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ash: code readability enhancements, no real code changes

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This commit is contained in:
Denis Vlasenko 2008-01-29 09:23:49 +00:00
parent ddd42cb064
commit 36fc3cd8bc
1 changed files with 25 additions and 31 deletions
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56
shell/ash.c
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@ -229,7 +229,7 @@ static struct globals_misc *const ptr_to_globals_misc __attribute__ ((section ("
/*
* These macros allow the user to suspend the handling of interrupt signals
* over a period of time. This is similar to SIGHOLD to or sigblock, but
* over a period of time. This is similar to SIGHOLD or to sigblock, but
* much more efficient and portable. (But hacking the kernel is so much
* more fun than worrying about efficiency and portability. :-))
*/
@ -272,10 +272,10 @@ raise_interrupt(void)
sigset_t mask;
intpending = 0;
/* Signal is not automatically re-enabled after it is raised,
* do it ourself */
/* Signal is not automatically unmasked after it is raised,
* do it ourself - unmask all signals */
sigemptyset(&mask);
sigprocmask(SIG_SETMASK, &mask, 0);
sigprocmask(SIG_SETMASK, &mask, NULL);
/* pendingsig = 0; - now done in onsig() */
i = EXSIG;
@ -3337,8 +3337,8 @@ setsignal(int signo)
#define CUR_STOPPED 0
/* mode flags for dowait */
#define DOWAIT_NORMAL 0
#define DOWAIT_BLOCK 1
#define DOWAIT_NONBLOCK WNOHANG
#define DOWAIT_BLOCK 0
#if JOBS
/* pgrp of shell on invocation */
@ -3584,7 +3584,7 @@ setjobctl(int on)
fd = ttyfd;
pgrp = initialpgrp;
/* was xtcsetpgrp, but this can make exiting ash
* with pty already deleted loop forever */
* loop forever if pty is already deleted */
tcsetpgrp(fd, pgrp);
setpgid(0, pgrp);
setsignal(SIGTSTP);
@ -3757,24 +3757,20 @@ sprint_status(char *s, int status, int sigonly)
* and the jobs command may give out of date information.
*/
static int
waitproc(int block, int *status)
waitproc(int wait_flags, int *status)
{
int flags = 0;
#if JOBS
if (jobctl)
flags |= WUNTRACED;
wait_flags |= WUNTRACED;
#endif
if (block == 0)
flags |= WNOHANG;
return waitpid(-1, status, flags); // safe_waitpid?
return waitpid(-1, status, wait_flags); // safe_waitpid?
}
/*
* Wait for a process to terminate.
*/
static int
dowait(int block, struct job *job)
dowait(int wait_flags, struct job *job)
{
int pid;
int status;
@ -3782,9 +3778,9 @@ dowait(int block, struct job *job)
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));
TRACE(("dowait(%d) called\n", wait_flags));
pid = waitproc(wait_flags, &status);
TRACE(("wait returns pid=%d, status=%d\n", pid, status));
if (pid <= 0)
return pid;
INT_OFF;
@ -3822,7 +3818,6 @@ dowait(int block, struct job *job)
#if JOBS
if (!WIFSTOPPED(status))
#endif
jobless--;
goto out;
@ -3852,7 +3847,7 @@ dowait(int block, struct job *job)
len = sprint_status(s, status, 1);
if (len) {
s[len] = '\n';
s[len + 1] = 0;
s[len + 1] = '\0';
out2str(s);
}
}
@ -3938,8 +3933,8 @@ showjobs(FILE *out, int mode)
TRACE(("showjobs(%x) called\n", mode));
/* If not even one one job changed, there is nothing to do */
while (dowait(DOWAIT_NORMAL, NULL) > 0)
/* If not even one job changed, there is nothing to do */
while (dowait(DOWAIT_NONBLOCK, NULL) > 0)
continue;
for (jp = curjob; jp; jp = jp->prev_job) {
@ -4029,7 +4024,7 @@ waitcmd(int argc, char **argv)
jp->waited = 1;
jp = jp->prev_job;
}
dowait(DOWAIT_BLOCK, 0);
dowait(DOWAIT_BLOCK, NULL);
}
}
@ -4038,20 +4033,18 @@ waitcmd(int argc, char **argv)
if (**argv != '%') {
pid_t pid = number(*argv);
job = curjob;
goto start;
do {
while (1) {
if (!job)
goto repeat;
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);
dowait(DOWAIT_BLOCK, NULL);
job->waited = 1;
retval = getstatus(job);
repeat:
@ -4526,7 +4519,8 @@ 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);
while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0)
continue;
jobless++;
return;
}