X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=init%2Finit.c;h=2e8ca3ca83d35d02b44f6c0acf386bfb2d7275a2;hb=98ee06d3d46aa7f89c204681c7075b53300a6a6e;hp=be91d6a8f075696b10830b61ba78ba46172673bb;hpb=cad5364599eb5062d59e0c397ed638ddd61a8d5d;p=oweals%2Fbusybox.git diff --git a/init/init.c b/init/init.c index be91d6a8f..2e8ca3ca8 100644 --- a/init/init.c +++ b/init/init.c @@ -3,54 +3,26 @@ * Mini init implementation for busybox * * Copyright (C) 1995, 1996 by Bruce Perens . - * Copyright (C) 1999-2002 by Erik Andersen + * Copyright (C) 1999-2004 by Erik Andersen * Adjusted by so many folks, it's impossible to keep track. * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * + * 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 -#include +#include "busybox.h" #include #include #include -#include -#include -#include -#include -#include -#include #include -#include -#include #include -#include "busybox.h" +#include + +#include "init_shared.h" + #ifdef CONFIG_SYSLOGD # include #endif -#if defined(__UCLIBC__) && !defined(__UCLIBC_HAS_MMU__) -#define fork vfork -#endif - #define INIT_BUFFS_SIZE 256 /* From */ @@ -59,60 +31,46 @@ struct vt_stat { unsigned short v_signal; /* signal to send */ unsigned short v_state; /* vt bitmask */ }; -static const int VT_GETSTATE = 0x5603; /* get global vt state info */ +enum { VT_GETSTATE = 0x5603 }; /* get global vt state info */ /* From */ struct serial_struct { - int type; - int line; - int port; - int irq; - int flags; - int xmit_fifo_size; - int custom_divisor; - int baud_base; - unsigned short close_delay; - char reserved_char[2]; - int hub6; - unsigned short closing_wait; /* time to wait before closing */ - unsigned short closing_wait2; /* no longer used... */ - int reserved[4]; + 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]; }; - -#if (__GNU_LIBRARY__ > 5) || defined(__dietlibc__) -#include -#define init_reboot(magic) reboot(magic) -#else -#define init_reboot(magic) reboot(0xfee1dead, 672274793, magic) -#endif - #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 + * When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called * before processes are spawned to set core file size as unlimited. * This is for debugging only. Don't use this is production, unless * you want core dumps lying about.... */ #define CORE_ENABLE_FLAG_FILE "/.init_enable_core" #include -#include -#endif - -#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c)) - -#if __GNU_LIBRARY__ > 5 -#include -#else -extern int bdflush(int func, long int data); #endif -#define SHELL "/bin/sh" /* Default shell */ -#define LOGIN_SHELL "-" SHELL /* Default login shell */ #define INITTAB "/etc/inittab" /* inittab file location */ #ifndef INIT_SCRIPT #define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */ @@ -161,42 +119,48 @@ struct init_action { /* Static variables */ static struct init_action *init_action_list = NULL; -static int kernelVersion; -static char console[CONSOLE_BUFF_SIZE] = _PATH_CONSOLE; +static char console[CONSOLE_BUFF_SIZE] = CONSOLE_DEV; #ifndef CONFIG_SYSLOGD -static char *log = VC_5; +static char *log_console = VC_5; #endif +#if !ENABLE_DEBUG_INIT static sig_atomic_t got_cont = 0; -static const int LOG = 0x1; -static const int CONSOLE = 0x2; +#endif + +enum { + LOG = 0x1, + CONSOLE = 0x2, #if defined CONFIG_FEATURE_EXTRA_QUIET -static const int MAYBE_CONSOLE = 0x0; + MAYBE_CONSOLE = 0x0, #else -#define MAYBE_CONSOLE CONSOLE + MAYBE_CONSOLE = CONSOLE, #endif -#ifndef RB_HALT_SYSTEM -static const int RB_HALT_SYSTEM = 0xcdef0123; -static const int RB_ENABLE_CAD = 0x89abcdef; -static const int RB_DISABLE_CAD = 0; -#define RB_POWER_OFF 0x4321fedc -static const int RB_AUTOBOOT = 0x01234567; +#ifndef RB_HALT_SYSTEM + RB_HALT_SYSTEM = 0xcdef0123, /* FIXME: this overflows enum */ + RB_ENABLE_CAD = 0x89abcdef, + RB_DISABLE_CAD = 0, + RB_POWER_OFF = 0x4321fedc, + RB_AUTOBOOT = 0x01234567, #endif +}; static const char * const environment[] = { "HOME=/", "PATH=" _PATH_STDPATH, - "SHELL=" SHELL, + "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 int waitfor(const struct init_action *a, pid_t pid); +#if !ENABLE_DEBUG_INIT +static void shutdown_signal(int sig); +#endif static void loop_forever(void) { @@ -206,12 +170,10 @@ static void loop_forever(void) /* Print a message to the specified device. * Device may be bitwise-or'd from LOG | CONSOLE */ -#ifndef DEBUG_INIT -static inline void messageD(int device, const char *fmt, ...) -{ -} -#else +#if ENABLE_DEBUG_INIT #define messageD message +#else +#define messageD(...) do {} while (0) #endif static void message(int device, const char *fmt, ...) __attribute__ ((format(printf, 2, 3))); @@ -219,21 +181,23 @@ static void message(int device, const char *fmt, ...) { va_list arguments; int l; - char msg[1024]; + RESERVE_CONFIG_BUFFER(msg, 1024); #ifndef CONFIG_SYSLOGD static int log_fd = -1; #endif msg[0] = '\r'; va_start(arguments, fmt); - l = vsnprintf(msg + 1, sizeof(msg) - 2, fmt, arguments) + 1; + l = vsnprintf(msg + 1, 1024 - 2, fmt, arguments) + 1; va_end(arguments); #ifdef CONFIG_SYSLOGD /* Log the message to syslogd */ if (device & LOG) { /* don`t out "\r\n" */ - syslog_msg(LOG_DAEMON, LOG_INFO, msg + 1); + openlog(applet_name, 0, LOG_DAEMON); + syslog(LOG_INFO, "%s", msg + 1); + closelog(); } msg[l++] = '\n'; @@ -245,44 +209,45 @@ static void message(int device, const char *fmt, ...) /* 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, O_RDWR | O_NDELAY | O_NOCTTY)) < 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); + bb_error_msg("bummer, can't write to log on %s!", log_console); device = CONSOLE; } else { fcntl(log_fd, F_SETFD, FD_CLOEXEC); } } if ((device & LOG) && (log_fd >= 0)) { - bb_full_write(log_fd, msg, l); + full_write(log_fd, msg, l); } #endif if (device & CONSOLE) { - int fd = device_open(_PATH_CONSOLE, - O_WRONLY | O_NOCTTY | O_NDELAY); + int fd = device_open(CONSOLE_DEV, + O_WRONLY | O_NOCTTY | O_NONBLOCK); /* Always send console messages to /dev/console so people will see them. */ if (fd >= 0) { - bb_full_write(fd, msg, l); + full_write(fd, msg, l); close(fd); -#ifdef DEBUG_INIT +#if ENABLE_DEBUG_INIT /* all descriptors may be closed */ } else { - bb_error_msg("Bummer, can't print: "); + bb_error_msg("bummer, can't print: "); va_start(arguments, fmt); vfprintf(stderr, fmt, arguments); va_end(arguments); #endif } } + RELEASE_CONFIG_BUFFER(msg); } /* Set terminal settings to reasonable defaults */ -static void set_term(int fd) +static void set_term(void) { struct termios tty; - tcgetattr(fd, &tty); + tcgetattr(STDIN_FILENO, &tty); /* set control chars */ tty.c_cc[VINTR] = 3; /* C-c */ @@ -312,35 +277,7 @@ static void set_term(int fd) tty.c_lflag = ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN; - tcsetattr(fd, TCSANOW, &tty); -} - -/* How much memory does this machine have? - Units are kBytes to avoid overflow on 4GB machines */ -static int check_free_memory(void) -{ - struct sysinfo info; - unsigned int result, u, s = 10; - - if (sysinfo(&info) != 0) { - bb_perror_msg("Error checking free memory"); - return -1; - } - - /* Kernels 2.0.x and 2.2.x return info.mem_unit==0 with values in bytes. - * Kernels 2.4.0 return info.mem_unit in bytes. */ - u = info.mem_unit; - if (u == 0) - u = 1; - while ((u & 1) == 0 && s > 0) { - u >>= 1; - s--; - } - result = (info.totalram >> s) + (info.totalswap >> s); - result = result * u; - if (result < 0) - result = INT_MAX; - return result; + tcsetattr(STDIN_FILENO, TCSANOW, &tty); } static void console_init(void) @@ -353,15 +290,6 @@ static void console_init(void) 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) { @@ -371,7 +299,7 @@ static void console_init(void) /* this is linux virtual tty */ snprintf(console, sizeof(console) - 1, VC_FORMAT, vt.v_active); } else { - safe_strncpy(console, _PATH_CONSOLE, sizeof(console)); + safe_strncpy(console, CONSOLE_DEV, sizeof(console)); tried++; } } @@ -379,16 +307,16 @@ static void console_init(void) 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), + safe_strncpy(console, (tried == 0 ? CONSOLE_DEV : CURRENT_VC), sizeof(console)); tried++; } if (fd < 0) { /* Perhaps we should panic here? */ #ifndef CONFIG_SYSLOGD - log = + log_console = #endif - safe_strncpy(console, "/dev/null", sizeof(console)); + safe_strncpy(console, bb_dev_null, sizeof(console)); } else { s = getenv("TERM"); /* check for serial console */ @@ -398,7 +326,7 @@ static void console_init(void) if (s == NULL || strcmp(s, "linux") == 0) putenv("TERM=vt102"); #ifndef CONFIG_SYSLOGD - log = console; + log_console = console; #endif } else { if (s == NULL) @@ -426,11 +354,31 @@ static void fixup_argv(int argc, char **argv, char *new_argv0) } } +/* Open the new terminal device */ +static void open_new_terminal(const char * const device, const int 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); + } + if (fail) + _exit(1); + /* else */ +#if !ENABLE_DEBUG_INIT + shutdown_signal(SIGUSR1); +#else + _exit(2); +#endif + } +} + static pid_t run(const struct init_action *a) { - struct stat sb; - int i, junk; - pid_t pid, pgrp, tmp_pid; + int i; + pid_t pid; char *s, *tmpCmd, *cmd[INIT_BUFFS_SIZE], *cmdpath; char buf[INIT_BUFFS_SIZE + 6]; /* INIT_BUFFS_SIZE+strlen("exec ")+1 */ sigset_t nmask, omask; @@ -446,6 +394,7 @@ static pid_t run(const struct init_action *a) sigprocmask(SIG_BLOCK, &nmask, &omask); if ((pid = fork()) == 0) { + /* Clean up */ close(0); close(1); @@ -458,6 +407,7 @@ static pid_t run(const struct init_action *a) 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); @@ -467,18 +417,10 @@ static pid_t run(const struct init_action *a) setsid(); /* Open the new terminal device */ - if ((device_open(a->terminal, O_RDWR)) < 0) { - if (stat(a->terminal, &sb) != 0) { - message(LOG | CONSOLE, "device '%s' does not exist.", - a->terminal); - _exit(1); - } - message(LOG | CONSOLE, "Bummer, can't open %s", a->terminal); - _exit(1); - } + open_new_terminal(a->terminal, 1); /* Make sure the terminal will act fairly normal for us */ - set_term(0); + set_term(); /* Setup stdout, stderr for the new process so * they point to the supplied terminal */ dup(0); @@ -502,12 +444,9 @@ static pid_t run(const struct init_action *a) signal(SIGQUIT, SIG_IGN); signal(SIGCHLD, SIG_DFL); - /* Wait for child to exit */ - while ((tmp_pid = waitpid(pid, &junk, 0)) != pid); - + waitfor(NULL, pid); /* See if stealing the controlling tty back is necessary */ - pgrp = tcgetpgrp(0); - if (pgrp != getpid()) + if (tcgetpgrp(0) != getpid()) _exit(0); /* Use a temporary process to steal the controlling tty. */ @@ -520,10 +459,7 @@ static pid_t run(const struct init_action *a) ioctl(0, TIOCSCTTY, 1); _exit(0); } - while ((tmp_pid = waitpid(pid, &junk, 0)) != pid) { - if (tmp_pid < 0 && errno == ECHILD) - break; - } + waitfor(NULL, pid); _exit(0); } @@ -532,7 +468,7 @@ static pid_t run(const struct init_action *a) /* See if any special /bin/sh requiring characters are present */ if (strpbrk(a->command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) { - cmd[0] = SHELL; + cmd[0] = (char *)DEFAULT_SHELL; cmd[1] = "-c"; cmd[2] = strcat(strcpy(buf, "exec "), a->command); cmd[3] = NULL; @@ -553,8 +489,8 @@ static pid_t run(const struct init_action *a) /* 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 + 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"). */ @@ -574,8 +510,16 @@ static pid_t run(const struct init_action *a) cmd[0][0] = '-'; strcpy(cmd[0] + 1, s); } +#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 } +#if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__) if (a->action & ASKFIRST) { char c; /* @@ -583,56 +527,63 @@ static pid_t run(const struct init_action *a) * 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 + * 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') + full_write(1, press_enter, sizeof(press_enter) - 1); + while (read(0, &c, 1) == 1 && c != '\n') ; } +#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 - 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); + { + 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 - /* Now run it. The new program will take over this PID, + /* 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); + message(LOG | CONSOLE, "Bummer, cannot run '%s': %m", cmdpath); _exit(-1); } sigprocmask(SIG_SETMASK, &omask, NULL); return pid; } -static int waitfor(const struct init_action *a) +static int waitfor(const struct init_action *a, pid_t pid) { - int pid; + int runpid; int status, wpid; - pid = run(a); + runpid = (NULL == a)? pid : run(a); while (1) { - wpid = wait(&status); - if (wpid > 0 && wpid != pid) { - continue; - } - if (wpid == pid) + wpid = waitpid(runpid,&status,0); + if (wpid == runpid) break; + if (wpid == -1 && errno == ECHILD) { + /* we missed its termination */ + break; + } + /* FIXME other errors should maybe trigger an error, but allow + * the program to continue */ } return wpid; } @@ -645,8 +596,10 @@ static void run_actions(int action) for (a = init_action_list; a; a = tmp) { tmp = a->next; if (a->action == action) { - if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) { - waitfor(a); + if (access(a->terminal, R_OK | W_OK)) { + delete_init_action(a); + } else if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) { + waitfor(a, 0); delete_init_action(a); } else if (a->action & ONCE) { run(a); @@ -662,7 +615,20 @@ static void run_actions(int action) } } -#ifndef DEBUG_INIT +#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 + * linux/kernel/sys.c, which can cause the machine to panic when + * the init process is killed.... */ + if ((pid = fork()) == 0) { + reboot(magic); + _exit(0); + } + waitpid (pid, NULL, 0); +} + static void shutdown_system(void) { sigset_t block_signals; @@ -675,6 +641,7 @@ static void shutdown_system(void) /* 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); @@ -692,24 +659,19 @@ static void shutdown_system(void) sync(); /* Send signals to every process _except_ pid 1 */ - message(CONSOLE | LOG, "Sending SIGTERM to all processes."); + message(CONSOLE | LOG, init_sending_format, "TERM"); kill(-1, SIGTERM); sleep(1); sync(); - message(CONSOLE | LOG, "Sending SIGKILL to all processes."); + message(CONSOLE | LOG, init_sending_format, "KILL"); kill(-1, SIGKILL); sleep(1); sync(); - if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2, 2, 11)) { - /* bdflush, kupdate not needed for kernels >2.2.11 */ - bdflush(1, 0); - sync(); - } } -static void exec_signal(int sig) +static void exec_signal(int sig ATTRIBUTE_UNUSED) { struct init_action *a, *tmp; sigset_t unblock_signals; @@ -722,6 +684,7 @@ static void exec_signal(int sig) /* 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); @@ -732,6 +695,20 @@ static void exec_signal(int sig) 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(); + /* Setup stdout, stderr on the supplied terminal */ + dup(0); + dup(0); + messageD(CONSOLE | LOG, "Trying to re-exec %s", a->command); execl(a->command, a->command, NULL); @@ -745,51 +722,41 @@ static void exec_signal(int sig) } } -static void halt_signal(int sig) +static void shutdown_signal(int sig) { - shutdown_system(); - message(CONSOLE | LOG, -#if #cpu(s390) - /* Seems the s390 console is Wierd(tm). */ - "The system is halted. You may reboot now." -#else - "The system is halted. Press Reset or turn off power" -#endif - ); - sync(); - - /* allow time for last message to reach serial console */ - sleep(2); - - if (sig == SIGUSR2 && kernelVersion >= KERNEL_VERSION(2, 2, 0)) - init_reboot(RB_POWER_OFF); - else - init_reboot(RB_HALT_SYSTEM); - - loop_forever(); -} + char *m; + int rb; -static void reboot_signal(int sig) -{ shutdown_system(); - message(CONSOLE | LOG, "Please stand by while rebooting the system."); + + if (sig == SIGTERM) { + m = "reboot"; + rb = RB_AUTOBOOT; + } else if (sig == SIGUSR2) { + m = "poweroff"; + rb = RB_POWER_OFF; + } else { + m = "halt"; + rb = RB_HALT_SYSTEM; + } + message(CONSOLE | LOG, "Requesting system %s.", m); sync(); /* allow time for last message to reach serial console */ sleep(2); - init_reboot(RB_AUTOBOOT); + init_reboot(rb); loop_forever(); } -static void ctrlaltdel_signal(int sig) +static void ctrlaltdel_signal(int sig ATTRIBUTE_UNUSED) { run_actions(CTRLALTDEL); } /* The SIGSTOP & SIGTSTP handler */ -static void stop_handler(int sig) +static void stop_handler(int sig ATTRIBUTE_UNUSED) { int saved_errno = errno; @@ -801,24 +768,21 @@ static void stop_handler(int sig) } /* The SIGCONT handler */ -static void cont_handler(int sig) +static void cont_handler(int sig ATTRIBUTE_UNUSED) { got_cont = 1; } -#endif /* ! DEBUG_INIT */ +#endif /* ! ENABLE_DEBUG_INIT */ -static void new_init_action(int action, char *command, const char *cons) +static void new_init_action(int action, const char *command, const char *cons) { - struct init_action *new_action, *a; + struct init_action *new_action, *a, *last; if (*cons == '\0') cons = console; - /* do not run entries if console device is not available */ - if (access(cons, R_OK | W_OK)) - return; - if (strcmp(cons, "/dev/null") == 0 && (action & ASKFIRST)) + if (strcmp(cons, bb_dev_null) == 0 && (action & ASKFIRST)) return; new_action = calloc((size_t) (1), sizeof(struct init_action)); @@ -828,18 +792,25 @@ static void new_init_action(int action, char *command, const char *cons) } /* Append to the end of the list */ - for (a = init_action_list; a && a->next; a = a->next); - if (a) { - a->next = new_action; + 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; + free(new_action); + return; + } + last = a; + } + if (last) { + last->next = new_action; } else { init_action_list = new_action; } 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", new_action->command, new_action->action, new_action->terminal); } @@ -861,39 +832,11 @@ static void delete_init_action(struct init_action *action) } } -/* Make sure there is enough memory to do something useful. * - * Calls "swapon -a" if needed so be sure /etc/fstab is present... */ -static void check_memory(void) -{ - struct stat statBuf; - - if (check_free_memory() > 1000) - return; - -#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__) - if (stat("/etc/fstab", &statBuf) == 0) { - /* swapon -a requires /proc typically */ - new_init_action(SYSINIT, "/bin/mount -t proc proc /proc", ""); - /* Try to turn on swap */ - new_init_action(SYSINIT, "/sbin/swapon -a", ""); - run_actions(SYSINIT); /* wait and removing */ - if (check_free_memory() < 1000) - goto goodnight; - } else - goto goodnight; - return; -#endif - - goodnight: - message(CONSOLE, "Sorry, your computer does not have enough memory."); - loop_forever(); -} - /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined, * then parse_inittab() simply adds in some default - * actions(i.e., runs INIT_SCRIPT and then starts a pair - * of "askfirst" shells). If CONFIG_FEATURE_USE_INITTAB - * _is_ defined, but /etc/inittab is missing, this + * actions(i.e., runs INIT_SCRIPT and then starts a pair + * of "askfirst" shells). If CONFIG_FEATURE_USE_INITTAB + * _is_ defined, but /etc/inittab is missing, this * results in the same set of default behaviors. */ static void parse_inittab(void) @@ -914,17 +857,15 @@ static void parse_inittab(void) new_init_action(CTRLALTDEL, "/sbin/reboot", ""); /* Umount all filesystems on halt/reboot */ new_init_action(SHUTDOWN, "/bin/umount -a -r", ""); -#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__) /* Swapoff on halt/reboot */ - new_init_action(SHUTDOWN, "/sbin/swapoff -a", ""); -#endif + if(ENABLE_SWAPONOFF) new_init_action(SHUTDOWN, "/sbin/swapoff -a", ""); /* Prepare to restart init when a HUP is received */ new_init_action(RESTART, "/sbin/init", ""); /* Askfirst shell on tty1-4 */ - new_init_action(ASKFIRST, LOGIN_SHELL, ""); - new_init_action(ASKFIRST, LOGIN_SHELL, VC_2); - new_init_action(ASKFIRST, LOGIN_SHELL, VC_3); - new_init_action(ASKFIRST, LOGIN_SHELL, VC_4); + new_init_action(ASKFIRST, bb_default_login_shell, ""); + 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, ""); @@ -1003,52 +944,65 @@ static void parse_inittab(void) #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"); + + /* disable old entrys */ + for (a = init_action_list; a; a = a->next ) { + a->action = ONCE; + } + + parse_inittab(); + + /* remove unused entrys */ + for (a = init_action_list; a; a = tmp) { + tmp = a->next; + if (a->action & (ONCE | SYSINIT | WAIT ) && + a->pid == 0 ) { + delete_init_action(a); + } + } + run_actions(RESPAWN); + return; +} +#endif /* CONFIG_FEATURE_USE_INITTAB */ -extern int init_main(int argc, char **argv) +int init_main(int argc, char **argv) { struct init_action *a; pid_t wpid; - int status; if (argc > 1 && !strcmp(argv[1], "-q")) { - /* don't assume init's pid == 1 */ - long *pid = find_pid_by_name("init"); - - if (!pid || *pid <= 0) { - pid = find_pid_by_name("linuxrc"); - if (!pid || *pid <= 0) - bb_error_msg_and_die("no process killed"); - } - return kill(*pid, SIGHUP); + return kill(1,SIGHUP); } -#ifndef DEBUG_INIT +#if !ENABLE_DEBUG_INIT /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */ - if (getpid() != 1 -#ifdef CONFIG_FEATURE_INITRD - && strstr(bb_applet_name, "linuxrc") == NULL -#endif - ) { + if (getpid() != 1 && + (!ENABLE_FEATURE_INITRD || !strstr(applet_name, "linuxrc"))) + { bb_show_usage(); } /* Set up sig handlers -- be sure to * clear all of these in run() */ signal(SIGHUP, exec_signal); - signal(SIGUSR1, halt_signal); - signal(SIGUSR2, halt_signal); + signal(SIGQUIT, exec_signal); + signal(SIGUSR1, shutdown_signal); + signal(SIGUSR2, shutdown_signal); signal(SIGINT, ctrlaltdel_signal); - signal(SIGTERM, reboot_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 + /* 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 what kernel this is running */ - kernelVersion = get_kernel_revision(); - /* Figure out where the default console should be */ console_init(); @@ -1058,7 +1012,7 @@ extern int init_main(int argc, char **argv) close(2); if (device_open(console, O_RDWR | O_NOCTTY) == 0) { - set_term(0); + set_term(); close(0); } @@ -1067,30 +1021,63 @@ extern int init_main(int argc, char **argv) { 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); /* Make sure there is enough memory to do something useful. */ - check_memory(); + if (ENABLE_SWAPONOFF) { + struct sysinfo info; + + if (!sysinfo(&info) && + (info.mem_unit ? : 1) * (long long)info.totalram < 1024*1024) + { + message(CONSOLE,"Low memory: forcing swapon."); + /* swapon -a requires /proc typically */ + new_init_action(SYSINIT, "/bin/mount -t proc proc /proc", ""); + /* Try to turn on swap */ + new_init_action(SYSINIT, "/sbin/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, LOGIN_SHELL, ""); + new_init_action(RESPAWN, bb_default_login_shell, ""); } else { /* Not in single user mode -- see what inittab says */ /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined, * then parse_inittab() simply adds in some default - * actions(i.e., runs INIT_SCRIPT and then starts a pair + * actions(i.e., runs INIT_SCRIPT and then starts a pair * of "askfirst" shells */ parse_inittab(); } +#ifdef CONFIG_SELINUX + if (getenv("SELINUX_INIT") == NULL) { + int enforce = 0; + + putenv("SELINUX_INIT=YES"); + if (selinux_init_load_policy(&enforce) == 0) { + execv(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."); + exit(1); + } + } +#endif /* CONFIG_SELINUX */ + /* Make the command line just say "init" -- thats all, nothing else */ fixup_argv(argc, argv, "init"); @@ -1105,12 +1092,13 @@ extern int init_main(int argc, char **argv) /* Next run anything to be run only once */ run_actions(ONCE); - /* If there is nothing else to do, stop */ - if (init_action_list == NULL) { - message(LOG | CONSOLE, - "No more tasks for init -- sleeping forever."); - loop_forever(); - } +#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 */ + /* Now run the looping stuff for the rest of forever */ while (1) { @@ -1124,7 +1112,7 @@ extern int init_main(int argc, char **argv) sleep(1); /* Wait for a child process to exit */ - wpid = wait(&status); + wpid = wait(NULL); while (wpid > 0) { /* Find out who died and clean up their corpse */ for (a = init_action_list; a; a = a->next) { @@ -1138,15 +1126,7 @@ extern int init_main(int argc, char **argv) } } /* see if anyone else is waiting to be reaped */ - wpid = waitpid (-1, &status, WNOHANG); + wpid = waitpid(-1, NULL, WNOHANG); } } } - -/* -Local Variables: -c-file-style: "linux" -c-basic-offset: 4 -tab-width: 4 -End: -*/