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4a16d07272
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>
23 lines
305 B
Bash
Executable file
23 lines
305 B
Bash
Executable file
#!/bin/sh
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test_description='signals work as we expect'
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. ./test-lib.sh
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cat >expect <<EOF
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three
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two
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one
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EOF
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test_expect_success 'sigchain works' '
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test-sigchain >actual
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case "$?" in
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130) true ;; # POSIX w/ SIGINT=2
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3) true ;; # Windows
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*) false ;;
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esac &&
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test_cmp expect actual
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'
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test_done
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