| 1 | /* A GNU-like <signal.h>. |
| 2 | |
| 3 | Copyright (C) 2006-2018 Free Software Foundation, Inc. |
| 4 | |
| 5 | This program is free software: you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 3 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program 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 |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #if __GNUC__ >= 3 |
| 19 | @PRAGMA_SYSTEM_HEADER@ |
| 20 | #endif |
| 21 | @PRAGMA_COLUMNS@ |
| 22 | |
| 23 | #if defined __need_sig_atomic_t || defined __need_sigset_t || defined _GL_ALREADY_INCLUDING_SIGNAL_H || (defined _SIGNAL_H && !defined __SIZEOF_PTHREAD_MUTEX_T) |
| 24 | /* Special invocation convention: |
| 25 | - Inside glibc header files. |
| 26 | - On glibc systems we have a sequence of nested includes |
| 27 | <signal.h> -> <ucontext.h> -> <signal.h>. |
| 28 | In this situation, the functions are not yet declared, therefore we cannot |
| 29 | provide the C++ aliases. |
| 30 | - On glibc systems with GCC 4.3 we have a sequence of nested includes |
| 31 | <csignal> -> </usr/include/signal.h> -> <sys/ucontext.h> -> <signal.h>. |
| 32 | In this situation, some of the functions are not yet declared, therefore |
| 33 | we cannot provide the C++ aliases. */ |
| 34 | |
| 35 | # @INCLUDE_NEXT@ @NEXT_SIGNAL_H@ |
| 36 | |
| 37 | #else |
| 38 | /* Normal invocation convention. */ |
| 39 | |
| 40 | #ifndef _@GUARD_PREFIX@_SIGNAL_H |
| 41 | |
| 42 | #define _GL_ALREADY_INCLUDING_SIGNAL_H |
| 43 | |
| 44 | /* Define pid_t, uid_t. |
| 45 | Also, mingw defines sigset_t not in <signal.h>, but in <sys/types.h>. |
| 46 | On Solaris 10, <signal.h> includes <sys/types.h>, which eventually includes |
| 47 | us; so include <sys/types.h> now, before the second inclusion guard. */ |
| 48 | #include <sys/types.h> |
| 49 | |
| 50 | /* The include_next requires a split double-inclusion guard. */ |
| 51 | #@INCLUDE_NEXT@ @NEXT_SIGNAL_H@ |
| 52 | |
| 53 | #undef _GL_ALREADY_INCLUDING_SIGNAL_H |
| 54 | |
| 55 | #ifndef _@GUARD_PREFIX@_SIGNAL_H |
| 56 | #define _@GUARD_PREFIX@_SIGNAL_H |
| 57 | |
| 58 | /* Mac OS X 10.3, FreeBSD 6.4, OpenBSD 3.8, OSF/1 4.0, Solaris 2.6, Android |
| 59 | declare pthread_sigmask in <pthread.h>, not in <signal.h>. |
| 60 | But avoid namespace pollution on glibc systems.*/ |
| 61 | #if (@GNULIB_PTHREAD_SIGMASK@ || defined GNULIB_POSIXCHECK) \ |
| 62 | && ((defined __APPLE__ && defined __MACH__) \ |
| 63 | || defined __FreeBSD__ || defined __OpenBSD__ || defined __osf__ \ |
| 64 | || defined __sun || defined __ANDROID__) \ |
| 65 | && ! defined __GLIBC__ |
| 66 | # include <pthread.h> |
| 67 | #endif |
| 68 | |
| 69 | /* The definitions of _GL_FUNCDECL_RPL etc. are copied here. */ |
| 70 | |
| 71 | /* The definition of _GL_ARG_NONNULL is copied here. */ |
| 72 | |
| 73 | /* The definition of _GL_WARN_ON_USE is copied here. */ |
| 74 | |
| 75 | /* On AIX, sig_atomic_t already includes volatile. C99 requires that |
| 76 | 'volatile sig_atomic_t' ignore the extra modifier, but C89 did not. |
| 77 | Hence, redefine this to a non-volatile type as needed. */ |
| 78 | #if ! @HAVE_TYPE_VOLATILE_SIG_ATOMIC_T@ |
| 79 | # if !GNULIB_defined_sig_atomic_t |
| 80 | typedef int rpl_sig_atomic_t; |
| 81 | # undef sig_atomic_t |
| 82 | # define sig_atomic_t rpl_sig_atomic_t |
| 83 | # define GNULIB_defined_sig_atomic_t 1 |
| 84 | # endif |
| 85 | #endif |
| 86 | |
| 87 | /* A set or mask of signals. */ |
| 88 | #if !@HAVE_SIGSET_T@ |
| 89 | # if !GNULIB_defined_sigset_t |
| 90 | typedef unsigned int sigset_t; |
| 91 | # define GNULIB_defined_sigset_t 1 |
| 92 | # endif |
| 93 | #endif |
| 94 | |
| 95 | /* Define sighandler_t, the type of signal handlers. A GNU extension. */ |
| 96 | #if !@HAVE_SIGHANDLER_T@ |
| 97 | # ifdef __cplusplus |
| 98 | extern "C" { |
| 99 | # endif |
| 100 | # if !GNULIB_defined_sighandler_t |
| 101 | typedef void (*sighandler_t) (int); |
| 102 | # define GNULIB_defined_sighandler_t 1 |
| 103 | # endif |
| 104 | # ifdef __cplusplus |
| 105 | } |
| 106 | # endif |
| 107 | #endif |
| 108 | |
| 109 | |
| 110 | #if @GNULIB_SIGNAL_H_SIGPIPE@ |
| 111 | # ifndef SIGPIPE |
| 112 | /* Define SIGPIPE to a value that does not overlap with other signals. */ |
| 113 | # define SIGPIPE 13 |
| 114 | # define GNULIB_defined_SIGPIPE 1 |
| 115 | /* To actually use SIGPIPE, you also need the gnulib modules 'sigprocmask', |
| 116 | 'write', 'stdio'. */ |
| 117 | # endif |
| 118 | #endif |
| 119 | |
| 120 | |
| 121 | /* Maximum signal number + 1. */ |
| 122 | #ifndef NSIG |
| 123 | # if defined __TANDEM |
| 124 | # define NSIG 32 |
| 125 | # endif |
| 126 | #endif |
| 127 | |
| 128 | |
| 129 | #if @GNULIB_PTHREAD_SIGMASK@ |
| 130 | # if @REPLACE_PTHREAD_SIGMASK@ |
| 131 | # if !(defined __cplusplus && defined GNULIB_NAMESPACE) |
| 132 | # undef pthread_sigmask |
| 133 | # define pthread_sigmask rpl_pthread_sigmask |
| 134 | # endif |
| 135 | _GL_FUNCDECL_RPL (pthread_sigmask, int, |
| 136 | (int how, const sigset_t *new_mask, sigset_t *old_mask)); |
| 137 | _GL_CXXALIAS_RPL (pthread_sigmask, int, |
| 138 | (int how, const sigset_t *new_mask, sigset_t *old_mask)); |
| 139 | # else |
| 140 | # if !(@HAVE_PTHREAD_SIGMASK@ || defined pthread_sigmask) |
| 141 | _GL_FUNCDECL_SYS (pthread_sigmask, int, |
| 142 | (int how, const sigset_t *new_mask, sigset_t *old_mask)); |
| 143 | # endif |
| 144 | _GL_CXXALIAS_SYS (pthread_sigmask, int, |
| 145 | (int how, const sigset_t *new_mask, sigset_t *old_mask)); |
| 146 | # endif |
| 147 | _GL_CXXALIASWARN (pthread_sigmask); |
| 148 | #elif defined GNULIB_POSIXCHECK |
| 149 | # undef pthread_sigmask |
| 150 | # if HAVE_RAW_DECL_PTHREAD_SIGMASK |
| 151 | _GL_WARN_ON_USE (pthread_sigmask, "pthread_sigmask is not portable - " |
| 152 | "use gnulib module pthread_sigmask for portability"); |
| 153 | # endif |
| 154 | #endif |
| 155 | |
| 156 | |
| 157 | #if @GNULIB_RAISE@ |
| 158 | # if @REPLACE_RAISE@ |
| 159 | # if !(defined __cplusplus && defined GNULIB_NAMESPACE) |
| 160 | # undef raise |
| 161 | # define raise rpl_raise |
| 162 | # endif |
| 163 | _GL_FUNCDECL_RPL (raise, int, (int sig)); |
| 164 | _GL_CXXALIAS_RPL (raise, int, (int sig)); |
| 165 | # else |
| 166 | # if !@HAVE_RAISE@ |
| 167 | _GL_FUNCDECL_SYS (raise, int, (int sig)); |
| 168 | # endif |
| 169 | _GL_CXXALIAS_SYS (raise, int, (int sig)); |
| 170 | # endif |
| 171 | _GL_CXXALIASWARN (raise); |
| 172 | #elif defined GNULIB_POSIXCHECK |
| 173 | # undef raise |
| 174 | /* Assume raise is always declared. */ |
| 175 | _GL_WARN_ON_USE (raise, "raise can crash on native Windows - " |
| 176 | "use gnulib module raise for portability"); |
| 177 | #endif |
| 178 | |
| 179 | |
| 180 | #if @GNULIB_SIGPROCMASK@ |
| 181 | # if !@HAVE_POSIX_SIGNALBLOCKING@ |
| 182 | |
| 183 | # ifndef GNULIB_defined_signal_blocking |
| 184 | # define GNULIB_defined_signal_blocking 1 |
| 185 | # endif |
| 186 | |
| 187 | /* Maximum signal number + 1. */ |
| 188 | # ifndef NSIG |
| 189 | # define NSIG 32 |
| 190 | # endif |
| 191 | |
| 192 | /* This code supports only 32 signals. */ |
| 193 | # if !GNULIB_defined_verify_NSIG_constraint |
| 194 | typedef int verify_NSIG_constraint[NSIG <= 32 ? 1 : -1]; |
| 195 | # define GNULIB_defined_verify_NSIG_constraint 1 |
| 196 | # endif |
| 197 | |
| 198 | # endif |
| 199 | |
| 200 | /* When also using extern inline, suppress the use of static inline in |
| 201 | standard headers of problematic Apple configurations, as Libc at |
| 202 | least through Libc-825.26 (2013-04-09) mishandles it; see, e.g., |
| 203 | <https://lists.gnu.org/r/bug-gnulib/2012-12/msg00023.html>. |
| 204 | Perhaps Apple will fix this some day. */ |
| 205 | #if (defined _GL_EXTERN_INLINE_IN_USE && defined __APPLE__ \ |
| 206 | && (defined __i386__ || defined __x86_64__)) |
| 207 | # undef sigaddset |
| 208 | # undef sigdelset |
| 209 | # undef sigemptyset |
| 210 | # undef sigfillset |
| 211 | # undef sigismember |
| 212 | #endif |
| 213 | |
| 214 | /* Test whether a given signal is contained in a signal set. */ |
| 215 | # if @HAVE_POSIX_SIGNALBLOCKING@ |
| 216 | /* This function is defined as a macro on Mac OS X. */ |
| 217 | # if defined __cplusplus && defined GNULIB_NAMESPACE |
| 218 | # undef sigismember |
| 219 | # endif |
| 220 | # else |
| 221 | _GL_FUNCDECL_SYS (sigismember, int, (const sigset_t *set, int sig) |
| 222 | _GL_ARG_NONNULL ((1))); |
| 223 | # endif |
| 224 | _GL_CXXALIAS_SYS (sigismember, int, (const sigset_t *set, int sig)); |
| 225 | _GL_CXXALIASWARN (sigismember); |
| 226 | |
| 227 | /* Initialize a signal set to the empty set. */ |
| 228 | # if @HAVE_POSIX_SIGNALBLOCKING@ |
| 229 | /* This function is defined as a macro on Mac OS X. */ |
| 230 | # if defined __cplusplus && defined GNULIB_NAMESPACE |
| 231 | # undef sigemptyset |
| 232 | # endif |
| 233 | # else |
| 234 | _GL_FUNCDECL_SYS (sigemptyset, int, (sigset_t *set) _GL_ARG_NONNULL ((1))); |
| 235 | # endif |
| 236 | _GL_CXXALIAS_SYS (sigemptyset, int, (sigset_t *set)); |
| 237 | _GL_CXXALIASWARN (sigemptyset); |
| 238 | |
| 239 | /* Add a signal to a signal set. */ |
| 240 | # if @HAVE_POSIX_SIGNALBLOCKING@ |
| 241 | /* This function is defined as a macro on Mac OS X. */ |
| 242 | # if defined __cplusplus && defined GNULIB_NAMESPACE |
| 243 | # undef sigaddset |
| 244 | # endif |
| 245 | # else |
| 246 | _GL_FUNCDECL_SYS (sigaddset, int, (sigset_t *set, int sig) |
| 247 | _GL_ARG_NONNULL ((1))); |
| 248 | # endif |
| 249 | _GL_CXXALIAS_SYS (sigaddset, int, (sigset_t *set, int sig)); |
| 250 | _GL_CXXALIASWARN (sigaddset); |
| 251 | |
| 252 | /* Remove a signal from a signal set. */ |
| 253 | # if @HAVE_POSIX_SIGNALBLOCKING@ |
| 254 | /* This function is defined as a macro on Mac OS X. */ |
| 255 | # if defined __cplusplus && defined GNULIB_NAMESPACE |
| 256 | # undef sigdelset |
| 257 | # endif |
| 258 | # else |
| 259 | _GL_FUNCDECL_SYS (sigdelset, int, (sigset_t *set, int sig) |
| 260 | _GL_ARG_NONNULL ((1))); |
| 261 | # endif |
| 262 | _GL_CXXALIAS_SYS (sigdelset, int, (sigset_t *set, int sig)); |
| 263 | _GL_CXXALIASWARN (sigdelset); |
| 264 | |
| 265 | /* Fill a signal set with all possible signals. */ |
| 266 | # if @HAVE_POSIX_SIGNALBLOCKING@ |
| 267 | /* This function is defined as a macro on Mac OS X. */ |
| 268 | # if defined __cplusplus && defined GNULIB_NAMESPACE |
| 269 | # undef sigfillset |
| 270 | # endif |
| 271 | # else |
| 272 | _GL_FUNCDECL_SYS (sigfillset, int, (sigset_t *set) _GL_ARG_NONNULL ((1))); |
| 273 | # endif |
| 274 | _GL_CXXALIAS_SYS (sigfillset, int, (sigset_t *set)); |
| 275 | _GL_CXXALIASWARN (sigfillset); |
| 276 | |
| 277 | /* Return the set of those blocked signals that are pending. */ |
| 278 | # if !@HAVE_POSIX_SIGNALBLOCKING@ |
| 279 | _GL_FUNCDECL_SYS (sigpending, int, (sigset_t *set) _GL_ARG_NONNULL ((1))); |
| 280 | # endif |
| 281 | _GL_CXXALIAS_SYS (sigpending, int, (sigset_t *set)); |
| 282 | _GL_CXXALIASWARN (sigpending); |
| 283 | |
| 284 | /* If OLD_SET is not NULL, put the current set of blocked signals in *OLD_SET. |
| 285 | Then, if SET is not NULL, affect the current set of blocked signals by |
| 286 | combining it with *SET as indicated in OPERATION. |
| 287 | In this implementation, you are not allowed to change a signal handler |
| 288 | while the signal is blocked. */ |
| 289 | # if !@HAVE_POSIX_SIGNALBLOCKING@ |
| 290 | # define SIG_BLOCK 0 /* blocked_set = blocked_set | *set; */ |
| 291 | # define SIG_SETMASK 1 /* blocked_set = *set; */ |
| 292 | # define SIG_UNBLOCK 2 /* blocked_set = blocked_set & ~*set; */ |
| 293 | _GL_FUNCDECL_SYS (sigprocmask, int, |
| 294 | (int operation, const sigset_t *set, sigset_t *old_set)); |
| 295 | # endif |
| 296 | _GL_CXXALIAS_SYS (sigprocmask, int, |
| 297 | (int operation, const sigset_t *set, sigset_t *old_set)); |
| 298 | _GL_CXXALIASWARN (sigprocmask); |
| 299 | |
| 300 | /* Install the handler FUNC for signal SIG, and return the previous |
| 301 | handler. */ |
| 302 | # ifdef __cplusplus |
| 303 | extern "C" { |
| 304 | # endif |
| 305 | # if !GNULIB_defined_function_taking_int_returning_void_t |
| 306 | typedef void (*_gl_function_taking_int_returning_void_t) (int); |
| 307 | # define GNULIB_defined_function_taking_int_returning_void_t 1 |
| 308 | # endif |
| 309 | # ifdef __cplusplus |
| 310 | } |
| 311 | # endif |
| 312 | # if !@HAVE_POSIX_SIGNALBLOCKING@ |
| 313 | # if !(defined __cplusplus && defined GNULIB_NAMESPACE) |
| 314 | # define signal rpl_signal |
| 315 | # endif |
| 316 | _GL_FUNCDECL_RPL (signal, _gl_function_taking_int_returning_void_t, |
| 317 | (int sig, _gl_function_taking_int_returning_void_t func)); |
| 318 | _GL_CXXALIAS_RPL (signal, _gl_function_taking_int_returning_void_t, |
| 319 | (int sig, _gl_function_taking_int_returning_void_t func)); |
| 320 | # else |
| 321 | _GL_CXXALIAS_SYS (signal, _gl_function_taking_int_returning_void_t, |
| 322 | (int sig, _gl_function_taking_int_returning_void_t func)); |
| 323 | # endif |
| 324 | _GL_CXXALIASWARN (signal); |
| 325 | |
| 326 | # if !@HAVE_POSIX_SIGNALBLOCKING@ && GNULIB_defined_SIGPIPE |
| 327 | /* Raise signal SIGPIPE. */ |
| 328 | _GL_EXTERN_C int _gl_raise_SIGPIPE (void); |
| 329 | # endif |
| 330 | |
| 331 | #elif defined GNULIB_POSIXCHECK |
| 332 | # undef sigaddset |
| 333 | # if HAVE_RAW_DECL_SIGADDSET |
| 334 | _GL_WARN_ON_USE (sigaddset, "sigaddset is unportable - " |
| 335 | "use the gnulib module sigprocmask for portability"); |
| 336 | # endif |
| 337 | # undef sigdelset |
| 338 | # if HAVE_RAW_DECL_SIGDELSET |
| 339 | _GL_WARN_ON_USE (sigdelset, "sigdelset is unportable - " |
| 340 | "use the gnulib module sigprocmask for portability"); |
| 341 | # endif |
| 342 | # undef sigemptyset |
| 343 | # if HAVE_RAW_DECL_SIGEMPTYSET |
| 344 | _GL_WARN_ON_USE (sigemptyset, "sigemptyset is unportable - " |
| 345 | "use the gnulib module sigprocmask for portability"); |
| 346 | # endif |
| 347 | # undef sigfillset |
| 348 | # if HAVE_RAW_DECL_SIGFILLSET |
| 349 | _GL_WARN_ON_USE (sigfillset, "sigfillset is unportable - " |
| 350 | "use the gnulib module sigprocmask for portability"); |
| 351 | # endif |
| 352 | # undef sigismember |
| 353 | # if HAVE_RAW_DECL_SIGISMEMBER |
| 354 | _GL_WARN_ON_USE (sigismember, "sigismember is unportable - " |
| 355 | "use the gnulib module sigprocmask for portability"); |
| 356 | # endif |
| 357 | # undef sigpending |
| 358 | # if HAVE_RAW_DECL_SIGPENDING |
| 359 | _GL_WARN_ON_USE (sigpending, "sigpending is unportable - " |
| 360 | "use the gnulib module sigprocmask for portability"); |
| 361 | # endif |
| 362 | # undef sigprocmask |
| 363 | # if HAVE_RAW_DECL_SIGPROCMASK |
| 364 | _GL_WARN_ON_USE (sigprocmask, "sigprocmask is unportable - " |
| 365 | "use the gnulib module sigprocmask for portability"); |
| 366 | # endif |
| 367 | #endif /* @GNULIB_SIGPROCMASK@ */ |
| 368 | |
| 369 | |
| 370 | #if @GNULIB_SIGACTION@ |
| 371 | # if !@HAVE_SIGACTION@ |
| 372 | |
| 373 | # if !@HAVE_SIGINFO_T@ |
| 374 | |
| 375 | # if !GNULIB_defined_siginfo_types |
| 376 | |
| 377 | /* Present to allow compilation, but unsupported by gnulib. */ |
| 378 | union sigval |
| 379 | { |
| 380 | int sival_int; |
| 381 | void *sival_ptr; |
| 382 | }; |
| 383 | |
| 384 | /* Present to allow compilation, but unsupported by gnulib. */ |
| 385 | struct siginfo_t |
| 386 | { |
| 387 | int si_signo; |
| 388 | int si_code; |
| 389 | int si_errno; |
| 390 | pid_t si_pid; |
| 391 | uid_t si_uid; |
| 392 | void *si_addr; |
| 393 | int si_status; |
| 394 | long si_band; |
| 395 | union sigval si_value; |
| 396 | }; |
| 397 | typedef struct siginfo_t siginfo_t; |
| 398 | |
| 399 | # define GNULIB_defined_siginfo_types 1 |
| 400 | # endif |
| 401 | |
| 402 | # endif /* !@HAVE_SIGINFO_T@ */ |
| 403 | |
| 404 | /* We assume that platforms which lack the sigaction() function also lack |
| 405 | the 'struct sigaction' type, and vice versa. */ |
| 406 | |
| 407 | # if !GNULIB_defined_struct_sigaction |
| 408 | |
| 409 | struct sigaction |
| 410 | { |
| 411 | union |
| 412 | { |
| 413 | void (*_sa_handler) (int); |
| 414 | /* Present to allow compilation, but unsupported by gnulib. POSIX |
| 415 | says that implementations may, but not must, make sa_sigaction |
| 416 | overlap with sa_handler, but we know of no implementation where |
| 417 | they do not overlap. */ |
| 418 | void (*_sa_sigaction) (int, siginfo_t *, void *); |
| 419 | } _sa_func; |
| 420 | sigset_t sa_mask; |
| 421 | /* Not all POSIX flags are supported. */ |
| 422 | int sa_flags; |
| 423 | }; |
| 424 | # define sa_handler _sa_func._sa_handler |
| 425 | # define sa_sigaction _sa_func._sa_sigaction |
| 426 | /* Unsupported flags are not present. */ |
| 427 | # define SA_RESETHAND 1 |
| 428 | # define SA_NODEFER 2 |
| 429 | # define SA_RESTART 4 |
| 430 | |
| 431 | # define GNULIB_defined_struct_sigaction 1 |
| 432 | # endif |
| 433 | |
| 434 | _GL_FUNCDECL_SYS (sigaction, int, (int, const struct sigaction *restrict, |
| 435 | struct sigaction *restrict)); |
| 436 | |
| 437 | # elif !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@ |
| 438 | |
| 439 | # define sa_sigaction sa_handler |
| 440 | |
| 441 | # endif /* !@HAVE_SIGACTION@, !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@ */ |
| 442 | |
| 443 | _GL_CXXALIAS_SYS (sigaction, int, (int, const struct sigaction *restrict, |
| 444 | struct sigaction *restrict)); |
| 445 | _GL_CXXALIASWARN (sigaction); |
| 446 | |
| 447 | #elif defined GNULIB_POSIXCHECK |
| 448 | # undef sigaction |
| 449 | # if HAVE_RAW_DECL_SIGACTION |
| 450 | _GL_WARN_ON_USE (sigaction, "sigaction is unportable - " |
| 451 | "use the gnulib module sigaction for portability"); |
| 452 | # endif |
| 453 | #endif |
| 454 | |
| 455 | /* Some systems don't have SA_NODEFER. */ |
| 456 | #ifndef SA_NODEFER |
| 457 | # define SA_NODEFER 0 |
| 458 | #endif |
| 459 | |
| 460 | |
| 461 | #endif /* _@GUARD_PREFIX@_SIGNAL_H */ |
| 462 | #endif /* _@GUARD_PREFIX@_SIGNAL_H */ |
| 463 | #endif |