diff options
| -rw-r--r-- | shell/ash.c | 122 |
1 files changed, 56 insertions, 66 deletions
diff --git a/shell/ash.c b/shell/ash.c index 2b13786..ff59405 100644 --- a/shell/ash.c +++ b/shell/ash.c @@ -3810,8 +3810,6 @@ static struct job *jobtab; //5 static unsigned njobs; //4 /* current job */ static struct job *curjob; //lots -/* number of presumed living untracked jobs */ -static int jobless; //4 #if 0 /* Bash has a feature: it restores termios after a successful wait for @@ -4331,7 +4329,7 @@ wait_block_or_sig(int *status) #endif static int -dowait(int block, struct job *job) +waitone(int block, struct job *job) { int pid; int status; @@ -4432,10 +4430,6 @@ dowait(int block, struct job *job) goto out; } /* The process wasn't found in job list */ -#if JOBS - if (!WIFSTOPPED(status)) - jobless--; -#endif out: INT_ON; @@ -4460,6 +4454,20 @@ dowait(int block, struct job *job) return pid; } +static int +dowait(int block, struct job *jp) +{ + int pid = block == DOWAIT_NONBLOCK ? got_sigchld : 1; + + while (jp ? jp->state == JOBRUNNING : pid > 0) { + if (!jp) + got_sigchld = 0; + pid = waitone(block, jp); + } + + return pid; +} + #if JOBS static void showjob(struct job *jp, int mode) @@ -4548,8 +4556,7 @@ showjobs(int mode) TRACE(("showjobs(0x%x) called\n", mode)); /* Handle all finished jobs */ - while (dowait(DOWAIT_NONBLOCK, NULL) > 0) - continue; + dowait(DOWAIT_NONBLOCK, NULL); for (jp = curjob; jp; jp = jp->prev_job) { if (!(mode & SHOW_CHANGED) || jp->changed) { @@ -4666,10 +4673,10 @@ waitcmd(int argc UNUSED_PARAM, char **argv) #else dowait(DOWAIT_BLOCK_OR_SIG, NULL); #endif - /* if child sends us a signal *and immediately exits*, - * dowait() returns pid > 0. Check this case, - * not "if (dowait() < 0)"! - */ + /* if child sends us a signal *and immediately exits*, + * dowait() returns pid > 0. Check this case, + * not "if (dowait() < 0)"! + */ if (pending_sig) goto sigout; #if BASH_WAIT_N @@ -4705,11 +4712,9 @@ waitcmd(int argc UNUSED_PARAM, char **argv) job = getjob(*argv, 0); } /* loop until process terminated or stopped */ - while (job->state == JOBRUNNING) { - dowait(DOWAIT_BLOCK_OR_SIG, NULL); - if (pending_sig) - goto sigout; - } + dowait(DOWAIT_BLOCK_OR_SIG, NULL); + if (pending_sig) + goto sigout; job->waited = 1; retval = getstatus(job); repeat: ; @@ -5261,7 +5266,6 @@ forkchild(struct job *jp, union node *n, int mode) #endif for (jp = curjob; jp; jp = jp->prev_job) freejob(jp); - jobless = 0; } /* Called after fork(), in parent */ @@ -5272,13 +5276,8 @@ static void forkparent(struct job *jp, union node *n, int mode, pid_t pid) { TRACE(("In parent shell: child = %d\n", pid)); - if (!jp) { - /* jp is NULL when called by openhere() for heredoc support */ - while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0) - continue; - jobless++; + if (!jp) /* jp is NULL when called by openhere() for heredoc support */ return; - } #if JOBS if (mode != FORK_NOJOB && jp->jobctl) { int pgrp; @@ -5357,48 +5356,39 @@ waitforjob(struct job *jp) TRACE(("waitforjob(%%%d) called\n", jp ? jobno(jp) : 0)); - if (!jp) { - int pid = got_sigchld; - - while (pid > 0) - pid = dowait(DOWAIT_NONBLOCK, NULL); - + /* In non-interactive shells, we _can_ get + * a keyboard signal here and be EINTRed, but we just loop + * inside dowait(), waiting for command to complete. + * + * man bash: + * "If bash is waiting for a command to complete and receives + * a signal for which a trap has been set, the trap + * will not be executed until the command completes." + * + * Reality is that even if trap is not set, bash + * will not act on the signal until command completes. + * Try this. sleep5intoff.c: + * #include <signal.h> + * #include <unistd.h> + * int main() { + * sigset_t set; + * sigemptyset(&set); + * sigaddset(&set, SIGINT); + * sigaddset(&set, SIGQUIT); + * sigprocmask(SIG_BLOCK, &set, NULL); + * sleep(5); + * return 0; + * } + * $ bash -c './sleep5intoff; echo hi' + * ^C^C^C^C <--- pressing ^C once a second + * $ _ + * $ bash -c './sleep5intoff; echo hi' + * ^\^\^\^\hi <--- pressing ^\ (SIGQUIT) + * $ _ + */ + dowait(jp ? DOWAIT_BLOCK : DOWAIT_NONBLOCK, jp); + if (!jp) return exitstatus; - } - - while (jp->state == JOBRUNNING) { - /* In non-interactive shells, we _can_ get - * a keyboard signal here and be EINTRed, - * but we just loop back, waiting for command to complete. - * - * man bash: - * "If bash is waiting for a command to complete and receives - * a signal for which a trap has been set, the trap - * will not be executed until the command completes." - * - * Reality is that even if trap is not set, bash - * will not act on the signal until command completes. - * Try this. sleep5intoff.c: - * #include <signal.h> - * #include <unistd.h> - * int main() { - * sigset_t set; - * sigemptyset(&set); - * sigaddset(&set, SIGINT); - * sigaddset(&set, SIGQUIT); - * sigprocmask(SIG_BLOCK, &set, NULL); - * sleep(5); - * return 0; - * } - * $ bash -c './sleep5intoff; echo hi' - * ^C^C^C^C <--- pressing ^C once a second - * $ _ - * $ bash -c './sleep5intoff; echo hi' - * ^\^\^\^\hi <--- pressing ^\ (SIGQUIT) - * $ _ - */ - dowait(DOWAIT_BLOCK, jp); - } st = getstatus(jp); #if JOBS |