On Mar 8, 2012, at 9:28 PM, Caspar Zhang wrote:
>
> in negative case:
>
> QUICK_TEST(sched_getaffinity(getpid()+1, len, mask));
>
> sometimes getpid()+1 will exist if there're other processes running.
> This patch uses a different way to make sure the required pid doesn't
> exist by forking a child and terminating it. The pid of the terminated
> child will not be used for a short time and it's enough for the test to
> continue.
pid_t is signed on FreeBSD and Linux, so it's safe to assume that a pid
of -1 won't work. It all depends on what you're trying to achieve (the EINVAL
or the ESRCH requirement).
Testing to make sure that a pid isn't running via kill(pid, 0) is
another semi-viable method, but it's also racy.
Cheers,
-Garrett
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