#include <paths.h>
#include <sys/reboot.h>
-#define INIT_BUFFS_SIZE 256
+/* Was a CONFIG_xxx option. A lot of people were building
+ * not fully functional init by switching it on! */
+#define DEBUG_INIT 0
+
+#define COMMAND_SIZE 256
#define CONSOLE_NAME_SIZE 32
#define MAXENV 16 /* Number of env. vars */
#endif
/* Allowed init action types */
-#define SYSINIT 0x001
-#define RESPAWN 0x002
-#define ASKFIRST 0x004
-#define WAIT 0x008
-#define ONCE 0x010
-#define CTRLALTDEL 0x020
-#define SHUTDOWN 0x040
-#define RESTART 0x080
-
-#define STR_SYSINIT "\x01"
-#define STR_RESPAWN "\x02"
-#define STR_ASKFIRST "\x04"
-#define STR_WAIT "\x08"
-#define STR_ONCE "\x10"
-#define STR_CTRLALTDEL "\x20"
-#define STR_SHUTDOWN "\x40"
-#define STR_RESTART "\x80"
+#define SYSINIT 0x01
+#define RESPAWN 0x02
+/* like respawn, but wait for <Enter> to be pressed on tty: */
+#define ASKFIRST 0x04
+#define WAIT 0x08
+#define ONCE 0x10
+#define CTRLALTDEL 0x20
+#define SHUTDOWN 0x40
+#define RESTART 0x80
/* Set up a linked list of init_actions, to be read from inittab */
struct init_action {
struct init_action *next;
pid_t pid;
- uint8_t action;
+ uint8_t action_type;
char terminal[CONSOLE_NAME_SIZE];
- char command[INIT_BUFFS_SIZE];
+ char command[COMMAND_SIZE];
};
/* Static variables */
#endif
};
-static const char *const environment[] = {
- "HOME=/",
- bb_PATH_root_path,
- "SHELL=/bin/sh",
- "USER=root",
- NULL
-};
-
/* Function prototypes */
-static void delete_init_action(struct init_action *a);
-static void halt_reboot_pwoff(int sig) ATTRIBUTE_NORETURN;
+static void halt_reboot_pwoff(int sig) NORETURN;
static void waitfor(pid_t pid)
{
continue;
}
-static void loop_forever(void) ATTRIBUTE_NORETURN;
+static void loop_forever(void) NORETURN;
static void loop_forever(void)
{
while (1)
}
/* Print a message to the specified device.
- * Device may be bitwise-or'd from L_LOG | L_CONSOLE */
-#define messageD(...) do { if (ENABLE_DEBUG_INIT) message(__VA_ARGS__); } while (0)
-static void message(int device, const char *fmt, ...)
+ * "where" may be bitwise-or'd from L_LOG | L_CONSOLE
+ * NB: careful, we can be called after vfork!
+ */
+#define messageD(...) do { if (DEBUG_INIT) message(__VA_ARGS__); } while (0)
+static void message(int where, const char *fmt, ...)
__attribute__ ((format(printf, 2, 3)));
-static void message(int device, const char *fmt, ...)
+static void message(int where, const char *fmt, ...)
{
static int log_fd = -1;
va_list arguments;
- int l;
+ unsigned l;
char msg[128];
msg[0] = '\r';
va_start(arguments, fmt);
- vsnprintf(msg + 1, sizeof(msg) - 2, fmt, arguments);
+ l = vsnprintf(msg + 1, sizeof(msg) - 2, fmt, arguments);
+ if (l > sizeof(msg) - 2)
+ l = sizeof(msg) - 2;
+ msg[l] = '\0';
va_end(arguments);
- 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" */
+ if (where & L_LOG) {
+ /* don't print out "\r" */
openlog(applet_name, 0, LOG_DAEMON);
syslog(LOG_INFO, "init: %s", msg + 1);
closelog();
* It's mine, all mine! Muhahahaha! */
if (log_fd < 0) {
if (!log_console) {
- log_fd = 2;
+ log_fd = STDERR_FILENO;
} 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;
+ where = L_CONSOLE;
} else {
close_on_exec_on(log_fd);
}
}
}
- if (device & L_LOG) {
+ if (where & L_LOG) {
full_write(log_fd, msg, l);
- if (log_fd == 2)
+ if (log_fd == STDERR_FILENO)
return; /* don't print dup messages */
}
}
- if (device & L_CONSOLE) {
+ if (where & L_CONSOLE) {
/* Send console messages to console so people will see them. */
- full_write(2, msg, l);
+ full_write(STDERR_FILENO, msg, l);
}
}
char *s;
s = getenv("CONSOLE");
- if (!s) s = getenv("console");
+ if (!s)
+ s = getenv("console");
if (s) {
int fd = open(s, O_RDWR | O_NONBLOCK | O_NOCTTY);
if (fd >= 0) {
- dup2(fd, 0);
- dup2(fd, 1);
- dup2(fd, 2);
- while (fd > 2) close(fd--);
+ dup2(fd, STDIN_FILENO);
+ dup2(fd, STDOUT_FILENO);
+ xmove_fd(fd, STDERR_FILENO);
}
messageD(L_LOG, "console='%s'", s);
} else {
- /* Make sure fd 0,1,2 are not closed */
+ /* Make sure fd 0,1,2 are not closed
+ * (so that they won't be used by future opens) */
bb_sanitize_stdio();
+ /* Make sure init can't be blocked by writing to stderr */
+ fcntl(STDERR_FILENO, F_SETFL, fcntl(STDERR_FILENO, F_GETFL) | O_NONBLOCK);
}
s = getenv("TERM");
- if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
+ if (ioctl(STDIN_FILENO, TIOCGSERIAL, &sr) == 0) {
/* Force the TERM setting to vt102 for serial console
* if TERM is set to linux (the default) */
if (!s || strcmp(s, "linux") == 0)
putenv((char*)"TERM=linux");
}
-/* Set terminal settings to reasonable defaults */
+/* Set terminal settings to reasonable defaults.
+ * NB: careful, we can be called after vfork! */
static void set_sane_term(void)
{
struct termios tty;
tty.c_cc[VSTOP] = 19; /* C-s */
tty.c_cc[VSUSP] = 26; /* C-z */
- /* use line dicipline 0 */
+ /* use line discipline 0 */
tty.c_line = 0;
/* Make it be sane */
tty.c_lflag =
ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
- tcsetattr(STDIN_FILENO, TCSANOW, &tty);
+ tcsetattr_stdin_TCSANOW(&tty);
}
-/* Open the new terminal device */
+/* Open the new terminal device.
+ * NB: careful, we can be called after vfork! */
static void open_stdio_to_tty(const char* tty_name, int exit_on_failure)
{
/* empty tty_name means "use init's tty", else... */
if (tty_name[0]) {
int fd;
- close(0);
+ close(STDIN_FILENO);
/* fd can be only < 0 or 0: */
fd = device_open(tty_name, O_RDWR);
if (fd) {
- message(L_LOG | L_CONSOLE, "Can't open %s: %s",
+ message(L_LOG | L_CONSOLE, "can't open %s: %s",
tty_name, strerror(errno));
if (exit_on_failure)
- _exit(1);
- if (ENABLE_DEBUG_INIT)
+ _exit(EXIT_FAILURE);
+ if (DEBUG_INIT)
_exit(2);
+ /* NB: we don't reach this if we were called after vfork.
+ * Thus halt_reboot_pwoff() itself need not be vfork-safe. */
halt_reboot_pwoff(SIGUSR1); /* halt the system */
}
- dup2(0, 1);
- dup2(0, 2);
+ dup2(STDIN_FILENO, STDOUT_FILENO);
+ dup2(STDIN_FILENO, STDERR_FILENO);
}
set_sane_term();
}
+/* Wrapper around exec:
+ * Takes string (max COMMAND_SIZE chars).
+ * If chars like '>' detected, execs '[-]/bin/sh -c "exec ......."'.
+ * Otherwise splits words on whitespace, deals with leading dash,
+ * and uses plain exec().
+ * NB: careful, we can be called after vfork!
+ */
+static void init_exec(const char *command)
+{
+ char *cmd[COMMAND_SIZE / 2];
+ char buf[COMMAND_SIZE + 6]; /* COMMAND_SIZE+strlen("exec ")+1 */
+ int dash = (command[0] == '-' /* maybe? && command[1] == '/' */);
+
+ /* See if any special /bin/sh requiring characters are present */
+ if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
+ strcpy(buf, "exec ");
+ strcpy(buf + 5, command + dash); /* excluding "-" */
+ /* NB: LIBBB_DEFAULT_LOGIN_SHELL define has leading dash */
+ cmd[0] = (char*)(LIBBB_DEFAULT_LOGIN_SHELL + !dash);
+ cmd[1] = (char*)"-c";
+ cmd[2] = buf;
+ cmd[3] = NULL;
+ } else {
+ /* Convert command (char*) into cmd (char**, one word per string) */
+ char *word, *next;
+ int i = 0;
+ next = strcpy(buf, command); /* including "-" */
+ while ((word = strsep(&next, " \t")) != NULL) {
+ if (*word != '\0') { /* not two spaces/tabs together? */
+ cmd[i] = word;
+ i++;
+ }
+ }
+ cmd[i] = NULL;
+ }
+ /* If we saw leading "-", it is interactive shell.
+ * Try harder to give it a controlling tty.
+ * And skip "-" in actual exec call. */
+ if (dash) {
+ /* _Attempt_ to make stdin a controlling tty. */
+ if (ENABLE_FEATURE_INIT_SCTTY)
+ ioctl(STDIN_FILENO, TIOCSCTTY, 0 /*only try, don't steal*/);
+ }
+ BB_EXECVP(cmd[0] + dash, cmd);
+ message(L_LOG | L_CONSOLE, "cannot run '%s': %s", cmd[0], strerror(errno));
+ /* returns if execvp fails */
+}
+
/* Used only by run_actions */
static pid_t run(const struct init_action *a)
{
- int i;
pid_t pid;
- char *s, *tmpCmd, *cmdpath;
- char *cmd[INIT_BUFFS_SIZE];
- char buf[INIT_BUFFS_SIZE + 6]; /* INIT_BUFFS_SIZE+strlen("exec ")+1 */
sigset_t nmask, omask;
/* Block sigchild while forking (why?) */
sigemptyset(&nmask);
sigaddset(&nmask, SIGCHLD);
sigprocmask(SIG_BLOCK, &nmask, &omask);
- pid = fork();
+ if (BB_MMU && (a->action_type & ASKFIRST))
+ pid = fork();
+ else
+ pid = vfork();
sigprocmask(SIG_SETMASK, &omask, NULL);
if (pid < 0)
- message(L_LOG | L_CONSOLE, "Can't fork");
+ message(L_LOG | L_CONSOLE, "can't fork");
if (pid)
return pid;
setsid();
/* Open the new terminal device */
- open_stdio_to_tty(a->terminal, 1 /* - exit if open fails*/);
+ open_stdio_to_tty(a->terminal, 1 /* - exit if open fails */);
+// NB: do not enable unless you change vfork to fork above
#ifdef BUT_RUN_ACTIONS_ALREADY_DOES_WAITING
/* 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 (a->action_type & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
/* Now fork off another process to just hang around */
pid = fork();
if (pid < 0) {
- message(L_LOG | L_CONSOLE, "Can't fork");
- _exit(1);
+ message(L_LOG | L_CONSOLE, "can't fork");
+ _exit(EXIT_FAILURE);
}
if (pid > 0) {
waitfor(pid);
/* See if stealing the controlling tty back is necessary */
if (tcgetpgrp(0) != getpid())
- _exit(0);
+ _exit(EXIT_SUCCESS);
/* Use a temporary process to steal the controlling tty. */
pid = fork();
if (pid < 0) {
- message(L_LOG | L_CONSOLE, "Can't fork");
- _exit(1);
+ message(L_LOG | L_CONSOLE, "can't fork");
+ _exit(EXIT_FAILURE);
}
if (pid == 0) {
setsid();
ioctl(0, TIOCSCTTY, 1);
- _exit(0);
+ _exit(EXIT_SUCCESS);
}
waitfor(pid);
- _exit(0);
+ _exit(EXIT_SUCCESS);
}
-
/* Child - fall though to actually execute things */
}
#endif
- /* See if any special /bin/sh requiring characters are present */
- if (strpbrk(a->command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
- cmd[0] = (char*)DEFAULT_SHELL;
- cmd[1] = (char*)"-c";
- cmd[2] = strcat(strcpy(buf, "exec "), a->command);
- cmd[3] = NULL;
- } else {
- /* Convert command (char*) into cmd (char**, one word per string) */
- strcpy(buf, a->command);
- s = buf;
- for (tmpCmd = buf, i = 0; (tmpCmd = strsep(&s, " \t")) != NULL;) {
- if (*tmpCmd != '\0') {
- cmd[i] = tmpCmd;
- i++;
- }
- }
- cmd[i] = NULL;
- }
-
- cmdpath = cmd[0];
-
- /*
- * Interactive shells want to see a dash in argv[0]. This
- * typically is handled by login, argv will be setup this
- * way if a dash appears at the front of the command path
- * (like "-/bin/sh").
- */
- if (*cmdpath == '-') {
- /* skip over the dash */
- ++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);
- }
-#endif
-
- /* _Attempt_ to make stdin a controlling tty. */
- if (ENABLE_FEATURE_INIT_SCTTY)
- ioctl(0, TIOCSCTTY, 0 /*only try, don't steal*/);
- }
-
- if (a->action & ASKFIRST) {
+ /* NB: on NOMMU we can't wait for input in child, so
+ * "askfirst" will work the same as "respawn". */
+ if (BB_MMU && (a->action_type & ASKFIRST)) {
static const char press_enter[] ALIGN1 =
#ifdef CUSTOMIZED_BANNER
#include CUSTOMIZED_BANNER
*/
messageD(L_LOG, "waiting for enter to start '%s'"
"(pid %d, tty '%s')\n",
- cmdpath, getpid(), a->terminal);
- full_write(1, press_enter, sizeof(press_enter) - 1);
- while (safe_read(0, &c, 1) == 1 && c != '\n')
+ a->command, getpid(), a->terminal);
+ full_write(STDOUT_FILENO, press_enter, sizeof(press_enter) - 1);
+ while (safe_read(STDIN_FILENO, &c, 1) == 1 && c != '\n')
continue;
}
- /* Log the process name and args */
- message(L_LOG, "starting pid %d, tty '%s': '%s'",
- getpid(), a->terminal, cmdpath);
-
if (ENABLE_FEATURE_INIT_COREDUMPS) {
struct stat sb;
if (stat(CORE_ENABLE_FLAG_FILE, &sb) == 0) {
struct rlimit limit;
-
limit.rlim_cur = RLIM_INFINITY;
limit.rlim_max = RLIM_INFINITY;
setrlimit(RLIMIT_CORE, &limit);
}
}
+ /* Log the process name and args */
+ message(L_LOG, "starting pid %d, tty '%s': '%s'",
+ getpid(), a->terminal, a->command);
+
/* Now run it. The new program will take over this PID,
* so nothing further in init.c should be run. */
- BB_EXECVP(cmdpath, cmd);
-
+ init_exec(a->command);
/* We're still here? Some error happened. */
- message(L_LOG | L_CONSOLE, "Cannot run '%s': %s",
- cmdpath, strerror(errno));
_exit(-1);
}
+static void delete_init_action(struct init_action *action)
+{
+ struct init_action *a, *b = NULL;
+
+ for (a = init_action_list; a; b = a, a = a->next) {
+ if (a == action) {
+ if (b == NULL) {
+ init_action_list = a->next;
+ } else {
+ b->next = a->next;
+ }
+ free(a);
+ break;
+ }
+ }
+}
+
/* Run all commands of a particular type */
-static void run_actions(int action)
+static void run_actions(int action_type)
{
struct init_action *a, *tmp;
for (a = init_action_list; a; a = tmp) {
tmp = a->next;
- if (a->action == action) {
+ if (a->action_type & action_type) {
// Pointless: run() will error out if open of device fails.
///* a->terminal of "" means "init's console" */
//if (a->terminal[0] && access(a->terminal, R_OK | W_OK)) {
// //message(L_LOG | L_CONSOLE, "Device %s cannot be opened in RW mode", a->terminal /*, strerror(errno)*/);
// delete_init_action(a);
//} else
- if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
+ if (a->action_type & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
waitfor(run(a));
delete_init_action(a);
- } else if (a->action & ONCE) {
+ } else if (a->action_type & ONCE) {
run(a);
delete_init_action(a);
- } else if (a->action & (RESPAWN | ASKFIRST)) {
+ } else if (a->action_type & (RESPAWN | ASKFIRST)) {
/* Only run stuff with pid==0. If they have
* a pid, that means it is still running */
if (a->pid == 0) {
static void init_reboot(unsigned long magic)
{
pid_t pid;
- /* We have to fork here, since the kernel calls do_exit(0) in
+ /* We have to fork here, since the kernel calls do_exit(EXIT_SUCCESS) in
* linux/kernel/sys.c, which can cause the machine to panic when
* the init process is killed.... */
pid = vfork();
if (pid == 0) { /* child */
reboot(magic);
- _exit(0);
+ _exit(EXIT_SUCCESS);
}
waitfor(pid);
}
static void kill_all_processes(void)
{
- sigset_t block_signals;
-
/* run everything to be run at "shutdown". This is done _prior_
* to killing everything, in case people wish to use scripts to
* shut things down gracefully... */
run_actions(SHUTDOWN);
/* first disable all our signals */
- sigfillset(&block_signals);
- /*sigemptyset(&block_signals);
- sigaddset(&block_signals, SIGHUP);
- sigaddset(&block_signals, SIGQUIT);
- sigaddset(&block_signals, SIGCHLD);
- sigaddset(&block_signals, SIGUSR1);
- sigaddset(&block_signals, SIGUSR2);
- sigaddset(&block_signals, SIGINT);
- sigaddset(&block_signals, SIGTERM);
- sigaddset(&block_signals, SIGCONT);
- sigaddset(&block_signals, SIGSTOP);
- sigaddset(&block_signals, SIGTSTP);*/
- sigprocmask(SIG_BLOCK, &block_signals, NULL);
+ sigprocmask_allsigs(SIG_BLOCK);
message(L_CONSOLE | L_LOG, "The system is going down NOW!");
static void halt_reboot_pwoff(int sig)
{
- const char *m;
+ const char *m = "halt";
int rb;
kill_all_processes();
- m = "halt";
rb = RB_HALT_SYSTEM;
if (sig == SIGTERM) {
m = "reboot";
loop_forever();
}
-/* Handler for HUP and QUIT - exec "restart" action,
+/* Handler for QUIT - exec "restart" action,
* else (no such action defined) do nothing */
-static void exec_restart_action(int sig ATTRIBUTE_UNUSED)
+static void exec_restart_action(int sig UNUSED_PARAM)
{
- struct init_action *a, *tmp;
- sigset_t unblock_signals;
+ struct init_action *a;
- for (a = init_action_list; a; a = tmp) {
- tmp = a->next;
- if (a->action & RESTART) {
+ for (a = init_action_list; a; a = a->next) {
+ if (a->action_type & RESTART) {
kill_all_processes();
/* unblock all signals (blocked in kill_all_processes()) */
- sigfillset(&unblock_signals);
- /*sigemptyset(&unblock_signals);
- sigaddset(&unblock_signals, SIGHUP);
- sigaddset(&unblock_signals, SIGQUIT);
- sigaddset(&unblock_signals, SIGCHLD);
- sigaddset(&unblock_signals, SIGUSR1);
- sigaddset(&unblock_signals, SIGUSR2);
- sigaddset(&unblock_signals, SIGINT);
- sigaddset(&unblock_signals, SIGTERM);
- sigaddset(&unblock_signals, SIGCONT);
- sigaddset(&unblock_signals, SIGSTOP);
- sigaddset(&unblock_signals, SIGTSTP);*/
- sigprocmask(SIG_UNBLOCK, &unblock_signals, NULL);
+ sigprocmask_allsigs(SIG_UNBLOCK);
/* Open the new terminal device */
open_stdio_to_tty(a->terminal, 0 /* - halt if open fails */);
messageD(L_CONSOLE | L_LOG, "Trying to re-exec %s", a->command);
- BB_EXECLP(a->command, a->command, NULL);
-
- message(L_CONSOLE | L_LOG, "Cannot run '%s': %s",
- a->command, strerror(errno));
+ init_exec(a->command);
sleep(2);
init_reboot(RB_HALT_SYSTEM);
loop_forever();
}
}
-static void ctrlaltdel_signal(int sig ATTRIBUTE_UNUSED)
+static void ctrlaltdel_signal(int sig UNUSED_PARAM)
{
run_actions(CTRLALTDEL);
}
/* The SIGSTOP & SIGTSTP handler */
-static void stop_handler(int sig ATTRIBUTE_UNUSED)
+static void stop_handler(int sig UNUSED_PARAM)
{
int saved_errno = errno;
}
/* The SIGCONT handler */
-static void cont_handler(int sig ATTRIBUTE_UNUSED)
+static void cont_handler(int sig UNUSED_PARAM)
{
got_cont = 1;
}
-static void new_init_action(uint8_t action, const char *command, const char *cons)
+static void new_init_action(uint8_t action_type, const char *command, const char *cons)
{
- struct init_action *new_action, *a, *last;
+ struct init_action *a, *last;
- if (strcmp(cons, bb_dev_null) == 0 && (action & ASKFIRST))
- return;
+// Why?
+// if (strcmp(cons, bb_dev_null) == 0 && (action & ASKFIRST))
+// return;
/* Append to the end of the list */
for (a = last = init_action_list; a; a = a->next) {
if ((strcmp(a->command, command) == 0)
&& (strcmp(a->terminal, cons) == 0)
) {
- a->action = action;
+ a->action_type = action_type;
return;
}
last = a;
}
- new_action = xzalloc(sizeof(struct init_action));
+ a = xzalloc(sizeof(*a));
if (last) {
- last->next = new_action;
+ last->next = a;
} else {
- init_action_list = new_action;
+ init_action_list = a;
}
- strcpy(new_action->command, command);
- new_action->action = action;
- strcpy(new_action->terminal, cons);
+ a->action_type = action_type;
+ safe_strncpy(a->command, command, sizeof(a->command));
+ safe_strncpy(a->terminal, cons, sizeof(a->terminal));
messageD(L_LOG | L_CONSOLE, "command='%s' action=%d tty='%s'\n",
- new_action->command, new_action->action, new_action->terminal);
-}
-
-static void delete_init_action(struct init_action *action)
-{
- struct init_action *a, *b = NULL;
-
- for (a = init_action_list; a; b = a, a = a->next) {
- if (a == action) {
- if (b == NULL) {
- init_action_list = a->next;
- } else {
- b->next = a->next;
- }
- free(a);
- break;
- }
- }
+ a->command, a->action_type, a->terminal);
}
/* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
*/
static void parse_inittab(void)
{
- FILE *file;
- char buf[INIT_BUFFS_SIZE];
-
- if (ENABLE_FEATURE_USE_INITTAB)
- file = fopen(INITTAB, "r");
- else
- file = NULL;
+ char *token[4];
+ /* order must correspond to SYSINIT..RESTART constants */
+ static const char actions[] ALIGN1 =
+ "sysinit\0""respawn\0""askfirst\0""wait\0""once\0"
+ "ctrlaltdel\0""shutdown\0""restart\0";
+ parser_t *parser = config_open2(INITTAB, fopen_for_read);
/* No inittab file -- set up some default behavior */
- if (file == NULL) {
+ if (parser == NULL) {
/* Reboot on Ctrl-Alt-Del */
new_init_action(CTRLALTDEL, "reboot", "");
/* Umount all filesystems on halt/reboot */
/* Swapoff on halt/reboot */
if (ENABLE_SWAPONOFF)
new_init_action(SHUTDOWN, "swapoff -a", "");
- /* Prepare to restart init when a HUP is received */
+ /* Prepare to restart init when a QUIT is received */
new_init_action(RESTART, "init", "");
/* Askfirst shell on tty1-4 */
new_init_action(ASKFIRST, bb_default_login_shell, "");
+//TODO: VC_1 instead of ""? "" is console -> ctty problems -> angry users
new_init_action(ASKFIRST, bb_default_login_shell, VC_2);
new_init_action(ASKFIRST, bb_default_login_shell, VC_3);
new_init_action(ASKFIRST, bb_default_login_shell, VC_4);
/* sysinit */
new_init_action(SYSINIT, INIT_SCRIPT, "");
-
return;
}
+ /* optional_tty:ignored_runlevel:action:command
+ * Delims are not to be collapsed and need exactly 4 tokens
+ */
+ while (config_read(parser, token, 4, 0, "#:",
+ PARSE_NORMAL & ~(PARSE_TRIM | PARSE_COLLAPSE))) {
+ int action;
+ char *tty = token[0];
- while (fgets(buf, INIT_BUFFS_SIZE, file) != NULL) {
- static const char actions[] =
- STR_SYSINIT "sysinit\0"
- STR_RESPAWN "respawn\0"
- STR_ASKFIRST "askfirst\0"
- STR_WAIT "wait\0"
- STR_ONCE "once\0"
- STR_CTRLALTDEL "ctrlaltdel\0"
- STR_SHUTDOWN "shutdown\0"
- STR_RESTART "restart\0"
- ;
- char tmpConsole[CONSOLE_NAME_SIZE];
- char *id, *runlev, *action, *command;
- const char *a;
-
- /* Skip leading spaces */
- id = skip_whitespace(buf);
- /* Trim the trailing '\n' */
- *strchrnul(id, '\n') = '\0';
- /* Skip the line if it is a comment */
- if (*id == '#' || *id == '\0')
- continue;
-
- /* Line is: "id:runlevel_ignored:action:command" */
- runlev = strchr(id, ':');
- if (runlev == NULL /*|| runlev[1] == '\0' - not needed */)
- goto bad_entry;
- action = strchr(runlev + 1, ':');
- if (action == NULL /*|| action[1] == '\0' - not needed */)
+ if (!token[3]) /* less than 4 tokens */
goto bad_entry;
- command = strchr(action + 1, ':');
- if (command == NULL || command[1] == '\0')
+ action = index_in_strings(actions, token[2]);
+ if (action < 0 || !token[3][0]) /* token[3]: command */
goto bad_entry;
-
- *command = '\0'; /* action => ":action\0" now */
- for (a = actions; a[0]; a += strlen(a) + 1) {
- if (strcmp(a + 1, action + 1) == 0) {
- *runlev = '\0';
- if (*id != '\0') {
- if (strncmp(id, "/dev/", 5) == 0)
- id += 5;
- strcpy(tmpConsole, "/dev/");
- safe_strncpy(tmpConsole + 5, id,
- sizeof(tmpConsole) - 5);
- id = tmpConsole;
- }
- new_init_action((uint8_t)a[0], command + 1, id);
- goto next_line;
- }
+ /* turn .*TTY -> /dev/TTY */
+ if (tty[0]) {
+ if (strncmp(tty, "/dev/", 5) == 0)
+ tty += 5;
+ tty = concat_path_file("/dev/", tty);
}
- *command = ':';
- /* Choke on an unknown action */
+ new_init_action(1 << action, token[3], tty);
+ if (tty[0])
+ free(tty);
+ continue;
bad_entry:
- message(L_LOG | L_CONSOLE, "Bad inittab entry: %s", id);
- next_line: ;
+ message(L_LOG | L_CONSOLE, "Bad inittab entry at line %d",
+ parser->lineno);
}
- fclose(file);
+ config_close(parser);
}
-static void reload_signal(int sig ATTRIBUTE_UNUSED)
+#if ENABLE_FEATURE_USE_INITTAB
+static void reload_signal(int sig UNUSED_PARAM)
{
struct init_action *a, *tmp;
/* disable old entrys */
for (a = init_action_list; a; a = a->next) {
- a->action = ONCE;
+ a->action_type = ONCE;
}
parse_inittab();
/* Be nice and send SIGTERM first */
for (a = init_action_list; a; a = a->next) {
pid_t pid = a->pid;
- if ((a->action & ONCE) && pid != 0) {
+ if ((a->action_type & ONCE) && pid != 0) {
kill(pid, SIGTERM);
}
}
#if CONFIG_FEATURE_KILL_DELAY
- if (fork() == 0) { /* child */
+ /* NB: parent will wait in NOMMU case */
+ if ((BB_MMU ? fork() : vfork()) == 0) { /* child */
sleep(CONFIG_FEATURE_KILL_DELAY);
for (a = init_action_list; a; a = a->next) {
pid_t pid = a->pid;
- if ((a->action & ONCE) && pid != 0) {
+ if ((a->action_type & ONCE) && pid != 0) {
kill(pid, SIGKILL);
}
}
- _exit(0);
+ _exit(EXIT_SUCCESS);
}
#endif
}
/* remove unused entrys */
for (a = init_action_list; a; a = tmp) {
tmp = a->next;
- if ((a->action & (ONCE | SYSINIT | WAIT)) && a->pid == 0) {
+ if ((a->action_type & (ONCE | SYSINIT | WAIT)) && a->pid == 0) {
delete_init_action(a);
}
}
- run_actions(RESPAWN);
+ run_actions(RESPAWN | ASKFIRST);
}
+#endif
int init_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int init_main(int argc, char **argv)
+int init_main(int argc UNUSED_PARAM, char **argv)
{
struct init_action *a;
pid_t wpid;
die_sleep = 30 * 24*60*60; /* if xmalloc will ever die... */
- if (argc > 1 && !strcmp(argv[1], "-q")) {
+ if (argv[1] && !strcmp(argv[1], "-q")) {
return kill(1, SIGHUP);
}
- if (!ENABLE_DEBUG_INIT) {
+ if (!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"))
}
/* Set up sig handlers -- be sure to
* clear all of these in run() */
- bb_signals(0
- + (1 << SIGHUP)
- + (1 << SIGQUIT)
- , exec_restart_action);
+ signal(SIGQUIT, exec_restart_action);
bb_signals(0
+ (1 << SIGUSR1) /* halt */
+ (1 << SIGUSR2) /* poweroff */
/* Figure out where the default console should be */
console_init();
set_sane_term();
- chdir("/");
+ xchdir("/");
setsid();
- {
- const char *const *e;
- /* Make sure environs is set to something sane */
- for (e = environment; *e; e++)
- putenv((char *) *e);
- }
- if (argc > 1) setenv("RUNLEVEL", argv[1], 1);
+ /* Make sure environs is set to something sane */
+ putenv((char *) "HOME=/");
+ putenv((char *) bb_PATH_root_path);
+ putenv((char *) "SHELL=/bin/sh");
+ putenv((char *) "USER=root"); /* needed? why? */
+
+ if (argv[1])
+ xsetenv("RUNLEVEL", argv[1]);
/* Hello world */
message(MAYBE_CONSOLE | L_LOG, "init started: %s", bb_banner);
}
/* Check if we are supposed to be in single user mode */
- if (argc > 1
+ if (argv[1]
&& (!strcmp(argv[1], "single") || !strcmp(argv[1], "-s") || LONE_CHAR(argv[1], '1'))
) {
+ /* ??? shouldn't we set RUNLEVEL="b" here? */
/* Start a shell on console */
new_init_action(RESPAWN, bb_default_login_shell, "");
} else {
BB_EXECVP(argv[0], argv);
} else if (enforce > 0) {
/* SELinux in enforcing mode but load_policy failed */
- message(L_CONSOLE, "Cannot load SELinux Policy. "
+ message(L_CONSOLE, "cannot load SELinux Policy. "
"Machine is in enforcing mode. Halting now.");
- exit(1);
+ exit(EXIT_FAILURE);
}
}
#endif /* CONFIG_SELINUX */
run_actions(ONCE);
/* Redefine SIGHUP to reread /etc/inittab */
- if (ENABLE_FEATURE_USE_INITTAB)
- signal(SIGHUP, reload_signal);
- else
- signal(SIGHUP, SIG_IGN);
+#if ENABLE_FEATURE_USE_INITTAB
+ signal(SIGHUP, reload_signal);
+#else
+ signal(SIGHUP, SIG_IGN);
+#endif
/* Now run the looping stuff for the rest of forever */
while (1) {
- /* run the respawn stuff */
- run_actions(RESPAWN);
-
- /* run the askfirst stuff */
- run_actions(ASKFIRST);
+ /* run the respawn/askfirst stuff */
+ run_actions(RESPAWN | ASKFIRST);
/* Don't consume all CPU time -- sleep a bit */
sleep(1);
* restarted by run_actions() */
a->pid = 0;
message(L_LOG, "process '%s' (pid %d) exited. "
- "Scheduling it for restart.",
+ "Scheduling for restart.",
a->command, wpid);
}
}
projects / oweals / busybox.git / blobdiff