return sigprocmask (SIG_SETMASK, &set, NULL);
return __sigprocmask (SIG_SETMASK, &set, NULL);
sigrelse (sig)     int sig;{  sigset_t set;  /* Retrieve current signal set.  */  if (sigprocmask (SIG_SETMASK, NULL, &set) < 0)    return -1;  /* Remove the specified signal.  */  if (sigdelset (&set, sig) < 0)    return -1;  /* Set the new mask.  */  return sigprocmask (SIG_SETMASK, &set, NULL);}