unix/unix_mphal: Properly initialize struct sigaction.

Paul Sokolovsky · Paul Sokolovsky · commit 3db2b230602b · 2015-12-17T23:24:35.000+02:00
This solves long-standing non-deterministic bug, which manifested itself
on x86 32-bit (at least of reported cases) - segfault on Ctrl+C (i.e.
SIGINT).
diff --git a/unix/unix_mphal.c b/unix/unix_mphal.c
@@ -53,6 +53,7 @@ void mp_hal_set_interrupt_char(char c) {
         #ifndef _WIN32
         // enable signal handler
         struct sigaction sa;
+        memset(&sa, 0, sizeof(sa));
         sa.sa_handler = sighandler;
         sigemptyset(&sa.sa_mask);
         sigaction(SIGINT, &sa, NULL);
