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| author | Mike Frysinger | 2005-04-16 08:21:34 +0000 |
|---|---|---|
| committer | Mike Frysinger | 2005-04-16 08:21:34 +0000 |
| commit | a77b4f39708306d44058d7ca1683f448f51c5fce (patch) | |
| tree | 79f812d48d525d48a9aec555f7544dbe5653306f /init | |
| parent | 63e5e7bf0e903b8f1e1f3208d2bcd63868866207 (diff) | |
| download | busybox-a77b4f39708306d44058d7ca1683f448f51c5fce.zip busybox-a77b4f39708306d44058d7ca1683f448f51c5fce.tar.gz | |
jfb2 writes in Bug 119:
The init applet will restart (re-exec) itsself when it
receives a SIGHUP. However, just before it enters its
main loop, it resets SIGHUP to either re-load the inittab
(or ignore it if no inittab is used). Thus preventing
the re-exec option from being triggerable.
This patch adds a signal handler for SIGQUIT for init that
always causes init to re-exec itsself (along with killing
anything else that might be still running).
Diffstat (limited to 'init')
| -rw-r--r-- | init/init.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/init/init.c b/init/init.c index 0c8dc89..8508511 100644 --- a/init/init.c +++ b/init/init.c @@ -453,6 +453,7 @@ static pid_t run(const struct init_action *a) signal(SIGINT, SIG_DFL); signal(SIGTERM, SIG_DFL); signal(SIGHUP, SIG_DFL); + signal(SIGQUIT, SIG_DFL); signal(SIGCONT, SIG_DFL); signal(SIGSTOP, SIG_DFL); signal(SIGTSTP, SIG_DFL); @@ -693,6 +694,7 @@ static void shutdown_system(void) /* first disable all our signals */ sigemptyset(&block_signals); sigaddset(&block_signals, SIGHUP); + sigaddset(&block_signals, SIGQUIT); sigaddset(&block_signals, SIGCHLD); sigaddset(&block_signals, SIGUSR1); sigaddset(&block_signals, SIGUSR2); @@ -737,6 +739,7 @@ static void exec_signal(int sig) /* unblock all signals, blocked in shutdown_system() */ sigemptyset(&unblock_signals); sigaddset(&unblock_signals, SIGHUP); + sigaddset(&unblock_signals, SIGQUIT); sigaddset(&unblock_signals, SIGCHLD); sigaddset(&unblock_signals, SIGUSR1); sigaddset(&unblock_signals, SIGUSR2); @@ -1097,6 +1100,7 @@ extern int init_main(int argc, char **argv) /* Set up sig handlers -- be sure to * clear all of these in run() */ signal(SIGHUP, exec_signal); + signal(SIGQUIT, exec_signal); signal(SIGUSR1, halt_signal); signal(SIGUSR2, halt_signal); signal(SIGINT, ctrlaltdel_signal); |