libc/sysdeps/linux/common/bits/sigaction.h

   1 /* The proper definitions for Linux's sigaction.
   2    Copyright (C) 1993-1999, 2000 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 #ifndef _SIGNAL_H
  20 # error "Never include <bits/sigaction.h> directly; use <signal.h> instead."
  21 #endif
  22
  23 /* Structure describing the action to be taken when a signal arrives.
  24  * In uclibc, it is identical to "new" struct kernel_sigaction
  25  * (one from the Linux 2.1.68 kernel).
  26  * This minimizes amount of translation in sigaction().
  27  */
  28 struct sigaction {
  29 #ifdef __USE_POSIX199309
  30         union {
  31                 __sighandler_t sa_handler;
  32                 void (*sa_sigaction)(int, siginfo_t *, void *);
  33         } __sigaction_handler;
  34 # define sa_handler     __sigaction_handler.sa_handler
  35 # define sa_sigaction   __sigaction_handler.sa_sigaction
  36 #else
  37         __sighandler_t  sa_handler;
  38 #endif
  39         unsigned long   sa_flags;
  40         void            (*sa_restorer)(void);
  41         sigset_t        sa_mask;
  42 };
  43
  44 /* Bits in `sa_flags'.  */
  45 #define SA_NOCLDSTOP  1          /* Don't send SIGCHLD when children stop.  */
  46 #define SA_NOCLDWAIT  2          /* Don't create zombie on child death.  */
  47 #define SA_SIGINFO    4          /* Invoke signal-catching function with
  48                                     three arguments instead of one.  */
  49 #if defined __USE_UNIX98 || defined __USE_MISC
  50 # define SA_ONSTACK   0x08000000 /* Use signal stack by using `sa_restorer'. */
  51 # define SA_RESTART   0x10000000 /* Restart syscall on signal return.  */
  52 # define SA_NODEFER   0x40000000 /* Don't automatically block the signal when
  53                                     its handler is being executed.  */
  54 # define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler.  */
  55 #endif
  56 #ifdef __USE_MISC
  57 # define SA_INTERRUPT 0x20000000 /* Historical no-op.  */
  58
  59 /* Some aliases for the SA_ constants.  */
  60 # define SA_NOMASK    SA_NODEFER
  61 # define SA_ONESHOT   SA_RESETHAND
  62 # define SA_STACK     SA_ONSTACK
  63 #endif
  64
  65 /* Values for the HOW argument to `sigprocmask'.  */
  66 #define SIG_BLOCK     0          /* Block signals.  */
  67 #define SIG_UNBLOCK   1          /* Unblock signals.  */
  68 #define SIG_SETMASK   2          /* Set the set of blocked signals.  */