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init: preparatory patch, no code changes

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This commit is contained in:
Denis Vlasenko 2009-01-31 01:02:07 +00:00
parent 6c62246a35
commit cab28aa7de
5 changed files with 31 additions and 31 deletions
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4
include/libbb.h
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@ -353,8 +353,8 @@ enum {
void bb_signals(int sigs, void (*f)(int)) FAST_FUNC;
/* Unlike signal() and bb_signals, sets handler with sigaction()
* and in a way that while signal handler is run, no other signals
* will be blocked: */
void bb_signals_recursive(int sigs, void (*f)(int)) FAST_FUNC;
* will be blocked; syscalls will not be restarted: */
void bb_signals_recursive_norestart(int sigs, void (*f)(int)) FAST_FUNC;
/* syscalls like read() will be interrupted with EINTR: */
void signal_no_SA_RESTART_empty_mask(int sig, void (*handler)(int)) FAST_FUNC;
/* syscalls like read() won't be interrupted (though select/poll will be): */

44
init/init.c
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@ -65,18 +65,6 @@ enum {
static void halt_reboot_pwoff(int sig) NORETURN;
static void waitfor(pid_t pid)
{
/* waitfor(run(x)): protect against failed fork inside run() */
if (pid <= 0)
return;
/* Wait for any child (prevent zombies from exiting orphaned processes)
* but exit the loop only when specified one has exited. */
while (wait(NULL) != pid)
continue;
}
static void loop_forever(void) NORETURN;
static void loop_forever(void)
{
@ -476,6 +464,18 @@ static void delete_init_action(struct init_action *action)
}
}
static void waitfor(pid_t pid)
{
/* waitfor(run(x)): protect against failed fork inside run() */
if (pid <= 0)
return;
/* Wait for any child (prevent zombies from exiting orphaned processes)
* but exit the loop only when specified one has exited. */
while (wait(NULL) != pid)
continue;
}
/* Run all commands of a particular type */
static void run_actions(int action_type)
{
@ -507,7 +507,7 @@ static void run_actions(int action_type)
}
}
static void init_reboot(unsigned long magic)
static void low_level_reboot(unsigned long magic)
{
pid_t pid;
/* We have to fork here, since the kernel calls do_exit(EXIT_SUCCESS) in
@ -534,7 +534,7 @@ static void kill_all_processes(void)
message(L_CONSOLE | L_LOG, "The system is going down NOW!");
/* Allow Ctrl-Alt-Del to reboot system. */
init_reboot(RB_ENABLE_CAD);
low_level_reboot(RB_ENABLE_CAD);
/* Send signals to every process _except_ pid 1 */
message(L_CONSOLE | L_LOG, "Sending SIG%s to all processes", "TERM");
@ -566,13 +566,13 @@ static void halt_reboot_pwoff(int sig)
message(L_CONSOLE | L_LOG, "Requesting system %s", m);
/* allow time for last message to reach serial console */
sleep(2);
init_reboot(rb);
low_level_reboot(rb);
loop_forever();
}
/* Handler for QUIT - exec "restart" action,
* else (no such action defined) do nothing */
static void exec_restart_action(int sig UNUSED_PARAM)
static void restart_handler(int sig UNUSED_PARAM)
{
struct init_action *a;
@ -589,7 +589,7 @@ static void exec_restart_action(int sig UNUSED_PARAM)
messageD(L_CONSOLE | L_LOG, "Trying to re-exec %s", a->command);
init_exec(a->command);
sleep(2);
init_reboot(RB_HALT_SYSTEM);
low_level_reboot(RB_HALT_SYSTEM);
loop_forever();
}
}
@ -723,7 +723,7 @@ static void parse_inittab(void)
}
#if ENABLE_FEATURE_USE_INITTAB
static void reload_signal(int sig UNUSED_PARAM)
static void reload_inittab(int sig UNUSED_PARAM)
{
struct init_action *a, *tmp;
@ -769,7 +769,7 @@ static void reload_signal(int sig UNUSED_PARAM)
run_actions(RESPAWN | ASKFIRST);
}
#else
void reload_signal(int sig);
void reload_inittab(int sig);
#endif
int init_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
@ -797,7 +797,7 @@ int init_main(int argc UNUSED_PARAM, char **argv)
// Move signal handling from handlers to main loop -
// we have bad races otherwise.
// E.g. parse_inittab() vs. delete_init_action()...
signal(SIGQUIT, exec_restart_action);
signal(SIGQUIT, restart_handler);
bb_signals(0
+ (1 << SIGUSR1) /* halt */
+ (1 << SIGUSR2) /* poweroff */
@ -812,7 +812,7 @@ int init_main(int argc UNUSED_PARAM, char **argv)
/* Turn off rebooting via CTL-ALT-DEL -- we get a
* SIGINT on CAD so we can shut things down gracefully... */
init_reboot(RB_DISABLE_CAD);
low_level_reboot(RB_DISABLE_CAD);
}
/* Figure out where the default console should be */
@ -900,7 +900,7 @@ int init_main(int argc UNUSED_PARAM, char **argv)
run_actions(ONCE);
/* Redefine SIGHUP to reread /etc/inittab */
signal(SIGHUP, ENABLE_FEATURE_USE_INITTAB ? reload_signal : SIG_IGN);
signal(SIGHUP, ENABLE_FEATURE_USE_INITTAB ? reload_inittab : SIG_IGN);
/* Now run the looping stuff for the rest of forever */
while (1) {

2
libbb/signals.c
View File

@ -47,7 +47,7 @@ void FAST_FUNC bb_signals(int sigs, void (*f)(int))
}
}
void FAST_FUNC bb_signals_recursive(int sigs, void (*f)(int))
void FAST_FUNC bb_signals_recursive_norestart(int sigs, void (*f)(int))
{
int sig_no = 0;
int bit = 1;

4
runit/runsv.c
View File

@ -455,9 +455,9 @@ int runsv_main(int argc UNUSED_PARAM, char **argv)
ndelay_on(selfpipe.wr);
sig_block(SIGCHLD);
bb_signals_recursive(1 << SIGCHLD, s_child);
bb_signals_recursive_norestart(1 << SIGCHLD, s_child);
sig_block(SIGTERM);
bb_signals_recursive(1 << SIGTERM, s_term);
bb_signals_recursive_norestart(1 << SIGTERM, s_term);
xchdir(dir);
/* bss: svd[0].pid = 0; */

8
runit/svlogd.c
View File

@ -912,10 +912,10 @@ int svlogd_main(int argc, char **argv)
sigaddset(&blocked_sigset, SIGALRM);
sigaddset(&blocked_sigset, SIGHUP);
sigprocmask(SIG_BLOCK, &blocked_sigset, NULL);
bb_signals_recursive(1 << SIGTERM, sig_term_handler);
bb_signals_recursive(1 << SIGCHLD, sig_child_handler);
bb_signals_recursive(1 << SIGALRM, sig_alarm_handler);
bb_signals_recursive(1 << SIGHUP, sig_hangup_handler);
bb_signals_recursive_norestart(1 << SIGTERM, sig_term_handler);
bb_signals_recursive_norestart(1 << SIGCHLD, sig_child_handler);
bb_signals_recursive_norestart(1 << SIGALRM, sig_alarm_handler);
bb_signals_recursive_norestart(1 << SIGHUP, sig_hangup_handler);
logdirs_reopen();