1: /* A GNU-like <signal.h>.
2:
3: Copyright (C) 2006-2011 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: /* MacOS 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_SIGPROCMASK@
156: # if !@HAVE_POSIX_SIGNALBLOCKING@
157:
158: /* Maximum signal number + 1. */
159: # ifndef NSIG
160: # define NSIG 32
161: # endif
162:
163: /* This code supports only 32 signals. */
164: # if !GNULIB_defined_verify_NSIG_constraint
165: typedef int verify_NSIG_constraint[NSIG <= 32 ? 1 : -1];
166: # define GNULIB_defined_verify_NSIG_constraint 1
167: # endif
168:
169: # endif
170:
171: /* Test whether a given signal is contained in a signal set. */
172: # if @HAVE_POSIX_SIGNALBLOCKING@
173: /* This function is defined as a macro on MacOS X. */
174: # if defined __cplusplus && defined GNULIB_NAMESPACE
175: # undef sigismember
176: # endif
177: # else
178: _GL_FUNCDECL_SYS (sigismember, int, (const sigset_t *set, int sig)
179: _GL_ARG_NONNULL ((1)));
180: # endif
181: _GL_CXXALIAS_SYS (sigismember, int, (const sigset_t *set, int sig));
182: _GL_CXXALIASWARN (sigismember);
183:
184: /* Initialize a signal set to the empty set. */
185: # if @HAVE_POSIX_SIGNALBLOCKING@
186: /* This function is defined as a macro on MacOS X. */
187: # if defined __cplusplus && defined GNULIB_NAMESPACE
188: # undef sigemptyset
189: # endif
190: # else
191: _GL_FUNCDECL_SYS (sigemptyset, int, (sigset_t *set) _GL_ARG_NONNULL ((1)));
192: # endif
193: _GL_CXXALIAS_SYS (sigemptyset, int, (sigset_t *set));
194: _GL_CXXALIASWARN (sigemptyset);
195:
196: /* Add a signal to a signal set. */
197: # if @HAVE_POSIX_SIGNALBLOCKING@
198: /* This function is defined as a macro on MacOS X. */
199: # if defined __cplusplus && defined GNULIB_NAMESPACE
200: # undef sigaddset
201: # endif
202: # else
203: _GL_FUNCDECL_SYS (sigaddset, int, (sigset_t *set, int sig)
204: _GL_ARG_NONNULL ((1)));
205: # endif
206: _GL_CXXALIAS_SYS (sigaddset, int, (sigset_t *set, int sig));
207: _GL_CXXALIASWARN (sigaddset);
208:
209: /* Remove a signal from a signal set. */
210: # if @HAVE_POSIX_SIGNALBLOCKING@
211: /* This function is defined as a macro on MacOS X. */
212: # if defined __cplusplus && defined GNULIB_NAMESPACE
213: # undef sigdelset
214: # endif
215: # else
216: _GL_FUNCDECL_SYS (sigdelset, int, (sigset_t *set, int sig)
217: _GL_ARG_NONNULL ((1)));
218: # endif
219: _GL_CXXALIAS_SYS (sigdelset, int, (sigset_t *set, int sig));
220: _GL_CXXALIASWARN (sigdelset);
221:
222: /* Fill a signal set with all possible signals. */
223: # if @HAVE_POSIX_SIGNALBLOCKING@
224: /* This function is defined as a macro on MacOS X. */
225: # if defined __cplusplus && defined GNULIB_NAMESPACE
226: # undef sigfillset
227: # endif
228: # else
229: _GL_FUNCDECL_SYS (sigfillset, int, (sigset_t *set) _GL_ARG_NONNULL ((1)));
230: # endif
231: _GL_CXXALIAS_SYS (sigfillset, int, (sigset_t *set));
232: _GL_CXXALIASWARN (sigfillset);
233:
234: /* Return the set of those blocked signals that are pending. */
235: # if !@HAVE_POSIX_SIGNALBLOCKING@
236: _GL_FUNCDECL_SYS (sigpending, int, (sigset_t *set) _GL_ARG_NONNULL ((1)));
237: # endif
238: _GL_CXXALIAS_SYS (sigpending, int, (sigset_t *set));
239: _GL_CXXALIASWARN (sigpending);
240:
241: /* If OLD_SET is not NULL, put the current set of blocked signals in *OLD_SET.
242: Then, if SET is not NULL, affect the current set of blocked signals by
243: combining it with *SET as indicated in OPERATION.
244: In this implementation, you are not allowed to change a signal handler
245: while the signal is blocked. */
246: # if !@HAVE_POSIX_SIGNALBLOCKING@
247: # define SIG_BLOCK 0 /* blocked_set = blocked_set | *set; */
248: # define SIG_SETMASK 1 /* blocked_set = *set; */
249: # define SIG_UNBLOCK 2 /* blocked_set = blocked_set & ~*set; */
250: _GL_FUNCDECL_SYS (sigprocmask, int,
251: (int operation, const sigset_t *set, sigset_t *old_set));
252: # endif
253: _GL_CXXALIAS_SYS (sigprocmask, int,
254: (int operation, const sigset_t *set, sigset_t *old_set));
255: _GL_CXXALIASWARN (sigprocmask);
256:
257: /* Install the handler FUNC for signal SIG, and return the previous
258: handler. */
259: # ifdef __cplusplus
260: extern "C" {
261: # endif
262: # if !GNULIB_defined_function_taking_int_returning_void_t
263: typedef void (*_gl_function_taking_int_returning_void_t) (int);
264: # define GNULIB_defined_function_taking_int_returning_void_t 1
265: # endif
266: # ifdef __cplusplus
267: }
268: # endif
269: # if !@HAVE_POSIX_SIGNALBLOCKING@
270: # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
271: # define signal rpl_signal
272: # endif
273: _GL_FUNCDECL_RPL (signal, _gl_function_taking_int_returning_void_t,
274: (int sig, _gl_function_taking_int_returning_void_t func));
275: _GL_CXXALIAS_RPL (signal, _gl_function_taking_int_returning_void_t,
276: (int sig, _gl_function_taking_int_returning_void_t func));
277: # else
278: _GL_CXXALIAS_SYS (signal, _gl_function_taking_int_returning_void_t,
279: (int sig, _gl_function_taking_int_returning_void_t func));
280: # endif
281: _GL_CXXALIASWARN (signal);
282:
283: /* Raise signal SIG. */
284: # if !@HAVE_POSIX_SIGNALBLOCKING@ && GNULIB_defined_SIGPIPE
285: # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
286: # undef raise
287: # define raise rpl_raise
288: # endif
289: _GL_FUNCDECL_RPL (raise, int, (int sig));
290: _GL_CXXALIAS_RPL (raise, int, (int sig));
291: # else
292: _GL_CXXALIAS_SYS (raise, int, (int sig));
293: # endif
294: _GL_CXXALIASWARN (raise);
295:
296: #elif defined GNULIB_POSIXCHECK
297: # undef sigaddset
298: # if HAVE_RAW_DECL_SIGADDSET
299: _GL_WARN_ON_USE (sigaddset, "sigaddset is unportable - "
300: "use the gnulib module sigprocmask for portability");
301: # endif
302: # undef sigdelset
303: # if HAVE_RAW_DECL_SIGDELSET
304: _GL_WARN_ON_USE (sigdelset, "sigdelset is unportable - "
305: "use the gnulib module sigprocmask for portability");
306: # endif
307: # undef sigemptyset
308: # if HAVE_RAW_DECL_SIGEMPTYSET
309: _GL_WARN_ON_USE (sigemptyset, "sigemptyset is unportable - "
310: "use the gnulib module sigprocmask for portability");
311: # endif
312: # undef sigfillset
313: # if HAVE_RAW_DECL_SIGFILLSET
314: _GL_WARN_ON_USE (sigfillset, "sigfillset is unportable - "
315: "use the gnulib module sigprocmask for portability");
316: # endif
317: # undef sigismember
318: # if HAVE_RAW_DECL_SIGISMEMBER
319: _GL_WARN_ON_USE (sigismember, "sigismember is unportable - "
320: "use the gnulib module sigprocmask for portability");
321: # endif
322: # undef sigpending
323: # if HAVE_RAW_DECL_SIGPENDING
324: _GL_WARN_ON_USE (sigpending, "sigpending is unportable - "
325: "use the gnulib module sigprocmask for portability");
326: # endif
327: # undef sigprocmask
328: # if HAVE_RAW_DECL_SIGPROCMASK
329: _GL_WARN_ON_USE (sigprocmask, "sigprocmask is unportable - "
330: "use the gnulib module sigprocmask for portability");
331: # endif
332: #endif /* @GNULIB_SIGPROCMASK@ */
333:
334:
335: #if @GNULIB_SIGACTION@
336: # if !@HAVE_SIGACTION@
337:
338: # if !@HAVE_SIGINFO_T@
339:
340: # if !GNULIB_defined_siginfo_types
341:
342: /* Present to allow compilation, but unsupported by gnulib. */
343: union sigval
344: {
345: int sival_int;
346: void *sival_ptr;
347: };
348:
349: /* Present to allow compilation, but unsupported by gnulib. */
350: struct siginfo_t
351: {
352: int si_signo;
353: int si_code;
354: int si_errno;
355: pid_t si_pid;
356: uid_t si_uid;
357: void *si_addr;
358: int si_status;
359: long si_band;
360: union sigval si_value;
361: };
362: typedef struct siginfo_t siginfo_t;
363:
364: # define GNULIB_defined_siginfo_types 1
365: # endif
366:
367: # endif /* !@HAVE_SIGINFO_T@ */
368:
369: /* We assume that platforms which lack the sigaction() function also lack
370: the 'struct sigaction' type, and vice versa. */
371:
372: # if !GNULIB_defined_struct_sigaction
373:
374: struct sigaction
375: {
376: union
377: {
378: void (*_sa_handler) (int);
379: /* Present to allow compilation, but unsupported by gnulib. POSIX
380: says that implementations may, but not must, make sa_sigaction
381: overlap with sa_handler, but we know of no implementation where
382: they do not overlap. */
383: void (*_sa_sigaction) (int, siginfo_t *, void *);
384: } _sa_func;
385: sigset_t sa_mask;
386: /* Not all POSIX flags are supported. */
387: int sa_flags;
388: };
389: # define sa_handler _sa_func._sa_handler
390: # define sa_sigaction _sa_func._sa_sigaction
391: /* Unsupported flags are not present. */
392: # define SA_RESETHAND 1
393: # define SA_NODEFER 2
394: # define SA_RESTART 4
395:
396: # define GNULIB_defined_struct_sigaction 1
397: # endif
398:
399: _GL_FUNCDECL_SYS (sigaction, int, (int, const struct sigaction *restrict,
400: struct sigaction *restrict));
401:
402: # elif !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@
403:
404: # define sa_sigaction sa_handler
405:
406: # endif /* !@HAVE_SIGACTION@, !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@ */
407:
408: _GL_CXXALIAS_SYS (sigaction, int, (int, const struct sigaction *restrict,
409: struct sigaction *restrict));
410: _GL_CXXALIASWARN (sigaction);
411:
412: #elif defined GNULIB_POSIXCHECK
413: # undef sigaction
414: # if HAVE_RAW_DECL_SIGACTION
415: _GL_WARN_ON_USE (sigaction, "sigaction is unportable - "
416: "use the gnulib module sigaction for portability");
417: # endif
418: #endif
419:
420: /* Some systems don't have SA_NODEFER. */
421: #ifndef SA_NODEFER
422: # define SA_NODEFER 0
423: #endif
424:
425:
426: #endif /* _@GUARD_PREFIX@_SIGNAL_H */
427: #endif /* _@GUARD_PREFIX@_SIGNAL_H */
428: #endif
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