From 4a16d072723b48699ea162da24eff05eba298834 Mon Sep 17 00:00:00 2001 From: Jeff King Date: Thu, 22 Jan 2009 01:02:35 -0500 Subject: 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 --- .gitignore | 1 + 1 file changed, 1 insertion(+) (limited to '.gitignore') diff --git a/.gitignore b/.gitignore index d9adce585..f28a54d26 100644 --- a/.gitignore +++ b/.gitignore @@ -152,6 +152,7 @@ test-match-trees test-parse-options test-path-utils test-sha1 +test-sigchain common-cmds.h *.tar.gz *.dsc -- cgit v1.2.1