2 * <signal.h> wrapper functions.
5 * Jonathan Pryor (jonpryor@vt.edu)
6 * Jonathan Pryor (jpryor@novell.com)
8 * Copyright (C) 2004-2005 Jonathan Pryor
9 * Copyright (C) 2008 Novell, Inc.
17 #ifndef PLATFORM_WIN32
19 #include <sys/types.h>
24 #include <mono/io-layer/atomic.h>
29 typedef void (*mph_sighandler_t)(int);
30 typedef struct Mono_Unix_UnixSignal_SignalInfo signal_info;
33 Mono_Posix_Stdlib_SIG_DFL (void)
39 Mono_Posix_Stdlib_SIG_ERR (void)
45 Mono_Posix_Stdlib_SIG_IGN (void)
51 Mono_Posix_Stdlib_InvokeSignalHandler (int signum, void *handler)
53 mph_sighandler_t _h = (mph_sighandler_t) handler;
57 #ifndef PLATFORM_WIN32
59 #ifdef WAPI_ATOMIC_ASM
60 #define mph_int_get(p) InterlockedExchangeAdd ((p), 0)
61 #define mph_int_inc(p) InterlockedIncrement ((p))
62 #define mph_int_set(p,o,n) InterlockedExchange ((p), (n))
63 #elif GLIB_CHECK_VERSION(2,4,0)
64 #define mph_int_get(p) g_atomic_int_get ((p))
65 #define mph_int_inc(p) do {g_atomic_int_inc ((p));} while (0)
66 #define mph_int_set(p,o,n) do { \
67 while (!g_atomic_int_compare_and_exchange ((p), (o), (n))) {} \
70 #define mph_int_get(p) (*(p))
71 #define mph_int_inc(p) do { (*(p))++; } while (0)
72 #define mph_int_set(p,o,n) do { *(p) = n; } while (0)
76 Mono_Posix_Syscall_psignal (int sig, const char* s)
80 return errno == 0 ? 0 : -1;
83 #define NUM_SIGNALS 64
84 static signal_info signals[NUM_SIGNALS];
87 default_handler (int signum)
90 for (i = 0; i < NUM_SIGNALS; ++i) {
92 signal_info* h = &signals [i];
93 if (mph_int_get (&h->signum) != signum)
95 mph_int_inc (&h->count);
96 fd = mph_int_get (&h->write_fd);
104 static pthread_mutex_t signals_mutex = PTHREAD_MUTEX_INITIALIZER;
107 Mono_Unix_UnixSignal_install (int sig)
110 signal_info* h = NULL;
111 int have_handler = 0;
114 mr = pthread_mutex_lock (&signals_mutex);
120 for (i = 0; i < NUM_SIGNALS; ++i) {
121 if (h == NULL && signals [i].signum == 0) {
123 h->handler = signal (sig, default_handler);
124 if (h->handler == SIG_ERR) {
133 if (!have_handler && signals [i].signum == sig &&
134 signals [i].handler != default_handler) {
136 handler = signals [i].handler;
138 if (h && have_handler)
142 if (h && have_handler) {
144 h->handler = handler;
148 mph_int_set (&h->count, h->count, 0);
149 mph_int_set (&h->signum, h->signum, sig);
152 pthread_mutex_unlock (&signals_mutex);
158 count_handlers (int signum)
162 for (i = 0; i < NUM_SIGNALS; ++i) {
163 if (signals [i].signum == signum)
170 Mono_Unix_UnixSignal_uninstall (void* info)
175 mr = pthread_mutex_lock (&signals_mutex);
183 if (h == NULL || h < signals || h > &signals [NUM_SIGNALS])
186 /* last UnixSignal -- we can unregister */
187 if (h->have_handler && count_handlers (h->signum) == 1) {
188 mph_sighandler_t p = signal (h->signum, h->handler);
197 pthread_mutex_unlock (&signals_mutex);
203 setup_pipes (signal_info** signals, int count, fd_set *read_fds, int *max_fd)
206 for (i = 0; i < count; ++i) {
210 if ((r = pipe (filedes)) != 0) {
214 h->read_fd = filedes [0];
215 h->write_fd = filedes [1];
216 if (h->read_fd > *max_fd)
217 *max_fd = h->read_fd;
218 FD_SET (h->read_fd, read_fds);
224 teardown_pipes (signal_info** signals, int count)
227 for (i = 0; i < count; ++i) {
228 signal_info* h = signals [i];
231 if (h->write_fd != 0)
239 wait_for_any (signal_info** signals, int count, int max_fd, fd_set* read_fds, int timeout)
244 struct timeval *ptv = NULL;
246 tv.tv_sec = timeout / 1000;
247 tv.tv_usec = (timeout % 1000)*1000;
251 r = select (max_fd + 1, read_fds, NULL, NULL, ptv);
252 } while (r == -1 && errno == EINTR);
259 for (i = 0; i < count; ++i) {
260 signal_info* h = signals [i];
261 if (FD_ISSET (h->read_fd, read_fds)) {
263 read (h->read_fd, &c, 1); /* ignore any error */
274 * returns: -1 on error:
276 * index into _signals array of signal that was generated on success
279 Mono_Unix_UnixSignal_WaitAny (void** _signals, int count, int timeout /* milliseconds */)
285 signal_info** signals = (signal_info**) _signals;
287 mr = pthread_mutex_lock (&signals_mutex);
295 r = setup_pipes (signals, count, &read_fds, &max_fd);
297 r = wait_for_any (signals, count, max_fd, &read_fds, timeout);
299 teardown_pipes (signals, count);
301 pthread_mutex_unlock (&signals_mutex);
306 #endif /* ndef PLATFORM_WIN32 */