use SA_RESTART for SIGINT

SA_RESTART specifically doesn't affect polling syscalls (the thing we
want to interrupt), but it prevents stupid things like having to check
for EINTR on recv/send (which we weren't doing anyway)

diff --git a/src/main.c b/src/main.c
index 16d96a8..739a6f0 100644 (file)
--- a/src/main.c
+++ b/src/main.c
@@ -18,7 +18,8 @@ static void set_handler()
        struct sigaction sa;
        sa.sa_handler = on_sigint;
        sigemptyset(&sa.sa_mask);
-       sa.sa_flags = SA_RESETHAND; // only run it once
+       /* Note that SA_RESTART doesn't affect select/poll/epoll_wait. */
+       sa.sa_flags = SA_RESETHAND | SA_RESTART;
        if (sigaction(SIGINT, &sa, NULL) == -1)
                perror("sigaction");
        sa.sa_handler = SIG_IGN;