1 /* The proper definitions for Linux's sigaction. 2 Copyright (C) 1993-1999, 2000, 2010 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 struct sigaction 25 { 26 /* Signal handler. */ 27 #ifdef __USE_POSIX199309 28 union 29 { 30 /* Used if SA_SIGINFO is not set. */ 31 __sighandler_t sa_handler; 32 /* Used if SA_SIGINFO is set. */ 33 void (*sa_sigaction) (int, siginfo_t *, void *); 34 } 35 __sigaction_handler; 36 # define sa_handler __sigaction_handler.sa_handler 37 # define sa_sigaction __sigaction_handler.sa_sigaction 38 #else 39 __sighandler_t sa_handler; 40 #endif 41 42 /* Additional set of signals to be blocked. */ 43 __sigset_t sa_mask; 44 45 /* Special flags. */ 46 int sa_flags; 47 48 /* Restore handler. */ 49 void (*sa_restorer) (void); 50 }; 51 52 /* Bits in `sa_flags'. */ 53 #define SA_NOCLDSTOP 1 /* Don't send SIGCHLD when children stop. */ 54 #define SA_NOCLDWAIT 2 /* Don't create zombie on child death. */ 55 #define SA_SIGINFO 4 /* Invoke signal-catching function with 56 three arguments instead of one. */ 57 #if defined __USE_UNIX98 || defined __USE_MISC 58 # define SA_ONSTACK 0x08000000 /* Use signal stack by using `sa_restorer'. */ 59 #endif 60 #if defined __USE_UNIX98 || defined __USE_MISC || defined __USE_XOPEN2K8 61 # define SA_RESTART 0x10000000 /* Restart syscall on signal return. */ 62 # define SA_NODEFER 0x40000000 /* Don't automatically block the signal when 63 its handler is being executed. */ 64 # define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler. */ 65 #endif 66 #ifdef __USE_MISC 67 # define SA_INTERRUPT 0x20000000 /* Historical no-op. */ 68 69 /* Some aliases for the SA_ constants. */ 70 # define SA_NOMASK SA_NODEFER 71 # define SA_ONESHOT SA_RESETHAND 72 # define SA_STACK SA_ONSTACK 73 #endif 74 75 /* Values for the HOW argument to `sigprocmask'. */ 76 #define SIG_BLOCK 0 /* Block signals. */ 77 #define SIG_UNBLOCK 1 /* Unblock signals. */ 78 #define SIG_SETMASK 2 /* Set the set of blocked signals. */ 79