uloop: ignore SIGPIPE by default

Most app don't want to crash because of unhandled SIGPIPE. It could
happen is such trivial situations like writing to socket.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

diff --git a/uloop.c b/uloop.c
index d4df6e210e36b534bea7b0d9e62b7c438c2641dc..9ebeca6791b97e313d8b3c82081c778f63fbe056 100644 (file)
--- a/uloop.c
+++ b/uloop.c
@@ -582,6 +582,28 @@ static void uloop_install_handler(int signum, void (*handler)(int), struct sigac
                sigaction(signum, act, NULL);
 }
 
+static void uloop_ignore_signal(int signum, bool ignore)
+{
+       struct sigaction s;
+       void *new_handler = NULL;
+
+       sigaction(signum, NULL, &s);
+
+       if (ignore) {
+               if (s.sa_handler == SIG_DFL) /* Ignore only if there isn't any custom handler */
+                       new_handler = SIG_IGN;
+       } else {
+               if (s.sa_handler == SIG_IGN) /* Restore only if noone modified our SIG_IGN */
+                       new_handler = SIG_DFL;
+       }
+
+       if (new_handler) {
+               s.sa_handler = new_handler;
+               s.sa_flags = 0;
+               sigaction(signum, &s, NULL);
+       }
+}
+
 static void uloop_setup_signals(bool add)
 {
        static struct sigaction old_sigint, old_sigchld, old_sigterm;
@@ -589,6 +611,8 @@ static void uloop_setup_signals(bool add)
        uloop_install_handler(SIGINT, uloop_handle_sigint, &old_sigint, add);
        uloop_install_handler(SIGTERM, uloop_handle_sigint, &old_sigterm, add);
        uloop_install_handler(SIGCHLD, uloop_sigchld, &old_sigchld, add);
+
+       uloop_ignore_signal(SIGPIPE, add);
 }
 
 static int uloop_get_next_timeout(struct timeval *tv)