diff options
Diffstat (limited to 'bin/cash/jobs.c')
| -rw-r--r-- | bin/cash/jobs.c | 1552 |
1 files changed, 0 insertions, 1552 deletions
diff --git a/bin/cash/jobs.c b/bin/cash/jobs.c deleted file mode 100644 index 88703edd..00000000 --- a/bin/cash/jobs.c +++ /dev/null @@ -1,1552 +0,0 @@ -/*- - * Copyright (c) 1991, 1993 - * The Regents of the University of California. 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. - */ - -#ifndef lint -#if 0 -static char sccsid[] = "@(#)jobs.c 8.5 (Berkeley) 5/4/95"; -#endif -#endif /* not lint */ -#include <sys/cdefs.h> -__FBSDID("$FreeBSD: releng/12.0/bin/sh/jobs.c 328818 2018-02-02 22:53:58Z jilles $"); - -#include <sys/ioctl.h> -#include <sys/param.h> -#include <sys/resource.h> -#include <sys/time.h> -#include <sys/wait.h> -#include <errno.h> -#include <fcntl.h> -#include <paths.h> -#include <signal.h> -#include <stddef.h> -#include <stdlib.h> -#include <unistd.h> - -#include "shell.h" -#if JOBS -#include <termios.h> -#undef CEOF /* syntax.h redefines this */ -#endif -#include "redir.h" -#include "exec.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 "var.h" -#include "builtins.h" - - -/* - * A job structure contains information about a job. A job is either a - * single process or a set of processes contained in a pipeline. In the - * latter case, pidlist will be non-NULL, and will point to a -1 terminated - * array of pids. - */ - -struct procstat { - pid_t pid; /* process id */ - int status; /* status flags (defined above) */ - char *cmd; /* text of command being run */ -}; - - -/* states */ -#define JOBSTOPPED 1 /* all procs are stopped */ -#define JOBDONE 2 /* all procs are completed */ - - -struct job { - struct procstat ps0; /* status of process */ - struct procstat *ps; /* status or processes when more than one */ - short nprocs; /* number of processes */ - pid_t pgrp; /* process group of this job */ - char state; /* true if job is finished */ - char used; /* true if this entry is in used */ - char changed; /* true if status has changed */ - char foreground; /* true if running in the foreground */ - char remembered; /* true if $! referenced */ -#if JOBS - char jobctl; /* job running under job control */ - struct job *next; /* job used after this one */ -#endif -}; - - -static struct job *jobtab; /* array of jobs */ -static int njobs; /* size of array */ -static pid_t backgndpid = -1; /* pid of last background process */ -static struct job *bgjob = NULL; /* last background process */ -#if JOBS -static struct job *jobmru; /* most recently used job list */ -static pid_t initialpgrp; /* pgrp of shell on invocation */ -#endif -static int ttyfd = -1; - -/* mode flags for dowait */ -#define DOWAIT_BLOCK 0x1 /* wait until a child exits */ -#define DOWAIT_SIG 0x2 /* if DOWAIT_BLOCK, abort on signal */ -#define DOWAIT_SIG_TRAP 0x4 /* if DOWAIT_SIG, abort on trapped signal only */ - -#if JOBS -static void restartjob(struct job *); -#endif -static void freejob(struct job *); -static int waitcmdloop(struct job *); -static struct job *getjob_nonotfound(const char *); -static struct job *getjob(const char *); -pid_t killjob(const char *, int); -static pid_t dowait(int, struct job *); -static void checkzombies(void); -static void cmdtxt(union node *); -static void cmdputs(const char *); -#if JOBS -static void setcurjob(struct job *); -static void deljob(struct job *); -static struct job *getcurjob(struct job *); -#endif -static void printjobcmd(struct job *); -static void showjob(struct job *, int); - - -/* - * Turn job control on and off. - */ - -static int jobctl; - -#if JOBS -static void -jobctl_notty(void) -{ - if (ttyfd >= 0) { - close(ttyfd); - ttyfd = -1; - } - if (!iflag) { - setsignal(SIGTSTP); - setsignal(SIGTTOU); - setsignal(SIGTTIN); - jobctl = 1; - return; - } - out2fmt_flush("sh: can't access tty; job control turned off\n"); - mflag = 0; -} - -void -setjobctl(int on) -{ - int i; - - if (on == jobctl || rootshell == 0) - return; - if (on) { - if (ttyfd != -1) - close(ttyfd); - if ((ttyfd = open(_PATH_TTY, O_RDWR | O_CLOEXEC)) < 0) { - i = 0; - while (i <= 2 && !isatty(i)) - i++; - if (i > 2 || - (ttyfd = fcntl(i, F_DUPFD_CLOEXEC, 10)) < 0) { - jobctl_notty(); - return; - } - } - if (ttyfd < 10) { - /* - * Keep our TTY file descriptor out of the way of - * the user's redirections. - */ - if ((i = fcntl(ttyfd, F_DUPFD_CLOEXEC, 10)) < 0) { - jobctl_notty(); - return; - } - close(ttyfd); - ttyfd = i; - } - do { /* while we are in the background */ - initialpgrp = tcgetpgrp(ttyfd); - if (initialpgrp < 0) { - jobctl_notty(); - return; - } - if (initialpgrp != getpgrp()) { - if (!iflag) { - initialpgrp = -1; - jobctl_notty(); - return; - } - kill(0, SIGTTIN); - continue; - } - } while (0); - setsignal(SIGTSTP); - setsignal(SIGTTOU); - setsignal(SIGTTIN); - setpgid(0, rootpid); - tcsetpgrp(ttyfd, rootpid); - } else { /* turning job control off */ - setpgid(0, initialpgrp); - if (ttyfd >= 0) { - tcsetpgrp(ttyfd, initialpgrp); - close(ttyfd); - ttyfd = -1; - } - setsignal(SIGTSTP); - setsignal(SIGTTOU); - setsignal(SIGTTIN); - } - jobctl = on; -} -#endif - - -#if JOBS -int -fgcmd(int argc __unused, char **argv __unused) -{ - struct job *jp; - pid_t pgrp; - int status; - - nextopt(""); - jp = getjob(*argptr); - if (jp->jobctl == 0) - error("job not created under job control"); - printjobcmd(jp); - flushout(&output); - pgrp = jp->ps[0].pid; - if (ttyfd >= 0) - tcsetpgrp(ttyfd, pgrp); - restartjob(jp); - jp->foreground = 1; - INTOFF; - status = waitforjob(jp, (int *)NULL); - INTON; - return status; -} - - -int -bgcmd(int argc __unused, char **argv __unused) -{ - struct job *jp; - - nextopt(""); - do { - jp = getjob(*argptr); - if (jp->jobctl == 0) - error("job not created under job control"); - if (jp->state == JOBDONE) - continue; - restartjob(jp); - jp->foreground = 0; - out1fmt("[%td] ", jp - jobtab + 1); - printjobcmd(jp); - } while (*argptr != NULL && *++argptr != NULL); - return 0; -} - - -static void -restartjob(struct job *jp) -{ - struct procstat *ps; - int i; - - if (jp->state == JOBDONE) - return; - setcurjob(jp); - INTOFF; - kill(-jp->ps[0].pid, SIGCONT); - for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { - if (WIFSTOPPED(ps->status)) { - ps->status = -1; - jp->state = 0; - } - } - INTON; -} -#endif - - -int -jobscmd(int argc __unused, char *argv[] __unused) -{ - char *id; - int ch, mode; - - mode = SHOWJOBS_DEFAULT; - while ((ch = nextopt("lps")) != '\0') { - switch (ch) { - case 'l': - mode = SHOWJOBS_VERBOSE; - break; - case 'p': - mode = SHOWJOBS_PGIDS; - break; - case 's': - mode = SHOWJOBS_PIDS; - break; - } - } - - if (*argptr == NULL) - showjobs(0, mode); - else - while ((id = *argptr++) != NULL) - showjob(getjob(id), mode); - - return (0); -} - -static void -printjobcmd(struct job *jp) -{ - struct procstat *ps; - int i; - - for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { - out1str(ps->cmd); - if (i > 0) - out1str(" | "); - } - out1c('\n'); -} - -static void -showjob(struct job *jp, int mode) -{ - char s[64]; - char statebuf[16]; - const char *statestr, *coredump; - struct procstat *ps; - struct job *j; - int col, curr, i, jobno, prev, procno, status; - char c; - - procno = (mode == SHOWJOBS_PGIDS) ? 1 : jp->nprocs; - jobno = jp - jobtab + 1; - curr = prev = 0; -#if JOBS - if ((j = getcurjob(NULL)) != NULL) { - curr = j - jobtab + 1; - if ((j = getcurjob(j)) != NULL) - prev = j - jobtab + 1; - } -#endif - coredump = ""; - status = jp->ps[jp->nprocs - 1].status; - if (jp->state == 0) { - statestr = "Running"; -#if JOBS - } else if (jp->state == JOBSTOPPED) { - ps = jp->ps + jp->nprocs - 1; - while (!WIFSTOPPED(ps->status) && ps > jp->ps) - ps--; - if (WIFSTOPPED(ps->status)) - i = WSTOPSIG(ps->status); - else - i = -1; - statestr = strsignal(i); - if (statestr == NULL) - statestr = "Suspended"; -#endif - } else if (WIFEXITED(status)) { - if (WEXITSTATUS(status) == 0) - statestr = "Done"; - else { - fmtstr(statebuf, sizeof(statebuf), "Done(%d)", - WEXITSTATUS(status)); - statestr = statebuf; - } - } else { - i = WTERMSIG(status); - statestr = strsignal(i); - if (statestr == NULL) - statestr = "Unknown signal"; - if (WCOREDUMP(status)) - coredump = " (core dumped)"; - } - - for (ps = jp->ps ; procno > 0 ; ps++, procno--) { /* for each process */ - if (mode == SHOWJOBS_PIDS || mode == SHOWJOBS_PGIDS) { - out1fmt("%d\n", (int)ps->pid); - continue; - } - if (mode != SHOWJOBS_VERBOSE && ps != jp->ps) - continue; - if (jobno == curr && ps == jp->ps) - c = '+'; - else if (jobno == prev && ps == jp->ps) - c = '-'; - else - c = ' '; - if (ps == jp->ps) - fmtstr(s, 64, "[%d] %c ", jobno, c); - else - fmtstr(s, 64, " %c ", c); - out1str(s); - col = strlen(s); - if (mode == SHOWJOBS_VERBOSE) { - fmtstr(s, 64, "%d ", (int)ps->pid); - out1str(s); - col += strlen(s); - } - if (ps == jp->ps) { - out1str(statestr); - out1str(coredump); - col += strlen(statestr) + strlen(coredump); - } - do { - out1c(' '); - col++; - } while (col < 30); - if (mode == SHOWJOBS_VERBOSE) { - out1str(ps->cmd); - out1c('\n'); - } else - printjobcmd(jp); - } -} - -/* - * Print a list of jobs. If "change" is nonzero, only print jobs whose - * statuses have changed since the last call to showjobs. - * - * If the shell is interrupted in the process of creating a job, the - * result may be a job structure containing zero processes. Such structures - * will be freed here. - */ - -void -showjobs(int change, int mode) -{ - int jobno; - struct job *jp; - - TRACE(("showjobs(%d) called\n", change)); - checkzombies(); - for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) { - if (! jp->used) - continue; - if (jp->nprocs == 0) { - freejob(jp); - continue; - } - if (change && ! jp->changed) - continue; - showjob(jp, mode); - if (mode == SHOWJOBS_DEFAULT || mode == SHOWJOBS_VERBOSE) { - jp->changed = 0; - /* Hack: discard jobs for which $! has not been - * referenced in interactive mode when they terminate. - */ - if (jp->state == JOBDONE && !jp->remembered && - (iflag || jp != bgjob)) { - freejob(jp); - } - } - } -} - - -/* - * Mark a job structure as unused. - */ - -static void -freejob(struct job *jp) -{ - struct procstat *ps; - int i; - - INTOFF; - if (bgjob == jp) - bgjob = NULL; - 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; -#if JOBS - deljob(jp); -#endif - INTON; -} - - - -int -waitcmd(int argc __unused, char **argv __unused) -{ - struct job *job; - int retval; - - nextopt(""); - if (*argptr == NULL) - return (waitcmdloop(NULL)); - - do { - job = getjob_nonotfound(*argptr); - if (job == NULL) - retval = 127; - else - retval = waitcmdloop(job); - argptr++; - } while (*argptr != NULL); - - return (retval); -} - -static int -waitcmdloop(struct job *job) -{ - int status, retval, sig; - struct job *jp; - - /* - * Loop until a process is terminated or stopped, or a SIGINT is - * received. - */ - - do { - if (job != NULL) { - if (job->state == JOBDONE) { - status = job->ps[job->nprocs - 1].status; - if (WIFEXITED(status)) - retval = WEXITSTATUS(status); - else - retval = WTERMSIG(status) + 128; - if (! iflag || ! job->changed) - freejob(job); - else { - job->remembered = 0; - if (job == bgjob) - bgjob = NULL; - } - return retval; - } - } else { - for (jp = jobtab ; jp < jobtab + njobs; jp++) - if (jp->used && jp->state == JOBDONE) { - if (! iflag || ! jp->changed) - freejob(jp); - else { - jp->remembered = 0; - if (jp == bgjob) - bgjob = NULL; - } - } - for (jp = jobtab ; ; jp++) { - if (jp >= jobtab + njobs) { /* no running procs */ - return 0; - } - if (jp->used && jp->state == 0) - break; - } - } - } while (dowait(DOWAIT_BLOCK | DOWAIT_SIG, (struct job *)NULL) != -1); - - sig = pendingsig_waitcmd; - pendingsig_waitcmd = 0; - return sig + 128; -} - - - -int -jobidcmd(int argc __unused, char **argv __unused) -{ - struct job *jp; - int i; - - nextopt(""); - jp = getjob(*argptr); - for (i = 0 ; i < jp->nprocs ; ) { - out1fmt("%d", (int)jp->ps[i].pid); - out1c(++i < jp->nprocs? ' ' : '\n'); - } - return 0; -} - - - -/* - * Convert a job name to a job structure. - */ - -static struct job * -getjob_nonotfound(const char *name) -{ - int jobno; - struct job *found, *jp; - size_t namelen; - pid_t pid; - int i; - - if (name == NULL) { -#if JOBS - name = "%+"; -#else - error("No current job"); -#endif - } - if (name[0] == '%') { - if (is_digit(name[1])) { - jobno = number(name + 1); - if (jobno > 0 && jobno <= njobs - && jobtab[jobno - 1].used != 0) - return &jobtab[jobno - 1]; -#if JOBS - } else if ((name[1] == '%' || name[1] == '+') && - name[2] == '\0') { - if ((jp = getcurjob(NULL)) == NULL) - error("No current job"); - return (jp); - } else if (name[1] == '-' && name[2] == '\0') { - if ((jp = getcurjob(NULL)) == NULL || - (jp = getcurjob(jp)) == NULL) - error("No previous job"); - return (jp); -#endif - } else if (name[1] == '?') { - found = NULL; - for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { - if (jp->used && jp->nprocs > 0 - && strstr(jp->ps[0].cmd, name + 2) != NULL) { - if (found) - error("%s: ambiguous", name); - found = jp; - } - } - if (found != NULL) - return (found); - } else { - namelen = strlen(name); - found = NULL; - for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { - if (jp->used && jp->nprocs > 0 - && strncmp(jp->ps[0].cmd, name + 1, - namelen - 1) == 0) { - if (found) - error("%s: ambiguous", name); - found = jp; - } - } - if (found) - return found; - } - } else if (is_number(name)) { - pid = (pid_t)number(name); - for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { - if (jp->used && jp->nprocs > 0 - && jp->ps[jp->nprocs - 1].pid == pid) - return jp; - } - } - return NULL; -} - - -static struct job * -getjob(const char *name) -{ - struct job *jp; - - jp = getjob_nonotfound(name); - if (jp == NULL) - error("No such job: %s", name); - return (jp); -} - - -int -killjob(const char *name, int sig) -{ - struct job *jp; - int i, ret; - - jp = getjob(name); - if (jp->state == JOBDONE) - return 0; - if (jp->jobctl) - return kill(-jp->ps[0].pid, sig); - ret = -1; - errno = ESRCH; - for (i = 0; i < jp->nprocs; i++) - if (jp->ps[i].status == -1 || WIFSTOPPED(jp->ps[i].status)) { - if (kill(jp->ps[i].pid, sig) == 0) - ret = 0; - } else - ret = 0; - return ret; -} - -/* - * Return a new job structure, - */ - -struct job * -makejob(union node *node __unused, int nprocs) -{ - int i; - struct job *jp; - - for (i = njobs, jp = jobtab ; ; jp++) { - if (--i < 0) { - INTOFF; - if (njobs == 0) { - jobtab = ckmalloc(4 * sizeof jobtab[0]); -#if JOBS - jobmru = NULL; -#endif - } else { - jp = ckmalloc((njobs + 4) * sizeof jobtab[0]); - memcpy(jp, jobtab, njobs * sizeof jp[0]); -#if JOBS - /* Relocate `next' pointers and list head */ - if (jobmru != NULL) - jobmru = &jp[jobmru - jobtab]; - for (i = 0; i < njobs; i++) - if (jp[i].next != NULL) - jp[i].next = &jp[jp[i].next - - jobtab]; -#endif - if (bgjob != NULL) - bgjob = &jp[bgjob - jobtab]; - /* Relocate `ps' pointers */ - for (i = 0; i < njobs; i++) - if (jp[i].ps == &jobtab[i].ps0) - jp[i].ps = &jp[i].ps0; - ckfree(jobtab); - jobtab = jp; - } - jp = jobtab + njobs; - for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0) - ; - INTON; - break; - } - if (jp->used == 0) - break; - } - INTOFF; - jp->state = 0; - jp->used = 1; - jp->changed = 0; - jp->nprocs = 0; - jp->foreground = 0; - jp->remembered = 0; -#if JOBS - jp->jobctl = jobctl; - jp->next = NULL; -#endif - if (nprocs > 1) { - jp->ps = ckmalloc(nprocs * sizeof (struct procstat)); - } else { - jp->ps = &jp->ps0; - } - INTON; - TRACE(("makejob(%p, %d) returns %%%td\n", (void *)node, nprocs, - jp - jobtab + 1)); - return jp; -} - -#if JOBS -static void -setcurjob(struct job *cj) -{ - struct job *jp, *prev; - - for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) { - if (jp == cj) { - if (prev != NULL) - prev->next = jp->next; - else - jobmru = jp->next; - jp->next = jobmru; - jobmru = cj; - return; - } - } - cj->next = jobmru; - jobmru = cj; -} - -static void -deljob(struct job *j) -{ - struct job *jp, *prev; - - for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) { - if (jp == j) { - if (prev != NULL) - prev->next = jp->next; - else - jobmru = jp->next; - return; - } - } -} - -/* - * Return the most recently used job that isn't `nj', and preferably one - * that is stopped. - */ -static struct job * -getcurjob(struct job *nj) -{ - struct job *jp; - - /* Try to find a stopped one.. */ - for (jp = jobmru; jp != NULL; jp = jp->next) - if (jp->used && jp != nj && jp->state == JOBSTOPPED) - return (jp); - /* Otherwise the most recently used job that isn't `nj' */ - for (jp = jobmru; jp != NULL; jp = jp->next) - if (jp->used && jp != nj) - return (jp); - - return (NULL); -} - -#endif - -/* - * Fork of 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). - */ - -pid_t -forkshell(struct job *jp, union node *n, int mode) -{ - pid_t pid; - pid_t pgrp; - - TRACE(("forkshell(%%%td, %p, %d) called\n", jp - jobtab, (void *)n, - mode)); - INTOFF; - if (mode == FORK_BG && (jp == NULL || jp->nprocs == 0)) - checkzombies(); - flushall(); - pid = fork(); - if (pid == -1) { - TRACE(("Fork failed, errno=%d\n", errno)); - INTON; - error("Cannot fork: %s", strerror(errno)); - } - if (pid == 0) { - struct job *p; - int wasroot; - int i; - - TRACE(("Child shell %d\n", (int)getpid())); - wasroot = rootshell; - rootshell = 0; - handler = &main_handler; - closescript(); - INTON; - forcelocal = 0; - clear_traps(); -#if JOBS - jobctl = 0; /* do job control only in root shell */ - if (wasroot && mode != FORK_NOJOB && mflag) { - if (jp == NULL || jp->nprocs == 0) - pgrp = getpid(); - else - pgrp = jp->ps[0].pid; - if (setpgid(0, pgrp) == 0 && mode == FORK_FG && - ttyfd >= 0) { - /*** this causes superfluous TIOCSPGRPS ***/ - if (tcsetpgrp(ttyfd, pgrp) < 0) - error("tcsetpgrp failed, errno=%d", errno); - } - setsignal(SIGTSTP); - setsignal(SIGTTOU); - } else if (mode == FORK_BG) { - ignoresig(SIGINT); - ignoresig(SIGQUIT); - if ((jp == NULL || jp->nprocs == 0) && - ! fd0_redirected_p ()) { - close(0); - if (open(_PATH_DEVNULL, O_RDONLY) != 0) - error("cannot open %s: %s", - _PATH_DEVNULL, strerror(errno)); - } - } -#else - if (mode == FORK_BG) { - ignoresig(SIGINT); - ignoresig(SIGQUIT); - if ((jp == NULL || jp->nprocs == 0) && - ! fd0_redirected_p ()) { - close(0); - if (open(_PATH_DEVNULL, O_RDONLY) != 0) - error("cannot open %s: %s", - _PATH_DEVNULL, strerror(errno)); - } - } -#endif - INTOFF; - for (i = njobs, p = jobtab ; --i >= 0 ; p++) - if (p->used) - freejob(p); - INTON; - if (wasroot && iflag) { - setsignal(SIGINT); - setsignal(SIGQUIT); - setsignal(SIGTERM); - } - return pid; - } - if (rootshell && mode != FORK_NOJOB && mflag) { - if (jp == NULL || jp->nprocs == 0) - pgrp = pid; - else - pgrp = jp->ps[0].pid; - setpgid(pid, pgrp); - } - if (mode == FORK_BG) { - if (bgjob != NULL && bgjob->state == JOBDONE && - !bgjob->remembered && !iflag) - freejob(bgjob); - backgndpid = pid; /* set $! */ - bgjob = jp; - } - if (jp) { - struct procstat *ps = &jp->ps[jp->nprocs++]; - ps->pid = pid; - ps->status = -1; - ps->cmd = nullstr; - if (iflag && rootshell && n) - ps->cmd = commandtext(n); - jp->foreground = mode == FORK_FG; -#if JOBS - setcurjob(jp); -#endif - } - INTON; - TRACE(("In parent shell: child = %d\n", (int)pid)); - return pid; -} - - -pid_t -vforkexecshell(struct job *jp, char **argv, char **envp, const char *path, int idx, int pip[2]) -{ - pid_t pid; - struct jmploc jmploc; - struct jmploc *savehandler; - - TRACE(("vforkexecshell(%%%td, %s, %p) called\n", jp - jobtab, argv[0], - (void *)pip)); - INTOFF; - flushall(); - savehandler = handler; - pid = vfork(); - if (pid == -1) { - TRACE(("Vfork failed, errno=%d\n", errno)); - INTON; - error("Cannot fork: %s", strerror(errno)); - } - if (pid == 0) { - TRACE(("Child shell %d\n", (int)getpid())); - if (setjmp(jmploc.loc)) - _exit(exception == EXEXEC ? exerrno : 2); - if (pip != NULL) { - close(pip[0]); - if (pip[1] != 1) { - dup2(pip[1], 1); - close(pip[1]); - } - } - handler = &jmploc; - shellexec(argv, envp, path, idx); - } - handler = savehandler; - if (jp) { - struct procstat *ps = &jp->ps[jp->nprocs++]; - ps->pid = pid; - ps->status = -1; - ps->cmd = nullstr; - jp->foreground = 1; -#if JOBS - setcurjob(jp); -#endif - } - INTON; - TRACE(("In parent shell: child = %d\n", (int)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 - * foreground 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. - */ - -int -waitforjob(struct job *jp, int *signaled) -{ -#if JOBS - int propagate_int = jp->jobctl && jp->foreground; -#endif - int status; - int st; - - INTOFF; - TRACE(("waitforjob(%%%td) called\n", jp - jobtab + 1)); - while (jp->state == 0) - if (dowait(DOWAIT_BLOCK | (Tflag ? DOWAIT_SIG | - DOWAIT_SIG_TRAP : 0), jp) == -1) - dotrap(); -#if JOBS - if (jp->jobctl) { - if (ttyfd >= 0 && tcsetpgrp(ttyfd, rootpid) < 0) - error("tcsetpgrp failed, errno=%d\n", errno); - } - if (jp->state == JOBSTOPPED) - setcurjob(jp); -#endif - status = jp->ps[jp->nprocs - 1].status; - if (signaled != NULL) - *signaled = WIFSIGNALED(status); - /* convert to 8 bits */ - if (WIFEXITED(status)) - st = WEXITSTATUS(status); -#if JOBS - else if (WIFSTOPPED(status)) - st = WSTOPSIG(status) + 128; -#endif - else - st = WTERMSIG(status) + 128; - if (! JOBS || jp->state == JOBDONE) - freejob(jp); - if (int_pending()) { - if (!WIFSIGNALED(status) || WTERMSIG(status) != SIGINT) - CLEAR_PENDING_INT; - } -#if JOBS - else if (rootshell && propagate_int && - WIFSIGNALED(status) && WTERMSIG(status) == SIGINT) - kill(getpid(), SIGINT); -#endif - INTON; - return st; -} - - -static void -dummy_handler(int sig __unused) -{ -} - -/* - * Wait for a process to terminate. - */ - -static pid_t -dowait(int mode, struct job *job) -{ - struct sigaction sa, osa; - sigset_t mask, omask; - pid_t pid; - int status; - struct procstat *sp; - struct job *jp; - struct job *thisjob; - const char *sigstr; - int done; - int stopped; - int sig; - int coredump; - int wflags; - int restore_sigchld; - - TRACE(("dowait(%d, %p) called\n", mode, job)); - restore_sigchld = 0; - if ((mode & DOWAIT_SIG) != 0) { - sigfillset(&mask); - sigprocmask(SIG_BLOCK, &mask, &omask); - INTOFF; - if (!issigchldtrapped()) { - restore_sigchld = 1; - sa.sa_handler = dummy_handler; - sa.sa_flags = 0; - sigemptyset(&sa.sa_mask); - sigaction(SIGCHLD, &sa, &osa); - } - } - do { -#if JOBS - if (iflag) - wflags = WUNTRACED | WCONTINUED; - else -#endif - wflags = 0; - if ((mode & (DOWAIT_BLOCK | DOWAIT_SIG)) != DOWAIT_BLOCK) - wflags |= WNOHANG; - pid = wait3(&status, wflags, (struct rusage *)NULL); - TRACE(("wait returns %d, status=%d\n", (int)pid, status)); - if (pid == 0 && (mode & DOWAIT_SIG) != 0) { - pid = -1; - if (((mode & DOWAIT_SIG_TRAP) != 0 ? - pendingsig : pendingsig_waitcmd) != 0) { - errno = EINTR; - break; - } - sigsuspend(&omask); - if (int_pending()) - break; - } - } while (pid == -1 && errno == EINTR); - if (pid == -1 && errno == ECHILD && job != NULL) - job->state = JOBDONE; - if ((mode & DOWAIT_SIG) != 0) { - if (restore_sigchld) - sigaction(SIGCHLD, &osa, NULL); - sigprocmask(SIG_SETMASK, &omask, NULL); - INTON; - } - if (pid <= 0) - return pid; - INTOFF; - thisjob = NULL; - for (jp = jobtab ; jp < jobtab + njobs ; jp++) { - if (jp->used && jp->nprocs > 0) { - done = 1; - stopped = 1; - for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) { - if (sp->pid == -1) - continue; - if (sp->pid == pid && (sp->status == -1 || - WIFSTOPPED(sp->status))) { - TRACE(("Changing status of proc %d from 0x%x to 0x%x\n", - (int)pid, sp->status, - status)); - if (WIFCONTINUED(status)) { - sp->status = -1; - jp->state = 0; - } else - sp->status = status; - thisjob = jp; - } - if (sp->status == -1) - stopped = 0; - else if (WIFSTOPPED(sp->status)) - done = 0; - } - if (stopped) { /* stopped or done */ - int state = done? JOBDONE : JOBSTOPPED; - if (jp->state != state) { - TRACE(("Job %td: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state)); - jp->state = state; - if (jp != job) { - if (done && !jp->remembered && - !iflag && jp != bgjob) - freejob(jp); -#if JOBS - else if (done) - deljob(jp); -#endif - } - } - } - } - } - INTON; - if (!thisjob || thisjob->state == 0) - ; - else if ((!rootshell || !iflag || thisjob == job) && - thisjob->foreground && thisjob->state != JOBSTOPPED) { - sig = 0; - coredump = 0; - for (sp = thisjob->ps; sp < thisjob->ps + thisjob->nprocs; sp++) - if (WIFSIGNALED(sp->status)) { - sig = WTERMSIG(sp->status); - coredump = WCOREDUMP(sp->status); - } - if (sig > 0 && sig != SIGINT && sig != SIGPIPE) { - sigstr = strsignal(sig); - if (sigstr != NULL) - out2str(sigstr); - else - out2str("Unknown signal"); - if (coredump) - out2str(" (core dumped)"); - out2c('\n'); - flushout(out2); - } - } else { - TRACE(("Not printing status, rootshell=%d, job=%p\n", rootshell, job)); - thisjob->changed = 1; - } - return pid; -} - - - -/* - * return 1 if there are stopped jobs, otherwise 0 - */ -int job_warning = 0; -int -stoppedjobs(void) -{ - int jobno; - struct job *jp; - - if (job_warning) - return (0); - for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) { - if (jp->used == 0) - continue; - if (jp->state == JOBSTOPPED) { - out2fmt_flush("You have stopped jobs.\n"); - job_warning = 2; - return (1); - } - } - - return (0); -} - - -static void -checkzombies(void) -{ - while (njobs > 0 && dowait(0, NULL) > 0) - ; -} - - -int -backgndpidset(void) -{ - return backgndpid != -1; -} - - -pid_t -backgndpidval(void) -{ - if (bgjob != NULL && !forcelocal) - bgjob->remembered = 1; - return backgndpid; -} - -/* - * Return a string identifying a command (to be printed by the - * jobs command. - */ - -static char *cmdnextc; -static int cmdnleft; -#define MAXCMDTEXT 200 - -char * -commandtext(union node *n) -{ - char *name; - - cmdnextc = name = ckmalloc(MAXCMDTEXT); - cmdnleft = MAXCMDTEXT - 4; - cmdtxt(n); - *cmdnextc = '\0'; - return name; -} - - -static void -cmdtxtdogroup(union node *n) -{ - cmdputs("; do "); - cmdtxt(n); - cmdputs("; done"); -} - - -static void -cmdtxtredir(union node *n, const char *op, int deffd) -{ - char s[2]; - - if (n->nfile.fd != deffd) { - s[0] = n->nfile.fd + '0'; - s[1] = '\0'; - cmdputs(s); - } - cmdputs(op); - if (n->type == NTOFD || n->type == NFROMFD) { - if (n->ndup.dupfd >= 0) - s[0] = n->ndup.dupfd + '0'; - else - s[0] = '-'; - s[1] = '\0'; - cmdputs(s); - } else { - cmdtxt(n->nfile.fname); - } -} - - -static void -cmdtxt(union node *n) -{ - union node *np; - struct nodelist *lp; - - if (n == NULL) - return; - switch (n->type) { - case NSEMI: - cmdtxt(n->nbinary.ch1); - cmdputs("; "); - cmdtxt(n->nbinary.ch2); - break; - case NAND: - cmdtxt(n->nbinary.ch1); - cmdputs(" && "); - cmdtxt(n->nbinary.ch2); - break; - case NOR: - cmdtxt(n->nbinary.ch1); - cmdputs(" || "); - cmdtxt(n->nbinary.ch2); - break; - case NPIPE: - for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { - cmdtxt(lp->n); - if (lp->next) - cmdputs(" | "); - } - break; - case NSUBSHELL: - cmdputs("("); - cmdtxt(n->nredir.n); - cmdputs(")"); - break; - case NREDIR: - case NBACKGND: - cmdtxt(n->nredir.n); - break; - case NIF: - cmdputs("if "); - cmdtxt(n->nif.test); - cmdputs("; then "); - cmdtxt(n->nif.ifpart); - cmdputs("..."); - break; - case NWHILE: - cmdputs("while "); - cmdtxt(n->nbinary.ch1); - cmdtxtdogroup(n->nbinary.ch2); - break; - case NUNTIL: - cmdputs("until "); - cmdtxt(n->nbinary.ch1); - cmdtxtdogroup(n->nbinary.ch2); - break; - case NFOR: - cmdputs("for "); - cmdputs(n->nfor.var); - cmdputs(" in ..."); - break; - case NCASE: - cmdputs("case "); - cmdputs(n->ncase.expr->narg.text); - cmdputs(" in ..."); - break; - case NDEFUN: - cmdputs(n->narg.text); - cmdputs("() ..."); - break; - case NNOT: - cmdputs("! "); - cmdtxt(n->nnot.com); - break; - case NCMD: - for (np = n->ncmd.args ; np ; np = np->narg.next) { - cmdtxt(np); - if (np->narg.next) - cmdputs(" "); - } - for (np = n->ncmd.redirect ; np ; np = np->nfile.next) { - cmdputs(" "); - cmdtxt(np); - } - break; - case NARG: - cmdputs(n->narg.text); - break; - case NTO: - cmdtxtredir(n, ">", 1); - break; - case NAPPEND: - cmdtxtredir(n, ">>", 1); - break; - case NTOFD: - cmdtxtredir(n, ">&", 1); - break; - case NCLOBBER: - cmdtxtredir(n, ">|", 1); - break; - case NFROM: - cmdtxtredir(n, "<", 0); - break; - case NFROMTO: - cmdtxtredir(n, "<>", 0); - break; - case NFROMFD: - cmdtxtredir(n, "<&", 0); - break; - case NHERE: - case NXHERE: - cmdputs("<<..."); - break; - default: - cmdputs("???"); - break; - } -} - - - -static void -cmdputs(const char *s) -{ - const char *p; - char *q; - char c; - int subtype = 0; - - if (cmdnleft <= 0) - return; - p = s; - q = cmdnextc; - while ((c = *p++) != '\0') { - if (c == CTLESC) - *q++ = *p++; - else if (c == CTLVAR) { - *q++ = '$'; - if (--cmdnleft > 0) - *q++ = '{'; - subtype = *p++; - if ((subtype & VSTYPE) == VSLENGTH && --cmdnleft > 0) - *q++ = '#'; - } else if (c == '=' && subtype != 0) { - *q = "}-+?=##%%\0X"[(subtype & VSTYPE) - VSNORMAL]; - if (*q) - q++; - else - cmdnleft++; - if (((subtype & VSTYPE) == VSTRIMLEFTMAX || - (subtype & VSTYPE) == VSTRIMRIGHTMAX) && - --cmdnleft > 0) - *q = q[-1], q++; - subtype = 0; - } else if (c == CTLENDVAR) { - *q++ = '}'; - } else if (c == CTLBACKQ || c == CTLBACKQ+CTLQUOTE) { - cmdnleft -= 5; - if (cmdnleft > 0) { - *q++ = '$'; - *q++ = '('; - *q++ = '.'; - *q++ = '.'; - *q++ = '.'; - *q++ = ')'; - } - } else if (c == CTLARI) { - cmdnleft -= 2; - if (cmdnleft > 0) { - *q++ = '$'; - *q++ = '('; - *q++ = '('; - } - p++; - } else if (c == CTLENDARI) { - if (--cmdnleft > 0) { - *q++ = ')'; - *q++ = ')'; - } - } else if (c == CTLQUOTEMARK || c == CTLQUOTEEND) - cmdnleft++; /* ignore */ - else - *q++ = c; - if (--cmdnleft <= 0) { - *q++ = '.'; - *q++ = '.'; - *q++ = '.'; - break; - } - } - cmdnextc = q; -} |