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use vfork if possible in posix_spawn

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vfork is implemented as the fork syscall (with no atfork handlers run)
on archs where it is not available, so this change does not introduce
any change in behavior or regression for such archs.
This commit is contained in:
Rich Felker
2012-09-14 15:32:51 -04:00
parent e2f6a3257e
commit d62f4e9888
1 changed files with 3 additions and 1 deletions
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4
src/process/posix_spawn.c
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@ -8,6 +8,8 @@
extern char **environ; extern char **environ;
pid_t __vfork(void);
int __posix_spawnx(pid_t *restrict res, const char *restrict path, int __posix_spawnx(pid_t *restrict res, const char *restrict path,
int (*exec)(const char *, char *const *), int (*exec)(const char *, char *const *),
const posix_spawn_file_actions_t *fa, const posix_spawn_file_actions_t *fa,
@ -22,7 +24,7 @@ int __posix_spawnx(pid_t *restrict res, const char *restrict path,
if (!attr) attr = &dummy_attr; if (!attr) attr = &dummy_attr;
sigprocmask(SIG_BLOCK, (void *)(uint64_t []){-1}, &oldmask); sigprocmask(SIG_BLOCK, (void *)(uint64_t []){-1}, &oldmask);
pid = __syscall(SYS_fork); pid = __vfork();
if (pid) { if (pid) {
sigprocmask(SIG_SETMASK, &oldmask, 0); sigprocmask(SIG_SETMASK, &oldmask, 0);