sysdeps/unix/sysv/linux/nptl-signals.h

   1 /* Special use of signals in NPTL internals.  Linux version.
   2    Copyright (C) 2014-2016 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <signal.h>
  20
  21 /* The signal used for asynchronous cancelation.  */
  22 #define SIGCANCEL       __SIGRTMIN
  23
  24
  25 /* Signal needed for the kernel-supported POSIX timer implementation.
  26    We can reuse the cancellation signal since we can distinguish
  27    cancellation from timer expirations.  */
  28 #define SIGTIMER        SIGCANCEL
  29
  30
  31 /* Signal used to implement the setuid et.al. functions.  */
  32 #define SIGSETXID       (__SIGRTMIN + 1)
  33
  34
  35 /* Return is sig is used internally.  */
  36 static inline int
  37 __nptl_is_internal_signal (int sig)
  38 {
  39   return (sig == SIGCANCEL) || (sig == SIGTIMER) || (sig == SIGSETXID);
  40 }
  41
  42 /* Used to communicate with signal handler.  */
  43 extern struct xid_command *__xidcmd attribute_hidden;