diff options
author | Jeff King <peff@peff.net> | 2009-01-22 01:02:35 -0500 |
---|---|---|
committer | Junio C Hamano <gitster@pobox.com> | 2009-01-21 22:46:52 -0800 |
commit | 4a16d072723b48699ea162da24eff05eba298834 (patch) | |
tree | 04d834214e8448f254118278ec057c77e3f8f1f1 /sigchain.h | |
parent | 479b0ae81c9291a8bb8d7b2347cc58eeaa701304 (diff) | |
download | git-4a16d072723b48699ea162da24eff05eba298834.tar.gz |
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 <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'sigchain.h')
-rw-r--r-- | sigchain.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/sigchain.h b/sigchain.h new file mode 100644 index 0000000000..254ebb0fa6 --- /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 */ |