fix missing errno from exec failure in posix_spawn

failures prior to the exec attempt were reported correctly, but on
exec failure, the return value contained junk.

diff --git a/src/process/posix_spawn.c b/src/process/posix_spawn.c
index 68cf795..c688652 100644 (file)
--- a/src/process/posix_spawn.c
+++ b/src/process/posix_spawn.c
@@ -105,6 +105,7 @@ static int child(void *args_vp)
                ? &attr->__mask : &args->oldmask, 0);
 
        args->exec(args->path, args->argv, args->envp);
+       ret = -errno;
 
 fail:
        /* Since sizeof errno < PIPE_BUF, the write is atomic. */