#if _lib_posix_spawn < 2
if (waitpid(pid, &err, WNOHANG|WNOWAIT) == pid && EXIT_STATUS(err) ==
127)
{
while (waitpid(pid, NiL, 0) == -1 && errno == EINTR);
if (!access(path, X_OK))
errno = ENOEXEC;
pid = -1;
}
#endif
It will fail with EINVAL, because of WNOWAIT. This option is not
supported in waitpid. It's supported only in waitid().
so you'd have to use something like
pid_t pid;
siginfo_t err;
if (!waitid(P_PID, pid, &err, WEXITED|WNOHANG|WNOWAIT) && err.si_status
== 127)
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