1/* A GNU-like <signal.h>. 2 3 Copyright (C) 2006-2014 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 <http://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 declare 59 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__) || defined __FreeBSD__ || defined __OpenBSD__ || defined __osf__ || defined __sun) \ 63 && ! defined __GLIBC__ 64# include <pthread.h> 65#endif 66 67/* The definitions of _GL_FUNCDECL_RPL etc. are copied here. */ 68 69/* The definition of _GL_ARG_NONNULL is copied here. */ 70 71/* The definition of _GL_WARN_ON_USE is copied here. */ 72 73/* On AIX, sig_atomic_t already includes volatile. C99 requires that 74 'volatile sig_atomic_t' ignore the extra modifier, but C89 did not. 75 Hence, redefine this to a non-volatile type as needed. */ 76#if ! @HAVE_TYPE_VOLATILE_SIG_ATOMIC_T@ 77# if !GNULIB_defined_sig_atomic_t 78typedef int rpl_sig_atomic_t; 79# undef sig_atomic_t 80# define sig_atomic_t rpl_sig_atomic_t 81# define GNULIB_defined_sig_atomic_t 1 82# endif 83#endif 84 85/* A set or mask of signals. */ 86#if !@HAVE_SIGSET_T@ 87# if !GNULIB_defined_sigset_t 88typedef unsigned int sigset_t; 89# define GNULIB_defined_sigset_t 1 90# endif 91#endif 92 93/* Define sighandler_t, the type of signal handlers. A GNU extension. */ 94#if !@HAVE_SIGHANDLER_T@ 95# ifdef __cplusplus 96extern "C" { 97# endif 98# if !GNULIB_defined_sighandler_t 99typedef void (*sighandler_t) (int); 100# define GNULIB_defined_sighandler_t 1 101# endif 102# ifdef __cplusplus 103} 104# endif 105#endif 106 107 108#if @GNULIB_SIGNAL_H_SIGPIPE@ 109# ifndef SIGPIPE 110/* Define SIGPIPE to a value that does not overlap with other signals. */ 111# define SIGPIPE 13 112# define GNULIB_defined_SIGPIPE 1 113/* To actually use SIGPIPE, you also need the gnulib modules 'sigprocmask', 114 'write', 'stdio'. */ 115# endif 116#endif 117 118 119/* Maximum signal number + 1. */ 120#ifndef NSIG 121# if defined __TANDEM 122# define NSIG 32 123# endif 124#endif 125 126 127#if @GNULIB_PTHREAD_SIGMASK@ 128# if @REPLACE_PTHREAD_SIGMASK@ 129# if !(defined __cplusplus && defined GNULIB_NAMESPACE) 130# undef pthread_sigmask 131# define pthread_sigmask rpl_pthread_sigmask 132# endif 133_GL_FUNCDECL_RPL (pthread_sigmask, int, 134 (int how, const sigset_t *new_mask, sigset_t *old_mask)); 135_GL_CXXALIAS_RPL (pthread_sigmask, int, 136 (int how, const sigset_t *new_mask, sigset_t *old_mask)); 137# else 138# if !@HAVE_PTHREAD_SIGMASK@ 139_GL_FUNCDECL_SYS (pthread_sigmask, int, 140 (int how, const sigset_t *new_mask, sigset_t *old_mask)); 141# endif 142_GL_CXXALIAS_SYS (pthread_sigmask, int, 143 (int how, const sigset_t *new_mask, sigset_t *old_mask)); 144# endif 145_GL_CXXALIASWARN (pthread_sigmask); 146#elif defined GNULIB_POSIXCHECK 147# undef pthread_sigmask 148# if HAVE_RAW_DECL_PTHREAD_SIGMASK 149_GL_WARN_ON_USE (pthread_sigmask, "pthread_sigmask is not portable - " 150 "use gnulib module pthread_sigmask for portability"); 151# endif 152#endif 153 154 155#if @GNULIB_RAISE@ 156# if @REPLACE_RAISE@ 157# if !(defined __cplusplus && defined GNULIB_NAMESPACE) 158# undef raise 159# define raise rpl_raise 160# endif 161_GL_FUNCDECL_RPL (raise, int, (int sig)); 162_GL_CXXALIAS_RPL (raise, int, (int sig)); 163# else 164# if !@HAVE_RAISE@ 165_GL_FUNCDECL_SYS (raise, int, (int sig)); 166# endif 167_GL_CXXALIAS_SYS (raise, int, (int sig)); 168# endif 169_GL_CXXALIASWARN (raise); 170#elif defined GNULIB_POSIXCHECK 171# undef raise 172/* Assume raise is always declared. */ 173_GL_WARN_ON_USE (raise, "raise can crash on native Windows - " 174 "use gnulib module raise for portability"); 175#endif 176 177 178#if @GNULIB_SIGPROCMASK@ 179# if !@HAVE_POSIX_SIGNALBLOCKING@ 180 181# ifndef GNULIB_defined_signal_blocking 182# define GNULIB_defined_signal_blocking 1 183# endif 184 185/* Maximum signal number + 1. */ 186# ifndef NSIG 187# define NSIG 32 188# endif 189 190/* This code supports only 32 signals. */ 191# if !GNULIB_defined_verify_NSIG_constraint 192typedef int verify_NSIG_constraint[NSIG <= 32 ? 1 : -1]; 193# define GNULIB_defined_verify_NSIG_constraint 1 194# endif 195 196# endif 197 198/* When also using extern inline, suppress the use of static inline in 199 standard headers of problematic Apple configurations, as Libc at 200 least through Libc-825.26 (2013-04-09) mishandles it; see, e.g., 201 <http://lists.gnu.org/archive/html/bug-gnulib/2012-12/msg00023.html>. 202 Perhaps Apple will fix this some day. */ 203#if (defined _GL_EXTERN_INLINE_IN_USE && defined __APPLE__ \ 204 && (defined __i386__ || defined __x86_64__)) 205# undef sigaddset 206# undef sigdelset 207# undef sigemptyset 208# undef sigfillset 209# undef sigismember 210#endif 211 212/* Test whether a given signal is contained in a signal set. */ 213# if @HAVE_POSIX_SIGNALBLOCKING@ 214/* This function is defined as a macro on Mac OS X. */ 215# if defined __cplusplus && defined GNULIB_NAMESPACE 216# undef sigismember 217# endif 218# else 219_GL_FUNCDECL_SYS (sigismember, int, (const sigset_t *set, int sig) 220 _GL_ARG_NONNULL ((1))); 221# endif 222_GL_CXXALIAS_SYS (sigismember, int, (const sigset_t *set, int sig)); 223_GL_CXXALIASWARN (sigismember); 224 225/* Initialize a signal set to the empty set. */ 226# if @HAVE_POSIX_SIGNALBLOCKING@ 227/* This function is defined as a macro on Mac OS X. */ 228# if defined __cplusplus && defined GNULIB_NAMESPACE 229# undef sigemptyset 230# endif 231# else 232_GL_FUNCDECL_SYS (sigemptyset, int, (sigset_t *set) _GL_ARG_NONNULL ((1))); 233# endif 234_GL_CXXALIAS_SYS (sigemptyset, int, (sigset_t *set)); 235_GL_CXXALIASWARN (sigemptyset); 236 237/* Add a signal to a signal set. */ 238# if @HAVE_POSIX_SIGNALBLOCKING@ 239/* This function is defined as a macro on Mac OS X. */ 240# if defined __cplusplus && defined GNULIB_NAMESPACE 241# undef sigaddset 242# endif 243# else 244_GL_FUNCDECL_SYS (sigaddset, int, (sigset_t *set, int sig) 245 _GL_ARG_NONNULL ((1))); 246# endif 247_GL_CXXALIAS_SYS (sigaddset, int, (sigset_t *set, int sig)); 248_GL_CXXALIASWARN (sigaddset); 249 250/* Remove a signal from a signal set. */ 251# if @HAVE_POSIX_SIGNALBLOCKING@ 252/* This function is defined as a macro on Mac OS X. */ 253# if defined __cplusplus && defined GNULIB_NAMESPACE 254# undef sigdelset 255# endif 256# else 257_GL_FUNCDECL_SYS (sigdelset, int, (sigset_t *set, int sig) 258 _GL_ARG_NONNULL ((1))); 259# endif 260_GL_CXXALIAS_SYS (sigdelset, int, (sigset_t *set, int sig)); 261_GL_CXXALIASWARN (sigdelset); 262 263/* Fill a signal set with all possible signals. */ 264# if @HAVE_POSIX_SIGNALBLOCKING@ 265/* This function is defined as a macro on Mac OS X. */ 266# if defined __cplusplus && defined GNULIB_NAMESPACE 267# undef sigfillset 268# endif 269# else 270_GL_FUNCDECL_SYS (sigfillset, int, (sigset_t *set) _GL_ARG_NONNULL ((1))); 271# endif 272_GL_CXXALIAS_SYS (sigfillset, int, (sigset_t *set)); 273_GL_CXXALIASWARN (sigfillset); 274 275/* Return the set of those blocked signals that are pending. */ 276# if !@HAVE_POSIX_SIGNALBLOCKING@ 277_GL_FUNCDECL_SYS (sigpending, int, (sigset_t *set) _GL_ARG_NONNULL ((1))); 278# endif 279_GL_CXXALIAS_SYS (sigpending, int, (sigset_t *set)); 280_GL_CXXALIASWARN (sigpending); 281 282/* If OLD_SET is not NULL, put the current set of blocked signals in *OLD_SET. 283 Then, if SET is not NULL, affect the current set of blocked signals by 284 combining it with *SET as indicated in OPERATION. 285 In this implementation, you are not allowed to change a signal handler 286 while the signal is blocked. */ 287# if !@HAVE_POSIX_SIGNALBLOCKING@ 288# define SIG_BLOCK 0 /* blocked_set = blocked_set | *set; */ 289# define SIG_SETMASK 1 /* blocked_set = *set; */ 290# define SIG_UNBLOCK 2 /* blocked_set = blocked_set & ~*set; */ 291_GL_FUNCDECL_SYS (sigprocmask, int, 292 (int operation, const sigset_t *set, sigset_t *old_set)); 293# endif 294_GL_CXXALIAS_SYS (sigprocmask, int, 295 (int operation, const sigset_t *set, sigset_t *old_set)); 296_GL_CXXALIASWARN (sigprocmask); 297 298/* Install the handler FUNC for signal SIG, and return the previous 299 handler. */ 300# ifdef __cplusplus 301extern "C" { 302# endif 303# if !GNULIB_defined_function_taking_int_returning_void_t 304typedef void (*_gl_function_taking_int_returning_void_t) (int); 305# define GNULIB_defined_function_taking_int_returning_void_t 1 306# endif 307# ifdef __cplusplus 308} 309# endif 310# if !@HAVE_POSIX_SIGNALBLOCKING@ 311# if !(defined __cplusplus && defined GNULIB_NAMESPACE) 312# define signal rpl_signal 313# endif 314_GL_FUNCDECL_RPL (signal, _gl_function_taking_int_returning_void_t, 315 (int sig, _gl_function_taking_int_returning_void_t func)); 316_GL_CXXALIAS_RPL (signal, _gl_function_taking_int_returning_void_t, 317 (int sig, _gl_function_taking_int_returning_void_t func)); 318# else 319_GL_CXXALIAS_SYS (signal, _gl_function_taking_int_returning_void_t, 320 (int sig, _gl_function_taking_int_returning_void_t func)); 321# endif 322_GL_CXXALIASWARN (signal); 323 324# if !@HAVE_POSIX_SIGNALBLOCKING@ && GNULIB_defined_SIGPIPE 325/* Raise signal SIGPIPE. */ 326_GL_EXTERN_C int _gl_raise_SIGPIPE (void); 327# endif 328 329#elif defined GNULIB_POSIXCHECK 330# undef sigaddset 331# if HAVE_RAW_DECL_SIGADDSET 332_GL_WARN_ON_USE (sigaddset, "sigaddset is unportable - " 333 "use the gnulib module sigprocmask for portability"); 334# endif 335# undef sigdelset 336# if HAVE_RAW_DECL_SIGDELSET 337_GL_WARN_ON_USE (sigdelset, "sigdelset is unportable - " 338 "use the gnulib module sigprocmask for portability"); 339# endif 340# undef sigemptyset 341# if HAVE_RAW_DECL_SIGEMPTYSET 342_GL_WARN_ON_USE (sigemptyset, "sigemptyset is unportable - " 343 "use the gnulib module sigprocmask for portability"); 344# endif 345# undef sigfillset 346# if HAVE_RAW_DECL_SIGFILLSET 347_GL_WARN_ON_USE (sigfillset, "sigfillset is unportable - " 348 "use the gnulib module sigprocmask for portability"); 349# endif 350# undef sigismember 351# if HAVE_RAW_DECL_SIGISMEMBER 352_GL_WARN_ON_USE (sigismember, "sigismember is unportable - " 353 "use the gnulib module sigprocmask for portability"); 354# endif 355# undef sigpending 356# if HAVE_RAW_DECL_SIGPENDING 357_GL_WARN_ON_USE (sigpending, "sigpending is unportable - " 358 "use the gnulib module sigprocmask for portability"); 359# endif 360# undef sigprocmask 361# if HAVE_RAW_DECL_SIGPROCMASK 362_GL_WARN_ON_USE (sigprocmask, "sigprocmask is unportable - " 363 "use the gnulib module sigprocmask for portability"); 364# endif 365#endif /* @GNULIB_SIGPROCMASK@ */ 366 367 368#if @GNULIB_SIGACTION@ 369# if !@HAVE_SIGACTION@ 370 371# if !@HAVE_SIGINFO_T@ 372 373# if !GNULIB_defined_siginfo_types 374 375/* Present to allow compilation, but unsupported by gnulib. */ 376union sigval 377{ 378 int sival_int; 379 void *sival_ptr; 380}; 381 382/* Present to allow compilation, but unsupported by gnulib. */ 383struct siginfo_t 384{ 385 int si_signo; 386 int si_code; 387 int si_errno; 388 pid_t si_pid; 389 uid_t si_uid; 390 void *si_addr; 391 int si_status; 392 long si_band; 393 union sigval si_value; 394}; 395typedef struct siginfo_t siginfo_t; 396 397# define GNULIB_defined_siginfo_types 1 398# endif 399 400# endif /* !@HAVE_SIGINFO_T@ */ 401 402/* We assume that platforms which lack the sigaction() function also lack 403 the 'struct sigaction' type, and vice versa. */ 404 405# if !GNULIB_defined_struct_sigaction 406 407struct sigaction 408{ 409 union 410 { 411 void (*_sa_handler) (int); 412 /* Present to allow compilation, but unsupported by gnulib. POSIX 413 says that implementations may, but not must, make sa_sigaction 414 overlap with sa_handler, but we know of no implementation where 415 they do not overlap. */ 416 void (*_sa_sigaction) (int, siginfo_t *, void *); 417 } _sa_func; 418 sigset_t sa_mask; 419 /* Not all POSIX flags are supported. */ 420 int sa_flags; 421}; 422# define sa_handler _sa_func._sa_handler 423# define sa_sigaction _sa_func._sa_sigaction 424/* Unsupported flags are not present. */ 425# define SA_RESETHAND 1 426# define SA_NODEFER 2 427# define SA_RESTART 4 428 429# define GNULIB_defined_struct_sigaction 1 430# endif 431 432_GL_FUNCDECL_SYS (sigaction, int, (int, const struct sigaction *restrict, 433 struct sigaction *restrict)); 434 435# elif !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@ 436 437# define sa_sigaction sa_handler 438 439# endif /* !@HAVE_SIGACTION@, !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@ */ 440 441_GL_CXXALIAS_SYS (sigaction, int, (int, const struct sigaction *restrict, 442 struct sigaction *restrict)); 443_GL_CXXALIASWARN (sigaction); 444 445#elif defined GNULIB_POSIXCHECK 446# undef sigaction 447# if HAVE_RAW_DECL_SIGACTION 448_GL_WARN_ON_USE (sigaction, "sigaction is unportable - " 449 "use the gnulib module sigaction for portability"); 450# endif 451#endif 452 453/* Some systems don't have SA_NODEFER. */ 454#ifndef SA_NODEFER 455# define SA_NODEFER 0 456#endif 457 458 459#endif /* _@GUARD_PREFIX@_SIGNAL_H */ 460#endif /* _@GUARD_PREFIX@_SIGNAL_H */ 461#endif 462