use vfork if possible in posix_spawn

[musl] / src / process / posix_spawn.c

diff --git a/src/process/posix_spawn.c b/src/process/posix_spawn.c
index 9f2d742..604756e 100644 (file)
--- a/src/process/posix_spawn.c
+++ b/src/process/posix_spawn.c
@@ -8,11 +8,13 @@
 
 extern char **environ;
 
-int __posix_spawnx(pid_t *res, const char *path,
+pid_t __vfork(void);
+
+int __posix_spawnx(pid_t *restrict res, const char *restrict path,
        int (*exec)(const char *, char *const *),
        const posix_spawn_file_actions_t *fa,
-       const posix_spawnattr_t *attr,
-       char *const argv[], char *const envp[])
+       const posix_spawnattr_t *restrict attr,
+       char *const argv[restrict], char *const envp[restrict])
 {
        pid_t pid;
        sigset_t oldmask;
@@ -22,7 +24,7 @@ int __posix_spawnx(pid_t *res, const char *path,
        if (!attr) attr = &dummy_attr;
 
        sigprocmask(SIG_BLOCK, (void *)(uint64_t []){-1}, &oldmask);
-       pid = __syscall(SYS_fork);
+       pid = __vfork();
 
        if (pid) {
                sigprocmask(SIG_SETMASK, &oldmask, 0);
@@ -89,10 +91,10 @@ int __posix_spawnx(pid_t *res, const char *path,
        return 0;
 }
 
-int posix_spawn(pid_t *res, const char *path,
+int posix_spawn(pid_t *restrict res, const char *restrict path,
        const posix_spawn_file_actions_t *fa,
-       const posix_spawnattr_t *attr,
-       char *const argv[], char *const envp[])
+       const posix_spawnattr_t *restrict attr,
+       char *const argv[restrict], char *const envp[restrict])
 {
        return __posix_spawnx(res, path, execv, fa, attr, argv, envp);
 }