1 /* 2 * Copyright (c) 1982, 1986, 1989, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)signal.h 8.4 (Berkeley) 5/4/95 35 * $FreeBSD: src/sys/sys/signal.h,v 1.23.2.2 2001/04/19 01:38:35 alfred Exp $ 36 */ 37 38 #ifndef _SYS_SIGNAL_H_ 39 #define _SYS_SIGNAL_H_ 40 41 #include <sys/cdefs.h> 42 #include <sys/_pthreadtypes.h> 43 #include <sys/_siginfo.h> 44 #include <sys/_sigset.h> 45 #include <machine/stdint.h> 46 47 #ifndef _PID_T_DECLARED 48 typedef __pid_t pid_t; 49 #define _PID_T_DECLARED 50 #endif 51 52 #ifndef _SIZE_T_DECLARED 53 typedef __size_t size_t; 54 #define _SIZE_T_DECLARED 55 #endif 56 57 #ifndef _UID_T_DECLARED 58 typedef __uint32_t uid_t; 59 #define _UID_T_DECLARED 60 #endif 61 62 /* 63 * sigset_t macros. 64 */ 65 #define _SIG_MAXSIG 128 66 #define _SIG_IDX(sig) ((sig) - 1) 67 #define _SIG_WORD(sig) (_SIG_IDX(sig) >> 5) 68 #define _SIG_BIT(sig) (1 << (_SIG_IDX(sig) & 31)) 69 #define _SIG_VALID(sig) ((sig) < _SIG_MAXSIG && (sig) > 0) 70 71 /* 72 * System defined signals. 73 */ 74 #if __POSIX_VISIBLE 75 #define SIGHUP 1 /* hangup */ 76 #endif 77 #define SIGINT 2 /* interrupt */ 78 #if __POSIX_VISIBLE 79 #define SIGQUIT 3 /* quit */ 80 #endif 81 #define SIGILL 4 /* illegal instr. (not reset when caught) */ 82 #if __XSI_VISIBLE 83 #define SIGTRAP 5 /* trace trap (not reset when caught) */ 84 #endif 85 #define SIGABRT 6 /* abort() */ 86 #if __BSD_VISIBLE 87 #define SIGIOT SIGABRT /* compatibility */ 88 #define SIGEMT 7 /* EMT instruction */ 89 #endif 90 #define SIGFPE 8 /* floating point exception */ 91 #if __POSIX_VISIBLE 92 #define SIGKILL 9 /* kill (cannot be caught or ignored) */ 93 #endif 94 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE 95 #define SIGBUS 10 /* bus error */ 96 #endif 97 #define SIGSEGV 11 /* segmentation violation */ 98 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE 99 #define SIGSYS 12 /* non-existent system call invoked */ 100 #endif 101 #if __POSIX_VISIBLE 102 #define SIGPIPE 13 /* write on a pipe with no one to read it */ 103 #define SIGALRM 14 /* alarm clock */ 104 #endif 105 #define SIGTERM 15 /* software termination signal from kill */ 106 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE 107 #define SIGURG 16 /* urgent condition on IO channel */ 108 #endif 109 #if __POSIX_VISIBLE 110 #define SIGSTOP 17 /* sendable stop signal not from tty */ 111 #define SIGTSTP 18 /* stop signal from tty */ 112 #define SIGCONT 19 /* continue a stopped process */ 113 #define SIGCHLD 20 /* to parent on child stop or exit */ 114 #define SIGTTIN 21 /* to readers pgrp upon background tty read */ 115 #define SIGTTOU 22 /* like TTIN if (tp->t_local<OSTOP) */ 116 #endif 117 #if __BSD_VISIBLE 118 #define SIGIO 23 /* input/output possible signal */ 119 #endif 120 #if __XSI_VISIBLE 121 #define SIGXCPU 24 /* exceeded CPU time limit */ 122 #define SIGXFSZ 25 /* exceeded file size limit */ 123 #define SIGVTALRM 26 /* virtual time alarm */ 124 #define SIGPROF 27 /* profiling time alarm */ 125 #endif 126 #if __BSD_VISIBLE 127 #define SIGWINCH 28 /* window size changes */ 128 #define SIGINFO 29 /* information request */ 129 #endif 130 #if __POSIX_VISIBLE 131 #define SIGUSR1 30 /* user defined signal 1 */ 132 #define SIGUSR2 31 /* user defined signal 2 */ 133 #endif 134 #if __BSD_VISIBLE 135 #define SIGTHR 32 /* Thread interrupt (FreeBSD-5 reserved) */ 136 #define SIGCKPT 33 /* checkpoint and continue */ 137 #define SIGCKPTEXIT 34 /* checkpoint and exit */ 138 #endif 139 140 /*- 141 * Type of a signal handling function. 142 * 143 * Language spec sez signal handlers take exactly one arg, even though we 144 * actually supply three. Ugh! 145 * 146 * We don't try to hide the difference by leaving out the args because 147 * that would cause warnings about conformant programs. Nonconformant 148 * programs can avoid the warnings by casting to (__sighandler_t *) or 149 * sig_t before calling signal() or assigning to sa_handler or sv_handler. 150 * 151 * The kernel should reverse the cast before calling the function. It 152 * has no way to do this, but on most machines 1-arg and 3-arg functions 153 * have the same calling protocol so there is no problem in practice. 154 * A bit in sa_flags could be used to specify the number of args. 155 * 156 * SIG_EINTR causes system calls to interrupt but generates no signal 157 * delivery. The caller is responsible for polling the event. 158 */ 159 typedef void __sighandler_t (int); 160 161 #define SIG_DFL ((__sighandler_t *)0) 162 #define SIG_IGN ((__sighandler_t *)1) 163 #define SIG_ERR ((__sighandler_t *)-1) 164 165 #if __POSIX_VISIBLE >= 199309 166 struct sigevent { 167 int sigev_notify; /* Notification type */ 168 union { 169 int __sigev_signo; /* Signal number */ 170 int __sigev_notify_kqueue; 171 pthread_attr_t *__sigev_notify_attributes; 172 } __sigev_u; 173 union sigval sigev_value; /* Signal value */ 174 void (*sigev_notify_function)(union sigval); 175 }; 176 #define sigev_signo __sigev_u.__sigev_signo 177 #define sigev_notify_attributes __sigev_u.__sigev_notify_attributes 178 #if __BSD_VISIBLE 179 #define sigev_notify_kqueue __sigev_u.__sigev_notify_kqueue 180 #endif 181 182 #define SIGEV_NONE 0 /* No async notification */ 183 #define SIGEV_SIGNAL 1 /* Generate a queued signal */ 184 #define SIGEV_THREAD 2 /* Call back in a pthread */ 185 #if __BSD_VISIBLE 186 #define SIGEV_KEVENT 3 /* Generate a kevent */ 187 #endif 188 #endif /* __POSIX_VISIBLE >= 199309 */ 189 190 #ifndef _SIGSET_T_DECLARED 191 typedef struct __sigset sigset_t; 192 #define _SIGSET_T_DECLARED 193 #endif 194 195 /* 196 * XXX - there are some nasty dependencies on include file order. Now that 197 * sigset_t has been defined we can include the MD header. 198 */ 199 #include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */ 200 201 #if __POSIX_VISIBLE 202 struct __siginfo; 203 204 /* 205 * Signal vector "template" used in sigaction call. 206 */ 207 struct sigaction { 208 union { 209 void (*__sa_handler) (int); 210 void (*__sa_sigaction) (int, struct __siginfo *, void *); 211 } __sigaction_u; /* signal handler */ 212 int sa_flags; /* see signal options below */ 213 sigset_t sa_mask; /* signal mask to apply */ 214 }; 215 216 /* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */ 217 #define sa_handler __sigaction_u.__sa_handler 218 219 #define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */ 220 #endif /* __POSIX_VISIBLE */ 221 222 #if __XSI_VISIBLE 223 #define sa_sigaction __sigaction_u.__sa_sigaction 224 #endif 225 226 #if __XSI_VISIBLE 227 #define SA_ONSTACK 0x0001 /* take signal on signal stack */ 228 #define SA_RESTART 0x0002 /* restart system call on signal return */ 229 #define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */ 230 #define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */ 231 #define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */ 232 #define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */ 233 #endif 234 235 #if __BSD_VISIBLE 236 #define NSIG 64 /* size of sigptbl */ 237 238 /* Additional FreeBSD values. */ 239 #define SI_UNDEFINED 0 240 241 typedef void __siginfohandler_t (int, siginfo_t *, void *); 242 243 #endif 244 245 /* XXX this should really be under __BSD_VISIBLE */ 246 typedef __sighandler_t *sig_t; /* type of pointer to a signal function */ 247 248 /* #if __XSI_VISIBLE */ 249 /* 250 * Structure used in sigaltstack call. 251 */ 252 #if __BSD_VISIBLE 253 typedef struct sigaltstack { 254 #else 255 typedef struct { 256 #endif 257 void *ss_sp; /* signal stack base */ 258 size_t ss_size; /* signal stack length */ 259 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */ 260 } stack_t; 261 262 #define SS_ONSTACK 0x0001 /* take signal on alternate stack */ 263 #define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */ 264 #define MINSIGSTKSZ 8192 /* minimum allowable stack */ 265 #define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */ 266 /* #endif */ 267 268 /* Have enough typedefs for this now. XXX */ 269 #include <sys/ucontext.h> 270 271 #if __BSD_VISIBLE 272 /* 273 * 4.3 compatibility: 274 * Signal vector "template" used in sigvec call. 275 */ 276 struct sigvec { 277 __sighandler_t *sv_handler; /* signal handler */ 278 int sv_mask; /* signal mask to apply */ 279 int sv_flags; /* see signal options below */ 280 }; 281 282 #define SV_ONSTACK SA_ONSTACK 283 #define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */ 284 #define SV_RESETHAND SA_RESETHAND 285 #define SV_NODEFER SA_NODEFER 286 #define SV_NOCLDSTOP SA_NOCLDSTOP 287 #define SV_SIGINFO SA_SIGINFO 288 #define sv_onstack sv_flags /* isn't compatibility wonderful! */ 289 #endif 290 291 #if __BSD_VISIBLE || (__POSIX_VISIBLE && __POSIX_VISIBLE < 200809) 292 /* 293 * Macro for converting signal number to a mask suitable for 294 * sigblock(). 295 */ 296 #define sigmask(m) (1 << ((m)-1)) 297 #endif 298 299 #if __BSD_VISIBLE 300 #define BADSIG SIG_ERR 301 #endif 302 303 #if __POSIX_VISIBLE 304 /* 305 * Flags for sigprocmask: 306 */ 307 #define SIG_BLOCK 1 /* block specified signal set */ 308 #define SIG_UNBLOCK 2 /* unblock specified signal set */ 309 #define SIG_SETMASK 3 /* set specified signal set */ 310 #endif 311 312 /* 313 * For historical reasons; programs expect signal's return value to be 314 * defined by <sys/signal.h>. 315 */ 316 __BEGIN_DECLS 317 __sighandler_t *signal(int, __sighandler_t *); 318 #if __BSD_VISIBLE 319 int sigblockall(void); 320 int sigunblockall(void); 321 #endif 322 __END_DECLS 323 324 #endif /* !_SYS_SIGNAL_H_ */ 325