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glibc  2.9
sigaction.h
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00001 /* The proper definitions for Linux'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     /* Restore handler.  */
00050     void (*sa_restorer) (void);
00051   };
00052 
00053 /* Bits in `sa_flags'.  */
00054 #define       SA_NOCLDSTOP  1              /* Don't send SIGCHLD when children stop.  */
00055 #define SA_NOCLDWAIT  2             /* Don't create zombie on child death.  */
00056 #define SA_SIGINFO    4             /* Invoke signal-catching function with
00057                                 three arguments instead of one.  */
00058 #if defined __USE_UNIX98 || defined __USE_MISC
00059 # define SA_ONSTACK   0x08000000 /* Use signal stack by using `sa_restorer'. */
00060 # define SA_RESTART   0x10000000 /* Restart syscall on signal return.  */
00061 # define SA_NODEFER   0x40000000 /* Don't automatically block the signal when
00062                                 its handler is being executed.  */
00063 # define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler.  */
00064 #endif
00065 #ifdef __USE_MISC
00066 # define SA_INTERRUPT 0x20000000 /* Historical no-op.  */
00067 
00068 /* Some aliases for the SA_ constants.  */
00069 # define SA_NOMASK    SA_NODEFER
00070 # define SA_ONESHOT   SA_RESETHAND
00071 # define SA_STACK     SA_ONSTACK
00072 #endif
00073 
00074 /* Values for the HOW argument to `sigprocmask'.  */
00075 #define       SIG_BLOCK     0              /* Block signals.  */
00076 #define       SIG_UNBLOCK   1              /* Unblock signals.  */
00077 #define       SIG_SETMASK   2              /* Set the set of blocked signals.  */