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init: preparatory patch, no code changes
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6c62246a35
commit
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@ -353,8 +353,8 @@ enum {
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void bb_signals(int sigs, void (*f)(int)) FAST_FUNC;
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void bb_signals(int sigs, void (*f)(int)) FAST_FUNC;
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/* Unlike signal() and bb_signals, sets handler with sigaction()
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/* Unlike signal() and bb_signals, sets handler with sigaction()
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* and in a way that while signal handler is run, no other signals
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* and in a way that while signal handler is run, no other signals
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* will be blocked: */
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* will be blocked; syscalls will not be restarted: */
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void bb_signals_recursive(int sigs, void (*f)(int)) FAST_FUNC;
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void bb_signals_recursive_norestart(int sigs, void (*f)(int)) FAST_FUNC;
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/* syscalls like read() will be interrupted with EINTR: */
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/* syscalls like read() will be interrupted with EINTR: */
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void signal_no_SA_RESTART_empty_mask(int sig, void (*handler)(int)) FAST_FUNC;
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void signal_no_SA_RESTART_empty_mask(int sig, void (*handler)(int)) FAST_FUNC;
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/* syscalls like read() won't be interrupted (though select/poll will be): */
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/* syscalls like read() won't be interrupted (though select/poll will be): */
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44
init/init.c
44
init/init.c
@ -65,18 +65,6 @@ enum {
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static void halt_reboot_pwoff(int sig) NORETURN;
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static void halt_reboot_pwoff(int sig) NORETURN;
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static void waitfor(pid_t pid)
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{
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/* waitfor(run(x)): protect against failed fork inside run() */
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if (pid <= 0)
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return;
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/* Wait for any child (prevent zombies from exiting orphaned processes)
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* but exit the loop only when specified one has exited. */
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while (wait(NULL) != pid)
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continue;
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}
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static void loop_forever(void) NORETURN;
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static void loop_forever(void) NORETURN;
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static void loop_forever(void)
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static void loop_forever(void)
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{
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{
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@ -476,6 +464,18 @@ static void delete_init_action(struct init_action *action)
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}
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}
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}
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}
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static void waitfor(pid_t pid)
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{
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/* waitfor(run(x)): protect against failed fork inside run() */
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if (pid <= 0)
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return;
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/* Wait for any child (prevent zombies from exiting orphaned processes)
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* but exit the loop only when specified one has exited. */
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while (wait(NULL) != pid)
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continue;
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}
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/* Run all commands of a particular type */
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/* Run all commands of a particular type */
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static void run_actions(int action_type)
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static void run_actions(int action_type)
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{
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{
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@ -507,7 +507,7 @@ static void run_actions(int action_type)
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}
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}
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}
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}
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static void init_reboot(unsigned long magic)
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static void low_level_reboot(unsigned long magic)
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{
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{
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pid_t pid;
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pid_t pid;
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/* We have to fork here, since the kernel calls do_exit(EXIT_SUCCESS) in
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/* We have to fork here, since the kernel calls do_exit(EXIT_SUCCESS) in
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@ -534,7 +534,7 @@ static void kill_all_processes(void)
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message(L_CONSOLE | L_LOG, "The system is going down NOW!");
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message(L_CONSOLE | L_LOG, "The system is going down NOW!");
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/* Allow Ctrl-Alt-Del to reboot system. */
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/* Allow Ctrl-Alt-Del to reboot system. */
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init_reboot(RB_ENABLE_CAD);
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low_level_reboot(RB_ENABLE_CAD);
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/* Send signals to every process _except_ pid 1 */
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/* Send signals to every process _except_ pid 1 */
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message(L_CONSOLE | L_LOG, "Sending SIG%s to all processes", "TERM");
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message(L_CONSOLE | L_LOG, "Sending SIG%s to all processes", "TERM");
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@ -566,13 +566,13 @@ static void halt_reboot_pwoff(int sig)
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message(L_CONSOLE | L_LOG, "Requesting system %s", m);
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message(L_CONSOLE | L_LOG, "Requesting system %s", m);
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/* allow time for last message to reach serial console */
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/* allow time for last message to reach serial console */
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sleep(2);
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sleep(2);
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init_reboot(rb);
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low_level_reboot(rb);
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loop_forever();
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loop_forever();
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}
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}
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/* Handler for QUIT - exec "restart" action,
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/* Handler for QUIT - exec "restart" action,
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* else (no such action defined) do nothing */
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* else (no such action defined) do nothing */
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static void exec_restart_action(int sig UNUSED_PARAM)
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static void restart_handler(int sig UNUSED_PARAM)
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{
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{
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struct init_action *a;
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struct init_action *a;
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@ -589,7 +589,7 @@ static void exec_restart_action(int sig UNUSED_PARAM)
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messageD(L_CONSOLE | L_LOG, "Trying to re-exec %s", a->command);
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messageD(L_CONSOLE | L_LOG, "Trying to re-exec %s", a->command);
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init_exec(a->command);
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init_exec(a->command);
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sleep(2);
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sleep(2);
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init_reboot(RB_HALT_SYSTEM);
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low_level_reboot(RB_HALT_SYSTEM);
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loop_forever();
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loop_forever();
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}
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}
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}
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}
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@ -723,7 +723,7 @@ static void parse_inittab(void)
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}
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}
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#if ENABLE_FEATURE_USE_INITTAB
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#if ENABLE_FEATURE_USE_INITTAB
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static void reload_signal(int sig UNUSED_PARAM)
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static void reload_inittab(int sig UNUSED_PARAM)
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{
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{
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struct init_action *a, *tmp;
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struct init_action *a, *tmp;
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@ -769,7 +769,7 @@ static void reload_signal(int sig UNUSED_PARAM)
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run_actions(RESPAWN | ASKFIRST);
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run_actions(RESPAWN | ASKFIRST);
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}
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}
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#else
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#else
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void reload_signal(int sig);
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void reload_inittab(int sig);
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#endif
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#endif
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int init_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int init_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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@ -797,7 +797,7 @@ int init_main(int argc UNUSED_PARAM, char **argv)
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// Move signal handling from handlers to main loop -
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// Move signal handling from handlers to main loop -
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// we have bad races otherwise.
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// we have bad races otherwise.
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// E.g. parse_inittab() vs. delete_init_action()...
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// E.g. parse_inittab() vs. delete_init_action()...
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signal(SIGQUIT, exec_restart_action);
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signal(SIGQUIT, restart_handler);
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bb_signals(0
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bb_signals(0
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+ (1 << SIGUSR1) /* halt */
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+ (1 << SIGUSR1) /* halt */
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+ (1 << SIGUSR2) /* poweroff */
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+ (1 << SIGUSR2) /* poweroff */
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@ -812,7 +812,7 @@ int init_main(int argc UNUSED_PARAM, char **argv)
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/* Turn off rebooting via CTL-ALT-DEL -- we get a
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/* Turn off rebooting via CTL-ALT-DEL -- we get a
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* SIGINT on CAD so we can shut things down gracefully... */
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* SIGINT on CAD so we can shut things down gracefully... */
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init_reboot(RB_DISABLE_CAD);
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low_level_reboot(RB_DISABLE_CAD);
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}
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}
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/* Figure out where the default console should be */
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/* Figure out where the default console should be */
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@ -900,7 +900,7 @@ int init_main(int argc UNUSED_PARAM, char **argv)
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run_actions(ONCE);
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run_actions(ONCE);
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/* Redefine SIGHUP to reread /etc/inittab */
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/* Redefine SIGHUP to reread /etc/inittab */
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signal(SIGHUP, ENABLE_FEATURE_USE_INITTAB ? reload_signal : SIG_IGN);
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signal(SIGHUP, ENABLE_FEATURE_USE_INITTAB ? reload_inittab : SIG_IGN);
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/* Now run the looping stuff for the rest of forever */
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/* Now run the looping stuff for the rest of forever */
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while (1) {
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while (1) {
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@ -47,7 +47,7 @@ void FAST_FUNC bb_signals(int sigs, void (*f)(int))
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}
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}
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}
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}
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void FAST_FUNC bb_signals_recursive(int sigs, void (*f)(int))
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void FAST_FUNC bb_signals_recursive_norestart(int sigs, void (*f)(int))
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{
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{
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int sig_no = 0;
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int sig_no = 0;
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int bit = 1;
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int bit = 1;
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@ -455,9 +455,9 @@ int runsv_main(int argc UNUSED_PARAM, char **argv)
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ndelay_on(selfpipe.wr);
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ndelay_on(selfpipe.wr);
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sig_block(SIGCHLD);
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sig_block(SIGCHLD);
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bb_signals_recursive(1 << SIGCHLD, s_child);
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bb_signals_recursive_norestart(1 << SIGCHLD, s_child);
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sig_block(SIGTERM);
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sig_block(SIGTERM);
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bb_signals_recursive(1 << SIGTERM, s_term);
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bb_signals_recursive_norestart(1 << SIGTERM, s_term);
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xchdir(dir);
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xchdir(dir);
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/* bss: svd[0].pid = 0; */
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/* bss: svd[0].pid = 0; */
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@ -912,10 +912,10 @@ int svlogd_main(int argc, char **argv)
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sigaddset(&blocked_sigset, SIGALRM);
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sigaddset(&blocked_sigset, SIGALRM);
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sigaddset(&blocked_sigset, SIGHUP);
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sigaddset(&blocked_sigset, SIGHUP);
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sigprocmask(SIG_BLOCK, &blocked_sigset, NULL);
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sigprocmask(SIG_BLOCK, &blocked_sigset, NULL);
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bb_signals_recursive(1 << SIGTERM, sig_term_handler);
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bb_signals_recursive_norestart(1 << SIGTERM, sig_term_handler);
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bb_signals_recursive(1 << SIGCHLD, sig_child_handler);
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bb_signals_recursive_norestart(1 << SIGCHLD, sig_child_handler);
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bb_signals_recursive(1 << SIGALRM, sig_alarm_handler);
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bb_signals_recursive_norestart(1 << SIGALRM, sig_alarm_handler);
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bb_signals_recursive(1 << SIGHUP, sig_hangup_handler);
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bb_signals_recursive_norestart(1 << SIGHUP, sig_hangup_handler);
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logdirs_reopen();
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logdirs_reopen();
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