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hush: kill some old unused fields; small code shrink

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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 2008-06-24 00:47:58 +00:00
parent cc3f20b9bd
commit 003f9fb213
1 changed files with 51 additions and 60 deletions
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111
shell/hush.c
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@ -309,16 +309,14 @@ struct child_prog {
struct pipe { struct pipe {
struct pipe *next; struct pipe *next;
int num_progs; /* total number of programs in job */ 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 */ int stopped_progs; /* number of programs alive, but stopped */
#if ENABLE_HUSH_JOB #if ENABLE_HUSH_JOB
int jobid; /* job number */ int jobid; /* job number */
pid_t pgrp; /* process group ID for the job */ pid_t pgrp; /* process group ID for the job */
char *cmdtext; /* name of job */ char *cmdtext; /* name of job */
#endif #endif
char *cmdbuf; /* buffer various argv's point into */
struct child_prog *progs; /* array of commands in pipe */ struct child_prog *progs; /* array of commands in pipe */
int job_context; /* bitmask defining current context */
smallint pi_inverted; /* "! cmd | cmd" */ smallint pi_inverted; /* "! cmd | cmd" */
smallint followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */ smallint followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
smallint res_word; /* needed for if, for, while, until... */ smallint res_word; /* needed for if, for, while, until... */
@ -1564,7 +1562,7 @@ static void remove_bg_job(struct pipe *pi)
last_jobid = 0; last_jobid = 0;
} }
/* remove a backgrounded job */ /* Remove a backgrounded job */
static void delete_finished_bg_job(struct pipe *pi) static void delete_finished_bg_job(struct pipe *pi)
{ {
remove_bg_job(pi); remove_bg_job(pi);
@ -1574,23 +1572,21 @@ static void delete_finished_bg_job(struct pipe *pi)
} }
#endif /* JOB */ #endif /* JOB */
/* Checks to see if any processes have exited -- if they /* Check to see if any processes have exited -- if they
have, figure out why and see if a job has completed */ * have, figure out why and see if a job has completed */
static int checkjobs(struct pipe* fg_pipe) static int checkjobs(struct pipe* fg_pipe)
{ {
int attributes; int attributes;
int status; int status;
#if ENABLE_HUSH_JOB #if ENABLE_HUSH_JOB
int prognum = 0;
struct pipe *pi; struct pipe *pi;
#endif #endif
pid_t childpid; pid_t childpid;
int rcode = 0; int rcode = 0;
attributes = WUNTRACED; attributes = WUNTRACED;
if (fg_pipe == NULL) { if (fg_pipe == NULL)
attributes |= WNOHANG; attributes |= WNOHANG;
}
/* Do we do this right? /* Do we do this right?
* bash-3.00# sleep 20 | false * bash-3.00# sleep 20 | false
@ -1607,8 +1603,8 @@ static int checkjobs(struct pipe* fg_pipe)
wait_more: wait_more:
// TODO: safe_waitpid? // TODO: safe_waitpid?
while ((childpid = waitpid(-1, &status, attributes)) > 0) { while ((childpid = waitpid(-1, &status, attributes)) > 0) {
int i;
const int dead = WIFEXITED(status) || WIFSIGNALED(status); const int dead = WIFEXITED(status) || WIFSIGNALED(status);
#if DEBUG_JOBS #if DEBUG_JOBS
if (WIFSTOPPED(status)) if (WIFSTOPPED(status))
debug_printf_jobs("pid %d stopped by sig %d (exitcode %d)\n", debug_printf_jobs("pid %d stopped by sig %d (exitcode %d)\n",
@ -1622,76 +1618,70 @@ static int checkjobs(struct pipe* fg_pipe)
#endif #endif
/* Were we asked to wait for fg pipe? */ /* Were we asked to wait for fg pipe? */
if (fg_pipe) { if (fg_pipe) {
int i;
for (i = 0; i < fg_pipe->num_progs; i++) { for (i = 0; i < fg_pipe->num_progs; i++) {
debug_printf_jobs("check pid %d\n", fg_pipe->progs[i].pid); debug_printf_jobs("check pid %d\n", fg_pipe->progs[i].pid);
if (fg_pipe->progs[i].pid == childpid) { if (fg_pipe->progs[i].pid != childpid)
/* printf("process %d exit %d\n", i, WEXITSTATUS(status)); */ continue;
if (dead) { /* printf("process %d exit %d\n", i, WEXITSTATUS(status)); */
fg_pipe->progs[i].pid = 0; if (dead) {
fg_pipe->running_progs--; fg_pipe->progs[i].pid = 0;
if (i == fg_pipe->num_progs - 1) { fg_pipe->alive_progs--;
/* last process gives overall exitstatus */ if (i == fg_pipe->num_progs - 1) {
rcode = WEXITSTATUS(status); /* last process gives overall exitstatus */
if (fg_pipe->pi_inverted) rcode = WEXITSTATUS(status);
rcode = !rcode; if (fg_pipe->pi_inverted)
} rcode = !rcode;
} else {
fg_pipe->progs[i].is_stopped = 1;
fg_pipe->stopped_progs++;
} }
debug_printf_jobs("fg_pipe: running_progs %d stopped_progs %d\n", } else {
fg_pipe->running_progs, fg_pipe->stopped_progs); fg_pipe->progs[i].is_stopped = 1;
if (fg_pipe->running_progs - fg_pipe->stopped_progs <= 0) { fg_pipe->stopped_progs++;
/* 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;
} }
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 #if ENABLE_HUSH_JOB
/* We asked to wait for bg or orphaned children */ /* We asked to wait for bg or orphaned children */
/* No need to remember exitcode in this case */ /* No need to remember exitcode in this case */
for (pi = job_list; pi; pi = pi->next) { for (pi = job_list; pi; pi = pi->next) {
prognum = 0; for (i = 0; i < pi->num_progs; i++) {
while (prognum < pi->num_progs) { if (pi->progs[i].pid == childpid)
if (pi->progs[prognum].pid == childpid)
goto found_pi_and_prognum; goto found_pi_and_prognum;
prognum++;
} }
} }
#endif
/* Happens when shell is used as init process (init=/bin/sh) */ /* Happens when shell is used as init process (init=/bin/sh) */
debug_printf("checkjobs: pid %d was not in our list!\n", childpid); 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: found_pi_and_prognum:
if (dead) { if (dead) {
/* child exited */ /* child exited */
pi->progs[prognum].pid = 0; pi->progs[i].pid = 0;
pi->running_progs--; pi->alive_progs--;
if (!pi->running_progs) { if (!pi->alive_progs) {
printf(JOB_STATUS_FORMAT, pi->jobid, printf(JOB_STATUS_FORMAT, pi->jobid,
"Done", pi->cmdtext); "Done", pi->cmdtext);
delete_finished_bg_job(pi); delete_finished_bg_job(pi);
} }
} else { } else {
/* child stopped */ /* child stopped */
pi->progs[i].is_stopped = 1;
pi->stopped_progs++; pi->stopped_progs++;
pi->progs[prognum].is_stopped = 1;
} }
#endif #endif
} } /* while (waitpid succeeds)... */
/* wait found no children or failed */ /* 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 */ /* Job finished, move the shell to the foreground */
p = getpgid(0); /* pgid of our process */ p = getpgid(0); /* pgid of our process */
debug_printf_jobs("fg'ing ourself: getpgid(0)=%d\n", (int)p); debug_printf_jobs("fg'ing ourself: getpgid(0)=%d\n", (int)p);
if (tcsetpgrp(interactive_fd, p) && errno != ENOTTY) tcsetpgrp(interactive_fd, p);
bb_perror_msg("tcsetpgrp-4a"); // if (tcsetpgrp(interactive_fd, p) && errno != ENOTTY)
// bb_perror_msg("tcsetpgrp-4a");
return rcode; return rcode;
} }
#endif #endif
@ -1751,7 +1742,7 @@ static int run_pipe(struct pipe *pi)
#if ENABLE_HUSH_JOB #if ENABLE_HUSH_JOB
pi->pgrp = -1; pi->pgrp = -1;
#endif #endif
pi->running_progs = 1; pi->alive_progs = 1;
pi->stopped_progs = 0; pi->stopped_progs = 0;
/* Check if this is a simple builtin (not part of a pipe). /* 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); set_jobctrl_sighandler(SIG_IGN);
/* Going to fork a child per each pipe member */ /* Going to fork a child per each pipe member */
pi->running_progs = 0; pi->alive_progs = 0;
nextin = 0; nextin = 0;
for (i = 0; i < pi->num_progs; i++) { 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 */ /* Clearly indicate, was it fork or vfork */
bb_perror_msg(BB_MMU ? "fork" : "vfork"); bb_perror_msg(BB_MMU ? "fork" : "vfork");
} else { } else {
pi->running_progs++; pi->alive_progs++;
#if ENABLE_HUSH_JOB #if ENABLE_HUSH_JOB
/* Second and next children need to know pid of first one */ /* Second and next children need to know pid of first one */
if (pi->pgrp < 0) if (pi->pgrp < 0)
@ -1921,12 +1912,12 @@ static int run_pipe(struct pipe *pi)
nextin = pipefds[0]; nextin = pipefds[0];
} }
if (!pi->running_progs) { if (!pi->alive_progs) {
debug_printf_exec("run_pipe return 1 (all forks failed, no children)\n"); debug_printf_exec("run_pipe return 1 (all forks failed, no children)\n");
return 1; 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; return -1;
} }
@ -4205,7 +4196,7 @@ static int builtin_jobs(char **argv ATTRIBUTE_UNUSED)
const char *status_string; const char *status_string;
for (job = job_list; job; job = job->next) { 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"; status_string = "Stopped";
else else
status_string = "Running"; status_string = "Running";