* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
-/* Turn this on to disable all the dangerous
- rebooting stuff when debugging.
-#define DEBUG_INIT
-*/
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <errno.h>
+#include "libbb.h"
#include <paths.h>
-#include <signal.h>
-#include <stdarg.h>
-#include <string.h>
-#include <termios.h>
-#include <unistd.h>
-#include <limits.h>
-#include <fcntl.h>
-#include <sys/ioctl.h>
-#include <sys/types.h>
-#include <sys/wait.h>
#include <sys/reboot.h>
-#include "busybox.h"
-
-#include "init_shared.h"
-
-
-#ifdef CONFIG_SYSLOGD
-# include <sys/syslog.h>
-#endif
-
-
-#ifdef CONFIG_SELINUX
-# include <selinux/selinux.h>
-#endif /* CONFIG_SELINUX */
-
+#include <sys/syslog.h>
#define INIT_BUFFS_SIZE 256
+#define CONSOLE_NAME_SIZE 32
+#define MAXENV 16 /* Number of env. vars */
-/* From <linux/vt.h> */
-struct vt_stat {
- unsigned short v_active; /* active vt */
- unsigned short v_signal; /* signal to send */
- unsigned short v_state; /* vt bitmask */
-};
-enum { VT_GETSTATE = 0x5603 }; /* get global vt state info */
-
-/* From <linux/serial.h> */
-struct serial_struct {
- int type;
- int line;
- unsigned int port;
- int irq;
- int flags;
- int xmit_fifo_size;
- int custom_divisor;
- int baud_base;
- unsigned short close_delay;
- char io_type;
- char reserved_char[1];
- int hub6;
- unsigned short closing_wait; /* time to wait before closing */
- unsigned short closing_wait2; /* no longer used... */
- unsigned char *iomem_base;
- unsigned short iomem_reg_shift;
- unsigned int port_high;
- unsigned long iomap_base; /* cookie passed into ioremap */
- int reserved[1];
-};
-
-
-#ifndef _PATH_STDPATH
-#define _PATH_STDPATH "/usr/bin:/bin:/usr/sbin:/sbin"
-#endif
-
-#if defined CONFIG_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 KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
#define INITTAB "/etc/inittab" /* inittab file location */
#ifndef INIT_SCRIPT
#define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
#endif
-#define MAXENV 16 /* Number of env. vars */
-
-#define CONSOLE_BUFF_SIZE 32
-
/* Allowed init action types */
#define SYSINIT 0x001
#define RESPAWN 0x002
#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 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"
/* 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;
+ char terminal[CONSOLE_NAME_SIZE];
char command[INIT_BUFFS_SIZE];
- char terminal[CONSOLE_BUFF_SIZE];
- struct init_action *next;
- int action;
};
/* Static variables */
static struct init_action *init_action_list = NULL;
-static char console[CONSOLE_BUFF_SIZE] = _PATH_CONSOLE;
-#ifndef CONFIG_SYSLOGD
-static char *log_console = VC_5;
-#endif
+static const char *log_console = VC_5;
static sig_atomic_t got_cont = 0;
enum {
- LOG = 0x1,
- CONSOLE = 0x2,
+ L_LOG = 0x1,
+ L_CONSOLE = 0x2,
-#if defined CONFIG_FEATURE_EXTRA_QUIET
+#if ENABLE_FEATURE_EXTRA_QUIET
MAYBE_CONSOLE = 0x0,
#else
- MAYBE_CONSOLE = CONSOLE,
+ MAYBE_CONSOLE = L_CONSOLE,
#endif
#ifndef RB_HALT_SYSTEM
- RB_HALT_SYSTEM = 0xcdef0123,
+ RB_HALT_SYSTEM = 0xcdef0123, /* FIXME: this overflows enum */
RB_ENABLE_CAD = 0x89abcdef,
RB_DISABLE_CAD = 0,
RB_POWER_OFF = 0x4321fedc,
#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);
-static void halt_signal(int sig);
+static void halt_reboot_pwoff(int sig) ATTRIBUTE_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;
+}
+
+static void loop_forever(void) ATTRIBUTE_NORETURN;
static void loop_forever(void)
{
while (1)
}
/* Print a message to the specified device.
- * Device may be bitwise-or'd from LOG | CONSOLE */
-#ifndef DEBUG_INIT
-static inline void messageD(int ATTRIBUTE_UNUSED device,
- const char ATTRIBUTE_UNUSED *fmt, ...)
-{
-}
-#else
-#define messageD message
-#endif
+ * 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, ...)
__attribute__ ((format(printf, 2, 3)));
static void message(int device, const char *fmt, ...)
{
+ static int log_fd = -1;
va_list arguments;
int l;
- char msg[1024];
-#ifndef CONFIG_SYSLOGD
- static int log_fd = -1;
-#endif
+ char msg[128];
msg[0] = '\r';
- va_start(arguments, fmt);
- l = vsnprintf(msg + 1, sizeof(msg) - 2, fmt, arguments) + 1;
- va_end(arguments);
-
-#ifdef CONFIG_SYSLOGD
- /* Log the message to syslogd */
- if (device & LOG) {
- /* don`t out "\r\n" */
- openlog(bb_applet_name, 0, LOG_DAEMON);
- syslog(LOG_INFO, "%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_fd = device_open(log_console, O_RDWR | O_NONBLOCK | O_NOCTTY)) < 0) {
- log_fd = -2;
- bb_error_msg("Bummer, can't write to log on %s!", log_console);
- device = CONSOLE;
- } else {
- fcntl(log_fd, F_SETFD, FD_CLOEXEC);
+ va_start(arguments, fmt);
+ vsnprintf(msg + 1, sizeof(msg) - 2, fmt, arguments);
+ 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" */
+ 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;
+ } 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 & LOG) && (log_fd >= 0)) {
- bb_full_write(log_fd, msg, l);
+
+ if (device & L_CONSOLE) {
+ /* Send console messages to console so people will see them. */
+ full_write(2, msg, l);
}
-#endif
+}
+
+/* From <linux/serial.h> */
+struct serial_struct {
+ int type;
+ int line;
+ unsigned int port;
+ int irq;
+ int flags;
+ int xmit_fifo_size;
+ int custom_divisor;
+ int baud_base;
+ unsigned short close_delay;
+ char io_type;
+ char reserved_char[1];
+ int hub6;
+ unsigned short closing_wait; /* time to wait before closing */
+ unsigned short closing_wait2; /* no longer used... */
+ unsigned char *iomem_base;
+ unsigned short iomem_reg_shift;
+ unsigned int port_high;
+ unsigned long iomap_base; /* cookie passed into ioremap */
+ int reserved[1];
+ /* Paranoia (imagine 64bit kernel overwriting 32bit userspace stack) */
+ uint32_t bbox_reserved[16];
+};
+static void console_init(void)
+{
+ struct serial_struct sr;
+ char *s;
- if (device & CONSOLE) {
- int fd = device_open(_PATH_CONSOLE,
- O_WRONLY | O_NOCTTY | O_NONBLOCK);
- /* Always send console messages to /dev/console so people will see them. */
+ s = getenv("CONSOLE");
+ if (!s) s = getenv("console");
+ if (s) {
+ int fd = open(s, O_RDWR | O_NONBLOCK | O_NOCTTY);
if (fd >= 0) {
- bb_full_write(fd, msg, l);
- close(fd);
-#ifdef DEBUG_INIT
- /* all descriptors may be closed */
- } else {
- bb_error_msg("Bummer, can't print: ");
- va_start(arguments, fmt);
- vfprintf(stderr, fmt, arguments);
- va_end(arguments);
-#endif
+ dup2(fd, 0);
+ dup2(fd, 1);
+ dup2(fd, 2);
+ while (fd > 2) close(fd--);
}
+ messageD(L_LOG, "console='%s'", s);
+ } else {
+ /* Make sure fd 0,1,2 are not closed */
+ bb_sanitize_stdio();
}
+
+ s = getenv("TERM");
+ if (ioctl(0, 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;
+ } else if (!s)
+ putenv((char*)"TERM=linux");
}
/* Set terminal settings to reasonable defaults */
-static void set_term(int fd)
+static void set_sane_term(void)
{
struct termios tty;
- tcgetattr(fd, &tty);
+ tcgetattr(STDIN_FILENO, &tty);
/* set control chars */
tty.c_cc[VINTR] = 3; /* C-c */
tty.c_cflag &= CBAUD | CBAUDEX | CSIZE | CSTOPB | PARENB | PARODD;
tty.c_cflag |= CREAD | HUPCL | CLOCAL;
-
/* input modes */
tty.c_iflag = ICRNL | IXON | IXOFF;
tty.c_lflag =
ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
- tcsetattr(fd, TCSANOW, &tty);
-}
-
-static void console_init(void)
-{
- int fd;
- int tried = 0;
- struct vt_stat vt;
- struct serial_struct sr;
- char *s;
-
- if ((s = getenv("CONSOLE")) != NULL || (s = getenv("console")) != NULL) {
- safe_strncpy(console, s, sizeof(console));
-#if #cpu(sparc)
- /* sparc kernel supports console=tty[ab] parameter which is also
- * passed to init, so catch it here */
- /* remap tty[ab] to /dev/ttyS[01] */
- if (strcmp(s, "ttya") == 0)
- safe_strncpy(console, SC_0, sizeof(console));
- else if (strcmp(s, "ttyb") == 0)
- safe_strncpy(console, SC_1, sizeof(console));
-#endif
- } else {
- /* 2.2 kernels: identify the real console backend and try to use it */
- if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
- /* this is a serial console */
- snprintf(console, sizeof(console) - 1, SC_FORMAT, sr.line);
- } else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
- /* this is linux virtual tty */
- snprintf(console, sizeof(console) - 1, VC_FORMAT, vt.v_active);
- } else {
- safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
- tried++;
- }
- }
-
- while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0 && tried < 2) {
- /* Can't open selected console -- try
- logical system console and VT_MASTER */
- safe_strncpy(console, (tried == 0 ? _PATH_CONSOLE : CURRENT_VC),
- sizeof(console));
- tried++;
- }
- if (fd < 0) {
- /* Perhaps we should panic here? */
-#ifndef CONFIG_SYSLOGD
- log_console =
-#endif
- safe_strncpy(console, bb_dev_null, sizeof(console));
- } else {
- s = getenv("TERM");
- /* check for serial console */
- if (ioctl(fd, TIOCGSERIAL, &sr) == 0) {
- /* Force the TERM setting to vt102 for serial console --
- * if TERM is set to linux (the default) */
- if (s == NULL || strcmp(s, "linux") == 0)
- putenv("TERM=vt102");
-#ifndef CONFIG_SYSLOGD
- log_console = console;
-#endif
- } else {
- if (s == NULL)
- putenv("TERM=linux");
- }
- close(fd);
- }
- messageD(LOG, "console=%s", console);
-}
-
-static void fixup_argv(int argc, char **argv, char *new_argv0)
-{
- int len;
-
- /* Fix up argv[0] to be certain we claim to be init */
- len = strlen(argv[0]);
- memset(argv[0], 0, len);
- safe_strncpy(argv[0], new_argv0, len + 1);
-
- /* 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++;
- }
+ tcsetattr(STDIN_FILENO, TCSANOW, &tty);
}
/* Open the new terminal device */
-static void open_new_terminal(const char *device, char fail) {
- struct stat sb;
-
- if ((device_open(device, O_RDWR)) < 0) {
- if (stat(device, &sb) != 0) {
- message(LOG | CONSOLE, "device '%s' does not exist.", device);
- } else {
- message(LOG | CONSOLE, "Bummer, can't open %s", device);
+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);
+ /* 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 (exit_on_failure)
+ _exit(1);
+ if (ENABLE_DEBUG_INIT)
+ _exit(2);
+ halt_reboot_pwoff(SIGUSR1); /* halt the system */
}
- if (fail)
- _exit(1);
- /* else */
- halt_signal(SIGUSR1);
+ dup2(0, 1);
+ dup2(0, 2);
}
+ set_sane_term();
}
+/* Used only by run_actions */
static pid_t run(const struct init_action *a)
{
- int i, junk;
+ int i;
pid_t pid;
- char *s, *tmpCmd, *cmd[INIT_BUFFS_SIZE], *cmdpath;
+ 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;
- static const char press_enter[] =
-#ifdef CUSTOMIZED_BANNER
-#include CUSTOMIZED_BANNER
-#endif
- "\nPlease press Enter to activate this console. ";
- /* Block sigchild while forking. */
+ /* Block sigchild while forking (why?) */
sigemptyset(&nmask);
sigaddset(&nmask, SIGCHLD);
sigprocmask(SIG_BLOCK, &nmask, &omask);
+ pid = fork();
+ sigprocmask(SIG_SETMASK, &omask, NULL);
- if ((pid = fork()) == 0) {
-
- /* Clean up */
- close(0);
- close(1);
- close(2);
- sigprocmask(SIG_SETMASK, &omask, NULL);
-
- /* 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);
-
- /* Create a new session and make ourself the process
- * group leader */
- setsid();
-
- /* Open the new terminal device */
- open_new_terminal(a->terminal, 1);
-
- /* Make sure the terminal will act fairly normal for us */
- set_term(0);
- /* Setup stdout, stderr for the new process so
- * they point to the supplied terminal */
- dup(0);
- dup(0);
-
- /* 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)) {
- pid_t pgrp, tmp_pid;
-
- /* Now fork off another process to just hang around */
- if ((pid = fork()) < 0) {
- message(LOG | CONSOLE, "Can't fork!");
- _exit(1);
- }
-
- 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);
- signal(SIGCHLD, SIG_DFL);
+ 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);
+
+ /* Create a new session and make ourself the process
+ * group leader */
+ setsid();
- /* Wait for child to exit */
- while ((tmp_pid = waitpid(pid, &junk, 0)) != pid) {
- if (tmp_pid == -1 && errno == ECHILD) {
- break;
- }
- /* FIXME handle other errors */
- }
+ /* Open the new terminal device */
+ open_stdio_to_tty(a->terminal, 1 /* - exit if open fails*/);
+
+#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)) {
+ /* Now fork off another process to just hang around */
+ pid = fork();
+ if (pid < 0) {
+ message(L_LOG | L_CONSOLE, "Can't fork");
+ _exit(1);
+ }
- /* See if stealing the controlling tty back is necessary */
- pgrp = tcgetpgrp(0);
- if (pgrp != getpid())
- _exit(0);
+ if (pid > 0) {
+ /* Parent - wait till the child is done */
+ signal(SIGINT, SIG_IGN);
+ signal(SIGTSTP, SIG_IGN);
+ signal(SIGQUIT, SIG_IGN);
+ signal(SIGCHLD, SIG_DFL);
- /* Use a temporary process to steal the controlling tty. */
- if ((pid = fork()) < 0) {
- message(LOG | CONSOLE, "Can't fork!");
- _exit(1);
- }
- if (pid == 0) {
- setsid();
- ioctl(0, TIOCSCTTY, 1);
- _exit(0);
- }
- while ((tmp_pid = waitpid(pid, &junk, 0)) != pid) {
- if (tmp_pid < 0 && errno == ECHILD)
- break;
- }
+ waitfor(pid);
+ /* See if stealing the controlling tty back is necessary */
+ if (tcgetpgrp(0) != getpid())
_exit(0);
- }
- /* Now fall though to actually execute things */
- }
-
- /* See if any special /bin/sh requiring characters are present */
- if (strpbrk(a->command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
- cmd[0] = (char *)DEFAULT_SHELL;
- cmd[1] = "-c";
- cmd[2] = strcat(strcpy(buf, "exec "), a->command);
- cmd[3] = NULL;
- } else {
- /* Convert command (char*) into cmd (char**, one word per string) */
- strcpy(buf, a->command);
- s = buf;
- for (tmpCmd = buf, i = 0; (tmpCmd = strsep(&s, " \t")) != NULL;) {
- if (*tmpCmd != '\0') {
- cmd[i] = tmpCmd;
- i++;
- }
+ /* Use a temporary process to steal the controlling tty. */
+ pid = fork();
+ if (pid < 0) {
+ message(L_LOG | L_CONSOLE, "Can't fork");
+ _exit(1);
}
- cmd[i] = NULL;
+ if (pid == 0) {
+ setsid();
+ ioctl(0, TIOCSCTTY, 1);
+ _exit(0);
+ }
+ waitfor(pid);
+ _exit(0);
}
- cmdpath = cmd[0];
-
- /*
- Interactive shells want to see a dash in argv[0]. This
- typically is handled by login, argv will be setup this
- way if a dash appears at the front of the command path
- (like "-/bin/sh").
- */
-
- if (*cmdpath == '-') {
-
- /* skip over the dash */
- ++cmdpath;
-
- /* find the last component in the command pathname */
- s = bb_get_last_path_component(cmdpath);
+ /* Child - fall though to actually execute things */
+ }
+#endif
- /* make a new argv[0] */
- if ((cmd[0] = malloc(strlen(s) + 2)) == NULL) {
- message(LOG | CONSOLE, bb_msg_memory_exhausted);
- cmd[0] = cmdpath;
- } else {
- cmd[0][0] = '-';
- strcpy(cmd[0] + 1, s);
+ /* See if any special /bin/sh requiring characters are present */
+ if (strpbrk(a->command, "~`!$^&*()=|\\{}[];\"'<>?") != 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++;
}
-#ifdef CONFIG_FEATURE_INIT_SCTTY
- /* Establish this process as session leader and
- * (attempt) to make the tty (if any) a controlling tty.
- */
- (void) setsid();
- (void) ioctl(0, TIOCSCTTY, 0/*don't steal it*/);
-#endif
}
+ cmd[i] = NULL;
+ }
-#if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__)
- if (a->action & ASKFIRST) {
- char c;
- /*
- * Save memory by not exec-ing anything large (like a shell)
- * before the user wants it. This is critical if swap is not
- * enabled and the system has low memory. Generally this will
- * be run on the second virtual console, and the first will
- * be allowed to start a shell or whatever an init script
- * specifies.
- */
- messageD(LOG, "Waiting for enter to start '%s'"
- "(pid %d, terminal %s)\n",
- cmdpath, getpid(), a->terminal);
- bb_full_write(1, press_enter, sizeof(press_enter) - 1);
- while(read(0, &c, 1) == 1 && c != '\n')
- ;
+ 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
- /* Log the process name and args */
- message(LOG, "Starting pid %d, console %s: '%s'",
- getpid(), a->terminal, cmdpath);
-
-#if defined CONFIG_FEATURE_INIT_COREDUMPS
- {
- struct stat sb;
- if (stat(CORE_ENABLE_FLAG_FILE, &sb) == 0) {
- struct rlimit limit;
+ /* _Attempt_ to make stdin a controlling tty. */
+ if (ENABLE_FEATURE_INIT_SCTTY)
+ ioctl(0, TIOCSCTTY, 0 /*only try, don't steal*/);
+ }
- limit.rlim_cur = RLIM_INFINITY;
- limit.rlim_max = RLIM_INFINITY;
- setrlimit(RLIMIT_CORE, &limit);
- }
- }
+ if (a->action & ASKFIRST) {
+ static const char press_enter[] ALIGN1 =
+#ifdef CUSTOMIZED_BANNER
+#include CUSTOMIZED_BANNER
#endif
-
- /* Now run it. The new program will take over this PID,
- * so nothing further in init.c should be run. */
- execv(cmdpath, cmd);
-
- /* We're still here? Some error happened. */
- message(LOG | CONSOLE, "Bummer, could not run '%s': %m", cmdpath);
- _exit(-1);
+ "\nPlease press Enter to activate this console. ";
+ char c;
+ /*
+ * Save memory by not exec-ing anything large (like a shell)
+ * before the user wants it. This is critical if swap is not
+ * enabled and the system has low memory. Generally this will
+ * be run on the second virtual console, and the first will
+ * be allowed to start a shell or whatever an init script
+ * specifies.
+ */
+ 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')
+ continue;
}
- sigprocmask(SIG_SETMASK, &omask, NULL);
- return pid;
-}
-static int waitfor(const struct init_action *a)
-{
- int pid;
- int status, wpid;
+ /* Log the process name and args */
+ message(L_LOG, "starting pid %d, tty '%s': '%s'",
+ getpid(), a->terminal, cmdpath);
- pid = run(a);
- while (1) {
- wpid = waitpid(pid,&status,0);
- if (wpid == pid)
- break;
- if (wpid == -1 && errno == ECHILD) {
- /* we missed its termination */
- break;
+ 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);
}
- /* FIXME other errors should maybe trigger an error, but allow
- * the program to continue */
}
- return wpid;
+
+ /* Now run it. The new program will take over this PID,
+ * so nothing further in init.c should be run. */
+ BB_EXECVP(cmdpath, cmd);
+
+ /* We're still here? Some error happened. */
+ message(L_LOG | L_CONSOLE, "Cannot run '%s': %s",
+ cmdpath, strerror(errno));
+ _exit(-1);
}
/* Run all commands of a particular type */
for (a = init_action_list; a; a = tmp) {
tmp = a->next;
if (a->action == action) {
- if (access(a->terminal, R_OK | W_OK)) {
- delete_init_action(a);
- } else if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
- waitfor(a);
+ // 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)) {
+ waitfor(run(a));
delete_init_action(a);
} else if (a->action & ONCE) {
run(a);
}
}
-#ifndef 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
* linux/kernel/sys.c, which can cause the machine to panic when
* the init process is killed.... */
- if ((pid = fork()) == 0) {
+ pid = vfork();
+ if (pid == 0) { /* child */
reboot(magic);
_exit(0);
}
- waitpid (pid, NULL, 0);
+ waitfor(pid);
}
-static void shutdown_system(void)
+static void kill_all_processes(void)
{
sigset_t block_signals;
run_actions(SHUTDOWN);
/* first disable all our signals */
- sigemptyset(&block_signals);
+ sigfillset(&block_signals);
+ /*sigemptyset(&block_signals);
sigaddset(&block_signals, SIGHUP);
sigaddset(&block_signals, SIGQUIT);
sigaddset(&block_signals, SIGCHLD);
sigaddset(&block_signals, SIGTERM);
sigaddset(&block_signals, SIGCONT);
sigaddset(&block_signals, SIGSTOP);
- sigaddset(&block_signals, SIGTSTP);
+ sigaddset(&block_signals, SIGTSTP);*/
sigprocmask(SIG_BLOCK, &block_signals, NULL);
+ message(L_CONSOLE | L_LOG, "The system is going down NOW!");
+
/* Allow Ctrl-Alt-Del to reboot system. */
init_reboot(RB_ENABLE_CAD);
- message(CONSOLE | LOG, "The system is going down NOW !!");
- sync();
-
/* Send signals to every process _except_ pid 1 */
- message(CONSOLE | LOG, "Sending SIGTERM to all processes.");
+ message(L_CONSOLE | L_LOG, "Sending SIG%s to all processes", "TERM");
kill(-1, SIGTERM);
- sleep(1);
sync();
+ sleep(1);
- message(CONSOLE | LOG, "Sending SIGKILL to all processes.");
+ message(L_CONSOLE | L_LOG, "Sending SIG%s to all processes", "KILL");
kill(-1, SIGKILL);
+ sync();
sleep(1);
+}
- sync();
+static void halt_reboot_pwoff(int sig)
+{
+ const char *m;
+ int rb;
+
+ kill_all_processes();
+
+ m = "halt";
+ rb = RB_HALT_SYSTEM;
+ if (sig == SIGTERM) {
+ m = "reboot";
+ rb = RB_AUTOBOOT;
+ } else if (sig == SIGUSR2) {
+ m = "poweroff";
+ rb = RB_POWER_OFF;
+ }
+ message(L_CONSOLE | L_LOG, "Requesting system %s", m);
+ /* allow time for last message to reach serial console */
+ sleep(2);
+ init_reboot(rb);
+ loop_forever();
}
-static void exec_signal(int sig ATTRIBUTE_UNUSED)
+/* Handler for HUP and QUIT - exec "restart" action,
+ * else (no such action defined) do nothing */
+static void exec_restart_action(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();
+ kill_all_processes();
- /* unblock all signals, blocked in shutdown_system() */
- sigemptyset(&unblock_signals);
+ /* 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, SIGTERM);
sigaddset(&unblock_signals, SIGCONT);
sigaddset(&unblock_signals, SIGSTOP);
- sigaddset(&unblock_signals, SIGTSTP);
+ sigaddset(&unblock_signals, SIGTSTP);*/
sigprocmask(SIG_UNBLOCK, &unblock_signals, NULL);
- /* Close whatever files are open. */
- close(0);
- close(1);
- close(2);
-
/* Open the new terminal device */
- open_new_terminal(a->terminal, 0);
-
- /* Make sure the terminal will act fairly normal for us */
- set_term(0);
- /* Setup stdout, stderr on the supplied terminal */
- dup(0);
- dup(0);
+ open_stdio_to_tty(a->terminal, 0 /* - halt if open fails */);
- messageD(CONSOLE | LOG, "Trying to re-exec %s", a->command);
- execl(a->command, a->command, NULL);
+ messageD(L_CONSOLE | L_LOG, "Trying to re-exec %s", a->command);
+ BB_EXECLP(a->command, a->command, NULL);
- message(CONSOLE | LOG, "exec of '%s' failed: %m",
- a->command);
- sync();
+ message(L_CONSOLE | L_LOG, "Cannot run '%s': %s",
+ a->command, strerror(errno));
sleep(2);
init_reboot(RB_HALT_SYSTEM);
loop_forever();
}
}
-static void halt_signal(int sig ATTRIBUTE_UNUSED)
-{
- shutdown_system();
- message(CONSOLE | LOG, "The system is halted.");
- sync();
-
- /* allow time for last message to reach serial console */
- sleep(2);
-
- if (sig == SIGUSR2)
- init_reboot(RB_POWER_OFF);
- else
- init_reboot(RB_HALT_SYSTEM);
-
- loop_forever();
-}
-
-static void reboot_signal(int sig ATTRIBUTE_UNUSED)
-{
- shutdown_system();
- message(CONSOLE | LOG, "Please stand by while rebooting the system.");
- sync();
-
- /* allow time for last message to reach serial console */
- sleep(2);
-
- init_reboot(RB_AUTOBOOT);
-
- loop_forever();
-}
-
static void ctrlaltdel_signal(int sig ATTRIBUTE_UNUSED)
{
run_actions(CTRLALTDEL);
got_cont = 0;
while (!got_cont)
pause();
- got_cont = 0;
+
errno = saved_errno;
}
got_cont = 1;
}
-#endif /* ! DEBUG_INIT */
-
-static void new_init_action(int action, const char *command, const char *cons)
+static void new_init_action(uint8_t action, const char *command, const char *cons)
{
struct init_action *new_action, *a, *last;
- if (*cons == '\0')
- cons = console;
-
if (strcmp(cons, bb_dev_null) == 0 && (action & ASKFIRST))
return;
- new_action = calloc((size_t) (1), sizeof(struct init_action));
- if (!new_action) {
- message(LOG | CONSOLE, "Memory allocation failure");
- loop_forever();
- }
-
/* 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)) {
+ if ((strcmp(a->command, command) == 0)
+ && (strcmp(a->terminal, cons) == 0)
+ ) {
a->action = action;
- free(new_action);
return;
}
last = a;
}
+
+ new_action = xzalloc(sizeof(struct init_action));
if (last) {
last->next = new_action;
} else {
strcpy(new_action->command, command);
new_action->action = action;
strcpy(new_action->terminal, cons);
-#if 0 /* calloc zeroed always */
- new_action->pid = 0;
-#endif
- messageD(LOG|CONSOLE, "command='%s' action='%d' terminal='%s'\n",
+ messageD(L_LOG | L_CONSOLE, "command='%s' action=%d tty='%s'\n",
new_action->command, new_action->action, new_action->terminal);
}
*/
static void parse_inittab(void)
{
-#ifdef CONFIG_FEATURE_USE_INITTAB
FILE *file;
- char buf[INIT_BUFFS_SIZE], lineAsRead[INIT_BUFFS_SIZE];
- char tmpConsole[CONSOLE_BUFF_SIZE];
- char *id, *runlev, *action, *command, *eol;
- const struct init_action_type *a = actions;
+ char buf[INIT_BUFFS_SIZE];
+ if (ENABLE_FEATURE_USE_INITTAB)
+ file = fopen(INITTAB, "r");
+ else
+ file = NULL;
- file = fopen(INITTAB, "r");
+ /* 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, "/sbin/reboot", "");
+ new_init_action(CTRLALTDEL, "reboot", "");
/* Umount all filesystems on halt/reboot */
- new_init_action(SHUTDOWN, "/bin/umount -a -r", "");
+ new_init_action(SHUTDOWN, "umount -a -r", "");
/* Swapoff on halt/reboot */
- if(ENABLE_SWAPONOFF) new_init_action(SHUTDOWN, "/sbin/swapoff -a", "");
+ if (ENABLE_SWAPONOFF)
+ new_init_action(SHUTDOWN, "swapoff -a", "");
/* Prepare to restart init when a HUP is received */
- new_init_action(RESTART, "/sbin/init", "");
+ new_init_action(RESTART, "init", "");
/* Askfirst shell on tty1-4 */
new_init_action(ASKFIRST, bb_default_login_shell, "");
new_init_action(ASKFIRST, bb_default_login_shell, VC_2);
new_init_action(SYSINIT, INIT_SCRIPT, "");
return;
-#ifdef CONFIG_FEATURE_USE_INITTAB
}
while (fgets(buf, INIT_BUFFS_SIZE, file) != NULL) {
- /* Skip leading spaces */
- for (id = buf; *id == ' ' || *id == '\t'; id++);
+ 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);
/* Skip the line if it's a comment */
if (*id == '#' || *id == '\n')
continue;
+ /* Trim the trailing '\n' */
+ *strchrnul(id, '\n') = '\0';
- /* Trim the trailing \n */
- 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 */
+ /* Line is: "id:runlevel_ignored:action:command" */
runlev = strchr(id, ':');
- if (runlev == NULL || *(runlev + 1) == '\0') {
- message(LOG | 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(LOG | 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(LOG | 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 (runlev == NULL /*|| runlev[1] == '\0' - not needed */)
+ goto bad_entry;
+ action = strchr(runlev + 1, ':');
+ if (action == NULL /*|| action[1] == '\0' - not needed */)
+ goto bad_entry;
+ command = strchr(action + 1, ':');
+ if (command == NULL || command[1] == '\0')
+ 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)
+ if (strncmp(id, "/dev/", 5) == 0)
id += 5;
strcpy(tmpConsole, "/dev/");
safe_strncpy(tmpConsole + 5, id,
- CONSOLE_BUFF_SIZE - 5);
+ sizeof(tmpConsole) - 5);
id = tmpConsole;
}
- new_init_action(a->action, command, id);
- break;
+ new_init_action((uint8_t)a[0], command + 1, id);
+ goto next_line;
}
}
- if (a->name == 0) {
- /* Choke on an unknown action */
- message(LOG | CONSOLE, "Bad inittab entry: %s", lineAsRead);
- }
+ *command = ':';
+ /* Choke on an unknown action */
+ bad_entry:
+ message(L_LOG | L_CONSOLE, "Bad inittab entry: %s", id);
+ next_line: ;
}
fclose(file);
- return;
-#endif /* CONFIG_FEATURE_USE_INITTAB */
}
-#ifdef CONFIG_FEATURE_USE_INITTAB
static void reload_signal(int sig ATTRIBUTE_UNUSED)
{
struct init_action *a, *tmp;
- message(LOG, "Reloading /etc/inittab");
+ message(L_LOG, "reloading /etc/inittab");
/* disable old entrys */
- for (a = init_action_list; a; a = a->next ) {
+ for (a = init_action_list; a; a = a->next) {
a->action = 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 & ONCE) && pid != 0) {
+ kill(pid, SIGTERM);
+ }
+ }
+#if CONFIG_FEATURE_KILL_DELAY
+ if (fork() == 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) {
+ kill(pid, SIGKILL);
+ }
+ }
+ _exit(0);
+ }
+#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 & (ONCE | SYSINIT | WAIT)) && a->pid == 0) {
delete_init_action(a);
}
}
run_actions(RESPAWN);
- return;
}
-#endif /* CONFIG_FEATURE_USE_INITTAB */
+int init_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int init_main(int argc, char **argv)
{
struct init_action *a;
pid_t wpid;
- int status;
+
+ die_sleep = 30 * 24*60*60; /* if xmalloc will ever die... */
if (argc > 1 && !strcmp(argv[1], "-q")) {
- return kill(1,SIGHUP);
+ return kill(1, SIGHUP);
}
-#ifndef DEBUG_INIT
- /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
- if (getpid() != 1 &&
- (!ENABLE_FEATURE_INITRD || !strstr(bb_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(SIGHUP, exec_restart_action);
+ signal(SIGQUIT, exec_restart_action);
+ signal(SIGUSR1, halt_reboot_pwoff); /* halt */
+ signal(SIGUSR2, halt_reboot_pwoff); /* poweroff */
+ signal(SIGTERM, halt_reboot_pwoff); /* reboot */
+ signal(SIGINT, ctrlaltdel_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);
}
- /* Set up sig handlers -- be sure to
- * clear all of these in run() */
- signal(SIGHUP, exec_signal);
- signal(SIGQUIT, exec_signal);
- signal(SIGUSR1, halt_signal);
- signal(SIGUSR2, halt_signal);
- signal(SIGINT, ctrlaltdel_signal);
- signal(SIGTERM, reboot_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();
-
- /* Close whatever files are open, and reset the console. */
- close(0);
- close(1);
- close(2);
-
- if (device_open(console, O_RDWR | O_NOCTTY) == 0) {
- set_term(0);
- close(0);
- }
-
+ set_sane_term();
chdir("/");
setsid();
{
- const char * const *e;
+ const char *const *e;
/* Make sure environs is set to something sane */
- for(e = environment; *e; e++)
+ for (e = environment; *e; e++)
putenv((char *) *e);
}
+
+ if (argc > 1) setenv("RUNLEVEL", argv[1], 1);
+
/* Hello world */
- message(MAYBE_CONSOLE | 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) {
struct sysinfo info;
if (!sysinfo(&info) &&
- (info.mem_unit ? : 1) * (long long)info.totalram < MEGABYTE)
+ (info.mem_unit ? : 1) * (long long)info.totalram < 1024*1024)
{
- message(CONSOLE,"Low memory: forcing swapon.");
+ message(L_CONSOLE, "Low memory, forcing swapon");
/* swapon -a requires /proc typically */
- new_init_action(SYSINIT, "/bin/mount -t proc proc /proc", "");
+ new_init_action(SYSINIT, "mount -t proc proc /proc", "");
/* Try to turn on swap */
- new_init_action(SYSINIT, "/sbin/swapon -a", "");
+ new_init_action(SYSINIT, "swapon -a", "");
run_actions(SYSINIT); /* wait and removing */
}
}
/* Check if we are supposed to be in single user mode */
- if (argc > 1 && (!strcmp(argv[1], "single") ||
- !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
+ if (argc > 1
+ && (!strcmp(argv[1], "single") || !strcmp(argv[1], "-s") || LONE_CHAR(argv[1], '1'))
+ ) {
/* Start a shell on console */
new_init_action(RESPAWN, bb_default_login_shell, "");
} else {
parse_inittab();
}
-#ifdef CONFIG_SELINUX
+#if ENABLE_SELINUX
if (getenv("SELINUX_INIT") == NULL) {
int enforce = 0;
- putenv("SELINUX_INIT=YES");
+ putenv((char*)"SELINUX_INIT=YES");
if (selinux_init_load_policy(&enforce) == 0) {
- execv(argv[0], argv);
+ 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(CONSOLE,"Unable to load SELinux Policy. Machine is in enforcing mode. Halting now.");
+ message(L_CONSOLE, "Cannot load SELinux Policy. "
+ "Machine is in enforcing mode. Halting now.");
exit(1);
}
}
#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);
-#ifdef CONFIG_FEATURE_USE_INITTAB
/* Redefine SIGHUP to reread /etc/inittab */
- signal(SIGHUP, reload_signal);
-#else
- signal(SIGHUP, SIG_IGN);
-#endif /* CONFIG_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) {
/* Don't consume all CPU time -- sleep a bit */
sleep(1);
- /* Wait for a child process to exit */
- wpid = wait(&status);
+ /* Wait for any child process to exit */
+ wpid = wait(NULL);
while (wpid > 0) {
/* Find out who died and clean up their corpse */
for (a = init_action_list; a; a = a->next) {
/* Set the pid to 0 so that the process gets
* restarted by run_actions() */
a->pid = 0;
- message(LOG, "Process '%s' (pid %d) exited. "
+ message(L_LOG, "process '%s' (pid %d) exited. "
"Scheduling it for restart.",
a->command, wpid);
}
}
/* see if anyone else is waiting to be reaped */
- wpid = waitpid (-1, &status, WNOHANG);
+ wpid = wait_any_nohang(NULL);
}
}
}
projects / oweals / busybox.git / blobdiff