[Bug libc/20375] posix_spawn fails when full signal set passed to posix_spawnattr_setsigdefault and POSIX_SPAWN_SETSIGDEF is set

["adhemerval.zanella at linaro dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20375

--- Comment #3 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
Ok I see now, it fails because this bug is opened against the old posix_spawn
version which does:

sysdeps/posix/spawni.c:

127   /* Set signal default action.  */
128   if ((flags & POSIX_SPAWN_SETSIGDEF) != 0)
129     {
130       /* We have to iterate over all signals.  This could possibly be
131          done better but it requires system specific solutions since
132          the sigset_t data type can be very different on different
133          architectures.  */
134       int sig;
135       struct sigaction sa;
136 
137       memset (&sa, '\0', sizeof (sa));
138       sa.sa_handler = SIG_DFL;
139 
140       for (sig = 1; sig <= _NSIG; ++sig)
141         if (__sigismember (&attrp->__sd, sig) != 0
142             && __sigaction (sig, &sa, NULL) != 0)
143           _exit (SPAWN_ERROR);
144 
145     }

So if sigaction fail it bails out with a failure.

I think this bug is invalid because new posix_spawn implementation does not
have this limitation.

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