path: root/t/
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authorJeff King <>2009-01-22 06:02:35 (GMT)
committerJunio C Hamano <>2009-01-22 06:46:52 (GMT)
commit4a16d072723b48699ea162da24eff05eba298834 (patch)
tree04d834214e8448f254118278ec057c77e3f8f1f1 /t/
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 't/')
1 files changed, 22 insertions, 0 deletions
diff --git a/t/ b/t/
new file mode 100755
index 0000000..9707af7
--- /dev/null
+++ b/t/
@@ -0,0 +1,22 @@
+test_description='signals work as we expect'
+. ./
+cat >expect <<EOF
+test_expect_success 'sigchain works' '
+ test-sigchain >actual
+ case "$?" in
+ 130) true ;; # POSIX w/ SIGINT=2
+ 3) true ;; # Windows
+ *) false ;;
+ esac &&
+ test_cmp expect actual