Back to index

glibc  2.9
sigaction.h
Go to the documentation of this file.
00001 /* The proper definitions for AIX's sigaction.
00002    Copyright (C) 1993-1999, 2000 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     /* Additional set of signals to be blocked.  */
00044     __sigset_t sa_mask;
00045 
00046     /* Special flags.  */
00047     int sa_flags;
00048   };
00049 
00050 /* Bits in `sa_flags'.  */
00051 #define       SA_NOCLDSTOP  4              /* Don't send SIGCHLD when children stop.  */
00052 #define SA_NOCLDWAIT  0x400  /* Don't create on death of child.  */
00053 #define SA_SIGINFO    0x100  /* Invoke signal-catching function with
00054                                 three arguments instead of one.  */
00055 #if defined __USE_UNIX98 || defined __USE_MISC
00056 # define SA_ONSTACK   0x00000001 /* Use signal stack by using `sa_restorer'. */
00057 # define SA_RESTART   0x00000008 /* Restart syscall on signal return.  */
00058 # define SA_NODEFER   0x00000200 /* Don't automatically block the signal when
00059                                 its handler is being executed.  */
00060 # define SA_RESETHAND 0x00000002 /* Reset to SIG_DFL on entry to handler.  */
00061 #endif
00062 #ifdef __USE_MISC
00063 /* Some aliases for the SA_ constants.  */
00064 # define SA_NOMASK    SA_NODEFER
00065 # define SA_ONESHOT   SA_RESETHAND
00066 # define SA_STACK     SA_ONSTACK
00067 #endif
00068 
00069 /* Values for the HOW argument to `sigprocmask'.  */
00070 #define       SIG_BLOCK     0              /* Block signals.  */
00071 #define       SIG_UNBLOCK   1              /* Unblock signals.  */
00072 #define       SIG_SETMASK   2              /* Set the set of blocked signals.  */