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-rw-r--r--shell/hush.c107
1 files changed, 49 insertions, 58 deletions
diff --git a/shell/hush.c b/shell/hush.c
index 01c9dc8..b59f679 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -309,16 +309,14 @@ struct child_prog {
struct pipe {
struct pipe *next;
int num_progs; /* total number of programs in job */
- int running_progs; /* number of programs running (not exited) */
+ int alive_progs; /* number of programs running (not exited) */
int stopped_progs; /* number of programs alive, but stopped */
#if ENABLE_HUSH_JOB
int jobid; /* job number */
pid_t pgrp; /* process group ID for the job */
char *cmdtext; /* name of job */
#endif
- char *cmdbuf; /* buffer various argv's point into */
struct child_prog *progs; /* array of commands in pipe */
- int job_context; /* bitmask defining current context */
smallint pi_inverted; /* "! cmd | cmd" */
smallint followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
smallint res_word; /* needed for if, for, while, until... */
@@ -1564,7 +1562,7 @@ static void remove_bg_job(struct pipe *pi)
last_jobid = 0;
}
-/* remove a backgrounded job */
+/* Remove a backgrounded job */
static void delete_finished_bg_job(struct pipe *pi)
{
remove_bg_job(pi);
@@ -1574,23 +1572,21 @@ static void delete_finished_bg_job(struct pipe *pi)
}
#endif /* JOB */
-/* Checks to see if any processes have exited -- if they
- have, figure out why and see if a job has completed */
+/* Check to see if any processes have exited -- if they
+ * have, figure out why and see if a job has completed */
static int checkjobs(struct pipe* fg_pipe)
{
int attributes;
int status;
#if ENABLE_HUSH_JOB
- int prognum = 0;
struct pipe *pi;
#endif
pid_t childpid;
int rcode = 0;
attributes = WUNTRACED;
- if (fg_pipe == NULL) {
+ if (fg_pipe == NULL)
attributes |= WNOHANG;
- }
/* Do we do this right?
* bash-3.00# sleep 20 | false
@@ -1607,8 +1603,8 @@ static int checkjobs(struct pipe* fg_pipe)
wait_more:
// TODO: safe_waitpid?
while ((childpid = waitpid(-1, &status, attributes)) > 0) {
+ int i;
const int dead = WIFEXITED(status) || WIFSIGNALED(status);
-
#if DEBUG_JOBS
if (WIFSTOPPED(status))
debug_printf_jobs("pid %d stopped by sig %d (exitcode %d)\n",
@@ -1622,76 +1618,70 @@ static int checkjobs(struct pipe* fg_pipe)
#endif
/* Were we asked to wait for fg pipe? */
if (fg_pipe) {
- int i;
for (i = 0; i < fg_pipe->num_progs; i++) {
debug_printf_jobs("check pid %d\n", fg_pipe->progs[i].pid);
- if (fg_pipe->progs[i].pid == childpid) {
- /* printf("process %d exit %d\n", i, WEXITSTATUS(status)); */
- if (dead) {
- fg_pipe->progs[i].pid = 0;
- fg_pipe->running_progs--;
- if (i == fg_pipe->num_progs - 1) {
- /* last process gives overall exitstatus */
- rcode = WEXITSTATUS(status);
- if (fg_pipe->pi_inverted)
- rcode = !rcode;
- }
- } else {
- fg_pipe->progs[i].is_stopped = 1;
- fg_pipe->stopped_progs++;
+ if (fg_pipe->progs[i].pid != childpid)
+ continue;
+ /* printf("process %d exit %d\n", i, WEXITSTATUS(status)); */
+ if (dead) {
+ fg_pipe->progs[i].pid = 0;
+ fg_pipe->alive_progs--;
+ if (i == fg_pipe->num_progs - 1) {
+ /* last process gives overall exitstatus */
+ rcode = WEXITSTATUS(status);
+ if (fg_pipe->pi_inverted)
+ rcode = !rcode;
}
- debug_printf_jobs("fg_pipe: running_progs %d stopped_progs %d\n",
- fg_pipe->running_progs, fg_pipe->stopped_progs);
- if (fg_pipe->running_progs - fg_pipe->stopped_progs <= 0) {
- /* All processes in fg pipe have exited/stopped */
+ } else {
+ fg_pipe->progs[i].is_stopped = 1;
+ fg_pipe->stopped_progs++;
+ }
+ debug_printf_jobs("fg_pipe: alive_progs %d stopped_progs %d\n",
+ fg_pipe->alive_progs, fg_pipe->stopped_progs);
+ if (fg_pipe->alive_progs - fg_pipe->stopped_progs <= 0) {
+ /* All processes in fg pipe have exited/stopped */
#if ENABLE_HUSH_JOB
- if (fg_pipe->running_progs)
- insert_bg_job(fg_pipe);
+ if (fg_pipe->alive_progs)
+ insert_bg_job(fg_pipe);
#endif
- return rcode;
- }
- /* There are still running processes in the fg pipe */
- goto wait_more;
+ return rcode;
}
+ /* There are still running processes in the fg pipe */
+ goto wait_more; /* do waitpid again */
}
- /* fall through to searching process in bg pipes */
+ /* it wasnt fg_pipe, look for process in bg pipes */
}
#if ENABLE_HUSH_JOB
/* We asked to wait for bg or orphaned children */
/* No need to remember exitcode in this case */
for (pi = job_list; pi; pi = pi->next) {
- prognum = 0;
- while (prognum < pi->num_progs) {
- if (pi->progs[prognum].pid == childpid)
+ for (i = 0; i < pi->num_progs; i++) {
+ if (pi->progs[i].pid == childpid)
goto found_pi_and_prognum;
- prognum++;
}
}
-#endif
-
/* Happens when shell is used as init process (init=/bin/sh) */
debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
- goto wait_more;
+ continue; /* do waitpid again */
-#if ENABLE_HUSH_JOB
found_pi_and_prognum:
if (dead) {
/* child exited */
- pi->progs[prognum].pid = 0;
- pi->running_progs--;
- if (!pi->running_progs) {
+ pi->progs[i].pid = 0;
+ pi->alive_progs--;
+ if (!pi->alive_progs) {
printf(JOB_STATUS_FORMAT, pi->jobid,
- "Done", pi->cmdtext);
+ "Done", pi->cmdtext);
delete_finished_bg_job(pi);
}
} else {
/* child stopped */
+ pi->progs[i].is_stopped = 1;
pi->stopped_progs++;
- pi->progs[prognum].is_stopped = 1;
}
#endif
- }
+ } /* while (waitpid succeeds)... */
/* wait found no children or failed */
@@ -1708,8 +1698,9 @@ static int checkjobs_and_fg_shell(struct pipe* fg_pipe)
/* Job finished, move the shell to the foreground */
p = getpgid(0); /* pgid of our process */
debug_printf_jobs("fg'ing ourself: getpgid(0)=%d\n", (int)p);
- if (tcsetpgrp(interactive_fd, p) && errno != ENOTTY)
- bb_perror_msg("tcsetpgrp-4a");
+ tcsetpgrp(interactive_fd, p);
+// if (tcsetpgrp(interactive_fd, p) && errno != ENOTTY)
+// bb_perror_msg("tcsetpgrp-4a");
return rcode;
}
#endif
@@ -1751,7 +1742,7 @@ static int run_pipe(struct pipe *pi)
#if ENABLE_HUSH_JOB
pi->pgrp = -1;
#endif
- pi->running_progs = 1;
+ pi->alive_progs = 1;
pi->stopped_progs = 0;
/* Check if this is a simple builtin (not part of a pipe).
@@ -1841,7 +1832,7 @@ static int run_pipe(struct pipe *pi)
set_jobctrl_sighandler(SIG_IGN);
/* Going to fork a child per each pipe member */
- pi->running_progs = 0;
+ pi->alive_progs = 0;
nextin = 0;
for (i = 0; i < pi->num_progs; i++) {
@@ -1905,7 +1896,7 @@ static int run_pipe(struct pipe *pi)
/* Clearly indicate, was it fork or vfork */
bb_perror_msg(BB_MMU ? "fork" : "vfork");
} else {
- pi->running_progs++;
+ pi->alive_progs++;
#if ENABLE_HUSH_JOB
/* Second and next children need to know pid of first one */
if (pi->pgrp < 0)
@@ -1921,12 +1912,12 @@ static int run_pipe(struct pipe *pi)
nextin = pipefds[0];
}
- if (!pi->running_progs) {
+ if (!pi->alive_progs) {
debug_printf_exec("run_pipe return 1 (all forks failed, no children)\n");
return 1;
}
- debug_printf_exec("run_pipe return -1 (%u children started)\n", pi->running_progs);
+ debug_printf_exec("run_pipe return -1 (%u children started)\n", pi->alive_progs);
return -1;
}
@@ -4205,7 +4196,7 @@ static int builtin_jobs(char **argv ATTRIBUTE_UNUSED)
const char *status_string;
for (job = job_list; job; job = job->next) {
- if (job->running_progs == job->stopped_progs)
+ if (job->alive_progs == job->stopped_progs)
status_string = "Stopped";
else
status_string = "Running";
generated by cgit v1.1 at 2024-12-26 19:16:12 +0000