1 /* The proper definitions for Linux/MIPS's sigaction. 2 Copyright (C) 1993-2021 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 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef _BITS_SIGACTION_H 20 #define _BITS_SIGACTION_H 1 21 22 #ifndef _SIGNAL_H 23 # error "Never include <bits/sigaction.h> directly; use <signal.h> instead." 24 #endif 25 26 /* Structure describing the action to be taken when a signal arrives. */ 27 struct sigaction 28 { 29 /* Special flags. */ 30 int sa_flags; 31 32 /* Signal handler. */ 33 #if defined __USE_POSIX199309 || defined __USE_XOPEN_EXTENDED 34 union 35 { 36 /* Used if SA_SIGINFO is not set. */ 37 __sighandler_t sa_handler; 38 /* Used if SA_SIGINFO is set. */ 39 void (*sa_sigaction) (int, siginfo_t *, void *); 40 } 41 __sigaction_handler; 42 # define sa_handler __sigaction_handler.sa_handler 43 # define sa_sigaction __sigaction_handler.sa_sigaction 44 #else 45 __sighandler_t sa_handler; 46 #endif 47 /* Additional set of signals to be blocked. */ 48 __sigset_t sa_mask; 49 50 /* The ABI says here are two unused ints following. */ 51 /* Restore handler. */ 52 void (*sa_restorer) (void); 53 54 #if _MIPS_SZPTR < 64 55 int sa_resv[1]; 56 #endif 57 }; 58 59 /* Bits in `sa_flags'. */ 60 /* Please note that some Linux kernels versions use different values for these 61 flags which is a bug in those kernel versions. */ 62 #define SA_NOCLDSTOP 0x00000001 /* Don't send SIGCHLD when children stop. */ 63 #define SA_NOCLDWAIT 0x00010000 /* Don't create zombie on child death. */ 64 #define SA_SIGINFO 0x00000008 /* Invoke signal-catching function with 65 three arguments instead of one. */ 66 #if defined __USE_XOPEN_EXTENDED || defined __USE_MISC 67 # define SA_ONSTACK 0x08000000 /* Use signal stack by using `sa_restorer'. */ 68 #endif 69 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 70 # define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler. */ 71 # define SA_RESTART 0x10000000 /* Restart syscall on signal return. */ 72 # define SA_NODEFER 0x40000000 /* Don't automatically block the signal when 73 its handler is being executed. */ 74 #endif 75 #ifdef __USE_MISC 76 # define SA_INTERRUPT 0x20000000 /* Historical no-op. */ 77 78 /* Some aliases for the SA_ constants. */ 79 # define SA_NOMASK SA_NODEFER 80 # define SA_ONESHOT SA_RESETHAND 81 # define SA_STACK SA_ONSTACK 82 #endif 83 84 /* Values for the HOW argument to `sigprocmask'. */ 85 #define SIG_NOP 0 /* 0 is unused to catch errors */ 86 #define SIG_BLOCK 1 /* Block signals. */ 87 #define SIG_UNBLOCK 2 /* Unblock signals. */ 88 #define SIG_SETMASK 3 /* Set the set of blocked signals. */ 89 #ifdef __USE_MISC 90 # define SIG_SETMASK32 256 /* Goodie from SGI for BSD compatibility: 91 set only the low 32 bit of the sigset. */ 92 #endif 93 94 #endif