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Patch from Dan Langlois <dan@somanetworks.com> Support SIGSTOP/SIGCONT

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for wierd situations when people want init to actualy stop doing
anything for a while...
This commit is contained in:
Eric Andersen 2001-11-30 19:10:58 +00:00
parent c3657428d3
commit ed8a9be287
1 changed files with 31 additions and 0 deletions
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31
init/init.c
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@ -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... */