diff options
| -rw-r--r-- | shell/ash.c | 3089 |
1 files changed, 1541 insertions, 1548 deletions
diff --git a/shell/ash.c b/shell/ash.c index e3a4397..869ed12 100644 --- a/shell/ash.c +++ b/shell/ash.c @@ -1583,8 +1583,18 @@ struct localvar { /* Forward decls for varinit[] */ #if ENABLE_LOCALE_SUPPORT -static void change_lc_all(const char *value); -static void change_lc_ctype(const char *value); +static void +change_lc_all(const char *value) +{ + if (value && *value != '\0') + setlocale(LC_ALL, value); +} +static void +change_lc_ctype(const char *value) +{ + if (value && *value != '\0') + setlocale(LC_CTYPE, value); +} #endif #if ENABLE_ASH_MAIL static void chkmail(void); @@ -2863,72 +2873,6 @@ static unsigned long rseed; #endif -/* jobs.h */ - -/* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */ -#define FORK_FG 0 -#define FORK_BG 1 -#define FORK_NOJOB 2 - -/* mode flags for showjob(s) */ -#define SHOW_PGID 0x01 /* only show pgid - for jobs -p */ -#define SHOW_PID 0x04 /* include process pid */ -#define SHOW_CHANGED 0x08 /* only jobs whose state has changed */ - - -/* - * 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; /* last process status from wait() */ - char *cmd; /* text of command being run */ -}; - -struct job { - struct procstat ps0; /* status of process */ - struct procstat *ps; /* status or processes when more than one */ -#if JOBS - int stopstatus; /* status of a stopped job */ -#endif - uint32_t - nprocs: 16, /* number of processes */ - state: 8, -#define JOBRUNNING 0 /* at least one proc running */ -#define JOBSTOPPED 1 /* all procs are stopped */ -#define JOBDONE 2 /* all procs are completed */ -#if JOBS - sigint: 1, /* job was killed by SIGINT */ - jobctl: 1, /* job running under job control */ -#endif - waited: 1, /* true if this entry has been waited for */ - used: 1, /* true if this entry is in used */ - changed: 1; /* true if status has changed */ - struct job *prev_job; /* previous job */ -}; - -static pid_t backgndpid; /* pid of last background process */ -static int job_warning; /* user was warned about stopped jobs */ -#if JOBS -static int jobctl; /* true if doing job control */ -#endif - -static struct job *makejob(union node *, int); -static int forkshell(struct job *, union node *, int); -static int waitforjob(struct job *); - -#if ! JOBS -#define setjobctl(on) /* do nothing */ -#else -static void setjobctl(int); -static void showjobs(FILE *, int); -#endif - - /* main.h */ static void readcmdfile(char *); @@ -3159,6 +3103,1535 @@ unaliascmd(int argc, char **argv) #endif /* ASH_ALIAS */ +/* ============ jobs.c */ + +/* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */ +#define FORK_FG 0 +#define FORK_BG 1 +#define FORK_NOJOB 2 + +/* mode flags for showjob(s) */ +#define SHOW_PGID 0x01 /* only show pgid - for jobs -p */ +#define SHOW_PID 0x04 /* include process pid */ +#define SHOW_CHANGED 0x08 /* only jobs whose state has changed */ + + +/* + * 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; /* last process status from wait() */ + char *cmd; /* text of command being run */ +}; + +struct job { + struct procstat ps0; /* status of process */ + struct procstat *ps; /* status or processes when more than one */ +#if JOBS + int stopstatus; /* status of a stopped job */ +#endif + uint32_t + nprocs: 16, /* number of processes */ + state: 8, +#define JOBRUNNING 0 /* at least one proc running */ +#define JOBSTOPPED 1 /* all procs are stopped */ +#define JOBDONE 2 /* all procs are completed */ +#if JOBS + sigint: 1, /* job was killed by SIGINT */ + jobctl: 1, /* job running under job control */ +#endif + waited: 1, /* true if this entry has been waited for */ + used: 1, /* true if this entry is in used */ + changed: 1; /* true if status has changed */ + struct job *prev_job; /* previous job */ +}; + +static pid_t backgndpid; /* pid of last background process */ +static int job_warning; /* user was warned about stopped jobs */ +#if JOBS +static int jobctl; /* true if doing job control */ +#endif + +static struct job *makejob(union node *, int); +static int forkshell(struct job *, union node *, int); +static int waitforjob(struct job *); + +#if ! JOBS +#define setjobctl(on) /* do nothing */ +#else +static void setjobctl(int); +static void showjobs(FILE *, int); +#endif + +/* + * Set the signal handler for the specified signal. The routine figures + * out what it should be set to. + */ +static void +setsignal(int signo) +{ + int action; + char *t, tsig; + struct sigaction act; + + t = trap[signo]; + if (t == NULL) + action = S_DFL; + else if (*t != '\0') + action = S_CATCH; + else + action = S_IGN; + if (rootshell && action == S_DFL) { + switch (signo) { + case SIGINT: + if (iflag || minusc || sflag == 0) + action = S_CATCH; + break; + case SIGQUIT: +#if DEBUG + if (debug) + break; +#endif + /* FALLTHROUGH */ + case SIGTERM: + if (iflag) + action = S_IGN; + break; +#if JOBS + case SIGTSTP: + case SIGTTOU: + if (mflag) + action = S_IGN; + break; +#endif + } + } + + t = &sigmode[signo - 1]; + tsig = *t; + if (tsig == 0) { + /* + * current setting unknown + */ + if (sigaction(signo, 0, &act) == -1) { + /* + * Pretend it worked; maybe we should give a warning + * here, but other shells don't. We don't alter + * sigmode, so that we retry every time. + */ + return; + } + if (act.sa_handler == SIG_IGN) { + if (mflag + && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU) + ) { + tsig = S_IGN; /* don't hard ignore these */ + } else + tsig = S_HARD_IGN; + } else { + tsig = S_RESET; /* force to be set */ + } + } + if (tsig == S_HARD_IGN || tsig == action) + return; + switch (action) { + case S_CATCH: + act.sa_handler = onsig; + break; + case S_IGN: + act.sa_handler = SIG_IGN; + break; + default: + act.sa_handler = SIG_DFL; + } + *t = action; + act.sa_flags = 0; + sigfillset(&act.sa_mask); + sigaction(signo, &act, 0); +} + +/* 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 + +#if JOBS +/* pgrp of shell on invocation */ +static int initialpgrp; +static int ttyfd = -1; +#endif +/* array of jobs */ +static struct job *jobtab; +/* size of array */ +static unsigned njobs; +/* current job */ +static struct job *curjob; +/* number of presumed living untracked jobs */ +static int jobless; + +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: +#if 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 + if (!jp1 || jp1->state != JOBSTOPPED) +#endif + 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 || DEBUG +static int +jobno(const struct job *jp) +{ + return jp - jobtab + 1; +} +#endif + +/* + * 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; + } + 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: + ash_msg_and_raise_error(err_msg, name); +} + +/* + * Mark a job structure as unused. + */ +static void +freejob(struct job *jp) +{ + struct procstat *ps; + int i; + + INT_OFF; + for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) { + if (ps->cmd != nullstr) + free(ps->cmd); + } + if (jp->ps != &jp->ps0) + free(jp->ps); + jp->used = 0; + set_curjob(jp, CUR_DELETE); + INT_ON; +} + +#if JOBS +static void +xtcsetpgrp(int fd, pid_t pgrp) +{ + if (tcsetpgrp(fd, pgrp)) + ash_msg_and_raise_error("Cannot set tty process group (%m)"); +} + +/* + * 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. + */ +static 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) { + /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails. + * That sometimes helps to acquire controlling tty. + * Obviously, a workaround for bugs when someone + * failed to provide a controlling tty to bash! :) */ + fd += 3; + while (!isatty(fd) && --fd >= 0) + ; + } + fd = fcntl(fd, F_DUPFD, 10); + close(ofd); + if (fd < 0) + goto out; + fcntl(fd, F_SETFD, FD_CLOEXEC); + do { /* while we are in the background */ + pgrp = tcgetpgrp(fd); + if (pgrp < 0) { + out: + ash_msg("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; +} + +static int +killcmd(int argc, char **argv) +{ + int signo = -1; + int list = 0; + int i; + pid_t pid; + struct job *jp; + + if (argc <= 1) { + usage: + ash_msg_and_raise_error( +"Usage: kill [-s sigspec | -signum | -sigspec] [pid | job]... or\n" +"kill -l [exitstatus]" + ); + } + + if (**++argv == '-') { + signo = get_signum(*argv + 1); + if (signo < 0) { + int c; + + while ((c = nextopt("ls:")) != '\0') { + switch (c) { + default: +#if DEBUG + abort(); +#endif + case 'l': + list = 1; + break; + case 's': + signo = get_signum(optionarg); + if (signo < 0) { + ash_msg_and_raise_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) { + const char *name; + + if (!*argv) { + for (i = 1; i < NSIG; i++) { + name = get_signame(i); + if (isdigit(*name)) + out1fmt(snlfmt, name); + } + return 0; + } + name = get_signame(signo); + if (!isdigit(*name)) + ash_msg_and_raise_error("invalid signal number or exit status: %s", *argptr); + out1fmt(snlfmt, name); + 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) { + ash_msg("(%d) - %m", pid); + i = 1; + } + } while (*++argv); + + return i; +} + +static void +showpipe(struct job *jp, FILE *out) +{ + struct procstat *sp; + struct procstat *spend; + + spend = jp->ps + jp->nprocs; + for (sp = jp->ps + 1; sp < spend; sp++) + fprintf(out, " | %s", sp->cmd); + outcslow('\n', out); + flush_stdout_stderr(); +} + + +static int +restartjob(struct job *jp, int mode) +{ + struct procstat *ps; + int i; + int status; + pid_t pgid; + + INT_OFF; + 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; + INT_ON; + return status; +} + +static int +fg_bgcmd(int argc, char **argv) +{ + struct job *jp; + FILE *out; + int mode; + int retval; + + mode = (**argv == 'f') ? FORK_FG : FORK_BG; + nextopt(nullstr); + argv = argptr; + out = stdout; + do { + jp = getjob(*argv, 1); + if (mode == FORK_BG) { + set_curjob(jp, CUR_RUNNING); + fprintf(out, "[%d] ", jobno(jp)); + } + outstr(jp->ps->cmd, out); + showpipe(jp, out); + retval = restartjob(jp, mode); + } while (*argv && *++argv); + return retval; +} +#endif + +static int +sprint_status(char *s, int status, int sigonly) +{ + int col; + int st; + + col = 0; + if (!WIFEXITED(status)) { +#if JOBS + if (WIFSTOPPED(status)) + st = WSTOPSIG(status); + else +#endif + st = WTERMSIG(status); + if (sigonly) { + if (st == SIGINT || st == SIGPIPE) + goto out; +#if JOBS + if (WIFSTOPPED(status)) + goto out; +#endif + } + st &= 0x7f; + col = fmtstr(s, 32, strsignal(st)); + if (WCOREDUMP(status)) { + col += fmtstr(s + col, 16, " (core dumped)"); + } + } else if (!sigonly) { + st = WEXITSTATUS(status); + if (st) + col = fmtstr(s, 16, "Done(%d)", st); + else + col = fmtstr(s, 16, "Done"); + } + out: + return col; +} + +/* + * 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. + */ +static int +waitproc(int block, int *status) +{ + int flags = 0; + +#if JOBS + if (jobctl) + flags |= WUNTRACED; +#endif + if (block == 0) + flags |= WNOHANG; + return wait3(status, flags, (struct rusage *)NULL); +} + +/* + * Wait for a process to terminate. + */ +static int +dowait(int block, struct job *job) +{ + int pid; + int status; + struct job *jp; + struct job *thisjob; + int state; + + TRACE(("dowait(%d) called\n", block)); + pid = waitproc(block, &status); + TRACE(("wait returns pid %d, status=%d\n", pid, status)); + if (pid <= 0) + return pid; + INT_OFF; + thisjob = NULL; + 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 + if (!WIFSTOPPED(status)) +#endif + + 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: + INT_ON; + + 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; + out2str(s); + } + } + return pid; +} + +#if JOBS +static void +showjob(FILE *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 */ + fprintf(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) { + strcpy(s + col, "Running"); + col += sizeof("Running") - 1; + } else { + int status = psend[-1].status; + if (jp->state == JOBSTOPPED) + status = jp->stopstatus; + 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: + fprintf(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); + } +} + +static int +jobscmd(int argc, char **argv) +{ + int mode, m; + FILE *out; + + mode = 0; + while ((m = nextopt("lp"))) { + if (m == 'l') + mode = SHOW_PID; + else + mode = SHOW_PGID; + } + + out = stdout; + 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. + */ +static void +showjobs(FILE *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); + } +} +#endif /* JOBS */ + +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; +} + +static int +waitcmd(int argc, char **argv) +{ + struct job *job; + int retval; + struct job *jp; + + EXSIGON; + + 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; + } + dowait(DOWAIT_BLOCK, 0); + } + } + + 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) + dowait(DOWAIT_BLOCK, 0); + job->waited = 1; + retval = getstatus(job); + repeat: + ; + } while (*++argv); + + out: + return retval; +} + +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 (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; +} + +/* + * Return a new job structure. + * Called with interrupts off. + */ +static 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 JOBS + if (jobctl) + continue; +#endif + 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; +} + +#if JOBS +/* + * Return a string identifying a command (to be printed by the + * jobs command). + */ +static char *cmdnextc; + +static void +cmdputs(const char *s) +{ + const char *p, *str; + char c, cc[2] = " "; + char *nextc; + 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 = "${#"; + else + str = "${"; + if (!(subtype & VSQUOTE) == !(quoted & 1)) + goto dostr; + quoted ^= 1; + c = '"'; + break; + case CTLENDVAR: + str = "\"}" + !(quoted & 1); + quoted >>= 1; + subtype = 0; + goto dostr; + case CTLBACKQ: + str = "$(...)"; + goto dostr; + case CTLBACKQ+CTLQUOTE: + str = "\"$(...)\""; + goto dostr; +#if ENABLE_ASH_MATH_SUPPORT + case CTLARI: + str = "$(("; + goto dostr; + case CTLENDARI: + str = "))"; + goto dostr; +#endif + case CTLQUOTEMARK: + quoted ^= 1; + c = '"'; + break; + case '=': + if (subtype == 0) + break; + if ((subtype & VSTYPE) != VSNORMAL) + quoted <<= 1; + str = vstype[subtype & VSTYPE]; + if (subtype & VSNUL) + c = ':'; + else + goto checkstr; + break; + case '\'': + case '\\': + case '"': + case '$': + /* 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; +} + +/* cmdtxt() and cmdlist() call each other */ +static void cmdtxt(union node *n); + +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 +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 "); + n = n->nif.ifpart; + if (n->nif.elsepart) { + cmdtxt(n); + cmdputs("; else "); + n = n->nif.elsepart; + } + 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->narg.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; + } + n = n->nfile.fname; + goto donode; + } +} + +static char * +commandtext(union node *n) +{ + char *name; + + STARTSTACKSTR(cmdnextc); + cmdtxt(n); + name = stackblock(); + TRACE(("commandtext: name %p, end %p\n\t\"%s\"\n", + name, cmdnextc, cmdnextc)); + return ckstrdup(name); +} +#endif /* JOBS */ + +/* + * 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. + */ +/* + * Clear traps on a fork. + */ +static void +clear_traps(void) +{ + char **tp; + + for (tp = trap; tp < &trap[NSIG]; tp++) { + if (*tp && **tp) { /* trap not NULL or SIG_IGN */ + INT_OFF; + free(*tp); + *tp = NULL; + if (tp != &trap[0]) + setsignal(tp - trap); + INT_ON; + } + } +} +/* lives far away from here, needed for forkchild */ +static void closescript(void); +static 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(bb_dev_null, O_RDONLY) != 0) + ash_msg_and_raise_error("Can't open %s", bb_dev_null); + } + } + if (!oldlvl && iflag) { + setsignal(SIGINT); + setsignal(SIGQUIT); + setsignal(SIGTERM); + } + for (jp = curjob; jp; jp = jp->prev_job) + freejob(jp); + jobless = 0; +} + +static 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 */ + 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 JOBS + if (jobctl && n) + ps->cmd = commandtext(n); +#endif + } +} + +static 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); + ash_msg_and_raise_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 + * 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. + * + * Called with interrupts off. + */ +static 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); + } + if (jp->state == JOBDONE) +#endif + freejob(jp); + return st; +} + +/* + * return 1 if there are stopped jobs, otherwise 0 + */ +static 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; +} + + /* ============ Routines to expand arguments to commands * * We have to deal with backquotes, shell variables, and file metacharacters. @@ -7333,1470 +8806,6 @@ setinputstring(char *string) } -/* ============ jobs.c */ - -/* - * Set the signal handler for the specified signal. The routine figures - * out what it should be set to. - */ -static void -setsignal(int signo) -{ - int action; - char *t, tsig; - struct sigaction act; - - t = trap[signo]; - if (t == NULL) - action = S_DFL; - else if (*t != '\0') - action = S_CATCH; - else - action = S_IGN; - if (rootshell && action == S_DFL) { - switch (signo) { - case SIGINT: - if (iflag || minusc || sflag == 0) - action = S_CATCH; - break; - case SIGQUIT: -#if DEBUG - if (debug) - break; -#endif - /* FALLTHROUGH */ - case SIGTERM: - if (iflag) - action = S_IGN; - break; -#if JOBS - case SIGTSTP: - case SIGTTOU: - if (mflag) - action = S_IGN; - break; -#endif - } - } - - t = &sigmode[signo - 1]; - tsig = *t; - if (tsig == 0) { - /* - * current setting unknown - */ - if (sigaction(signo, 0, &act) == -1) { - /* - * Pretend it worked; maybe we should give a warning - * here, but other shells don't. We don't alter - * sigmode, so that we retry every time. - */ - return; - } - if (act.sa_handler == SIG_IGN) { - if (mflag - && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU) - ) { - tsig = S_IGN; /* don't hard ignore these */ - } else - tsig = S_HARD_IGN; - } else { - tsig = S_RESET; /* force to be set */ - } - } - if (tsig == S_HARD_IGN || tsig == action) - return; - switch (action) { - case S_CATCH: - act.sa_handler = onsig; - break; - case S_IGN: - act.sa_handler = SIG_IGN; - break; - default: - act.sa_handler = SIG_DFL; - } - *t = action; - act.sa_flags = 0; - sigfillset(&act.sa_mask); - sigaction(signo, &act, 0); -} - -/* 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 - -#if JOBS -/* pgrp of shell on invocation */ -static int initialpgrp; -static int ttyfd = -1; -#endif -/* array of jobs */ -static struct job *jobtab; -/* size of array */ -static unsigned njobs; -/* current job */ -static struct job *curjob; -/* number of presumed living untracked jobs */ -static int jobless; - -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: -#if 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 - if (!jp1 || jp1->state != JOBSTOPPED) -#endif - 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 || DEBUG -static int -jobno(const struct job *jp) -{ - return jp - jobtab + 1; -} -#endif - -/* - * 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; - } - 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: - ash_msg_and_raise_error(err_msg, name); -} - -/* - * Mark a job structure as unused. - */ -static void -freejob(struct job *jp) -{ - struct procstat *ps; - int i; - - INT_OFF; - for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) { - if (ps->cmd != nullstr) - free(ps->cmd); - } - if (jp->ps != &jp->ps0) - free(jp->ps); - jp->used = 0; - set_curjob(jp, CUR_DELETE); - INT_ON; -} - -#if JOBS -static void -xtcsetpgrp(int fd, pid_t pgrp) -{ - if (tcsetpgrp(fd, pgrp)) - ash_msg_and_raise_error("Cannot set tty process group (%m)"); -} - -/* - * 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. - */ -static 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) { - /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails. - * That sometimes helps to acquire controlling tty. - * Obviously, a workaround for bugs when someone - * failed to provide a controlling tty to bash! :) */ - fd += 3; - while (!isatty(fd) && --fd >= 0) - ; - } - fd = fcntl(fd, F_DUPFD, 10); - close(ofd); - if (fd < 0) - goto out; - fcntl(fd, F_SETFD, FD_CLOEXEC); - do { /* while we are in the background */ - pgrp = tcgetpgrp(fd); - if (pgrp < 0) { - out: - ash_msg("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; -} - -static int -killcmd(int argc, char **argv) -{ - int signo = -1; - int list = 0; - int i; - pid_t pid; - struct job *jp; - - if (argc <= 1) { - usage: - ash_msg_and_raise_error( -"Usage: kill [-s sigspec | -signum | -sigspec] [pid | job]... or\n" -"kill -l [exitstatus]" - ); - } - - if (**++argv == '-') { - signo = get_signum(*argv + 1); - if (signo < 0) { - int c; - - while ((c = nextopt("ls:")) != '\0') { - switch (c) { - default: -#if DEBUG - abort(); -#endif - case 'l': - list = 1; - break; - case 's': - signo = get_signum(optionarg); - if (signo < 0) { - ash_msg_and_raise_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) { - const char *name; - - if (!*argv) { - for (i = 1; i < NSIG; i++) { - name = get_signame(i); - if (isdigit(*name)) - out1fmt(snlfmt, name); - } - return 0; - } - name = get_signame(signo); - if (!isdigit(*name)) - ash_msg_and_raise_error("invalid signal number or exit status: %s", *argptr); - out1fmt(snlfmt, name); - 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) { - ash_msg("(%d) - %m", pid); - i = 1; - } - } while (*++argv); - - return i; -} - -static void -showpipe(struct job *jp, FILE *out) -{ - struct procstat *sp; - struct procstat *spend; - - spend = jp->ps + jp->nprocs; - for (sp = jp->ps + 1; sp < spend; sp++) - fprintf(out, " | %s", sp->cmd); - outcslow('\n', out); - flush_stdout_stderr(); -} - - -static int -restartjob(struct job *jp, int mode) -{ - struct procstat *ps; - int i; - int status; - pid_t pgid; - - INT_OFF; - 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; - INT_ON; - return status; -} - -static int -fg_bgcmd(int argc, char **argv) -{ - struct job *jp; - FILE *out; - int mode; - int retval; - - mode = (**argv == 'f') ? FORK_FG : FORK_BG; - nextopt(nullstr); - argv = argptr; - out = stdout; - do { - jp = getjob(*argv, 1); - if (mode == FORK_BG) { - set_curjob(jp, CUR_RUNNING); - fprintf(out, "[%d] ", jobno(jp)); - } - outstr(jp->ps->cmd, out); - showpipe(jp, out); - retval = restartjob(jp, mode); - } while (*argv && *++argv); - return retval; -} -#endif - -static int -sprint_status(char *s, int status, int sigonly) -{ - int col; - int st; - - col = 0; - if (!WIFEXITED(status)) { -#if JOBS - if (WIFSTOPPED(status)) - st = WSTOPSIG(status); - else -#endif - st = WTERMSIG(status); - if (sigonly) { - if (st == SIGINT || st == SIGPIPE) - goto out; -#if JOBS - if (WIFSTOPPED(status)) - goto out; -#endif - } - st &= 0x7f; - col = fmtstr(s, 32, strsignal(st)); - if (WCOREDUMP(status)) { - col += fmtstr(s + col, 16, " (core dumped)"); - } - } else if (!sigonly) { - st = WEXITSTATUS(status); - if (st) - col = fmtstr(s, 16, "Done(%d)", st); - else - col = fmtstr(s, 16, "Done"); - } - out: - return col; -} - -/* - * 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. - */ -static int -waitproc(int block, int *status) -{ - int flags = 0; - -#if JOBS - if (jobctl) - flags |= WUNTRACED; -#endif - if (block == 0) - flags |= WNOHANG; - return wait3(status, flags, (struct rusage *)NULL); -} - -/* - * Wait for a process to terminate. - */ -static int -dowait(int block, struct job *job) -{ - int pid; - int status; - struct job *jp; - struct job *thisjob; - int state; - - TRACE(("dowait(%d) called\n", block)); - pid = waitproc(block, &status); - TRACE(("wait returns pid %d, status=%d\n", pid, status)); - if (pid <= 0) - return pid; - INT_OFF; - thisjob = NULL; - 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 - if (!WIFSTOPPED(status)) -#endif - - 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: - INT_ON; - - 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; - out2str(s); - } - } - return pid; -} - -#if JOBS -static void -showjob(FILE *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 */ - fprintf(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) { - strcpy(s + col, "Running"); - col += sizeof("Running") - 1; - } else { - int status = psend[-1].status; - if (jp->state == JOBSTOPPED) - status = jp->stopstatus; - 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: - fprintf(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); - } -} - -static int -jobscmd(int argc, char **argv) -{ - int mode, m; - FILE *out; - - mode = 0; - while ((m = nextopt("lp"))) { - if (m == 'l') - mode = SHOW_PID; - else - mode = SHOW_PGID; - } - - out = stdout; - 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. - */ -static void -showjobs(FILE *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); - } -} -#endif /* JOBS */ - -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; -} - -static int -waitcmd(int argc, char **argv) -{ - struct job *job; - int retval; - struct job *jp; - - EXSIGON; - - 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; - } - dowait(DOWAIT_BLOCK, 0); - } - } - - 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) - dowait(DOWAIT_BLOCK, 0); - job->waited = 1; - retval = getstatus(job); - repeat: - ; - } while (*++argv); - - out: - return retval; -} - -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 (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; -} - -/* - * Return a new job structure. - * Called with interrupts off. - */ -static 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 JOBS - if (jobctl) - continue; -#endif - 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; -} - -#if JOBS -/* - * Return a string identifying a command (to be printed by the - * jobs command). - */ -static char *cmdnextc; - -static void -cmdputs(const char *s) -{ - const char *p, *str; - char c, cc[2] = " "; - char *nextc; - 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 = "${"; - if (!(subtype & VSQUOTE) == !(quoted & 1)) - goto dostr; - quoted ^= 1; - c = '"'; - break; - case CTLENDVAR: - str = "\"}" + !(quoted & 1); - quoted >>= 1; - subtype = 0; - goto dostr; - case CTLBACKQ: - str = "$(...)"; - goto dostr; - case CTLBACKQ+CTLQUOTE: - str = "\"$(...)\""; - goto dostr; -#if ENABLE_ASH_MATH_SUPPORT - case CTLARI: - str = "$(("; - goto dostr; - case CTLENDARI: - str = "))"; - goto dostr; -#endif - 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; -} - -/* cmdtxt() and cmdlist() call each other */ -static void cmdtxt(union node *n); - -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 -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 "); - n = n->nif.ifpart; - if (n->nif.elsepart) { - cmdtxt(n); - cmdputs("; else "); - n = n->nif.elsepart; - } - 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->narg.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; - } - n = n->nfile.fname; - goto donode; - } -} - -static char * -commandtext(union node *n) -{ - char *name; - - STARTSTACKSTR(cmdnextc); - cmdtxt(n); - name = stackblock(); - TRACE(("commandtext: name %p, end %p\n\t\"%s\"\n", - name, cmdnextc, cmdnextc)); - return ckstrdup(name); -} -#endif /* JOBS */ - -/* - * 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. - */ -/* - * Clear traps on a fork. - */ -static void -clear_traps(void) -{ - char **tp; - - for (tp = trap; tp < &trap[NSIG]; tp++) { - if (*tp && **tp) { /* trap not NULL or SIG_IGN */ - INT_OFF; - free(*tp); - *tp = NULL; - if (tp != &trap[0]) - setsignal(tp - trap); - INT_ON; - } - } -} -static 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(bb_dev_null, O_RDONLY) != 0) - ash_msg_and_raise_error("Can't open %s", bb_dev_null); - } - } - if (!oldlvl && iflag) { - setsignal(SIGINT); - setsignal(SIGQUIT); - setsignal(SIGTERM); - } - for (jp = curjob; jp; jp = jp->prev_job) - freejob(jp); - jobless = 0; -} - -static 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 */ - 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 JOBS - if (jobctl && n) - ps->cmd = commandtext(n); -#endif - } -} - -static 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); - ash_msg_and_raise_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 - * 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. - * - * Called with interrupts off. - */ -static 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); - } - if (jp->state == JOBDONE) -#endif - freejob(jp); - return st; -} - -/* - * return 1 if there are stopped jobs, otherwise 0 - */ -static 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; -} - - /* ============ mail.c * * Routines to check for mail. @@ -9157,22 +9166,6 @@ setcmd(int argc, char **argv) return 0; } -#if ENABLE_LOCALE_SUPPORT -static void -change_lc_all(const char *value) -{ - if (value && *value != '\0') - setlocale(LC_ALL, value); -} - -static void -change_lc_ctype(const char *value) -{ - if (value && *value != '\0') - setlocale(LC_CTYPE, value); -} -#endif - #if ENABLE_ASH_RANDOM_SUPPORT /* Roughly copied from bash.. */ static void |