init: fix a bug where on reload order of entries might be wrong
function old new delta run_shutdown_and_kill_processes - 97 +97 pause_and_low_level_reboot - 48 +48 run_actions 81 107 +26 restart_handler 56 81 +25 new_init_action 137 150 +13 run 576 579 +3 open_stdio_to_tty 110 98 -12 check_delayed_sigs 195 170 -25 waitfor 354 318 -36 low_level_reboot 53 - -53 kill_all_processes 115 - -115 ------------------------------------------------------------------------------ (add/remove: 2/2 grow/shrink: 4/3 up/down: 212/-241) Total: -29 bytes
This commit is contained in:
Denis Vlasenko
parent
e35af56790
commit
4ae8a05b13
172
init/init.c
172
init/init.c
@ -95,18 +95,15 @@ enum {
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#endif
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};
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static void halt_reboot_pwoff(int sig) NORETURN;
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/* Print a message to the specified device.
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* "where" may be bitwise-or'd from L_LOG | L_CONSOLE
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* NB: careful, we can be called after vfork!
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*/
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#define messageD(...) do { if (DEBUG_INIT) message(__VA_ARGS__); } while (0)
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#define dbg_message(...) do { if (DEBUG_INIT) message(__VA_ARGS__); } while (0)
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static void message(int where, const char *fmt, ...)
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__attribute__ ((format(printf, 2, 3)));
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static void message(int where, const char *fmt, ...)
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{
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static int log_fd = -1;
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va_list arguments;
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unsigned l;
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char msg[128];
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@ -116,20 +113,23 @@ static void message(int where, const char *fmt, ...)
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l = 1 + vsnprintf(msg + 1, sizeof(msg) - 2, fmt, arguments);
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if (l > sizeof(msg) - 1)
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l = sizeof(msg) - 1;
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msg[l] = '\0';
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va_end(arguments);
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if (ENABLE_FEATURE_INIT_SYSLOG) {
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if (where & L_LOG) {
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/* Log the message to syslogd */
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openlog("init", 0, LOG_DAEMON);
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/* don't print "\r" */
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syslog(LOG_INFO, "%s", msg + 1);
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closelog();
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}
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msg[l++] = '\n';
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msg[l] = '\0';
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} else {
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#if ENABLE_FEATURE_INIT_SYSLOG
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msg[l] = '\0';
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if (where & L_LOG) {
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/* Log the message to syslogd */
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openlog("init", 0, LOG_DAEMON);
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/* don't print "\r" */
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syslog(LOG_INFO, "%s", msg + 1);
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closelog();
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}
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msg[l++] = '\n';
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msg[l] = '\0';
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#else
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{
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static int log_fd = -1;
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msg[l++] = '\n';
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msg[l] = '\0';
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/* Take full control of the log tty, and never close it.
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@ -153,6 +153,7 @@ static void message(int where, const char *fmt, ...)
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return; /* don't print dup messages */
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}
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}
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#endif
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if (where & L_CONSOLE) {
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/* Send console messages to console so people will see them. */
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@ -199,7 +200,7 @@ static void console_init(void)
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dup2(fd, STDOUT_FILENO);
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xmove_fd(fd, STDERR_FILENO);
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}
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messageD(L_LOG, "console='%s'", s);
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dbg_message(L_LOG, "console='%s'", s);
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} else {
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/* Make sure fd 0,1,2 are not closed
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* (so that they won't be used by future opens) */
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@ -261,7 +262,7 @@ static void set_sane_term(void)
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/* Open the new terminal device.
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* NB: careful, we can be called after vfork! */
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static void open_stdio_to_tty(const char* tty_name, int exit_on_failure)
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static int open_stdio_to_tty(const char* tty_name)
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{
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/* empty tty_name means "use init's tty", else... */
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if (tty_name[0]) {
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@ -273,19 +274,13 @@ static void open_stdio_to_tty(const char* tty_name, int exit_on_failure)
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if (fd) {
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message(L_LOG | L_CONSOLE, "can't open %s: %s",
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tty_name, strerror(errno));
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if (exit_on_failure)
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_exit(EXIT_FAILURE);
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if (DEBUG_INIT)
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_exit(2);
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/* NB: we don't reach this if we were called after vfork.
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* Thus halt_reboot_pwoff() itself needs not be vfork-safe.
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*/
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halt_reboot_pwoff(SIGUSR1); /* halt the system */
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return 0; /* failure */
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}
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dup2(STDIN_FILENO, STDOUT_FILENO);
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dup2(STDIN_FILENO, STDERR_FILENO);
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}
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set_sane_term();
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return 1; /* success */
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}
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/* Wrapper around exec:
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@ -369,7 +364,8 @@ static pid_t run(const struct init_action *a)
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setsid();
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/* Open the new terminal device */
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open_stdio_to_tty(a->terminal, 1 /* - exit if open fails */);
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if (!open_stdio_to_tty(a->terminal))
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_exit(EXIT_FAILURE);
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/* NB: on NOMMU we can't wait for input in child, so
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* "askfirst" will work the same as "respawn". */
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@ -388,7 +384,7 @@ static pid_t run(const struct init_action *a)
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* be allowed to start a shell or whatever an init script
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* specifies.
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*/
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messageD(L_LOG, "waiting for enter to start '%s'"
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dbg_message(L_LOG, "waiting for enter to start '%s'"
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"(pid %d, tty '%s')\n",
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a->command, getpid(), a->terminal);
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full_write(STDOUT_FILENO, press_enter, sizeof(press_enter) - 1);
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@ -422,21 +418,6 @@ static pid_t run(const struct init_action *a)
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_exit(-1);
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}
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static void delete_init_action(struct init_action *action)
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{
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struct init_action *a, **nextp;
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nextp = &init_action_list;
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while ((a = *nextp) != NULL) {
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if (a == action) {
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*nextp = a->next;
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free(a);
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break;
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}
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nextp = &a->next;
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}
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}
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static struct init_action *mark_terminated(int pid)
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{
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struct init_action *a;
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@ -497,36 +478,44 @@ static void new_init_action(uint8_t action_type, const char *command, const char
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{
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struct init_action *a, **nextp;
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//BUG
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//old:
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//::shutdown:umount -a -r
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//::shutdown:swapoff -a
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//new: swapped:
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//::shutdown:swapoff -a
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//::shutdown:umount -a -r
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//on SIGHUP, new one will be loaded, but order will be wrong.
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/* Scenario:
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* old inittab:
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* ::shutdown:umount -a -r
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* ::shutdown:swapoff -a
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* new inittab:
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* ::shutdown:swapoff -a
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* ::shutdown:umount -a -r
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* On reload, we must ensure entries end up in correct order.
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* To achieve that, if we find a matching entry, we move it
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* to the end.
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*/
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nextp = &init_action_list;
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while ((a = *nextp) != NULL) {
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/* Don't enter action if it's already in the list,
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* just overwrite existing one's type.
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* This prevents losing running RESPAWNs.
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*/
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if ((strcmp(a->command, command) == 0)
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&& (strcmp(a->terminal, cons) == 0)
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) {
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a->action_type = action_type;
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return;
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/* Remove from list */
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*nextp = a->next;
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/* Find the end of the list */
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while (*nextp != NULL)
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nextp = &(*nextp)->next;
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a->next = NULL;
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break;
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}
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nextp = &a->next;
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}
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if (!a)
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a = xzalloc(sizeof(*a));
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/* Append to the end of the list */
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a = xzalloc(sizeof(*a));
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*nextp = a;
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a->action_type = action_type;
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safe_strncpy(a->command, command, sizeof(a->command));
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safe_strncpy(a->terminal, cons, sizeof(a->terminal));
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messageD(L_LOG | L_CONSOLE, "command='%s' action=%d tty='%s'\n",
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dbg_message(L_LOG | L_CONSOLE, "command='%s' action=%d tty='%s'\n",
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a->command, a->action_type, a->terminal);
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}
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@ -603,8 +592,8 @@ static void parse_inittab(void)
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#endif
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}
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static void low_level_reboot(unsigned magic) NORETURN;
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static void low_level_reboot(unsigned magic)
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static void pause_and_low_level_reboot(unsigned magic) NORETURN;
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static void pause_and_low_level_reboot(unsigned magic)
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{
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pid_t pid;
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@ -619,12 +608,11 @@ static void low_level_reboot(unsigned magic)
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reboot(magic);
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_exit(EXIT_SUCCESS);
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}
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waitfor(pid);
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while (1)
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sleep(1);
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}
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static void kill_all_processes(void)
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static void run_shutdown_and_kill_processes(void)
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{
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/* Run everything to be run at "shutdown". This is done _prior_
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* to killing everything, in case people wish to use scripts to
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@ -633,19 +621,16 @@ 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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/* Allow Ctrl-Alt-Del to reboot system. */
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reboot(RB_ENABLE_CAD); /* misnomer */
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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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kill(-1, SIGTERM);
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message(L_CONSOLE | L_LOG, "Sent SIG%s to all processes", "TERM");
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sync();
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sleep(1);
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message(L_CONSOLE, "Sending SIG%s to all processes", "KILL");
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kill(-1, SIGKILL);
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message(L_CONSOLE, "Sent SIG%s to all processes", "KILL");
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sync();
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sleep(1);
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/*sleep(1); - callers take care about making a pause */
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}
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/* Signal handling by init:
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@ -684,12 +669,13 @@ static void kill_all_processes(void)
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* and only one will be remebered and acted upon.
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*/
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static void halt_reboot_pwoff(int sig) NORETURN;
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static void halt_reboot_pwoff(int sig)
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{
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const char *m;
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unsigned rb;
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kill_all_processes();
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run_shutdown_and_kill_processes();
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m = "halt";
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rb = RB_HALT_SYSTEM;
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@ -701,7 +687,7 @@ static void halt_reboot_pwoff(int sig)
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rb = RB_POWER_OFF;
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}
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message(L_CONSOLE, "Requesting system %s", m);
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low_level_reboot(rb);
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pause_and_low_level_reboot(rb);
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/* not reached */
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}
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@ -752,11 +738,21 @@ static void restart_handler(int sig UNUSED_PARAM)
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* Thus don't need to worry about preserving errno
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* and such.
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*/
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kill_all_processes();
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open_stdio_to_tty(a->terminal, 0 /* - halt if open fails */);
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messageD(L_CONSOLE, "Trying to re-exec %s", a->command);
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init_exec(a->command);
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low_level_reboot(RB_HALT_SYSTEM);
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run_shutdown_and_kill_processes();
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/* Allow Ctrl-Alt-Del to reboot the system.
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* This is how kernel sets it up for init, we follow suit.
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*/
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reboot(RB_ENABLE_CAD); /* misnomer */
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if (open_stdio_to_tty(a->terminal)) {
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dbg_message(L_CONSOLE, "Trying to re-exec %s", a->command);
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while (wait(NULL) > 0)
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continue;
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init_exec(a->command);
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}
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/* Open or exec failed */
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pause_and_low_level_reboot(RB_HALT_SYSTEM);
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/* not reached */
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}
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}
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@ -764,40 +760,50 @@ static void restart_handler(int sig UNUSED_PARAM)
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#if ENABLE_FEATURE_USE_INITTAB
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static void reload_inittab(void)
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{
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struct init_action *a, *tmp;
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struct init_action *a, **nextp;
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message(L_LOG, "reloading /etc/inittab");
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/* Disable old entries */
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for (a = init_action_list; a; a = a->next) {
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for (a = init_action_list; a; a = a->next)
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a->action_type = ONCE;
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}
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/* Append new entries, or modify existing entries
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* (set a->action_type) if cmd and device name
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* match new ones. End result: only entries with
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* a->action_type == ONCE are stale.
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*/
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parse_inittab();
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if (ENABLE_FEATURE_KILL_REMOVED) {
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/* Kill stale entries */
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/* Be nice and send SIGTERM first */
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for (a = init_action_list; a; a = a->next)
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if (a->pid != 0)
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if (a->action_type == ONCE && a->pid != 0)
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kill(a->pid, SIGTERM);
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if (CONFIG_FEATURE_KILL_DELAY) {
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/* NB: parent will wait in NOMMU case */
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if ((BB_MMU ? fork() : vfork()) == 0) { /* child */
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sleep(CONFIG_FEATURE_KILL_DELAY);
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for (a = init_action_list; a; a = a->next)
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if (a->pid != 0)
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if (a->action_type == ONCE && a->pid != 0)
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kill(a->pid, SIGKILL);
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_exit(EXIT_SUCCESS);
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}
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}
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}
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/* Remove old and unused entries */
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for (a = init_action_list; a; a = tmp) {
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tmp = a->next;
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if (a->action_type & (ONCE | SYSINIT | WAIT))
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delete_init_action(a);
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/* Remove stale (ONCE) and not useful (SYSINIT,WAIT) entries */
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nextp = &init_action_list;
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while ((a = *nextp) != NULL) {
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if (a->action_type & (ONCE | SYSINIT | WAIT)) {
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*nextp = a->next;
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free(a);
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} else {
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nextp = &a->next;
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}
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}
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/* Not needed: */
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/* run_actions(RESPAWN | ASKFIRST); */
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/* - we return to main loop, which does this automagically */
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