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test if posix_spawn works before using it

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broken on QEMU with glibc, for example
This commit is contained in:
Jameson Nash 2026-03-16 17:31:07 -04:00
parent 767226e5c6
commit d34e829333
1 changed files with 25 additions and 0 deletions
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25
src/unix/process.c
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@ -73,6 +73,7 @@ extern char **environ;
static uv_once_t posix_spawn_init_once = UV_ONCE_INIT;
static int posix_spawn_can_use_setsid;
static volatile int posix_spawn_works;
static struct uv__posix_spawn_fncs_s {
struct {
@ -449,6 +450,27 @@ static void uv__spawn_init_can_use_setsid(void) {
static void uv__spawn_init_posix_spawn(void) {
#if !defined(__linux__)
posix_spawn_works = 1;
#elif !defined(__ANDROID__)
pid_t pid;
int status;
/* Probe whether vfork()/clone(CLONE_VM) correctly shares the address space,
* i.e. a write by the child before _exit() is visible to the parent once it
* resumes. On Linux vfork() is equivalent to
* clone(CLONE_VM|CLONE_VFORK|SIGCHLD). On QEMU and WSL1, CLONE_VM is broken,
* resulting in glibc errors if we try to use posix_spawn(). */
posix_spawn_works = 0;
pid = vfork();
if (pid == 0) {
posix_spawn_works = 1;
_exit(0);
}
if (pid > 0)
waitpid(pid, &status, 0);
#endif
/* Try to locate all new functions at runtime.
* Expected on macOS, glibc, and musl. */
posix_spawn_fncs.file_actions.addchdir =
@ -797,6 +819,9 @@ static int uv__spawn_and_init_child_posix_spawn(
posix_spawnattr_t attrs;
posix_spawn_file_actions_t actions;
if (!posix_spawn_works)
return UV_ENOSYS;
err = uv__spawn_set_posix_spawn_attrs(&attrs, options);
if (err != 0)
goto error;