Function parse_block_signal_params

src/env.c:633–680

static void
parse_block_signal_params (char const *arg, bool block)
{
  if (! arg)
    {
      /* Without an argument, reset all signals.  */
      sigfillset (block ? &block_signals : &unblock_signals);
      sigemptyset (block ? &unblock_signals : &block_signals);
    }
  else if (! sig_mask_changed)
    {
      /* Initialize the sets.  */
      sigemptyset (&block_signals);
      sigemptyset (&unblock_signals);
    }

  sig_mask_changed = true;

  if (! arg)
    return;

  char *optarg_writable = xstrdup (arg);

  char *opt_sig = strtok (optarg_writable, ",");
  while (opt_sig)
    {
      int signum = operand2sig (opt_sig);
      /* operand2sig accepts signal 0 (EXIT) - but we reject it.  */
      if (signum == 0)
        error (0, 0, _("%s: invalid signal"), quote (opt_sig));
      if (signum <= 0)
        usage (exit_failure);

      if (sigaddset (block ? &block_signals : &unblock_signals, signum) == -1)
        {
          if (block)
            error (EXIT_CANCELED, errno,
                   _("failed to block signal %d"), signum);
          /* else diagnosed in parse_signal_action_params().  */
        }
      else
        sigdelset (block ? &unblock_signals : &block_signals, signum);

      opt_sig = strtok (NULL, ",");
    }

  free (optarg_writable);
}

static void
set_signal_proc_mask (void)