git-commit-vandalism/t/t0005-signals.sh
Jeff King 4a16d07272 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>
2009-01-21 22:46:52 -08:00

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#!/bin/sh
test_description='signals work as we expect'
. ./test-lib.sh
cat >expect <<EOF
three
two
one
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
'
test_done