hush: kill some old unused fields; small code shrink
function old new delta builtin_exit 48 47 -1 checkjobs 351 335 -16 checkjobs_and_fg_shell 60 35 -25 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/3 up/down: 0/-42) Total: -42 bytes
This commit is contained in:
Denis Vlasenko
parent
cc3f20b9bd
commit
003f9fb213
111
shell/hush.c
111
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 */
|
||||
#if ENABLE_HUSH_JOB
|
||||
if (fg_pipe->running_progs)
|
||||
insert_bg_job(fg_pipe);
|
||||
#endif
|
||||
return rcode;
|
||||
}
|
||||
/* There are still running processes in the fg pipe */
|
||||
goto wait_more;
|
||||
} 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->alive_progs)
|
||||
insert_bg_job(fg_pipe);
|
||||
#endif
|
||||
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";
|
||||
|
||||
Loading…
Reference in New Issue
Block a user