src/system/libroot/posix/arch/generic/setjmp_save_sigs.c

   1 /*
   2  * Copyright 2004, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
   3  * Distributed under the terms of the Haiku License.
   4  */
   5
   6
   7 #include <setjmp.h>
   8
   9
  10 /** This function is called by sigsetjmp() only */
  11
  12 int __setjmp_save_sigs(jmp_buf buffer, int saveMask);
  13
  14 int
  15 __setjmp_save_sigs(jmp_buf buffer, int saveMask)
  16 {
  17         // If the signal mask shall be saved, we save the inverted signal mask. The
  18         // reason for this is that due to unblockable signals the inverted signal
  19         // mask is never zero and thus we can use a zero value to indicate that the
  20         // mask has not been saved.
  21         sigset_t signalMask;
  22         if (saveMask != 0 && sigprocmask(SIG_BLOCK, NULL, &signalMask) == 0)
  23                 buffer[0].inverted_signal_mask = ~signalMask;
  24         else
  25                 buffer[0].inverted_signal_mask = 0;
  26
  27         return 0;
  28 }