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glibc  2.9
sigaction.h
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00001 /* Definitions for Linux/ia64 sigaction.
00002    Copyright (C) 1996, 1997, 2000, 2003 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #ifndef _SIGNAL_H
00021 # error "Never include <bits/sigaction.h> directly; use <signal.h> instead."
00022 #endif
00023 
00024 /* Structure describing the action to be taken when a signal arrives.  */
00025 struct sigaction
00026   {
00027     /* Signal handler.  */
00028 #ifdef __USE_POSIX199309
00029     union
00030       {
00031        /* Used if SA_SIGINFO is not set.  */
00032        __sighandler_t sa_handler;
00033        /* Used if SA_SIGINFO is set.  */
00034        void (*sa_sigaction) (int, siginfo_t *, void *);
00035       }
00036     __sigaction_handler;
00037 # define sa_handler  __sigaction_handler.sa_handler
00038 # define sa_sigaction       __sigaction_handler.sa_sigaction
00039 #else
00040     __sighandler_t sa_handler;
00041 #endif
00042 
00043     /* Special flags.  */
00044     unsigned long int sa_flags;
00045 
00046     /* Additional set of signals to be blocked.  */
00047     __sigset_t sa_mask;
00048   };
00049 
00050 /* Bits in `sa_flags'.  */
00051 #define SA_NOCLDSTOP  0x00000001 /* Don't send SIGCHLD when children stop.  */
00052 #define SA_NOCLDWAIT  0x00000002 /* Don't create zombie on child death.  */
00053 #define SA_SIGINFO    0x00000004
00054 #if defined __USE_UNIX98 || defined __USE_MISC
00055 # define SA_ONSTACK   0x08000000 /* Use signal stack by using `sa_restorer'. */
00056 # define SA_RESTART   0x10000000 /* Restart syscall on signal return.  */
00057 # define SA_NODEFER   0x40000000 /* Don't automatically block the signal
00058                                 when its handler is being executed.  */
00059 # define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler.  */
00060 #endif
00061 #ifdef __USE_MISC
00062 # define SA_INTERRUPT 0x20000000 /* Historic no-op.  */
00063 
00064 /* Some aliases for the SA_ constants.  */
00065 # define SA_NOMASK    SA_NODEFER
00066 # define SA_ONESHOT   SA_RESETHAND
00067 # define SA_STACK     SA_ONSTACK
00068 #endif
00069 
00070 /* Values for the HOW argument to `sigprocmask'.  */
00071 #define SIG_BLOCK          0       /* for blocking signals */
00072 #define SIG_UNBLOCK        1       /* for unblocking signals */
00073 #define SIG_SETMASK        2       /* for setting the signal mask */