path: root/test-sigchain.c
AgeCommit message (Collapse)Author
2009-01-30t0005: use SIGTERM for sigchain testJeff King
The signal tests consists of checking that each of our handlers is executed, and that the test program was killed by the final signal. We arbitrarily used SIGINT as the kill signal. However, some platforms (notably Solaris) will default SIGINT to SIG_IGN if there is no controlling terminal. In that case, we don't end up killing the program with the final signal and the test fails. This is a problem since the test script should not depend on outside factors; let's use SIGTERM instead, which should behave consistently. Signed-off-by: Jeff King <> Signed-off-by: Junio C Hamano <>
2009-01-22chain kill signals for cleanup functionsJeff King
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 <>