lib/signal.in.h

   1 /* A GNU-like <signal.h>.
   2
   3    Copyright (C) 2006-2015 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
  78 typedef 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
  88 typedef 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
  96 extern "C" {
  97 # endif
  98 # if !GNULIB_defined_sighandler_t
  99 typedef 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
 192 typedef 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
 301 extern "C" {
 302 # endif
 303 # if !GNULIB_defined_function_taking_int_returning_void_t
 304 typedef 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.  */
 376 union sigval
 377 {
 378   int sival_int;
 379   void *sival_ptr;
 380 };
 381
 382 /* Present to allow compilation, but unsupported by gnulib.  */
 383 struct 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 };
 395 typedef 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
 407 struct 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