libiberty/sigsetmask.c

   1 /* Version of sigsetmask.c
   2    Written by Steve Chamberlain (sac@cygnus.com).
   3    Contributed by Cygnus Support.
   4    This file is in the public doamin. */
   5
   6 /*
   7
   8 @deftypefn Supplemental int sigsetmask (int @var{set})
   9
  10 Sets the signal mask to the one provided in @var{set} and returns
  11 the old mask (which, for libiberty's implementation, will always
  12 be the value @code{1}).
  13
  14 @end deftypefn
  15
  16 */
  17
  18 #define _POSIX_SOURCE
  19 #include <ansidecl.h>
  20 /* Including <sys/types.h> seems to be needed by ISC. */
  21 #include <sys/types.h>
  22 #include <signal.h>
  23
  24 extern void abort (void) ATTRIBUTE_NORETURN;
  25
  26 #ifdef SIG_SETMASK
  27 int
  28 sigsetmask (int set)
  29 {
  30     sigset_t new_sig;
  31     sigset_t old_sig;
  32
  33     sigemptyset (&new_sig);
  34     if (set != 0) {
  35       abort();  /* FIXME, we don't know how to translate old mask to new */
  36     }
  37     sigprocmask(SIG_SETMASK, &new_sig, &old_sig);
  38     return 1;   /* FIXME, we always return 1 as old value.  */
  39 }
  40 #endif