summaryrefslogtreecommitdiffstats
path: root/lib/timer.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/timer.c')
-rw-r--r--lib/timer.c98
1 files changed, 98 insertions, 0 deletions
diff --git a/lib/timer.c b/lib/timer.c
new file mode 100644
index 0000000..cfa18f6
--- /dev/null
+++ b/lib/timer.c
@@ -0,0 +1,98 @@
+/*
+ * No copyright is claimed. This code is in the public domain; do with
+ * it what you wish.
+ *
+ * Please, don't add this file to libcommon because timers requires
+ * -lrt on systems with old libc (and probably also -lpthread for static
+ * build).
+ */
+#include <time.h>
+#include <signal.h>
+#include <sys/time.h>
+
+#include "c.h"
+#include "timer.h"
+
+/*
+ * Note the timeout is used for the first signal, then the signal is send
+ * repeatedly in interval ~1% of the original timeout to avoid race in signal
+ * handling -- for example you want to use timer to define timeout for a
+ * syscall:
+ *
+ * setup_timer()
+ * syscall()
+ * cancel_timer()
+ *
+ * if the timeout is too short than it's possible that the signal is delivered
+ * before application enter the syscall function. For this reason timer send
+ * the signal repeatedly.
+ *
+ * The applications need to ensure that they can tolerate multiple signal
+ * deliveries.
+ */
+#ifdef HAVE_TIMER_CREATE
+int setup_timer(struct ul_timer *timer,
+ struct itimerval *timeout,
+ void (*timeout_handler)(int, siginfo_t *, void *))
+{
+ time_t sec = timeout->it_value.tv_sec;
+ long usec = timeout->it_value.tv_usec;
+ struct sigaction sig_a;
+ static struct sigevent sig_e = {
+ .sigev_notify = SIGEV_SIGNAL,
+ .sigev_signo = SIGALRM
+ };
+ struct itimerspec val = {
+ .it_value.tv_sec = sec,
+ .it_value.tv_nsec = usec * 1000,
+ .it_interval.tv_sec = sec / 100,
+ .it_interval.tv_nsec = (sec ? sec % 100 : 1) * 10*1000*1000
+ };
+
+ if (sigemptyset(&sig_a.sa_mask))
+ return 1;
+
+ sig_a.sa_flags = SA_SIGINFO;
+ sig_a.sa_sigaction = timeout_handler;
+
+ if (sigaction(SIGALRM, &sig_a, NULL))
+ return 1;
+ if (timer_create(CLOCK_MONOTONIC, &sig_e, &timer->t_id))
+ return 1;
+ if (timer_settime(timer->t_id, 0, &val, NULL))
+ return 1;
+ return 0;
+}
+void cancel_timer(struct ul_timer *timer)
+{
+ timer_delete(timer->t_id);
+}
+
+#else /* !HAVE_TIMER_CREATE */
+
+int setup_timer(struct ul_timer *timer,
+ struct itimerval *timeout,
+ void (*timeout_handler)(int, siginfo_t *, void *))
+{
+ struct sigaction sa;
+
+ memset(&sa, 0, sizeof sa);
+ memset(timer, 0, sizeof(*timer));
+
+ sa.sa_flags = SA_SIGINFO | SA_RESETHAND;
+ sa.sa_sigaction = timeout_handler;
+
+ if (sigaction(SIGALRM, &sa, &timer->old_sa))
+ return 1;
+ if (setitimer(ITIMER_REAL, timeout, &timer->old_timer) != 0)
+ return 1;
+ return 0;
+}
+
+void cancel_timer(struct ul_timer *timer)
+{
+ setitimer(ITIMER_REAL, &timer->old_timer, NULL);
+ sigaction(SIGALRM, &timer->old_sa, NULL);
+
+}
+#endif /* !HAVE_TIMER_CREATE */