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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
340 B
C
23 lines
340 B
C
#include "sigchain.h"
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#include "cache.h"
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#define X(f) \
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static void f(int sig) { \
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puts(#f); \
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fflush(stdout); \
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sigchain_pop(sig); \
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raise(sig); \
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}
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X(one)
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X(two)
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X(three)
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#undef X
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int main(int argc, char **argv) {
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sigchain_push(SIGINT, one);
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sigchain_push(SIGINT, two);
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sigchain_push(SIGINT, three);
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raise(SIGINT);
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return 0;
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}
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