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authorGravatar Mike Frysinger <vapier@gentoo.org>2007-12-25 04:30:14 +0000
committerGravatar Mike Frysinger <vapier@gentoo.org>2007-12-25 04:30:14 +0000
commitbb50fdfe07072f9e1f25eb6014176ace3f738d08 (patch)
tree44820381a3d1cbbf1d8c879cf05503c2aaef4c37 /init
parentec5631b6d697895ff4f1f750840326f9f035df96 (diff)
downloadbusybox-bb50fdfe07072f9e1f25eb6014176ace3f738d08.tar.gz
busybox-bb50fdfe07072f9e1f25eb6014176ace3f738d08.tar.bz2
convert #if to if -- let gcc optimize away dead code for us
Diffstat (limited to 'init')
-rw-r--r--init/Config.in3
-rw-r--r--init/init.c239
2 files changed, 109 insertions, 133 deletions
diff --git a/init/Config.in b/init/Config.in
index 1084de905..efc8beaf9 100644
--- a/init/Config.in
+++ b/init/Config.in
@@ -37,10 +37,9 @@ config FEATURE_KILL_REMOVED
been removed.
config FEATURE_KILL_DELAY
- int "How long to wait between TERM and KILL (0 - send TERM only)"
+ int "How long to wait between TERM and KILL (0 - send TERM only)" if FEATURE_KILL_REMOVED
range 0 1024
default 0
- depends on FEATURE_KILL_REMOVED
help
With nonzero setting, init sends TERM, forks, child waits N
seconds, sends KILL and exits. Setting it too high is unwise
diff --git a/init/init.c b/init/init.c
index e6581880c..f2e5d9d43 100644
--- a/init/init.c
+++ b/init/init.c
@@ -12,16 +12,12 @@
#include "libbb.h"
#include <paths.h>
#include <sys/reboot.h>
-
-#if ENABLE_FEATURE_INIT_SYSLOG
-# include <sys/syslog.h>
-#endif
+#include <sys/syslog.h>
#define INIT_BUFFS_SIZE 256
#define CONSOLE_NAME_SIZE 32
#define MAXENV 16 /* Number of env. vars */
-#if ENABLE_FEATURE_INIT_COREDUMPS
/*
* When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called
* before processes are spawned to set core file size as unlimited.
@@ -30,7 +26,6 @@
*/
#define CORE_ENABLE_FLAG_FILE "/.init_enable_core"
#include <sys/resource.h>
-#endif
#define INITTAB "/etc/inittab" /* inittab file location */
#ifndef INIT_SCRIPT
@@ -68,12 +63,8 @@ struct init_action {
/* Static variables */
static struct init_action *init_action_list = NULL;
-#if !ENABLE_FEATURE_INIT_SYSLOG
static const char *log_console = VC_5;
-#endif
-#if !ENABLE_DEBUG_INIT
static sig_atomic_t got_cont = 0;
-#endif
enum {
L_LOG = 0x1,
@@ -105,33 +96,22 @@ static const char *const environment[] = {
/* Function prototypes */
static void delete_init_action(struct init_action *a);
static int waitfor(pid_t pid);
-#if !ENABLE_DEBUG_INIT
static void shutdown_signal(int sig);
-#endif
-#if !ENABLE_DEBUG_INIT
static void loop_forever(void)
{
while (1)
sleep(1);
}
-#endif
/* Print a message to the specified device.
* Device may be bitwise-or'd from L_LOG | L_CONSOLE */
-#if ENABLE_DEBUG_INIT
-#define messageD message
-#else
-#define messageD(...) do {} while (0)
-#endif
+#define messageD(...) do { if (ENABLE_DEBUG_INIT) message(__VA_ARGS__); } while (0)
static void message(int device, const char *fmt, ...)
__attribute__ ((format(printf, 2, 3)));
static void message(int device, const char *fmt, ...)
{
-#if !ENABLE_FEATURE_INIT_SYSLOG
static int log_fd = -1;
-#endif
-
va_list arguments;
int l;
char msg[128];
@@ -143,40 +123,40 @@ static void message(int device, const char *fmt, ...)
msg[sizeof(msg) - 2] = '\0';
l = strlen(msg);
-#if ENABLE_FEATURE_INIT_SYSLOG
- /* Log the message to syslogd */
- if (device & L_LOG) {
- /* don't out "\r" */
- openlog(applet_name, 0, LOG_DAEMON);
- syslog(LOG_INFO, "init: %s", msg + 1);
- closelog();
- }
- msg[l++] = '\n';
- msg[l] = '\0';
-#else
- msg[l++] = '\n';
- msg[l] = '\0';
- /* Take full control of the log tty, and never close it.
- * It's mine, all mine! Muhahahaha! */
- if (log_fd < 0) {
- if (!log_console) {
- log_fd = 2;
- } else {
- log_fd = device_open(log_console, O_WRONLY | O_NONBLOCK | O_NOCTTY);
- if (log_fd < 0) {
- bb_error_msg("can't log to %s", log_console);
- device = L_CONSOLE;
+ if (ENABLE_FEATURE_INIT_SYSLOG) {
+ /* Log the message to syslogd */
+ if (device & L_LOG) {
+ /* don't out "\r" */
+ openlog(applet_name, 0, LOG_DAEMON);
+ syslog(LOG_INFO, "init: %s", msg + 1);
+ closelog();
+ }
+ msg[l++] = '\n';
+ msg[l] = '\0';
+ } else {
+ msg[l++] = '\n';
+ msg[l] = '\0';
+ /* Take full control of the log tty, and never close it.
+ * It's mine, all mine! Muhahahaha! */
+ if (log_fd < 0) {
+ if (!log_console) {
+ log_fd = 2;
} else {
- close_on_exec_on(log_fd);
+ log_fd = device_open(log_console, O_WRONLY | O_NONBLOCK | O_NOCTTY);
+ if (log_fd < 0) {
+ bb_error_msg("can't log to %s", log_console);
+ device = L_CONSOLE;
+ } else {
+ close_on_exec_on(log_fd);
+ }
}
}
+ if (device & L_LOG) {
+ full_write(log_fd, msg, l);
+ if (log_fd == 2)
+ return; /* don't print dup messages */
+ }
}
- if (device & L_LOG) {
- full_write(log_fd, msg, l);
- if (log_fd == 2)
- return; /* don't print dup messages */
- }
-#endif
if (device & L_CONSOLE) {
/* Send console messages to console so people will see them. */
@@ -235,9 +215,8 @@ static void console_init(void)
* if TERM is set to linux (the default) */
if (!s || strcmp(s, "linux") == 0)
putenv((char*)"TERM=vt102");
-#if !ENABLE_FEATURE_INIT_SYSLOG
- log_console = NULL;
-#endif
+ if (!ENABLE_FEATURE_INIT_SYSLOG)
+ log_console = NULL;
} else if (!s)
putenv((char*)"TERM=linux");
}
@@ -290,11 +269,10 @@ static void open_stdio_to_tty(const char* tty_name, int fail)
tty_name, strerror(errno));
if (fail)
_exit(1);
-#if !ENABLE_DEBUG_INIT
- shutdown_signal(SIGUSR1);
-#else
- _exit(2);
-#endif
+ if (!ENABLE_DEBUG_INIT)
+ shutdown_signal(SIGUSR1);
+ else
+ _exit(2);
} else {
dup2(fd, 0);
dup2(fd, 1);
@@ -348,9 +326,13 @@ static pid_t run(const struct init_action *a)
open_stdio_to_tty(a->terminal, 1 /* - exit if open fails*/);
#ifdef BUT_RUN_ACTIONS_ALREADY_DOES_WAITING
+# define BRAADS 1
+#else
+# define BRAADS 0
+#endif
/* If the init Action requires us to wait, then force the
* supplied terminal to be the controlling tty. */
- if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
+ if (BRAADS && a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
/* Now fork off another process to just hang around */
pid = fork();
@@ -388,7 +370,6 @@ static pid_t run(const struct init_action *a)
/* Child - fall though to actually execute things */
}
-#endif
/* See if any special /bin/sh requiring characters are present */
if (strpbrk(a->command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
@@ -422,25 +403,29 @@ static pid_t run(const struct init_action *a)
++cmdpath;
#ifdef WHY_WE_DO_THIS_SHELL_MUST_HANDLE_THIS_ITSELF
- /* find the last component in the command pathname */
- s = bb_get_last_path_component_nostrip(cmdpath);
- /* make a new argv[0] */
- cmd[0] = malloc(strlen(s) + 2);
- if (cmd[0] == NULL) {
- message(L_LOG | L_CONSOLE, bb_msg_memory_exhausted);
- cmd[0] = cmdpath;
- } else {
- cmd[0][0] = '-';
- strcpy(cmd[0] + 1, s);
- }
+# define WWDTSMHTI 1
+#else
+# define WWDTSMHTI 0
#endif
+ if (WWDTSMHTI) {
+ /* find the last component in the command pathname */
+ s = bb_get_last_path_component_nostrip(cmdpath);
+ /* make a new argv[0] */
+ cmd[0] = malloc(strlen(s) + 2);
+ if (cmd[0] == NULL) {
+ message(L_LOG | L_CONSOLE, bb_msg_memory_exhausted);
+ cmd[0] = cmdpath;
+ } else {
+ cmd[0][0] = '-';
+ strcpy(cmd[0] + 1, s);
+ }
+ }
-#if ENABLE_FEATURE_INIT_SCTTY
/* Establish this process as session leader and
* _attempt_ to make stdin a controlling tty.
*/
- ioctl(0, TIOCSCTTY, 0 /*only try, don't steal*/);
-#endif
+ if (ENABLE_FEATURE_INIT_SCTTY)
+ ioctl(0, TIOCSCTTY, 0 /*only try, don't steal*/);
}
if (a->action & ASKFIRST) {
@@ -470,8 +455,7 @@ static pid_t run(const struct init_action *a)
message(L_LOG, "starting pid %d, tty '%s': '%s'",
getpid(), a->terminal, cmdpath);
-#if ENABLE_FEATURE_INIT_COREDUMPS
- {
+ if (ENABLE_FEATURE_INIT_COREDUMPS) {
struct stat sb;
if (stat(CORE_ENABLE_FLAG_FILE, &sb) == 0) {
struct rlimit limit;
@@ -481,7 +465,7 @@ static pid_t run(const struct init_action *a)
setrlimit(RLIMIT_CORE, &limit);
}
}
-#endif
+
/* Now run it. The new program will take over this PID,
* so nothing further in init.c should be run. */
BB_EXECVP(cmdpath, cmd);
@@ -536,7 +520,6 @@ static void run_actions(int action)
}
}
-#if !ENABLE_DEBUG_INIT
static void init_reboot(unsigned long magic)
{
pid_t pid;
@@ -676,8 +659,6 @@ static void cont_handler(int sig ATTRIBUTE_UNUSED)
got_cont = 1;
}
-#endif /* !ENABLE_DEBUG_INIT */
-
static void new_init_action(uint8_t action, const char *command, const char *cons)
{
struct init_action *new_action, *a, *last;
@@ -737,14 +718,16 @@ static void delete_init_action(struct init_action *action)
*/
static void parse_inittab(void)
{
-#if ENABLE_FEATURE_USE_INITTAB
FILE *file;
char buf[INIT_BUFFS_SIZE];
- file = fopen(INITTAB, "r");
+ if (ENABLE_FEATURE_USE_INITTAB)
+ file = fopen(INITTAB, "r");
+ else
+ file = NULL;
+
+ /* No inittab file -- set up some default behavior */
if (file == NULL) {
- /* No inittab file -- set up some default behavior */
-#endif
/* Reboot on Ctrl-Alt-Del */
new_init_action(CTRLALTDEL, "reboot", "");
/* Umount all filesystems on halt/reboot */
@@ -763,7 +746,6 @@ static void parse_inittab(void)
new_init_action(SYSINIT, INIT_SCRIPT, "");
return;
-#if ENABLE_FEATURE_USE_INITTAB
}
while (fgets(buf, INIT_BUFFS_SIZE, file) != NULL) {
@@ -823,10 +805,8 @@ static void parse_inittab(void)
next_line: ;
}
fclose(file);
-#endif /* FEATURE_USE_INITTAB */
}
-#if ENABLE_FEATURE_USE_INITTAB
static void reload_signal(int sig ATTRIBUTE_UNUSED)
{
struct init_action *a, *tmp;
@@ -840,22 +820,21 @@ static void reload_signal(int sig ATTRIBUTE_UNUSED)
parse_inittab();
-#if ENABLE_FEATURE_KILL_REMOVED
- for (a = init_action_list; a; a = a->next) {
- pid_t pid = a->pid;
- if ((a->action & ONCE) && pid != 0) {
- /* Be nice and send SIGTERM first */
- kill(pid, SIGTERM);
-#if CONFIG_FEATURE_KILL_DELAY
- if (fork() == 0) { /* child */
- sleep(CONFIG_FEATURE_KILL_DELAY);
- kill(pid, SIGKILL);
- _exit(0);
+ if (ENABLE_FEATURE_KILL_REMOVED) {
+ for (a = init_action_list; a; a = a->next) {
+ pid_t pid = a->pid;
+ if ((a->action & ONCE) && pid != 0) {
+ /* Be nice and send SIGTERM first */
+ kill(pid, SIGTERM);
+ if (CONFIG_FEATURE_KILL_DELAY)
+ if (fork() == 0) { /* child */
+ sleep(CONFIG_FEATURE_KILL_DELAY);
+ kill(pid, SIGKILL);
+ _exit(0);
+ }
}
-#endif
}
}
-#endif /* FEATURE_KILL_REMOVED */
/* remove unused entrys */
for (a = init_action_list; a; a = tmp) {
@@ -866,7 +845,6 @@ static void reload_signal(int sig ATTRIBUTE_UNUSED)
}
run_actions(RESPAWN);
}
-#endif /* FEATURE_USE_INITTAB */
int init_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int init_main(int argc, char **argv)
@@ -879,30 +857,30 @@ int init_main(int argc, char **argv)
if (argc > 1 && !strcmp(argv[1], "-q")) {
return kill(1, SIGHUP);
}
-#if !ENABLE_DEBUG_INIT
- /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
- if (getpid() != 1
- && (!ENABLE_FEATURE_INITRD || !strstr(applet_name, "linuxrc"))
- ) {
- bb_show_usage();
- }
- /* Set up sig handlers -- be sure to
- * clear all of these in run() */
- signal(SIGHUP, exec_signal);
- signal(SIGQUIT, exec_signal);
- signal(SIGUSR1, shutdown_signal);
- signal(SIGUSR2, shutdown_signal);
- signal(SIGINT, ctrlaltdel_signal);
- signal(SIGTERM, shutdown_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... */
- init_reboot(RB_DISABLE_CAD);
-#endif
+ if (!ENABLE_DEBUG_INIT) {
+ /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
+ if (getpid() != 1
+ && (!ENABLE_FEATURE_INITRD || !strstr(applet_name, "linuxrc"))
+ ) {
+ bb_show_usage();
+ }
+ /* Set up sig handlers -- be sure to
+ * clear all of these in run() */
+ signal(SIGHUP, exec_signal);
+ signal(SIGQUIT, exec_signal);
+ signal(SIGUSR1, shutdown_signal);
+ signal(SIGUSR2, shutdown_signal);
+ signal(SIGINT, ctrlaltdel_signal);
+ signal(SIGTERM, shutdown_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... */
+ init_reboot(RB_DISABLE_CAD);
+ }
/* Figure out where the default console should be */
console_init();
@@ -986,12 +964,11 @@ int init_main(int argc, char **argv)
/* Next run anything to be run only once */
run_actions(ONCE);
-#if ENABLE_FEATURE_USE_INITTAB
/* Redefine SIGHUP to reread /etc/inittab */
- signal(SIGHUP, reload_signal);
-#else
- signal(SIGHUP, SIG_IGN);
-#endif /* FEATURE_USE_INITTAB */
+ if (ENABLE_FEATURE_USE_INITTAB)
+ signal(SIGHUP, reload_signal);
+ else
+ signal(SIGHUP, SIG_IGN);
/* Now run the looping stuff for the rest of forever */
while (1) {