Re: [bug #63070] posix_spawn fails to run a child process.

[Edward Welbourne]

Alejandro Colomar (21 September 2022 11:46)
>> If the function is returning 0, there's no error, and errno shouldn't be read

> I guess you maybe didn't state it here as obvious, but to me it's not by
> reading the conversation: Apart from posix_spawn(3) returning 0 and setting
> errno to ENOEXEC, I guess you're seeing something else, such as a child
> returning 127?
>
> If so, I think I understand the problem you're trying to explain.
>
> Otherwise, glibc is allowed to set errno without failing, and you shouldn't be
> reading errno as it's meaningless.

If it's hard to restructure code to avoid something reading errno after
the call, it's of course possible to evaluate

  (posix_spawn(...) || errno = 0)

instead of posix_spawn(...), which won't change the value but will
ensure errno is clear after success.

        Eddy.