mirror of
https://git.busybox.net/busybox.git
synced 2024-12-03 02:23:27 +08:00
convert #if to if -- let gcc optimize away dead code for us
This commit is contained in:
Mike Frysinger
parent
ec5631b6d6
commit
bb50fdfe07
@ -37,10 +37,9 @@ config FEATURE_KILL_REMOVED
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been removed.
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config FEATURE_KILL_DELAY
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int "How long to wait between TERM and KILL (0 - send TERM only)"
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int "How long to wait between TERM and KILL (0 - send TERM only)" if FEATURE_KILL_REMOVED
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range 0 1024
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default 0
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depends on FEATURE_KILL_REMOVED
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help
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With nonzero setting, init sends TERM, forks, child waits N
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seconds, sends KILL and exits. Setting it too high is unwise
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239
init/init.c
239
init/init.c
@ -12,16 +12,12 @@
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#include "libbb.h"
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#include <paths.h>
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#include <sys/reboot.h>
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#if ENABLE_FEATURE_INIT_SYSLOG
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# include <sys/syslog.h>
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#endif
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#include <sys/syslog.h>
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#define INIT_BUFFS_SIZE 256
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#define CONSOLE_NAME_SIZE 32
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#define MAXENV 16 /* Number of env. vars */
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#if ENABLE_FEATURE_INIT_COREDUMPS
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/*
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* When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called
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* before processes are spawned to set core file size as unlimited.
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@ -30,7 +26,6 @@
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*/
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#define CORE_ENABLE_FLAG_FILE "/.init_enable_core"
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#include <sys/resource.h>
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#endif
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#define INITTAB "/etc/inittab" /* inittab file location */
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#ifndef INIT_SCRIPT
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@ -68,12 +63,8 @@ struct init_action {
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/* Static variables */
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static struct init_action *init_action_list = NULL;
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#if !ENABLE_FEATURE_INIT_SYSLOG
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static const char *log_console = VC_5;
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#endif
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#if !ENABLE_DEBUG_INIT
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static sig_atomic_t got_cont = 0;
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#endif
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enum {
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L_LOG = 0x1,
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@ -105,33 +96,22 @@ static const char *const environment[] = {
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/* Function prototypes */
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static void delete_init_action(struct init_action *a);
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static int waitfor(pid_t pid);
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#if !ENABLE_DEBUG_INIT
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static void shutdown_signal(int sig);
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#endif
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#if !ENABLE_DEBUG_INIT
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static void loop_forever(void)
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{
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while (1)
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sleep(1);
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}
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#endif
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/* Print a message to the specified device.
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* Device may be bitwise-or'd from L_LOG | L_CONSOLE */
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#if ENABLE_DEBUG_INIT
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#define messageD message
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#else
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#define messageD(...) do {} while (0)
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#endif
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#define messageD(...) do { if (ENABLE_DEBUG_INIT) message(__VA_ARGS__); } while (0)
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static void message(int device, const char *fmt, ...)
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__attribute__ ((format(printf, 2, 3)));
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static void message(int device, const char *fmt, ...)
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{
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#if !ENABLE_FEATURE_INIT_SYSLOG
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static int log_fd = -1;
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#endif
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va_list arguments;
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int l;
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char msg[128];
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@ -143,40 +123,40 @@ static void message(int device, const char *fmt, ...)
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msg[sizeof(msg) - 2] = '\0';
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l = strlen(msg);
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#if ENABLE_FEATURE_INIT_SYSLOG
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/* Log the message to syslogd */
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if (device & L_LOG) {
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/* don't out "\r" */
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openlog(applet_name, 0, LOG_DAEMON);
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syslog(LOG_INFO, "init: %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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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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* It's mine, all mine! Muhahahaha! */
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if (log_fd < 0) {
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if (!log_console) {
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log_fd = 2;
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} else {
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log_fd = device_open(log_console, O_WRONLY | O_NONBLOCK | O_NOCTTY);
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if (log_fd < 0) {
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bb_error_msg("can't log to %s", log_console);
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device = L_CONSOLE;
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if (ENABLE_FEATURE_INIT_SYSLOG) {
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/* Log the message to syslogd */
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if (device & L_LOG) {
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/* don't out "\r" */
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openlog(applet_name, 0, LOG_DAEMON);
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syslog(LOG_INFO, "init: %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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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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* It's mine, all mine! Muhahahaha! */
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if (log_fd < 0) {
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if (!log_console) {
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log_fd = 2;
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} else {
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close_on_exec_on(log_fd);
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log_fd = device_open(log_console, O_WRONLY | O_NONBLOCK | O_NOCTTY);
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if (log_fd < 0) {
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bb_error_msg("can't log to %s", log_console);
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device = L_CONSOLE;
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} else {
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close_on_exec_on(log_fd);
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}
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}
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}
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if (device & L_LOG) {
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full_write(log_fd, msg, l);
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if (log_fd == 2)
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return; /* don't print dup messages */
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}
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}
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if (device & L_LOG) {
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full_write(log_fd, msg, l);
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if (log_fd == 2)
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return; /* don't print dup messages */
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}
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#endif
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if (device & L_CONSOLE) {
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/* Send console messages to console so people will see them. */
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@ -235,9 +215,8 @@ static void console_init(void)
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* if TERM is set to linux (the default) */
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if (!s || strcmp(s, "linux") == 0)
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putenv((char*)"TERM=vt102");
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#if !ENABLE_FEATURE_INIT_SYSLOG
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log_console = NULL;
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#endif
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if (!ENABLE_FEATURE_INIT_SYSLOG)
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log_console = NULL;
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} else if (!s)
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putenv((char*)"TERM=linux");
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}
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@ -290,11 +269,10 @@ static void open_stdio_to_tty(const char* tty_name, int fail)
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tty_name, strerror(errno));
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if (fail)
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_exit(1);
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#if !ENABLE_DEBUG_INIT
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shutdown_signal(SIGUSR1);
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#else
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_exit(2);
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#endif
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if (!ENABLE_DEBUG_INIT)
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shutdown_signal(SIGUSR1);
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else
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_exit(2);
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} else {
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dup2(fd, 0);
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dup2(fd, 1);
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@ -348,9 +326,13 @@ static pid_t run(const struct init_action *a)
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open_stdio_to_tty(a->terminal, 1 /* - exit if open fails*/);
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#ifdef BUT_RUN_ACTIONS_ALREADY_DOES_WAITING
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# define BRAADS 1
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#else
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# define BRAADS 0
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#endif
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/* If the init Action requires us to wait, then force the
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* supplied terminal to be the controlling tty. */
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if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
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if (BRAADS && a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
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/* Now fork off another process to just hang around */
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pid = fork();
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@ -388,7 +370,6 @@ static pid_t run(const struct init_action *a)
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/* Child - fall though to actually execute things */
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}
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#endif
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/* See if any special /bin/sh requiring characters are present */
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if (strpbrk(a->command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
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@ -422,25 +403,29 @@ static pid_t run(const struct init_action *a)
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++cmdpath;
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#ifdef WHY_WE_DO_THIS_SHELL_MUST_HANDLE_THIS_ITSELF
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/* find the last component in the command pathname */
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s = bb_get_last_path_component_nostrip(cmdpath);
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/* make a new argv[0] */
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cmd[0] = malloc(strlen(s) + 2);
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if (cmd[0] == NULL) {
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message(L_LOG | L_CONSOLE, bb_msg_memory_exhausted);
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cmd[0] = cmdpath;
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} else {
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cmd[0][0] = '-';
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strcpy(cmd[0] + 1, s);
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}
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# define WWDTSMHTI 1
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#else
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# define WWDTSMHTI 0
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#endif
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if (WWDTSMHTI) {
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/* find the last component in the command pathname */
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s = bb_get_last_path_component_nostrip(cmdpath);
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/* make a new argv[0] */
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cmd[0] = malloc(strlen(s) + 2);
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if (cmd[0] == NULL) {
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message(L_LOG | L_CONSOLE, bb_msg_memory_exhausted);
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cmd[0] = cmdpath;
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} else {
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cmd[0][0] = '-';
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strcpy(cmd[0] + 1, s);
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}
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}
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#if ENABLE_FEATURE_INIT_SCTTY
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/* Establish this process as session leader and
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* _attempt_ to make stdin a controlling tty.
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*/
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ioctl(0, TIOCSCTTY, 0 /*only try, don't steal*/);
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#endif
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if (ENABLE_FEATURE_INIT_SCTTY)
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ioctl(0, TIOCSCTTY, 0 /*only try, don't steal*/);
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}
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if (a->action & ASKFIRST) {
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@ -470,8 +455,7 @@ static pid_t run(const struct init_action *a)
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message(L_LOG, "starting pid %d, tty '%s': '%s'",
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getpid(), a->terminal, cmdpath);
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#if ENABLE_FEATURE_INIT_COREDUMPS
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{
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if (ENABLE_FEATURE_INIT_COREDUMPS) {
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struct stat sb;
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if (stat(CORE_ENABLE_FLAG_FILE, &sb) == 0) {
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struct rlimit limit;
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@ -481,7 +465,7 @@ static pid_t run(const struct init_action *a)
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setrlimit(RLIMIT_CORE, &limit);
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}
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}
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#endif
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/* Now run it. The new program will take over this PID,
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* so nothing further in init.c should be run. */
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BB_EXECVP(cmdpath, cmd);
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@ -536,7 +520,6 @@ static void run_actions(int action)
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}
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}
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#if !ENABLE_DEBUG_INIT
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static void init_reboot(unsigned long magic)
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{
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pid_t pid;
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@ -676,8 +659,6 @@ static void cont_handler(int sig ATTRIBUTE_UNUSED)
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got_cont = 1;
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}
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#endif /* !ENABLE_DEBUG_INIT */
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static void new_init_action(uint8_t action, const char *command, const char *cons)
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{
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struct init_action *new_action, *a, *last;
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@ -737,14 +718,16 @@ static void delete_init_action(struct init_action *action)
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*/
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static void parse_inittab(void)
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{
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#if ENABLE_FEATURE_USE_INITTAB
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FILE *file;
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char buf[INIT_BUFFS_SIZE];
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file = fopen(INITTAB, "r");
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if (ENABLE_FEATURE_USE_INITTAB)
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file = fopen(INITTAB, "r");
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else
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file = NULL;
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/* No inittab file -- set up some default behavior */
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if (file == NULL) {
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/* No inittab file -- set up some default behavior */
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#endif
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/* Reboot on Ctrl-Alt-Del */
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new_init_action(CTRLALTDEL, "reboot", "");
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/* Umount all filesystems on halt/reboot */
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@ -763,7 +746,6 @@ static void parse_inittab(void)
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new_init_action(SYSINIT, INIT_SCRIPT, "");
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return;
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#if ENABLE_FEATURE_USE_INITTAB
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}
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while (fgets(buf, INIT_BUFFS_SIZE, file) != NULL) {
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@ -823,10 +805,8 @@ static void parse_inittab(void)
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next_line: ;
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}
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fclose(file);
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#endif /* FEATURE_USE_INITTAB */
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}
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#if ENABLE_FEATURE_USE_INITTAB
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static void reload_signal(int sig ATTRIBUTE_UNUSED)
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{
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struct init_action *a, *tmp;
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@ -840,22 +820,21 @@ static void reload_signal(int sig ATTRIBUTE_UNUSED)
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parse_inittab();
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#if ENABLE_FEATURE_KILL_REMOVED
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for (a = init_action_list; a; a = a->next) {
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pid_t pid = a->pid;
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if ((a->action & ONCE) && pid != 0) {
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/* Be nice and send SIGTERM first */
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kill(pid, SIGTERM);
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#if CONFIG_FEATURE_KILL_DELAY
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if (fork() == 0) { /* child */
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sleep(CONFIG_FEATURE_KILL_DELAY);
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kill(pid, SIGKILL);
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_exit(0);
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if (ENABLE_FEATURE_KILL_REMOVED) {
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for (a = init_action_list; a; a = a->next) {
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pid_t pid = a->pid;
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if ((a->action & ONCE) && pid != 0) {
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/* Be nice and send SIGTERM first */
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kill(pid, SIGTERM);
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if (CONFIG_FEATURE_KILL_DELAY)
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if (fork() == 0) { /* child */
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sleep(CONFIG_FEATURE_KILL_DELAY);
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kill(pid, SIGKILL);
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_exit(0);
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}
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}
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#endif
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}
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}
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#endif /* FEATURE_KILL_REMOVED */
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/* remove unused entrys */
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for (a = init_action_list; a; a = tmp) {
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@ -866,7 +845,6 @@ static void reload_signal(int sig ATTRIBUTE_UNUSED)
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}
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run_actions(RESPAWN);
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}
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#endif /* FEATURE_USE_INITTAB */
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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)
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@ -879,30 +857,30 @@ int init_main(int argc, char **argv)
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if (argc > 1 && !strcmp(argv[1], "-q")) {
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return kill(1, SIGHUP);
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}
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#if !ENABLE_DEBUG_INIT
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/* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
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if (getpid() != 1
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&& (!ENABLE_FEATURE_INITRD || !strstr(applet_name, "linuxrc"))
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) {
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bb_show_usage();
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if (!ENABLE_DEBUG_INIT) {
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/* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
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if (getpid() != 1
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&& (!ENABLE_FEATURE_INITRD || !strstr(applet_name, "linuxrc"))
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) {
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bb_show_usage();
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}
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/* Set up sig handlers -- be sure to
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* clear all of these in run() */
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signal(SIGHUP, exec_signal);
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signal(SIGQUIT, exec_signal);
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signal(SIGUSR1, shutdown_signal);
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signal(SIGUSR2, shutdown_signal);
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signal(SIGINT, ctrlaltdel_signal);
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signal(SIGTERM, shutdown_signal);
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signal(SIGCONT, cont_handler);
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signal(SIGSTOP, stop_handler);
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signal(SIGTSTP, stop_handler);
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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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init_reboot(RB_DISABLE_CAD);
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}
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/* Set up sig handlers -- be sure to
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* clear all of these in run() */
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signal(SIGHUP, exec_signal);
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signal(SIGQUIT, exec_signal);
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signal(SIGUSR1, shutdown_signal);
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signal(SIGUSR2, shutdown_signal);
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signal(SIGINT, ctrlaltdel_signal);
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signal(SIGTERM, shutdown_signal);
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signal(SIGCONT, cont_handler);
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signal(SIGSTOP, stop_handler);
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signal(SIGTSTP, stop_handler);
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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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init_reboot(RB_DISABLE_CAD);
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#endif
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/* Figure out where the default console should be */
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console_init();
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@ -986,12 +964,11 @@ int init_main(int argc, char **argv)
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/* Next run anything to be run only once */
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run_actions(ONCE);
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#if ENABLE_FEATURE_USE_INITTAB
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/* Redefine SIGHUP to reread /etc/inittab */
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signal(SIGHUP, reload_signal);
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#else
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signal(SIGHUP, SIG_IGN);
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#endif /* FEATURE_USE_INITTAB */
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if (ENABLE_FEATURE_USE_INITTAB)
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signal(SIGHUP, reload_signal);
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else
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signal(SIGHUP, SIG_IGN);
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/* Now run the looping stuff for the rest of forever */
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while (1) {
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