1 /* The proper definitions for Linux/MIPS's sigaction. 2 Copyright (C) 1993, 1994, 1995, 1997, 1998, 1999, 2000, 2003 3 Free Software Foundation, Inc. 4 This file is part of the GNU C Library. 5 6 The GNU C Library is free software; you can redistribute it and/or 7 modify it under the terms of the GNU Lesser General Public 8 License as published by the Free Software Foundation; either 9 version 2.1 of the License, or (at your option) any later version. 10 11 The GNU C Library is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 Lesser General Public License for more details. 15 16 You should have received a copy of the GNU Lesser General Public 17 License along with the GNU C Library; if not, write to the Free 18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 19 02111-1307 USA. */ 20 21 #ifndef _SIGNAL_H 22 # error "Never include <bits/sigaction.h> directly; use <signal.h> instead." 23 #endif 24 25 /* Structure describing the action to be taken when a signal arrives. */ 26 struct sigaction 27 { 28 /* Special flags. */ 29 unsigned int sa_flags; 30 31 /* Signal handler. */ 32 #ifdef __USE_POSIX199309 33 union 34 { 35 /* Used if SA_SIGINFO is not set. */ 36 __sighandler_t sa_handler; 37 /* Used if SA_SIGINFO is set. */ 38 void (*sa_sigaction) (int, siginfo_t *, void *); 39 } 40 __sigaction_handler; 41 # define sa_handler __sigaction_handler.sa_handler 42 # define sa_sigaction __sigaction_handler.sa_sigaction 43 #else 44 __sighandler_t sa_handler; 45 #endif 46 /* Additional set of signals to be blocked. */ 47 __sigset_t sa_mask; 48 49 /* The ABI says here are two unused ints following. */ 50 /* Restore handler. */ 51 void (*sa_restorer) (void); 52 53 #if _MIPS_SZPTR < 64 54 int sa_resv[1]; 55 #endif 56 }; 57 58 /* Bits in `sa_flags'. */ 59 /* Please note that some Linux kernels versions use different values for these 60 flags which is a bug in those kernel versions. */ 61 #define SA_NOCLDSTOP 0x00000001 /* Don't send SIGCHLD when children stop. */ 62 #define SA_NOCLDWAIT 0x00010000 /* Don't create zombie on child death. */ 63 #define SA_SIGINFO 0x00000008 /* Invoke signal-catching function with 64 three arguments instead of one. */ 65 #if defined __USE_UNIX98 || defined __USE_MISC 66 # define SA_ONSTACK 0x08000000 /* Use signal stack by using `sa_restorer'. */ 67 # define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler. */ 68 # define SA_RESTART 0x10000000 /* Restart syscall on signal return. */ 69 # define SA_NODEFER 0x40000000 /* Don't automatically block the signal when 70 its handler is being executed. */ 71 #endif 72 #ifdef __USE_MISC 73 # define SA_INTERRUPT 0x20000000 /* Historical no-op. */ 74 75 /* Some aliases for the SA_ constants. */ 76 # define SA_NOMASK SA_NODEFER 77 # define SA_ONESHOT SA_RESETHAND 78 # define SA_STACK SA_ONSTACK 79 #endif 80 81 /* Values for the HOW argument to `sigprocmask'. */ 82 #define SIG_NOP 0 /* 0 is unused to catch errors */ 83 #define SIG_BLOCK 1 /* Block signals. */ 84 #define SIG_UNBLOCK 2 /* Unblock signals. */ 85 #define SIG_SETMASK 3 /* Set the set of blocked signals. */ 86 #ifdef __USE_MISC 87 # define SIG_SETMASK32 256 /* Goodie from SGI for BSD compatibility: 88 set only the low 32 bit of the sigset. */ 89 #endif 90