2 * <signal.h> wrapper functions.
5 * Jonathan Pryor (jonpryor@vt.edu)
6 * Jonathan Pryor (jpryor@novell.com)
7 * Tim Jenks (tim.jenks@realtimeworlds.com)
9 * Copyright (C) 2004-2005 Jonathan Pryor
10 * Copyright (C) 2008 Novell, Inc.
20 #include <sys/types.h>
21 #if defined(__APPLE__)
30 #include <mono/io-layer/atomic.h>
31 #include <mono/metadata/appdomain.h>
36 typedef void (*mph_sighandler_t)(int);
37 typedef struct Mono_Unix_UnixSignal_SignalInfo signal_info;
39 static int count_handlers (int signum);
42 Mono_Posix_Stdlib_SIG_DFL (void)
48 Mono_Posix_Stdlib_SIG_ERR (void)
54 Mono_Posix_Stdlib_SIG_IGN (void)
60 Mono_Posix_Stdlib_InvokeSignalHandler (int signum, void *handler)
62 mph_sighandler_t _h = (mph_sighandler_t) handler;
66 int Mono_Posix_SIGRTMIN (void)
70 #else /* def SIGRTMIN */
72 #endif /* ndef SIGRTMIN */
75 int Mono_Posix_SIGRTMAX (void)
79 #else /* def SIGRTMAX */
81 #endif /* ndef SIGRTMAX */
84 int Mono_Posix_FromRealTimeSignum (int offset, int *r)
91 #if defined (SIGRTMIN) && defined (SIGRTMAX)
92 if ((offset < 0) || (SIGRTMIN > SIGRTMAX - offset)) {
98 #else /* defined (SIGRTMIN) && defined (SIGRTMAX) */
103 #endif /* defined (SIGRTMIN) && defined (SIGRTMAX) */
108 #ifdef WAPI_ATOMIC_ASM
109 #define mph_int_get(p) InterlockedExchangeAdd ((p), 0)
110 #define mph_int_inc(p) InterlockedIncrement ((p))
111 #define mph_int_dec_test(p) (InterlockedDecrement ((p)) == 0)
112 #define mph_int_set(p,o,n) InterlockedExchange ((p), (n))
113 #elif GLIB_CHECK_VERSION(2,4,0)
114 #define mph_int_get(p) g_atomic_int_get ((p))
115 #define mph_int_inc(p) do {g_atomic_int_inc ((p));} while (0)
116 #define mph_int_dec_test(p) g_atomic_int_dec_and_test ((p))
117 #define mph_int_set(p,o,n) do { \
118 while (!g_atomic_int_compare_and_exchange ((p), (o), (n))) {} \
121 #define mph_int_get(p) (*(p))
122 #define mph_int_inc(p) do { (*(p))++; } while (0)
123 #define mph_int_dec_test(p) (--(*(p)) == 0)
124 #define mph_int_set(p,o,n) do { *(p) = n; } while (0)
129 Mono_Posix_Syscall_psignal (int sig, const char* s)
133 return errno == 0 ? 0 : -1;
135 #endif /* def HAVE_PSIGNAL */
137 #define NUM_SIGNALS 64
138 static signal_info signals[NUM_SIGNALS];
140 static int acquire_mutex (pthread_mutex_t *mutex)
143 while ((mr = pthread_mutex_lock (mutex)) == EAGAIN) {
144 /* try to acquire again */
146 if ((mr != 0) && (mr != EDEADLK)) {
153 static void release_mutex (pthread_mutex_t *mutex)
156 while ((mr = pthread_mutex_unlock (mutex)) == EAGAIN) {
157 /* try to release mutex again */
164 return r == -1 && errno == EINTR;
168 default_handler (int signum)
171 for (i = 0; i < NUM_SIGNALS; ++i) {
173 signal_info* h = &signals [i];
174 if (mph_int_get (&h->signum) != signum)
176 mph_int_inc (&h->count);
177 fd = mph_int_get (&h->write_fd);
181 pipecounter = mph_int_get (&h->pipecnt);
182 for (j = 0; j < pipecounter; ++j) {
184 do { r = write (fd, &c, 1); } while (keep_trying (r));
185 fsync (fd); /* force */
191 static pthread_mutex_t signals_mutex = PTHREAD_MUTEX_INITIALIZER;
194 Mono_Unix_UnixSignal_install (int sig)
197 signal_info* h = NULL;
198 int have_handler = 0;
199 void* handler = NULL;
201 if (acquire_mutex (&signals_mutex) == -1)
204 #if defined (SIGRTMIN) && defined (SIGRTMAX)
205 /*The runtime uses some rt signals for itself so it's important to not override them.*/
206 if (sig >= SIGRTMIN && sig <= SIGRTMAX && count_handlers (sig) == 0) {
207 struct sigaction sinfo;
208 sigaction (sig, NULL, &sinfo);
209 if (sinfo.sa_handler != SIG_DFL || (void*)sinfo.sa_sigaction != (void*)SIG_DFL) {
210 pthread_mutex_unlock (&signals_mutex);
215 #endif /*defined (SIGRTMIN) && defined (SIGRTMAX)*/
217 for (i = 0; i < NUM_SIGNALS; ++i) {
218 if (h == NULL && signals [i].signum == 0) {
220 h->handler = signal (sig, default_handler);
221 if (h->handler == SIG_ERR) {
230 if (!have_handler && signals [i].signum == sig &&
231 signals [i].handler != default_handler) {
233 handler = signals [i].handler;
235 if (h && have_handler)
239 if (h && have_handler) {
241 h->handler = handler;
245 mph_int_set (&h->count, h->count, 0);
246 mph_int_set (&h->signum, h->signum, sig);
247 mph_int_set (&h->pipecnt, h->pipecnt, 0);
250 release_mutex (&signals_mutex);
256 count_handlers (int signum)
260 for (i = 0; i < NUM_SIGNALS; ++i) {
261 if (signals [i].signum == signum)
268 Mono_Unix_UnixSignal_uninstall (void* info)
273 if (acquire_mutex (&signals_mutex) == -1)
278 if (h == NULL || h < signals || h > &signals [NUM_SIGNALS])
281 /* last UnixSignal -- we can unregister */
282 if (h->have_handler && count_handlers (h->signum) == 1) {
283 mph_sighandler_t p = signal (h->signum, h->handler);
292 release_mutex (&signals_mutex);
298 setup_pipes (signal_info** signals, int count, struct pollfd *fd_structs, int *currfd)
302 for (i = 0; i < count; ++i) {
308 if (mph_int_get (&h->pipecnt) == 0) {
309 if ((r = pipe (filedes)) != 0) {
312 h->read_fd = filedes [0];
313 h->write_fd = filedes [1];
315 mph_int_inc (&h->pipecnt);
316 fd_structs[*currfd].fd = h->read_fd;
317 fd_structs[*currfd].events = POLLIN;
324 teardown_pipes (signal_info** signals, int count)
327 for (i = 0; i < count; ++i) {
328 signal_info* h = signals [i];
330 if (mph_int_dec_test (&h->pipecnt)) {
333 if (h->write_fd != 0)
342 wait_for_any (signal_info** signals, int count, int *currfd, struct pollfd* fd_structs, int timeout, Mono_Posix_RuntimeIsShuttingDown shutting_down)
347 struct timeval *ptv = NULL;
349 tv.tv_sec = timeout / 1000;
350 tv.tv_usec = (timeout % 1000)*1000;
353 r = poll (fd_structs, count, timeout);
354 } while (keep_trying (r) && !shutting_down ());
361 for (i = 0; i < count; ++i) {
362 signal_info* h = signals [i];
363 if (fd_structs[i].revents & POLLIN) {
367 r = read (h->read_fd, &c, 1);
368 } while (keep_trying (r) && !shutting_down ());
379 * returns: -1 on error:
381 * index into _signals array of signal that was generated on success
384 Mono_Unix_UnixSignal_WaitAny (void** _signals, int count, int timeout /* milliseconds */, Mono_Posix_RuntimeIsShuttingDown shutting_down)
388 struct pollfd fd_structs[NUM_SIGNALS];
390 signal_info** signals = (signal_info**) _signals;
392 if (count > NUM_SIGNALS)
395 if (acquire_mutex (&signals_mutex) == -1)
398 r = setup_pipes (signals, count, &fd_structs[0], &currfd);
400 release_mutex (&signals_mutex);
403 r = wait_for_any (signals, count, &currfd, &fd_structs[0], timeout, shutting_down);
406 if (acquire_mutex (&signals_mutex) == -1)
409 teardown_pipes (signals, count);
411 release_mutex (&signals_mutex);
416 #endif /* ndef HOST_WIN32 */