1 /* Copyright (C) 1991-2003, 2004, 2007 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, write to the Free 16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 17 02111-1307 USA. */ 18 19 /* 20 * ISO C99 Standard: 7.14 Signal handling <signal.h> 21 */ 22 23 #ifndef _SIGNAL_H 24 25 #if !defined __need_sig_atomic_t && !defined __need_sigset_t 26 # define _SIGNAL_H 27 #endif 28 29 #include <features.h> 30 31 __BEGIN_DECLS 32 33 #include <bits/sigset.h> /* __sigset_t, __sig_atomic_t. */ 34 35 /* An integral type that can be modified atomically, without the 36 possibility of a signal arriving in the middle of the operation. */ 37 #if defined __need_sig_atomic_t || defined _SIGNAL_H 38 # ifndef __sig_atomic_t_defined 39 # define __sig_atomic_t_defined 40 __BEGIN_NAMESPACE_STD 41 typedef __sig_atomic_t sig_atomic_t; 42 __END_NAMESPACE_STD 43 # endif 44 # undef __need_sig_atomic_t 45 #endif 46 47 #if defined __need_sigset_t || (defined _SIGNAL_H && defined __USE_POSIX) 48 # ifndef __sigset_t_defined 49 # define __sigset_t_defined 50 typedef __sigset_t sigset_t; 51 # endif 52 # undef __need_sigset_t 53 #endif 54 55 #ifdef _SIGNAL_H 56 57 #include <bits/types.h> 58 #include <bits/signum.h> 59 60 #if defined __USE_XOPEN || defined __USE_XOPEN2K 61 # ifndef __pid_t_defined 62 typedef __pid_t pid_t; 63 # define __pid_t_defined 64 #endif 65 #ifdef __USE_XOPEN 66 # endif 67 # ifndef __uid_t_defined 68 typedef __uid_t uid_t; 69 # define __uid_t_defined 70 # endif 71 #endif /* Unix98 */ 72 73 74 /* Type of a signal handler. */ 75 typedef void (*__sighandler_t) (int); 76 77 /* The X/Open definition of `signal' specifies the SVID semantic. Use 78 the additional function `sysv_signal' when X/Open compatibility is 79 requested. */ 80 extern __sighandler_t __sysv_signal (int __sig, __sighandler_t __handler) 81 __THROW; 82 #ifdef __USE_GNU 83 extern __sighandler_t sysv_signal (int __sig, __sighandler_t __handler) 84 __THROW; 85 #endif 86 87 /* Set the handler for the signal SIG to HANDLER, returning the old 88 handler, or SIG_ERR on error. 89 By default `signal' has the BSD semantic. */ 90 __BEGIN_NAMESPACE_STD 91 #ifdef __USE_BSD 92 extern __sighandler_t signal (int __sig, __sighandler_t __handler) 93 __THROW; 94 #else 95 /* Make sure the used `signal' implementation is the SVID version. */ 96 # ifdef __REDIRECT_NTH 97 extern __sighandler_t __REDIRECT_NTH (signal, 98 (int __sig, __sighandler_t __handler), 99 __sysv_signal); 100 # else 101 # define signal __sysv_signal 102 # endif 103 #endif 104 __END_NAMESPACE_STD 105 106 #ifdef __USE_XOPEN 107 /* The X/Open definition of `signal' conflicts with the BSD version. 108 So they defined another function `bsd_signal'. */ 109 extern __sighandler_t bsd_signal (int __sig, __sighandler_t __handler) 110 __THROW; 111 #endif 112 113 /* Send signal SIG to process number PID. If PID is zero, 114 send SIG to all processes in the current process's process group. 115 If PID is < -1, send SIG to all processes in process group - PID. */ 116 #ifdef __USE_POSIX 117 extern int kill (__pid_t __pid, int __sig) __THROW; 118 #endif /* Use POSIX. */ 119 120 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED 121 /* Send SIG to all processes in process group PGRP. 122 If PGRP is zero, send SIG to all processes in 123 the current process's process group. */ 124 extern int killpg (__pid_t __pgrp, int __sig) __THROW; 125 #endif /* Use BSD || X/Open Unix. */ 126 127 __BEGIN_NAMESPACE_STD 128 /* Raise signal SIG, i.e., send SIG to yourself. */ 129 extern int raise (int __sig) __THROW; 130 __END_NAMESPACE_STD 131 132 #ifdef __USE_SVID 133 /* SVID names for the same things. */ 134 extern __sighandler_t ssignal (int __sig, __sighandler_t __handler) 135 __THROW; 136 extern int gsignal (int __sig) __THROW; 137 #endif /* Use SVID. */ 138 139 #ifdef __USE_MISC 140 /* Print a message describing the meaning of the given signal number. */ 141 extern void psignal (int __sig, __const char *__s); 142 #endif /* Use misc. */ 143 144 145 /* The `sigpause' function has two different interfaces. The original 146 BSD definition defines the argument as a mask of the signal, while 147 the more modern interface in X/Open defines it as the signal 148 number. We go with the BSD version unless the user explicitly 149 selects the X/Open version. 150 151 This function is a cancellation point and therefore not marked with 152 __THROW. */ 153 extern int __sigpause (int __sig_or_mask, int __is_sig); 154 155 #ifdef __FAVOR_BSD 156 /* Set the mask of blocked signals to MASK, 157 wait for a signal to arrive, and then restore the mask. */ 158 extern int sigpause (int __mask) __THROW __attribute_deprecated__; 159 #else 160 # ifdef __USE_XOPEN 161 # ifdef __GNUC__ 162 extern int sigpause (int __sig) __asm__ ("__xpg_sigpause"); 163 # else 164 /* Remove a signal from the signal mask and suspend the process. */ 165 # define sigpause(sig) __sigpause ((sig), 1) 166 # endif 167 # endif 168 #endif 169 170 171 #ifdef __USE_BSD 172 /* None of the following functions should be used anymore. They are here 173 only for compatibility. A single word (`int') is not guaranteed to be 174 enough to hold a complete signal mask and therefore these functions 175 simply do not work in many situations. Use `sigprocmask' instead. */ 176 177 /* Compute mask for signal SIG. */ 178 # define sigmask(sig) __sigmask(sig) 179 180 /* Block signals in MASK, returning the old mask. */ 181 extern int sigblock (int __mask) __THROW __attribute_deprecated__; 182 183 /* Set the mask of blocked signals to MASK, returning the old mask. */ 184 extern int sigsetmask (int __mask) __THROW __attribute_deprecated__; 185 186 /* Return currently selected signal mask. */ 187 extern int siggetmask (void) __THROW __attribute_deprecated__; 188 #endif /* Use BSD. */ 189 190 191 #ifdef __USE_MISC 192 # define NSIG _NSIG 193 #endif 194 195 #ifdef __USE_GNU 196 typedef __sighandler_t sighandler_t; 197 #endif 198 199 /* 4.4 BSD uses the name `sig_t' for this. */ 200 #ifdef __USE_BSD 201 typedef __sighandler_t sig_t; 202 #endif 203 204 #ifdef __USE_POSIX 205 206 # ifdef __USE_POSIX199309 207 /* We need `struct timespec' later on. */ 208 # define __need_timespec 209 # include <time.h> 210 211 /* Get the `siginfo_t' type plus the needed symbols. */ 212 # include <bits/siginfo.h> 213 # endif 214 215 /* Clear all signals from SET. */ 216 extern int sigemptyset (sigset_t *__set) __THROW __nonnull ((1)); 217 218 /* Set all signals in SET. */ 219 extern int sigfillset (sigset_t *__set) __THROW __nonnull ((1)); 220 221 /* Add SIGNO to SET. */ 222 extern int sigaddset (sigset_t *__set, int __signo) __THROW __nonnull ((1)); 223 224 /* Remove SIGNO from SET. */ 225 extern int sigdelset (sigset_t *__set, int __signo) __THROW __nonnull ((1)); 226 227 /* Return 1 if SIGNO is in SET, 0 if not. */ 228 extern int sigismember (__const sigset_t *__set, int __signo) 229 __THROW __nonnull ((1)); 230 231 # ifdef __USE_GNU 232 /* Return non-empty value is SET is not empty. */ 233 extern int sigisemptyset (__const sigset_t *__set) __THROW __nonnull ((1)); 234 235 /* Build new signal set by combining the two inputs set using logical AND. */ 236 extern int sigandset (sigset_t *__set, __const sigset_t *__left, 237 __const sigset_t *__right) __THROW __nonnull ((1, 2, 3)); 238 239 /* Build new signal set by combining the two inputs set using logical OR. */ 240 extern int sigorset (sigset_t *__set, __const sigset_t *__left, 241 __const sigset_t *__right) __THROW __nonnull ((1, 2, 3)); 242 # endif /* GNU */ 243 244 /* Get the system-specific definitions of `struct sigaction' 245 and the `SA_*' and `SIG_*'. constants. */ 246 # include <bits/sigaction.h> 247 248 /* Get and/or change the set of blocked signals. */ 249 extern int sigprocmask (int __how, __const sigset_t *__restrict __set, 250 sigset_t *__restrict __oset) __THROW; 251 252 /* Change the set of blocked signals to SET, 253 wait until a signal arrives, and restore the set of blocked signals. 254 255 This function is a cancellation point and therefore not marked with 256 __THROW. */ 257 extern int sigsuspend (__const sigset_t *__set) __nonnull ((1)); 258 259 /* Get and/or set the action for signal SIG. */ 260 extern int sigaction (int __sig, __const struct sigaction *__restrict __act, 261 struct sigaction *__restrict __oact) __THROW; 262 263 /* Put in SET all signals that are blocked and waiting to be delivered. */ 264 extern int sigpending (sigset_t *__set) __THROW __nonnull ((1)); 265 266 267 /* Select any of pending signals from SET or wait for any to arrive. 268 269 This function is a cancellation point and therefore not marked with 270 __THROW. */ 271 extern int sigwait (__const sigset_t *__restrict __set, int *__restrict __sig) 272 __nonnull ((1, 2)); 273 274 # ifdef __USE_POSIX199309 275 /* Select any of pending signals from SET and place information in INFO. 276 277 This function is a cancellation point and therefore not marked with 278 __THROW. */ 279 extern int sigwaitinfo (__const sigset_t *__restrict __set, 280 siginfo_t *__restrict __info) __nonnull ((1)); 281 282 /* Select any of pending signals from SET and place information in INFO. 283 Wait the time specified by TIMEOUT if no signal is pending. 284 285 This function is a cancellation point and therefore not marked with 286 __THROW. */ 287 extern int sigtimedwait (__const sigset_t *__restrict __set, 288 siginfo_t *__restrict __info, 289 __const struct timespec *__restrict __timeout) 290 __nonnull ((1)); 291 292 /* Send signal SIG to the process PID. Associate data in VAL with the 293 signal. */ 294 extern int sigqueue (__pid_t __pid, int __sig, __const union sigval __val) 295 __THROW; 296 # endif /* Use POSIX 199306. */ 297 298 #endif /* Use POSIX. */ 299 300 #ifdef __USE_BSD 301 302 /* Names of the signals. This variable exists only for compatibility. 303 Use `strsignal' instead (see <string.h>). */ 304 extern __const char *__const _sys_siglist[_NSIG]; 305 extern __const char *__const sys_siglist[_NSIG]; 306 307 /* Structure passed to `sigvec'. */ 308 struct sigvec 309 { 310 __sighandler_t sv_handler; /* Signal handler. */ 311 int sv_mask; /* Mask of signals to be blocked. */ 312 313 int sv_flags; /* Flags (see below). */ 314 # define sv_onstack sv_flags /* 4.2 BSD compatibility. */ 315 }; 316 317 /* Bits in `sv_flags'. */ 318 # define SV_ONSTACK (1 << 0)/* Take the signal on the signal stack. */ 319 # define SV_INTERRUPT (1 << 1)/* Do not restart system calls. */ 320 # define SV_RESETHAND (1 << 2)/* Reset handler to SIG_DFL on receipt. */ 321 322 323 /* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member 324 of VEC. The signals in `sv_mask' will be blocked while the handler runs. 325 If the SV_RESETHAND bit is set in `sv_flags', the handler for SIG will be 326 reset to SIG_DFL before `sv_handler' is entered. If OVEC is non-NULL, 327 it is filled in with the old information for SIG. */ 328 extern int sigvec (int __sig, __const struct sigvec *__vec, 329 struct sigvec *__ovec) __THROW; 330 331 332 /* Get machine-dependent `struct sigcontext' and signal subcodes. */ 333 # include <bits/sigcontext.h> 334 335 /* Restore the state saved in SCP. */ 336 extern int sigreturn (struct sigcontext *__scp) __THROW; 337 338 #endif /* use BSD. */ 339 340 341 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED 342 # define __need_size_t 343 # include <stddef.h> 344 345 /* If INTERRUPT is nonzero, make signal SIG interrupt system calls 346 (causing them to fail with EINTR); if INTERRUPT is zero, make system 347 calls be restarted after signal SIG. */ 348 extern int siginterrupt (int __sig, int __interrupt) __THROW; 349 350 # include <bits/sigstack.h> 351 # ifdef __USE_XOPEN 352 /* This will define `ucontext_t' and `mcontext_t'. */ 353 # include <sys/ucontext.h> 354 # endif 355 356 /* Run signals handlers on the stack specified by SS (if not NULL). 357 If OSS is not NULL, it is filled in with the old signal stack status. 358 This interface is obsolete and on many platform not implemented. */ 359 extern int sigstack (struct sigstack *__ss, struct sigstack *__oss) 360 __THROW __attribute_deprecated__; 361 362 /* Alternate signal handler stack interface. 363 This interface should always be preferred over `sigstack'. */ 364 extern int sigaltstack (__const struct sigaltstack *__restrict __ss, 365 struct sigaltstack *__restrict __oss) __THROW; 366 367 #endif /* use BSD or X/Open Unix. */ 368 369 #ifdef __USE_XOPEN_EXTENDED 370 /* Simplified interface for signal management. */ 371 372 /* Add SIG to the calling process' signal mask. */ 373 extern int sighold (int __sig) __THROW; 374 375 /* Remove SIG from the calling process' signal mask. */ 376 extern int sigrelse (int __sig) __THROW; 377 378 /* Set the disposition of SIG to SIG_IGN. */ 379 extern int sigignore (int __sig) __THROW; 380 381 /* Set the disposition of SIG. */ 382 extern __sighandler_t sigset (int __sig, __sighandler_t __disp) __THROW; 383 #endif 384 385 #if defined __USE_POSIX199506 || defined __USE_UNIX98 386 /* Some of the functions for handling signals in threaded programs must 387 be defined here. */ 388 # include <bits/pthreadtypes.h> 389 # include <bits/sigthread.h> 390 #endif /* use Unix98 */ 391 392 /* The following functions are used internally in the C library and in 393 other code which need deep insights. */ 394 395 /* Return number of available real-time signal with highest priority. */ 396 extern int __libc_current_sigrtmin (void) __THROW; 397 /* Return number of available real-time signal with lowest priority. */ 398 extern int __libc_current_sigrtmax (void) __THROW; 399 400 #endif /* signal.h */ 401 402 __END_DECLS 403 404 #endif /* not signal.h */ 405
