pthread_sigmask bug

[Eric Blake]

The current implementation of pthread_sigmask violates POSIX:

extern "C" int
pthread_sigmask (int operation, const sigset_t *set, sigset_t *old_set)
{
  return handle_sigprocmask (operation, set, old_set, _my_tls.sigmask);
}

POSIX requires that sigprocmask returns -1 and sets errno on failure,
but that pthread_sigmask returns a positive error value on failure (and
for QoI leaves errno untouched).

http://pubs.opengroup.org/onlinepubs/9699919799/functions/sigprocmask.html

-- 
Eric Blake   eblake@redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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