emo/busybox
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

ash: return to DOWAIT_* constants similar to dash, no logic changes

Browse Source 
This loses an insignificant optimization, but may allow backporting
of some recent-ish dash fixes.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2016-10-27 20:08:28 +02:00
parent 3f44a6be58
commit b543bdadb3
1 changed files with 16 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
shell/ash.c
View File

@@ -3512,8 +3512,8 @@ setsignal(int signo)
#define CUR_STOPPED 0
/* mode flags for dowait */
#define DOWAIT_NONBLOCK WNOHANG
#define DOWAIT_BLOCK 0
#define DOWAIT_NONBLOCK 0
#define DOWAIT_BLOCK 1
#if JOBS
/* pgrp of shell on invocation */
@@ -3935,18 +3935,23 @@ sprint_status48(char *s, int status, int sigonly)
}
static int
dowait(int wait_flags, struct job *job)
dowait(int block, struct job *job)
{
int wait_flags;
int pid;
int status;
struct job *jp;
struct job *thisjob;
TRACE(("dowait(0x%x) called\n", wait_flags));
TRACE(("dowait(0x%x) called\n", block));
/* Do a wait system call. If job control is compiled in, we accept
* stopped processes. wait_flags may have WNOHANG, preventing blocking.
* NB: _not_ safe_waitpid, we need to detect EINTR */
* stopped processes.
* NB: _not_ safe_waitpid, we need to detect EINTR.
*/
wait_flags = 0;
if (block == DOWAIT_NONBLOCK)
wait_flags = WNOHANG;
if (doing_jobctl)
wait_flags |= WUNTRACED;
pid = waitpid(-1, &status, wait_flags);
@@ -4028,7 +4033,7 @@ dowait(int wait_flags, struct job *job)
}
static int
blocking_wait_with_raise_on_sig(void)
blocking_dowait_with_raise_on_sig(void)
{
pid_t pid = dowait(DOWAIT_BLOCK, NULL);
if (pid <= 0 && pending_sig)
@@ -4224,7 +4229,7 @@ waitcmd(int argc UNUSED_PARAM, char **argv)
jp->waited = 1;
jp = jp->prev_job;
}
blocking_wait_with_raise_on_sig();
blocking_dowait_with_raise_on_sig();
/* man bash:
* "When bash is waiting for an asynchronous command via
* the wait builtin, the reception of a signal for which a trap
@@ -4232,10 +4237,10 @@ waitcmd(int argc UNUSED_PARAM, char **argv)
* with an exit status greater than 128, immediately after which
* the trap is executed."
*
* blocking_wait_with_raise_on_sig raises signal handlers
* blocking_dowait_with_raise_on_sig raises signal handlers
* if it gets no pid (pid < 0). However,
* if child sends us a signal *and immediately exits*,
* blocking_wait_with_raise_on_sig gets pid > 0
* blocking_dowait_with_raise_on_sig gets pid > 0
* and does not handle pending_sig. Check this case: */
if (pending_sig)
raise_exception(EXSIG);
@@ -4259,7 +4264,7 @@ waitcmd(int argc UNUSED_PARAM, char **argv)
}
/* loop until process terminated or stopped */
while (job->state == JOBRUNNING)
blocking_wait_with_raise_on_sig();
blocking_dowait_with_raise_on_sig();
job->waited = 1;
retval = getstatus(job);
repeat: ;