Messages in this thread | | | Date | Sun, 2 Dec 2007 20:18:05 +0300 | From | Oleg Nesterov <> | Subject | Re: [PATCH 0/2] fix the long standing exec vs kill race |
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On 12/02, Simon Holm Th?gersen wrote: > > s??n, 02 12 2007 kl. 18:14 +0300, skrev Oleg Nesterov: > > > > Please comment, I think at least the idea is promising. > > > I have an issue that sounds related, but I might be completely off. I > would expect the simple attached program to keep receiving the same > signal, i.e. respond to > killall signal-exec -s SIGHUP > > I tried your patches, but they didn't help. > > Any ideas? > > > Simon Holm Th??gersen
> #include <signal.h> > #include <stdio.h> > #include <unistd.h> > > static char **argv_; > > static void handler(int signal) > { > printf("got signal %d\n", signal); > execv(argv_[0], argv_); > } > > int main(int argc, char *argv[]) > { > printf("spawned\n"); > argv_ = argv; > if (signal(SIGTERM, handler) == SIG_ERR) > err(1, "could not set signal handler for SIGTERM"); > if (signal(SIGHUP, handler) == SIG_ERR) > err(1, "could not set signal handler for SIGTERM"); > sleep(60); > return 0; > } >
I think this is another issue which should be solved (?).
exec() from the signal handler doesn't do sys_sigreturn(), so we don't unblock the signal, and it remains blocked after exec().
Hmm. Is this linux bug, or application bug?
Oleg.
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