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igt_core: Read manpages more carefully for WNOHANG

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/me hides

I thought it said it would not return for a signal and stopped thinking.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2014-07-24 12:00:57 +01:00
parent 745945546f
commit 66e46630f8
1 changed files with 13 additions and 5 deletions
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18
lib/igt_core.c
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@ -791,16 +791,24 @@ static void reset_helper_process_list(void)
helper_process_count = 0;
}
static int __waitpid(pid_t pid)
{
int status = -1;
while (waitpid(pid, &status, 0) == -1 &&
errno == EINTR)
;
return status;
}
static void fork_helper_exit_handler(int sig)
{
int status;
/* Inside a signal handler, play safe */
for (int i = 0; i < ARRAY_SIZE(helper_process_pids); i++) {
pid_t pid = helper_process_pids[i];
if (pid != -1) {
kill(pid, SIGTERM);
waitpid(pid, &status, WNOHANG);
__waitpid(pid);
helper_process_count--;
}
}
@ -851,11 +859,11 @@ bool __igt_fork_helper(struct igt_helper_process *proc)
*/
int igt_wait_helper(struct igt_helper_process *proc)
{
int status = -1;
int status;
assert(proc->running);
waitpid(proc->pid, &status, WNOHANG);
status = __waitpid(proc->pid);
proc->running = false;