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authorJeff King <peff@peff.net>2009-01-22 01:02:35 -0500
committerJunio C Hamano <gitster@pobox.com>2009-01-21 22:46:52 -0800
commit4a16d072723b48699ea162da24eff05eba298834 (patch)
tree04d834214e8448f254118278ec057c77e3f8f1f1 /Makefile
parent479b0ae81c9291a8bb8d7b2347cc58eeaa701304 (diff)
downloadgit-4a16d072723b48699ea162da24eff05eba298834.tar.gz
git-4a16d072723b48699ea162da24eff05eba298834.tar.xz
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 'Makefile')
-rw-r--r--Makefile3
1 files changed, 3 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index 2b873fa99..fd02decc0 100644
--- a/Makefile
+++ b/Makefile
@@ -388,6 +388,7 @@ LIB_H += revision.h
LIB_H += run-command.h
LIB_H += sha1-lookup.h
LIB_H += sideband.h
+LIB_H += sigchain.h
LIB_H += strbuf.h
LIB_H += tag.h
LIB_H += transport.h
@@ -481,6 +482,7 @@ LIB_OBJS += sha1-lookup.o
LIB_OBJS += sha1_name.o
LIB_OBJS += shallow.o
LIB_OBJS += sideband.o
+LIB_OBJS += sigchain.o
LIB_OBJS += strbuf.o
LIB_OBJS += symlinks.o
LIB_OBJS += tag.o
@@ -1364,6 +1366,7 @@ TEST_PROGRAMS += test-match-trees$X
TEST_PROGRAMS += test-parse-options$X
TEST_PROGRAMS += test-path-utils$X
TEST_PROGRAMS += test-sha1$X
+TEST_PROGRAMS += test-sigchain$X
all:: $(TEST_PROGRAMS)