initial implementation of posix_spawn

[musl] / src / process / posix_spawn.c

diff --git a/src/process/posix_spawn.c b/src/process/posix_spawn.c
new file mode 100644 (file)
index 0000000..e718cee
--- /dev/null
+++ b/src/process/posix_spawn.c
@@ -0,0 +1,65 @@
+#include <spawn.h>
+#include <unistd.h>
+#include <signal.h>
+#include <stdint.h>
+#include "syscall.h"
+
+extern char **environ;
+
+int __posix_spawnx(pid_t *res, const char *path,
+       int (*exec)(const char *, char *const *),
+       const posix_spawn_file_actions_t *fa,
+       const posix_spawnattr_t *attr, char **argv, char **envp)
+{
+       pid_t pid;
+       sigset_t oldmask;
+       int i;
+       posix_spawnattr_t dummy_attr = { 0 };
+
+       if (!attr) attr = &dummy_attr;
+
+       sigprocmask(SIG_BLOCK, (void *)(uint64_t []){-1}, &oldmask);
+       pid = __syscall(SYS_fork);
+
+       if (pid) {
+               sigprocmask(SIG_SETMASK, &oldmask, 0);
+               if (pid < 0) return -pid;
+               *res = pid;
+               return 0;
+       }
+
+       for (i=1; i<=64; i++) {
+               struct sigaction sa;
+               sigaction(i, 0, &sa);
+               if (sa.sa_handler!=SIG_IGN || sigismember(&attr->__def, i)) {
+                       sa.sa_handler = SIG_DFL;
+                       sigaction(i, &sa, 0);
+               }
+       }
+
+       if ((attr->__flags&POSIX_SPAWN_SETPGROUP) && setpgid(0, attr->__pgrp))
+               _exit(127);
+
+       /* Use syscalls directly because pthread state is not consistent
+        * for making calls to the library wrappers... */
+       if ((attr->__flags&POSIX_SPAWN_RESETIDS) && (
+               __syscall(SYS_setgid, __syscall(SYS_getgid)) ||
+               __syscall(SYS_setuid, __syscall(SYS_getuid)) ))
+               _exit(127);
+
+       sigprocmask(SIG_SETMASK, (attr->__flags & POSIX_SPAWN_SETSIGMASK)
+               ? &attr->__mask : &oldmask, 0);
+
+       if (envp) environ = envp;
+       exec(path, argv);
+       _exit(127);
+
+       return 0;
+}
+
+int posix_spawn(pid_t *res, const char *path,
+       const posix_spawn_file_actions_t *fa,
+       const posix_spawnattr_t *attr, char **argv, char **envp)
+{
+       return __posix_spawnx(res, path, execv, fa, attr, argv, envp);
+}