From: Ben Pfaff <blp@nicira.com>
Date: Tue, 23 Mar 2010 22:27:44 +0000 (-0700)
Subject: fatal-signal: Initialize library upon any call to public function.
X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c874f17fc743b38295f6059ab6554561b7555724;p=openvswitch

fatal-signal: Initialize library upon any call to public function.

Not calling fatal_signal_init() means that the signal handlers don't get
registered, so the process won't clean up on fatal signals.  Furthermore,
signal_fds[0] is then 0, which means that fatal-signal_wait() waits on
stdin, so if you are testing a program interactively and accidentally type
something on stdin then that program's CPU usage jumps to 100%.

Since poll_block() calls fatal_signal_wait() this seems like the most
reliable solution.
---

diff --git a/lib/fatal-signal.c b/lib/fatal-signal.c
index 80ecfc35..f6f913eb 100644
--- a/lib/fatal-signal.c
+++ b/lib/fatal-signal.c
@@ -137,8 +137,11 @@ fatal_signal_handler(int sig_nr)
 void
 fatal_signal_run(void)
 {
-    int sig_nr = stored_sig_nr;
+    int sig_nr;
 
+    fatal_signal_init();
+
+    sig_nr = stored_sig_nr;
     if (sig_nr != SIG_ATOMIC_MAX) {
         call_hooks(sig_nr);
 
@@ -152,6 +155,7 @@ fatal_signal_run(void)
 void
 fatal_signal_wait(void)
 {
+    fatal_signal_init();
     poll_fd_wait(signal_fds[0], POLLIN);
 }