Windows: Implement setitimer() and sigaction().

The timer is implemented using a thread that calls the signal handler
at regular intervals.

We also replace Windows's signal() function because we must intercept
that SIGALRM is set (which is used when a timer is canceled).

Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>

diff --git a/compat/mingw.c b/compat/mingw.c
index 57af486b7a456e404b60352dc9abffa5b1a47a5d..3ffff75ba657f6989c8edde0e948569e9d60636d 100644 (file)
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -125,12 +125,120 @@ struct passwd *getpwuid(int uid)
        return &p;
 }
 
+static HANDLE timer_event;
+static HANDLE timer_thread;
+static int timer_interval;
+static int one_shot;
+static sig_handler_t timer_fn = SIG_DFL;
+
+/* The timer works like this:
+ * The thread, ticktack(), is a trivial routine that most of the time
+ * only waits to receive the signal to terminate. The main thread tells
+ * the thread to terminate by setting the timer_event to the signalled
+ * state.
+ * But ticktack() interrupts the wait state after the timer's interval
+ * length to call the signal handler.
+ */
+
+static __stdcall unsigned ticktack(void *dummy)
+{
+       while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
+               if (timer_fn == SIG_DFL)
+                       die("Alarm");
+               if (timer_fn != SIG_IGN)
+                       timer_fn(SIGALRM);
+               if (one_shot)
+                       break;
+       }
+       return 0;
+}
+
+static int start_timer_thread(void)
+{
+       timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
+       if (timer_event) {
+               timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
+               if (!timer_thread )
+                       return errno = ENOMEM,
+                               error("cannot start timer thread");
+       } else
+               return errno = ENOMEM,
+                       error("cannot allocate resources for timer");
+       return 0;
+}
+
+static void stop_timer_thread(void)
+{
+       if (timer_event)
+               SetEvent(timer_event);  /* tell thread to terminate */
+       if (timer_thread) {
+               int rc = WaitForSingleObject(timer_thread, 1000);
+               if (rc == WAIT_TIMEOUT)
+                       error("timer thread did not terminate timely");
+               else if (rc != WAIT_OBJECT_0)
+                       error("waiting for timer thread failed: %lu",
+                             GetLastError());
+               CloseHandle(timer_thread);
+       }
+       if (timer_event)
+               CloseHandle(timer_event);
+       timer_event = NULL;
+       timer_thread = NULL;
+}
+
+static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
+{
+       return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
+}
+
 int setitimer(int type, struct itimerval *in, struct itimerval *out)
 {
-       return -1;
+       static const struct timeval zero;
+       static int atexit_done;
+
+       if (out != NULL)
+               return errno = EINVAL,
+                       error("setitimer param 3 != NULL not implemented");
+       if (!is_timeval_eq(&in->it_interval, &zero) &&
+           !is_timeval_eq(&in->it_interval, &in->it_value))
+               return errno = EINVAL,
+                       error("setitimer: it_interval must be zero or eq it_value");
+
+       if (timer_thread)
+               stop_timer_thread();
+
+       if (is_timeval_eq(&in->it_value, &zero) &&
+           is_timeval_eq(&in->it_interval, &zero))
+               return 0;
+
+       timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
+       one_shot = is_timeval_eq(&in->it_interval, &zero);
+       if (!atexit_done) {
+               atexit(stop_timer_thread);
+               atexit_done = 1;
+       }
+       return start_timer_thread();
 }
 
 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
 {
-       return -1;
+       if (sig != SIGALRM)
+               return errno = EINVAL,
+                       error("sigaction only implemented for SIGALRM");
+       if (out != NULL)
+               return errno = EINVAL,
+                       error("sigaction: param 3 != NULL not implemented");
+
+       timer_fn = in->sa_handler;
+       return 0;
+}
+
+#undef signal
+sig_handler_t mingw_signal(int sig, sig_handler_t handler)
+{
+       if (sig != SIGALRM)
+               return signal(sig, handler);
+       sig_handler_t old = timer_fn;
+       timer_fn = handler;
+       return old;
 }

diff --git a/compat/mingw.h b/compat/mingw.h
index fad855ef99549d0ee36f9272cbaa76419d8058b6..a369ade9e2bff4f0378e34fcebb70c03df584f6c 100644 (file)
--- a/compat/mingw.h
+++ b/compat/mingw.h
@@ -154,6 +154,9 @@ char *mingw_getcwd(char *pointer, int len);
 int mingw_rename(const char*, const char*);
 #define rename mingw_rename
 
+sig_handler_t mingw_signal(int sig, sig_handler_t handler);
+#define signal mingw_signal
+
 /*
  * git specific compatibility
  */