking wait system call. It does * have a SIGCLD signal that is sent to a process when one of it's * children dies. The obvious way to use SIGCLD would be to install * a handler for SIGCLD which simply bumped a counter when a SIGCLD * was received, and have waitproc bump another counter when it got * the status of a process. Waitproc would then know that a wait * system call would not block if the two counters were different. * This approach doesn't work because if a process has children that * have not been waited for, System V will send it a SIGCLD when it * installs a signal handler for SIGCLD. What this means is that when * a child exits, the shell will be sent SIGCLD signals continuously * until is runs out of stack space, unless it does a wait call before * restoring the signal handler. The code below takes advantage of * this (mis)feature by installing a signal handler for SIGCLD and * then checking to see whether it was called. If there are any * children to be waited for, it will be. * * If neither SYSV nor BSD is defined, we don't implement nonblocking * waits at all. In this case, the user will not be informed when * a background process until the next time she runs a real program * (as opposed to running a builtin command or just typing return), * and the jobs command may give out of date information. */ #ifdef SYSV STATIC int gotsigchild; STATIC int onsigchild() { gotsigchild = 1; } #endif STATIC int waitproc(int block, int *status) { sigset_t mask, oldmask; int flags = block == DOWAIT_BLOCK ? 0 : WNOHANG; int err; #if JOBS if (jobctl) flags |= WUNTRACED; #endif do { gotsigchld = 0; err = wait3(status, flags, NULL); if (err || !block) break; block = 0; sigfillset(&mask); sigprocmask(SIG_SETMASK, &mask, &oldmask); while (!gotsigchld && !pendingsigs) sigsuspend(&oldmask); sigclearmask(); } while (gotsigchld); return err; } /* * return 1 if there are stopped jobs, otherwise 0 */ int job_warning; int stoppedjobs(void) { struct job *jp; int retval; retval = 0; if (job_warning) goto out; jp = curjob; if (jp && jp->state == JOBSTOPPED) { out2str("You have stopped jobs.\n"); job_warning = 2; retval++; } out: return retval; } /* * Return a string identifying a command (to be printed by the * jobs command). */ STATIC char *cmdnextc; STATIC char * commandtext(union node *n) { char *name; STARTSTACKSTR(cmdnextc); cmdtxt(n); name = stackblock(); TRACE(("commandtext: name %p, end %p\n", name, cmdnextc)); return savestr(name); } STATIC void cmdtxt(union node *n) { union node *np; struct nodelist *lp; const char *p; char s[2]; if (!n) return; switch (n->type) { default: #if DEBUG abort(); #endif case NPIPE: lp = n->npipe.cmdlist; for (;;) { cmdtxt(lp->n); lp = lp->next; if (!lp) break; cmdputs(" | "); } break; case NSEMI: p = "; "; goto binop; case NAND: p = " && "; goto binop; case NOR: p = " || "; binop: cmdtxt(n->nbinary.ch1); cmdputs(p); n = n->nbinary.ch2; goto donode; case NREDIR: case NBACKGND: n = n->nredir.n; goto donode; case NNOT: cmdputs("!"); n = n->nnot.com; donode: cmdtxt(n); break; case NIF: cmdputs("if "); cmdtxt(n->nif.test); cmdputs("; then "); if (n->nif.elsepart) { cmdtxt(n->nif.ifpart); cmdputs("; else "); n = n->nif.elsepart; } else { n = n->nif.ifpart; } p = "; fi"; goto dotail; case NSUBSHELL: cmdputs("("); n = n->nredir.n; p = ")"; goto dotail; case NWHILE: p = "while "; goto until; case NUNTIL: p = "until "; until: cmdputs(p); cmdtxt(n->nbinary.ch1); n = n->nbinary.ch2; p = "; done"; dodo: cmdputs("; do "); dotail: cmdtxt(n); goto dotail2; case NFOR: cmdputs("for "); cmdputs(n->nfor.var); cmdputs(" in "); cmdlist(n->nfor.args, 1); n = n->nfor.body; p = "; done"; goto dodo; case NDEFUN: cmdputs(n->ndefun.text); p = "() { ... }"; goto dotail2; case NCMD: cmdlist(n->ncmd.args, 1); cmdlist(n->ncmd.redirect, 0); break; case NARG: p = n->narg.text; dotail2: cmdputs(p); break; case NHERE: case NXHERE: p = "<<..."; goto dotail2; case NCASE: cmdputs("case "); cmdputs(n->ncase.expr->narg.text); cmdputs(" in "); for (np = n->ncase.cases; np; np = np->nclist.next) { cmdtxt(np->nclist.pattern); cmdputs(") "); cmdtxt(np->nclist.body); cmdputs(";; "); } p = "esac"; goto dotail2; case NTO: p = ">"; goto redir; case NCLOBBER: p = ">|"; goto redir; case NAPPEND: p = ">>"; goto redir; case NTOFD: p = ">&"; goto redir; case NFROM: p = "<"; goto redir; case NFROMFD: p = "<&"; goto redir; case NFROMTO: p = "<>"; redir: s[0] = n->nfile.fd + '0'; s[1] = '\0'; cmdputs(s); cmdputs(p); if (n->type == NTOFD || n->type == NFROMFD) { s[0] = n->ndup.dupfd + '0'; p = s; goto dotail2; } else { n = n->nfile.fname; goto donode; } } } STATIC void cmdlist(union node *np, int sep) { for (; np; np = np->narg.next) { if (!sep) cmdputs(spcstr); cmdtxt(np); if (sep && np->narg.next) cmdputs(spcstr); } } STATIC void cmdputs(const char *s) { const char *p, *str; char cc[2] = " "; char *nextc; signed char c; int subtype = 0; int quoted = 0; static const char vstype[VSTYPE + 1][4] = { "", "}", "-", "+", "?", "=", "%", "%%", "#", "##", }; nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc); p = s; while ((c = *p++) != 0) { str = 0; switch (c) { case CTLESC: c = *p++; break; case CTLVAR: subtype = *p++; if ((subtype & VSTYPE) == VSLENGTH) str = "${#"; else str = "${"; goto dostr; case CTLENDVAR: str = "\"}" + !(quoted & 1); quoted >>= 1; subtype = 0; goto dostr; case CTLBACKQ: str = "$(...)"; goto dostr; case CTLARI: str = "$(("; goto dostr; case CTLENDARI: str = "))"; goto dostr; case CTLQUOTEMARK: quoted ^= 1; c = '"'; break; case '=': if (subtype == 0) break; if ((subtype & VSTYPE) != VSNORMAL) quoted <<= 1; str = vstype[subtype & VSTYPE]; if (subtype & VSNUL) c = ':'; else goto checkstr; break; case '\'': case '\\': case '"': case '$': /* These can only happen inside quotes */ cc[0] = c; str = cc; c = '\\'; break; default: break; } USTPUTC(c, nextc); checkstr: if (!str) continue; dostr: while ((c = *str++)) { USTPUTC(c, nextc); } } if (quoted & 1) { USTPUTC('"', nextc); } *nextc = 0; cmdnextc = nextc; } STATIC void showpipe(struct job *jp, struct output *out) { struct procstat *sp; struct procstat *spend; spend = jp->ps + jp->nprocs; for (sp = jp->ps + 1; sp < spend; sp++) outfmt(out, " | %s", sp->cmd); outcslow('\n', out); flushall(); } #if JOBS STATIC void xtcsetpgrp(int fd, pid_t pgrp) { if (tcsetpgrp(fd, pgrp)) sh_error("Cannot set tty process group (%s)", strerror(errno)); } #endif STATIC int getstatus(struct job *job) { int status; int retval; status = job->ps[job->nprocs - 1].status; retval = WEXITSTATUS(status); if (!WIFEXITED(status)) { #if JOBS retval = WSTOPSIG(status); if (!WIFSTOPPED(status)) #endif { /* XXX: limits number of signals */ retval = WTERMSIG(status); #if JOBS if (retval == SIGINT) job->sigint = 1; #endif } retval += 128; } TRACE(("getstatus: job %d, nproc %d, status %x, retval %x\n", jobno(job), job->nprocs, status, retval)); return retval; }