*/
#include "libbb.h"
+#include <syslog.h>
#include <paths.h>
-//#include <signal.h>
-//#include <sys/ioctl.h>
-//#include <sys/wait.h>
#include <sys/reboot.h>
-#if ENABLE_FEATURE_INIT_SYSLOG
-# include <sys/syslog.h>
-#endif
-
-#define INIT_BUFFS_SIZE 256
+#define COMMAND_SIZE 256
#define CONSOLE_NAME_SIZE 32
#define MAXENV 16 /* Number of env. vars */
-#ifndef _PATH_STDPATH
-#define _PATH_STDPATH "/usr/bin:/bin:/usr/sbin:/sbin"
-#endif
-
-#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.
*/
#define CORE_ENABLE_FLAG_FILE "/.init_enable_core"
#include <sys/resource.h>
-#endif
#define INITTAB "/etc/inittab" /* inittab file location */
#ifndef INIT_SCRIPT
#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
-
-/* A mapping between "inittab" action name strings and action type codes. */
-struct init_action_type {
- const char *name;
- int action;
-};
-
-static const struct init_action_type actions[] = {
- {"sysinit", SYSINIT},
- {"respawn", RESPAWN},
- {"askfirst", ASKFIRST},
- {"wait", WAIT},
- {"once", ONCE},
- {"ctrlaltdel", CTRLALTDEL},
- {"shutdown", SHUTDOWN},
- {"restart", RESTART},
- {0, 0}
-};
+#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;
- int action;
pid_t pid;
- char command[INIT_BUFFS_SIZE];
+ uint8_t action_type;
char terminal[CONSOLE_NAME_SIZE];
+ char command[COMMAND_SIZE];
};
/* 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,
#endif
};
-static const char * const environment[] = {
+static const char *const environment[] = {
"HOME=/",
- "PATH=" _PATH_STDPATH,
+ bb_PATH_root_path,
"SHELL=/bin/sh",
"USER=root",
NULL
};
/* Function prototypes */
-static void delete_init_action(struct init_action *a);
-static int waitfor(const struct init_action *a, pid_t pid);
-#if !ENABLE_DEBUG_INIT
-static void shutdown_signal(int sig);
-#endif
+static void halt_reboot_pwoff(int sig) NORETURN;
+
+static void waitfor(pid_t pid)
+{
+ /* waitfor(run(x)): protect against failed fork inside run() */
+ if (pid <= 0)
+ return;
+
+ /* Wait for any child (prevent zombies from exiting orphaned processes)
+ * but exit the loop only when specified one has exited. */
+ while (wait(NULL) != pid)
+ continue;
+}
-#if !ENABLE_DEBUG_INIT
+static void loop_forever(void) NORETURN;
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
-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 (ENABLE_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, ...)
{
-#if !ENABLE_FEATURE_INIT_SYSLOG
static int log_fd = -1;
-#endif
-
va_list arguments;
int l;
char msg[128];
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 (where & L_LOG) {
+ /* don't print 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 = STDERR_FILENO;
} else {
- fcntl(log_fd, F_SETFD, FD_CLOEXEC);
+ 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);
+ where = L_CONSOLE;
+ } else {
+ close_on_exec_on(log_fd);
+ }
}
}
+ if (where & L_LOG) {
+ full_write(log_fd, msg, l);
+ if (log_fd == STDERR_FILENO)
+ 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) {
+ 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);
}
}
-/* Set terminal settings to reasonable defaults */
-static void set_sane_term(void)
-{
- struct termios tty;
-
- tcgetattr(STDIN_FILENO, &tty);
-
- /* set control chars */
- tty.c_cc[VINTR] = 3; /* C-c */
- tty.c_cc[VQUIT] = 28; /* C-\ */
- tty.c_cc[VERASE] = 127; /* C-? */
- tty.c_cc[VKILL] = 21; /* C-u */
- tty.c_cc[VEOF] = 4; /* C-d */
- tty.c_cc[VSTART] = 17; /* C-q */
- tty.c_cc[VSTOP] = 19; /* C-s */
- tty.c_cc[VSUSP] = 26; /* C-z */
-
- /* use line dicipline 0 */
- tty.c_line = 0;
-
- /* Make it be sane */
- tty.c_cflag &= CBAUD | CBAUDEX | CSIZE | CSTOPB | PARENB | PARODD;
- tty.c_cflag |= CREAD | HUPCL | CLOCAL;
-
- /* input modes */
- tty.c_iflag = ICRNL | IXON | IXOFF;
-
- /* output modes */
- tty.c_oflag = OPOST | ONLCR;
-
- /* local modes */
- tty.c_lflag =
- ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
-
- tcsetattr(STDIN_FILENO, TCSANOW, &tty);
-}
-
/* From <linux/serial.h> */
struct serial_struct {
int type;
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
+ * (so that they won't be used by future opens) */
+ bb_sanitize_stdio();
}
s = getenv("TERM");
- if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
- /* Force the TERM setting to vt102 for serial console --
+ 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=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");
}
-static void fixup_argv(int argc, char **argv, const char *new_argv0)
+/* Set terminal settings to reasonable defaults.
+ * NB: careful, we can be called after vfork! */
+static void set_sane_term(void)
{
- int len;
+ struct termios tty;
- /* Fix up argv[0] to be certain we claim to be init */
- len = strlen(argv[0]);
- strncpy(argv[0], new_argv0, len);
+ tcgetattr(STDIN_FILENO, &tty);
- /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
- len = 1;
- while (argc > len) {
- memset(argv[len], 0, strlen(argv[len]));
- len++;
- }
+ /* set control chars */
+ tty.c_cc[VINTR] = 3; /* C-c */
+ tty.c_cc[VQUIT] = 28; /* C-\ */
+ tty.c_cc[VERASE] = 127; /* C-? */
+ tty.c_cc[VKILL] = 21; /* C-u */
+ tty.c_cc[VEOF] = 4; /* C-d */
+ tty.c_cc[VSTART] = 17; /* C-q */
+ tty.c_cc[VSTOP] = 19; /* C-s */
+ tty.c_cc[VSUSP] = 26; /* C-z */
+
+ /* use line discipline 0 */
+ tty.c_line = 0;
+
+ /* Make it be sane */
+ tty.c_cflag &= CBAUD | CBAUDEX | CSIZE | CSTOPB | PARENB | PARODD;
+ tty.c_cflag |= CREAD | HUPCL | CLOCAL;
+
+ /* input modes */
+ tty.c_iflag = ICRNL | IXON | IXOFF;
+
+ /* output modes */
+ tty.c_oflag = OPOST | ONLCR;
+
+ /* local modes */
+ tty.c_lflag =
+ ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
+
+ tcsetattr(STDIN_FILENO, TCSANOW, &tty);
}
-/* Open the new terminal device */
-static void open_stdio_to_tty(const char* tty_name, int fail)
+/* 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 = device_open(tty_name, O_RDWR);
- if (fd < 0) {
+ int fd;
+ 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",
tty_name, strerror(errno));
- if (fail)
- _exit(1);
-#if !ENABLE_DEBUG_INIT
- shutdown_signal(SIGUSR1);
-#else
- _exit(2);
-#endif
- } else {
- dup2(fd, 0);
- dup2(fd, 1);
- dup2(fd, 2);
- if (fd > 2) close(fd);
+ if (exit_on_failure)
+ _exit(EXIT_FAILURE);
+ if (ENABLE_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(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. */
+ /* 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");
if (pid)
return pid;
+ /* Child */
+
/* Reset signal handlers that were set by the parent process */
- signal(SIGUSR1, SIG_DFL);
- signal(SIGUSR2, SIG_DFL);
- signal(SIGINT, SIG_DFL);
- signal(SIGTERM, SIG_DFL);
- signal(SIGHUP, SIG_DFL);
- signal(SIGQUIT, SIG_DFL);
- signal(SIGCONT, SIG_DFL);
- signal(SIGSTOP, SIG_DFL);
- signal(SIGTSTP, SIG_DFL);
+ bb_signals(0
+ + (1 << SIGUSR1)
+ + (1 << SIGUSR2)
+ + (1 << SIGINT)
+ + (1 << SIGTERM)
+ + (1 << SIGHUP)
+ + (1 << SIGQUIT)
+ + (1 << SIGCONT)
+ + (1 << SIGSTOP)
+ + (1 << SIGTSTP)
+ , SIG_DFL);
/* Create a new session and make ourself the process
* group leader */
setsid();
/* Open the new terminal device */
- open_stdio_to_tty(a->terminal, 1);
+ 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 */
- if ((pid = fork()) < 0) {
+ pid = fork();
+ if (pid < 0) {
message(L_LOG | L_CONSOLE, "Can't fork");
- _exit(1);
+ _exit(EXIT_FAILURE);
}
if (pid > 0) {
-
- /* We are the parent -- wait till the child is done */
- signal(SIGINT, SIG_IGN);
- signal(SIGTSTP, SIG_IGN);
- signal(SIGQUIT, SIG_IGN);
+ /* Parent - wait till the child is done */
+ bb_signals(0
+ + (1 << SIGINT)
+ + (1 << SIGTSTP)
+ + (1 << SIGQUIT)
+ , SIG_IGN);
signal(SIGCHLD, SIG_DFL);
- waitfor(NULL, pid);
+ 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. */
- if ((pid = fork()) < 0) {
+ pid = fork();
+ if (pid < 0) {
message(L_LOG | L_CONSOLE, "Can't fork");
- _exit(1);
+ _exit(EXIT_FAILURE);
}
if (pid == 0) {
setsid();
ioctl(0, TIOCSCTTY, 1);
- _exit(0);
- }
- waitfor(NULL, pid);
- _exit(0);
- }
-
- /* Now fall though to actually execute things */
- }
-
- /* 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++;
+ _exit(EXIT_SUCCESS);
}
+ waitfor(pid);
+ _exit(EXIT_SUCCESS);
}
- cmd[i] = NULL;
+ /* Child - fall though to actually execute things */
}
-
- 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;
-
- /* find the last component in the command pathname */
- s = bb_get_last_path_component(cmdpath);
-
- /* make a new argv[0] */
- if ((cmd[0] = malloc(strlen(s) + 2)) == 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 the tty (if any) a controlling tty.
- */
- setsid();
- ioctl(0, TIOCSCTTY, 0 /*don't steal it*/);
#endif
- }
-#if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__)
- if (a->action & ASKFIRST) {
- static const char press_enter[] =
+ /* 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
#endif
*/
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 (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;
}
-#endif
- /* Log the process name and args */
- 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;
-
limit.rlim_cur = RLIM_INFINITY;
limit.rlim_max = RLIM_INFINITY;
setrlimit(RLIMIT_CORE, &limit);
}
}
-#endif
+
+ /* 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 int waitfor(const struct init_action *a, pid_t pid)
+static void delete_init_action(struct init_action *action)
{
- int runpid;
- int status, wpid;
+ struct init_action *a, *b = NULL;
- runpid = (NULL == a)? pid : run(a);
- while (1) {
- wpid = waitpid(runpid, &status, 0);
- if (wpid == runpid)
- break;
- if (wpid == -1 && errno == ECHILD) {
- /* we missed its termination */
+ 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;
}
- /* FIXME other errors should maybe trigger an error, but allow
- * the program to continue */
}
- return wpid;
}
/* 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) {
- /* a->terminal of "" means "init's console" */
- if (a->terminal[0] && access(a->terminal, R_OK | W_OK)) {
- delete_init_action(a);
- } else if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
- waitfor(a, 0);
+ 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_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) {
}
}
-#if !ENABLE_DEBUG_INIT
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);
}
- waitpid(pid, NULL, 0);
+ waitfor(pid);
}
-static void shutdown_system(void)
+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 */
- 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!");
sleep(1);
}
-static void exec_signal(int sig ATTRIBUTE_UNUSED)
-{
- struct init_action *a, *tmp;
- sigset_t unblock_signals;
-
- for (a = init_action_list; a; a = tmp) {
- tmp = a->next;
- if (a->action & RESTART) {
- shutdown_system();
-
- /* unblock all signals, blocked in shutdown_system() */
- 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);
-
- /* Open the new terminal device */
- open_stdio_to_tty(a->terminal, 0);
-
- 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));
- sleep(2);
- init_reboot(RB_HALT_SYSTEM);
- loop_forever();
- }
- }
-}
-
-static void shutdown_signal(int sig)
+static void halt_reboot_pwoff(int sig)
{
- const char *m;
+ const char *m = "halt";
int rb;
- shutdown_system();
+ kill_all_processes();
- m = "halt";
rb = RB_HALT_SYSTEM;
if (sig == SIGTERM) {
m = "reboot";
loop_forever();
}
-static void ctrlaltdel_signal(int sig ATTRIBUTE_UNUSED)
+/* Handler for QUIT - exec "restart" action,
+ * else (no such action defined) do nothing */
+static void exec_restart_action(int sig UNUSED_PARAM)
+{
+ struct init_action *a;
+
+ 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()) */
+ 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);
+ init_exec(a->command);
+ sleep(2);
+ init_reboot(RB_HALT_SYSTEM);
+ loop_forever();
+ }
+ }
+}
+
+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;
got_cont = 0;
while (!got_cont)
pause();
- got_cont = 0;
+
errno = saved_errno;
}
/* The SIGCONT handler */
-static void cont_handler(int sig ATTRIBUTE_UNUSED)
+static void cont_handler(int sig UNUSED_PARAM)
{
got_cont = 1;
}
-#endif /* !ENABLE_DEBUG_INIT */
-
-static void new_init_action(int 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) {
/* don't enter action if it's already in the list,
* but do overwrite existing actions */
if ((strcmp(a->command, command) == 0)
- && (strcmp(a->terminal, cons) == 0)
- ) {
- a->action = action;
+ && (strcmp(a->terminal, cons) == 0)) {
+ 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)
{
-#if ENABLE_FEATURE_USE_INITTAB
- FILE *file;
- char buf[INIT_BUFFS_SIZE], lineAsRead[INIT_BUFFS_SIZE];
- char tmpConsole[CONSOLE_NAME_SIZE];
- char *id, *runlev, *action, *command, *eol;
- const struct init_action_type *a = actions;
-
- file = fopen(INITTAB, "r");
- if (file == NULL) {
- /* No inittab file -- set up some default behavior */
-#endif
+ 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_open(INITTAB);
+ /* No inittab file -- set up some default behavior */
+ if (parser == NULL) {
/* Reboot on Ctrl-Alt-Del */
new_init_action(CTRLALTDEL, "reboot", "");
/* Umount all filesystems on halt/reboot */
new_init_action(SHUTDOWN, "umount -a -r", "");
/* Swapoff on halt/reboot */
- if (ENABLE_SWAPONOFF) new_init_action(SHUTDOWN, "swapoff -a", "");
- /* Prepare to restart init when a HUP is received */
+ if (ENABLE_SWAPONOFF)
+ new_init_action(SHUTDOWN, "swapoff -a", "");
+ /* 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);
new_init_action(SYSINIT, INIT_SCRIPT, "");
return;
-#if ENABLE_FEATURE_USE_INITTAB
}
-
- while (fgets(buf, INIT_BUFFS_SIZE, file) != NULL) {
- /* Skip leading spaces */
- for (id = buf; *id == ' ' || *id == '\t'; id++);
-
- /* Skip the line if it's a comment */
- if (*id == '#' || *id == '\n')
- continue;
-
- /* Trim the trailing \n */
- //XXX: chomp() ?
- eol = strrchr(id, '\n');
- if (eol != NULL)
- *eol = '\0';
-
- /* Keep a copy around for posterity's sake (and error msgs) */
- strcpy(lineAsRead, buf);
-
- /* Separate the ID field from the runlevels */
- runlev = strchr(id, ':');
- if (runlev == NULL || *(runlev + 1) == '\0') {
- message(L_LOG | L_CONSOLE, "Bad inittab entry: %s", lineAsRead);
- continue;
- } else {
- *runlev = '\0';
- ++runlev;
- }
-
- /* Separate the runlevels from the action */
- action = strchr(runlev, ':');
- if (action == NULL || *(action + 1) == '\0') {
- message(L_LOG | L_CONSOLE, "Bad inittab entry: %s", lineAsRead);
- continue;
- } else {
- *action = '\0';
- ++action;
- }
-
- /* Separate the action from the command */
- command = strchr(action, ':');
- if (command == NULL || *(command + 1) == '\0') {
- message(L_LOG | L_CONSOLE, "Bad inittab entry: %s", lineAsRead);
- continue;
- } else {
- *command = '\0';
- ++command;
- }
-
- /* Ok, now process it */
- for (a = actions; a->name != 0; a++) {
- if (strcmp(a->name, action) == 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(a->action, command, id);
- break;
- }
- }
- if (a->name == 0) {
- /* Choke on an unknown action */
- message(L_LOG | L_CONSOLE, "Bad inittab entry: %s", lineAsRead);
+ /* 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_DONT_TRIM|PARSE_DONT_REDUCE|PARSE_LAST_IS_GREEDY)) {
+ int action;
+ char *tty = token[0];
+
+ if (!token[3]) /* less than 4 tokens */
+ goto bad_entry;
+ action = index_in_strings(actions, token[2]);
+ if (action < 0 || !token[3][0]) /* token[3]: command */
+ goto bad_entry;
+ /* turn .*TTY -> /dev/TTY */
+ if (tty[0]) {
+ if (strncmp(tty, "/dev/", 5) == 0)
+ tty += 5;
+ tty = concat_path_file("/dev/", tty);
}
+ new_init_action(1 << action, token[3], tty);
+ if (tty[0])
+ free(tty);
+ continue;
+ bad_entry:
+ message(L_LOG | L_CONSOLE, "Bad inittab entry at line %d",
+ parser->lineno);
}
- fclose(file);
-#endif /* FEATURE_USE_INITTAB */
+ config_close(parser);
}
#if ENABLE_FEATURE_USE_INITTAB
-static void reload_signal(int sig ATTRIBUTE_UNUSED)
+static void reload_signal(int sig UNUSED_PARAM)
{
struct init_action *a, *tmp;
message(L_LOG, "reloading /etc/inittab");
/* disable old entrys */
- for (a = init_action_list; a; a = a->next ) {
- a->action = ONCE;
+ for (a = init_action_list; a; a = a->next) {
+ a->action_type = ONCE;
}
parse_inittab();
+ if (ENABLE_FEATURE_KILL_REMOVED) {
+ /* Be nice and send SIGTERM first */
+ for (a = init_action_list; a; a = a->next) {
+ pid_t pid = a->pid;
+ if ((a->action_type & ONCE) && pid != 0) {
+ kill(pid, SIGTERM);
+ }
+ }
+#if CONFIG_FEATURE_KILL_DELAY
+ /* 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_type & ONCE) && pid != 0) {
+ kill(pid, SIGKILL);
+ }
+ }
+ _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 /* FEATURE_USE_INITTAB */
+#endif
-int init_main(int argc, char **argv);
-int init_main(int argc, char **argv)
+int init_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+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
- /* 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();
+
+ 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(SIGQUIT, exec_restart_action);
+ bb_signals(0
+ + (1 << SIGUSR1) /* halt */
+ + (1 << SIGUSR2) /* poweroff */
+ + (1 << SIGTERM) /* reboot */
+ , halt_reboot_pwoff);
+ signal(SIGINT, ctrlaltdel_signal);
+ signal(SIGCONT, cont_handler);
+ bb_signals(0
+ + (1 << SIGSTOP)
+ + (1 << 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);
}
- /* 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
/* Figure out where the default console should be */
console_init();
set_sane_term();
- chdir("/");
+ xchdir("/");
setsid();
{
- const char * const *e;
+ 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);
+ if (argv[1])
+ setenv("RUNLEVEL", argv[1], 1);
/* Hello world */
- message(MAYBE_CONSOLE | L_LOG, "init started: %s", bb_msg_full_version);
+ message(MAYBE_CONSOLE | L_LOG, "init started: %s", bb_banner);
/* Make sure there is enough memory to do something useful. */
if (ENABLE_SWAPONOFF) {
}
/* 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 {
if (getenv("SELINUX_INIT") == NULL) {
int enforce = 0;
- putenv("SELINUX_INIT=YES");
+ putenv((char*)"SELINUX_INIT=YES");
if (selinux_init_load_policy(&enforce) == 0) {
BB_EXECVP(argv[0], argv);
} else if (enforce > 0) {
/* SELinux in enforcing mode but load_policy failed */
- /* At this point, we probably can't open /dev/console, so log() won't work */
message(L_CONSOLE, "Cannot load SELinux Policy. "
"Machine is in enforcing mode. Halting now.");
- exit(1);
+ exit(EXIT_FAILURE);
}
}
#endif /* CONFIG_SELINUX */
- /* Make the command line just say "init" -- thats all, nothing else */
- fixup_argv(argc, argv, "init");
+ /* Make the command line just say "init" - thats all, nothing else */
+ strncpy(argv[0], "init", strlen(argv[0]));
+ /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
+ while (*++argv)
+ memset(*argv, 0, strlen(*argv));
/* Now run everything that needs to be run */
/* Next run anything to be run only once */
run_actions(ONCE);
-#if ENABLE_FEATURE_USE_INITTAB
/* Redefine SIGHUP to reread /etc/inittab */
+#if ENABLE_FEATURE_USE_INITTAB
signal(SIGHUP, reload_signal);
#else
signal(SIGHUP, SIG_IGN);
-#endif /* FEATURE_USE_INITTAB */
+#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);
- /* Wait for a child process to exit */
+ /* Wait for any child process to exit */
wpid = wait(NULL);
while (wpid > 0) {
/* Find out who died and clean up their corpse */
* 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);
}
}
/* see if anyone else is waiting to be reaped */
- wpid = waitpid(-1, NULL, WNOHANG);
+ wpid = wait_any_nohang(NULL);
}
}
}
projects / oweals / busybox.git / blobdiff