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| author | Eric Andersen <andersen@codepoet.org> | 2001-11-30 19:10:58 +0000 |
|---|---|---|
| committer | Eric Andersen <andersen@codepoet.org> | 2001-11-30 19:10:58 +0000 |
| commit | ed8a9be2871bce5bfef43bd2edc645a95098df75 (patch) | |
| tree | 8df3a4a9ced7a9ca47964ecacafce11eaa99d223 | |
| parent | c3657428d3207d35cda634adbe23f75457f7912b (diff) | |
| download | busybox-ed8a9be2871bce5bfef43bd2edc645a95098df75.tar.gz | |
Patch from Dan Langlois <dan@somanetworks.com> Support SIGSTOP/SIGCONT
for wierd situations when people want init to actualy stop doing
anything for a while...
| -rw-r--r-- | init/init.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/init/init.c b/init/init.c index 8e2368306..d0beb2a9a 100644 --- a/init/init.c +++ b/init/init.c @@ -181,6 +181,7 @@ static char *log = VC_5; static int kernelVersion = 0; static char termType[32] = "TERM=linux"; static char console[32] = _PATH_CONSOLE; +sig_atomic_t got_cont = 0; static void delete_initAction(initAction * action); @@ -473,6 +474,9 @@ static pid_t run(char *command, char *terminal, int get_enter) signal(SIGINT, SIG_DFL); signal(SIGTERM, SIG_DFL); signal(SIGHUP, SIG_DFL); + signal(SIGCONT, SIG_DFL); + signal(SIGSTOP, SIG_DFL); + signal(SIGTSTP, SIG_DFL); if ((fd = device_open(terminal, O_RDWR)) < 0) { if (stat(terminal, &sb) != 0) { @@ -652,6 +656,9 @@ static void shutdown_system(void) sigaddset(&block_signals, SIGUSR2); sigaddset(&block_signals, SIGINT); sigaddset(&block_signals, SIGTERM); + sigaddset(&block_signals, SIGCONT); + sigaddset(&block_signals, SIGSTOP); + sigaddset(&block_signals, SIGTSTP); sigprocmask(SIG_BLOCK, &block_signals, NULL); /* Allow Ctrl-Alt-Del to reboot system. */ @@ -726,6 +733,27 @@ static void ctrlaltdel_signal(int sig) run_actions(CTRLALTDEL); } +/* + * The SIGSTOP & SIGTSTP handler + */ +static void stop_handler(int sig) +{ + int saved_errno = errno; + + got_cont = 0; + while(!got_cont) pause(); + got_cont = 0; + errno = saved_errno; +} + +/* + * The SIGCONT handler + */ +static void cont_handler(int sig) +{ + got_cont = 1; +} + #endif /* ! DEBUG_INIT */ static void new_initAction(initActionEnum action, char *process, char *cons) @@ -925,6 +953,9 @@ extern int init_main(int argc, char **argv) signal(SIGUSR2, halt_signal); signal(SIGINT, ctrlaltdel_signal); signal(SIGTERM, reboot_signal); + signal(SIGCONT, cont_handler); + signal(SIGSTOP, stop_handler); + signal(SIGTSTP, stop_handler); /* Turn off rebooting via CTL-ALT-DEL -- we get a * SIGINT on CAD so we can shut things down gracefully... */ |