Reduce size of saved/restored signal masks.

On glibc, sigset_t has a ridiculous size: one kilobyte!
The kernel doesn't access most of it in the sigprocmask call.
Yet it blows up the size of our dynamic frames quite a lot.

In this commit, we define a small_sigset_t type and
use that instead. We convert to the bloated one when
calling the library.

* signal.c (sig_blocked_cache): Type changes to small_sigset_t.
(sig_reload_cache): Retrieve signal mask with sigprocmask into a local
variable, then copy a small portion from that to sig_blocked_cache.
(small_sigfillset): New static function.
(set_sig_handler): Local variables of sigset_t changed to small_sigset_t.
(sig_mask): Arguments are pointers to small_sigset_t. Conversion to
sigset_t done around the call to sigprocmask.

* signal.h (copy_sigset): Inline funtion removed.
(small_sigset_t): New struct type.
(extended_jmp_buf): Member blocked changed to small_sigset_t.
(extended_setjmp): Cast expression updated with small_sigset_t *.
(extended_longjmp): Use assignment instead of copy_sigset.
(sig_blocked_cache, sig_mask): Declarations updated.

0 files changed, 0 insertions, 0 deletions