path: root/sigchain.h
diff options
authorJeff King <>2009-01-22 06:02:35 (GMT)
committerJunio C Hamano <>2009-01-22 06:46:52 (GMT)
commit4a16d072723b48699ea162da24eff05eba298834 (patch)
tree04d834214e8448f254118278ec057c77e3f8f1f1 /sigchain.h
parent479b0ae81c9291a8bb8d7b2347cc58eeaa701304 (diff)
chain kill signals for cleanup functions
If a piece of code wanted to do some cleanup before exiting (e.g., cleaning up a lockfile or a tempfile), our usual strategy was to install a signal handler that did something like this: do_cleanup(); /* actual work */ signal(signo, SIG_DFL); /* restore previous behavior */ raise(signo); /* deliver signal, killing ourselves */ For a single handler, this works fine. However, if we want to clean up two _different_ things, we run into a problem. The most recently installed handler will run, but when it removes itself as a handler, it doesn't put back the first handler. This patch introduces sigchain, a tiny library for handling a stack of signal handlers. You sigchain_push each handler, and use sigchain_pop to restore whoever was before you in the stack. Signed-off-by: Jeff King <> Signed-off-by: Junio C Hamano <>
Diffstat (limited to 'sigchain.h')
1 files changed, 9 insertions, 0 deletions
diff --git a/sigchain.h b/sigchain.h
new file mode 100644
index 0000000..254ebb0
--- /dev/null
+++ b/sigchain.h
@@ -0,0 +1,9 @@
+#ifndef SIGCHAIN_H
+#define SIGCHAIN_H
+typedef void (*sigchain_fun)(int);
+int sigchain_push(int sig, sigchain_fun f);
+int sigchain_pop(int sig);
+#endif /* SIGCHAIN_H */