X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;ds=sidebyside;f=init.c;h=f6e9eff971d1d6f4e0713401c88962dc4402b95b;hb=ab746abfc05c28824b25e12b86a538b09fb9275d;hp=2834a4a05ace313dd2679db495dafd25ac612ae0;hpb=8a8fbb87f70dbfbcee4d64b3d82831e2ccc6a587;p=oweals%2Fbusybox.git diff --git a/init.c b/init.c index 2834a4a05..f6e9eff97 100644 --- a/init.c +++ b/init.c @@ -41,20 +41,22 @@ #include /* for vt_stat */ #include -#define DEBUG_INIT - -#define CONSOLE "/dev/console" /* Logical system console */ -#define VT_PRIMARY "/dev/tty0" /* Virtual console master */ -#define VT_SECONDARY "/dev/tty1" /* Virtual console master */ -#define VT_LOG "/dev/tty2" /* Virtual console master */ +#define DEV_CONSOLE "/dev/console" /* Logical system console */ +#define VT_PRIMARY "/dev/tty1" /* Primary virtual console */ +#define VT_SECONDARY "/dev/tty2" /* Virtual console */ +#define VT_LOG "/dev/tty3" /* Virtual console */ +#define SERIAL_CON0 "/dev/ttyS0" /* Primary serial console */ +#define SERIAL_CON1 "/dev/ttyS1" /* Serial console */ #define SHELL "/bin/sh" /* Default shell */ #define INITSCRIPT "/etc/init.d/rcS" /* Initscript. */ #define PATH_DEFAULT "PATH=/usr/local/sbin:/sbin:/bin:/usr/sbin:/usr/bin" -static char *console = CONSOLE; -static char *second_terminal = "/dev/tty2"; -static char *log = "/dev/tty3"; - +#define LOG 0x1 +#define CONSOLE 0x2 +static char *console = DEV_CONSOLE; +static char *second_console = VT_SECONDARY; +static char *log = VT_LOG; +static int kernel_version = 0; /* try to open up the specified device */ @@ -62,7 +64,7 @@ int device_open(char *device, int mode) { int m, f, fd = -1; - mode = m | O_NONBLOCK; + m = mode | O_NONBLOCK; /* Retry up to 5 times */ for (f = 0; f < 5; f++) @@ -70,70 +72,106 @@ int device_open(char *device, int mode) break; if (fd < 0) return fd; - /* Set original flags. */ + /* Reset original flags. */ if (m != mode) fcntl(fd, F_SETFL, mode); return fd; } -/* print a message to the specified device */ -void message(char *device, char *fmt, ...) +/* print a message to the specified device: + * device may be bitwise-or'd from LOG | CONSOLE */ +void message(int device, char *fmt, ...) { int fd; + static int log_fd=-1; va_list arguments; - if ((fd = device_open(device, O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) { + /* Take full control of the log tty, and never close it. + * It's mine, all mine! Muhahahaha! */ + if (log_fd < 0) { + if (log == NULL) { + /* don't even try to log, because there is no such console */ + log_fd = -2; + /* log to main console instead */ + device = CONSOLE; + } + else if ((log_fd = device_open(log, O_RDWR|O_NDELAY)) < 0) { + log_fd=-1; + fprintf(stderr, "Bummer, can't write to log on %s!\r\n", log); + fflush(stderr); + return; + } + } + + if ( (device & LOG) && (log_fd >= 0) ) { va_start(arguments, fmt); - vdprintf(fd, fmt, arguments); + vdprintf(log_fd, fmt, arguments); va_end(arguments); - close(fd); - } else - vprintf(fmt, arguments); + } + if (device & CONSOLE) { + /* Always send console messages to /dev/console so people will see them. */ + if ((fd = device_open(DEV_CONSOLE, O_WRONLY|O_NOCTTY|O_NDELAY)) >= 0) { + va_start(arguments, fmt); + vdprintf(fd, fmt, arguments); + va_end(arguments); + close(fd); + } else { + fprintf(stderr, "Bummer, can't print: "); + va_start(arguments, fmt); + vfprintf(stderr, fmt, arguments); + fflush(stderr); + va_end(arguments); + } + } } + /* Set terminal settings to reasonable defaults */ -void set_term() +void set_term( int fd) { - int fd; struct termios tty; + static const char control_characters[] = { + '\003', '\034', '\177', '\030', '\004', '\0', + '\1', '\0', '\021', '\023', '\032', '\0', '\022', + '\017', '\027', '\026', '\0' + }; - if ((fd = device_open(console, O_RDWR | O_NOCTTY)) < 0) { - message(log, "can't open %s\n", console); - return; - } - ioctl(fd, TCGETS, &tty); - tty.c_cflag &= CBAUD | CBAUDEX | CSIZE | CSTOPB | PARENB | PARODD; - tty.c_cflag |= HUPCL | CLOCAL; - - tty.c_cc[VINTR] = 3; - tty.c_cc[VQUIT] = 28; - tty.c_cc[VERASE] = 127; - tty.c_cc[VKILL] = 24; - tty.c_cc[VEOF] = 4; - tty.c_cc[VTIME] = 0; - tty.c_cc[VMIN] = 1; - tty.c_cc[VSTART] = 17; - tty.c_cc[VSTOP] = 19; - tty.c_cc[VSUSP] = 26; - - /* Set pre and post processing */ - tty.c_iflag = IGNPAR | ICRNL | IXON | IXANY; - tty.c_oflag = OPOST | ONLCR; - tty.c_lflag = ISIG | ICANON | ECHO | ECHOCTL | ECHOPRT | ECHOKE; - - /* Now set the terminal line. */ - ioctl(fd, TCSETS, &tty); - close(fd); + tcgetattr(fd, &tty); + + /* Make it be sane */ + tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD; + tty.c_cflag |= HUPCL|CLOCAL; + + /* input modes */ + tty.c_iflag = IGNPAR|ICRNL|IXON|IXOFF|IXANY; + + /* use line dicipline 0 */ + tty.c_line = 0; + + /* output modes */ + tty.c_oflag = OPOST|ONLCR; + + /* local modes */ + tty.c_lflag = ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOPRT|ECHOKE|IEXTEN; + + /* control chars */ + memcpy(tty.c_cc, control_characters, sizeof(control_characters)); + + tcsetattr(fd, TCSANOW, &tty); } +/* How much memory does this machine have? */ static int mem_total() { char s[80]; - char *p; + char *p = "/proc/meminfo"; FILE *f; const char pattern[] = "MemTotal:"; - f = fopen("/proc/meminfo", "r"); + if ((f = fopen(p, "r")) < 0) { + message(LOG, "Error opening %s: %s\n", p, strerror( errno)); + return -1; + } while (NULL != fgets(s, 79, f)) { p = strstr(s, pattern); if (NULL != p) { @@ -144,103 +182,99 @@ static int mem_total() return -1; } -static void set_free_pages() -{ - char s[80]; - FILE *f; - - f = fopen("/proc/sys/vm/freepages", "r"); - fgets(s, 79, f); - if (atoi(s) < 32) { - fclose(f); - f = fopen("/proc/sys/vm/freepages", "w"); - fprintf(f, "30\t40\t50\n"); - printf("\nIncreased /proc/sys/vm/freepages values to 30/40/50\n"); - } - fclose(f); -} - - static void console_init() { int fd; int tried_devcons = 0; - int tried_vtmaster = 0; + int tried_vtprimary = 0; + struct serial_struct sr; char *s; - if ((s = getenv("CONSOLE")) != NULL) + if ((s = getenv("CONSOLE")) != NULL) { console = s; + } +#if #cpu(sparc) + /* sparc kernel supports console=tty[ab] parameter which is also + * passed to init, so catch it here */ + else if ((s = getenv("console")) != NULL) { + /* remap tty[ab] to /dev/ttyS[01] */ + if (strcmp( s, "ttya" )==0) + console = SERIAL_CON0; + else if (strcmp( s, "ttyb" )==0) + console = SERIAL_CON1; + } +#endif else { - console = CONSOLE; - tried_devcons++; + struct vt_stat vt; + static char the_console[13]; + + console = the_console; + /* 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( the_console, sizeof the_console, "/dev/ttyS%d", sr.line ); + } + else if (ioctl(0, VT_GETSTATE, &vt) == 0) { + /* this is linux virtual tty */ + snprintf( the_console, sizeof the_console, "/dev/tty%d", vt.v_active ); + } else { + console = DEV_CONSOLE; + tried_devcons++; + } } + while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) { + /* Can't open selected console -- try /dev/console */ if (!tried_devcons) { tried_devcons++; - console = CONSOLE; + console = DEV_CONSOLE; continue; } - if (!tried_vtmaster) { - tried_vtmaster++; + /* Can't open selected console -- try vt1 */ + if (!tried_vtprimary) { + tried_vtprimary++; console = VT_PRIMARY; continue; } break; } if (fd < 0) + /* Perhaps we should panic here? */ console = "/dev/null"; - else + else { + /* check for serial console and disable logging to tty3 & running a + * shell to tty2 */ + if (ioctl(0,TIOCGSERIAL,&sr) == 0) { + log = NULL; + second_console = NULL; + } close(fd); + } + message(LOG, "console=%s\n", console ); } static int waitfor(int pid) { int status, wpid; - message(log, "Waiting for process %d.\n", pid); + message(LOG, "Waiting for process %d.\n", pid); while ((wpid = wait(&status)) != pid) { if (wpid > 0) - message(log, "pid %d exited, status=%x.\n", wpid, status); + message(LOG, "pid %d exited, status=0x%x.\n", wpid, status); } return wpid; } -static int run(const char *command, char *terminal, int get_enter) + +static pid_t run(const char * const* command, + char *terminal, int get_enter) { - int f, pid; - char *args[16]; - char buf[256]; - char *ptr; + int fd; + pid_t pid; + const char * const* cmd = command+1; static const char press_enter[] = "\nPlease press Enter to activate this console. "; - - /* Make a proper command from the command string */ - strcpy(buf, command); - ptr = buf; - for (f = 1; f < 15; f++) { - /* Skip white space */ - while (*ptr == ' ' || *ptr == '\t') - ptr++; - args[f] = ptr; - /* May be trailing space.. */ - if (*ptr == 0) - break; - /* Skip this `word' */ - while (*ptr && *ptr != ' ' && *ptr != '\t' && *ptr != '#') - ptr++; - /* If end-of-line, break */ - if (*ptr == '#' || *ptr == 0) { - f++; - *ptr = 0; - break; - } - /* End word with \0 and continue */ - args[f] = NULL; - } - args[0] = args[1]; - - if ((pid = fork()) == 0) { /* Clean up */ close(0); @@ -248,16 +282,22 @@ static int run(const char *command, char *terminal, int get_enter) close(2); setsid(); - if ((f = device_open(terminal, O_RDWR | O_NOCTTY)) < 0) { - message(log, "open(%s) failed: %s\n", terminal, strerror(errno)); - return -1; + /* Reset signal handlers set for parent process */ + signal(SIGUSR1, SIG_DFL); + signal(SIGUSR2, SIG_DFL); + signal(SIGINT, SIG_DFL); + signal(SIGTERM, SIG_DFL); + + if ((fd = device_open(terminal, O_RDWR)) < 0) { + message(LOG, "Bummer, can't open %s\r\n", terminal); + exit(-1); } - dup(f); - dup(f); + dup(fd); + dup(fd); tcsetpgrp(0, getpgrp()); - set_term(); + set_term(0); - if (get_enter) { + if (get_enter==TRUE) { /* * Save memory by not exec-ing anything large (like a shell) * before the user wants it. This is critical if swap is not @@ -267,59 +307,81 @@ static int run(const char *command, char *terminal, int get_enter) * specifies. */ char c; + message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\r\n", + *cmd, getpid(), terminal ); write(1, press_enter, sizeof(press_enter) - 1); read(0, &c, 1); - message(console, "Got an enter\r\n"); } /* Log the process name and args */ - message(console, "Executing "); - message(console, "'%s'\r\n", command); - - /* Now run it. This should take over the PID, so nothing - * further in init.c should be run by this PID. */ - execvp(args[1], args + 1); - - message(console, "Hmm. Trying as a script.\r\n"); - /* If shell scripts are not executed, force the issue */ - if (errno == ENOEXEC) { - char buf[256]; - args[1] = SHELL; - args[2] = "-c"; - strcpy(buf, "exec "); - strcat(buf, command); - args[3] = buf; - args[4] = NULL; - execvp(args[1], args + 1); - } - message(console, "Could not execute '%s'\n", command); + message(LOG, "Starting pid %d, console %s: '", getpid(), terminal); + while ( *cmd) message(LOG, "%s ", *cmd++); + message(LOG, "'\r\n"); + + /* Now run it. The new program will take over this PID, + * so nothing further in init.c should be run. */ + execvp(*command, (char**)command+1); + + message(LOG, "Bummer, could not run '%s'\n", command); exit(-1); } return pid; } -#ifndef DEBUG_INIT +/* Make sure there is enough memory to do something useful. * + * Calls swapon if needed so be sure /proc is mounted. */ +static void check_memory() +{ + struct stat statbuf; + const char* const swap_on_cmd[] = + { "/bin/swapon", "swapon", "-a", 0}; + + if (mem_total() > 3500) + return; + + if (stat("/etc/fstab", &statbuf) == 0) { + /* Try to turn on swap */ + waitfor(run(swap_on_cmd, log, FALSE)); + if (mem_total() < 3500) + goto goodnight; + } else + goto goodnight; + return; + +goodnight: + message(CONSOLE, "Sorry, your computer does not have enough memory.\r\n"); + while (1) sleep(1); +} + static void shutdown_system(void) { + const char* const swap_off_cmd[] = { "swapoff", "swapoff", "-a", 0}; + const char* const umount_cmd[] = { "umount", "umount", "-a", "-n", 0}; - message(console, "The system is going down NOW !!\r\n"); - sync(); +#ifndef DEBUG_INIT /* Allow Ctrl-Alt-Del to reboot system. */ reboot(RB_ENABLE_CAD); - +#endif + message(CONSOLE, "The system is going down NOW !!\r\n"); + sync(); /* Send signals to every process _except_ pid 1 */ - message(console, "Sending SIGHUP to all processes.\r\n"); + message(CONSOLE, "Sending SIGHUP to all processes.\r\n"); +#ifndef DEBUG_INIT kill(-1, SIGHUP); +#endif sleep(2); sync(); - message(console, "Sending SIGKILL to all processes.\r\n"); + message(CONSOLE, "Sending SIGKILL to all processes.\r\n"); +#ifndef DEBUG_INIT kill(-1, SIGKILL); +#endif sleep(1); - waitfor(run("/bin/swapoff -a", console, 0)); - waitfor(run("/bin/umount -a -n", console, 0)); + waitfor(run( swap_off_cmd, console, FALSE)); + waitfor(run( umount_cmd, console, FALSE)); sync(); - if (get_kernel_revision() <= 2 * 65536 + 2 * 256 + 11) { - /* Removed bdflush call, kupdate in kernels >2.2.11 */ + if (kernel_version > 0 && kernel_version <= 2 * 65536 + 2 * 256 + 11) { + /* bdflush, kupdate not needed for kernels >2.2.11 */ + message(CONSOLE, "Flushing buffers.\r\n"); bdflush(1, 0); sync(); } @@ -328,137 +390,148 @@ static void shutdown_system(void) static void halt_signal(int sig) { shutdown_system(); - message(console, + message(CONSOLE, "The system is halted. Press CTRL-ALT-DEL or turn off power\r\n"); - reboot(RB_POWER_OFF); + sync(); +#ifndef DEBUG_INIT + reboot(RB_HALT_SYSTEM); + //reboot(RB_POWER_OFF); +#endif exit(0); } static void reboot_signal(int sig) { shutdown_system(); - message(console, "Please stand by while rebooting the system.\r\n"); + message(CONSOLE, "Please stand by while rebooting the system.\r\n"); + sync(); +#ifndef DEBUG_INIT reboot(RB_AUTOBOOT); +#endif exit(0); } -#endif - extern int init_main(int argc, char **argv) { int run_rc = TRUE; - int pid1 = 0; - int pid2 = 0; + int wait_for_enter = TRUE; + pid_t pid1 = 0; + pid_t pid2 = 0; struct stat statbuf; - const char *init_commands = SHELL "-c exec " INITSCRIPT; - const char *shell_commands = SHELL; - const char *tty0_commands = init_commands; - const char *tty1_commands = shell_commands; + const char* const rc_script_command[] = { INITSCRIPT, INITSCRIPT, 0}; + const char* const shell_command[] = { SHELL, "-" SHELL, 0}; + const char* const* tty0_command = shell_command; + const char* const* tty1_command = shell_command; +#ifdef BB_CONSOLE_CMD_IF_RC_SCRIPT_EXITS + const char* const rc_exit_command[] = BB_CONSOLE_CMD_IF_RC_SCRIPT_EXITS; +#endif + +#ifdef DEBUG_INIT + char *hello_msg_format = + "init(%d) started: BusyBox v%s (%s) multi-call binary\r\n"; +#else char *hello_msg_format = "init started: BusyBox v%s (%s) multi-call binary\r\n"; - const char *no_memory = - "Sorry, your computer does not have enough memory.\r\n"; - +#endif + #ifndef DEBUG_INIT - /* Set up sig handlers */ + if (getpid() != 1) { + usage( "init\n\nInit is the parent of all processes.\n\n" + "This version of init is designed to be run only by the kernel\n"); + } +#endif + + /* 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"))) { + run_rc = FALSE; + } + + + /* Set up sig handlers -- be sure to + * clear all of these in run() */ signal(SIGUSR1, halt_signal); - signal(SIGSEGV, halt_signal); - signal(SIGPWR, halt_signal); - signal(SIGALRM, halt_signal); - signal(SIGHUP, halt_signal); signal(SIGUSR2, reboot_signal); signal(SIGINT, reboot_signal); signal(SIGTERM, reboot_signal); -#endif - /* Figure out where the default console should be */ - console_init(); /* Turn off rebooting via CTL-ALT-DEL -- we get a * SIGINT on CAD so we can shut things down gracefully... */ #ifndef DEBUG_INIT reboot(RB_DISABLE_CAD); -#endif +#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); - set_term(); + set_term(0); setsid(); /* Make sure PATH is set to something sane */ - if (getenv("PATH") == NULL) - putenv(PATH_DEFAULT); + putenv(PATH_DEFAULT); + /* Hello world */ - message(log, hello_msg_format, BB_VER, BB_BT); - message(console, hello_msg_format, BB_VER, BB_BT); +#ifndef DEBUG_INIT + message(CONSOLE|LOG, hello_msg_format, BB_VER, BB_BT); +#else + message(CONSOLE|LOG, hello_msg_format, getpid(), BB_VER, BB_BT); +#endif + /* Mount /proc */ - if (mount("/proc", "/proc", "proc", 0, 0)) { - message(log, "Mounting /proc: failed!\n"); - message(console, "Mounting /proc: failed!\r\n"); - } else { - message(console, "Mounting /proc: done.\r\n"); - } + if (mount ("proc", "/proc", "proc", 0, 0) == 0) { + message(CONSOLE|LOG, "Mounting /proc: done.\n"); + kernel_version = get_kernel_revision(); + } else + message(CONSOLE|LOG, "Mounting /proc: failed!\n"); - /* Make sure there is enough memory to do something useful */ - set_free_pages(); - if (mem_total() < 2000) { - int retval; - retval = stat("/etc/fstab", &statbuf); - if (retval) { - message(console, "%s", no_memory); - while (1) { - sleep(1); - } - } else { - /* Try to turn on swap */ - waitfor(run("/bin/swapon -a", console, 0)); - if (mem_total() < 2000) { - message(console, "%s", no_memory); - while (1) { - sleep(1); - } - } - } - } + /* Make sure there is enough memory to do something useful. */ + check_memory(); - /* 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"))) { - run_rc = FALSE; - tty0_commands = shell_commands; - tty1_commands = 0; - } /* Make sure an init script exists before trying to run it */ - if (run_rc == TRUE && stat(INITSCRIPT, &statbuf)) { - tty0_commands = shell_commands; - tty1_commands = shell_commands; + if (run_rc == TRUE && stat(INITSCRIPT, &statbuf)==0) { + wait_for_enter = FALSE; + tty0_command = rc_script_command; } + /* Ok, now launch the rc script and/or prepare to * start up some VTs if somebody hits enter... */ for (;;) { - int wpid; + pid_t wpid; int status; - if (pid1 == 0 && tty0_commands) { - pid1 = run(tty0_commands, console, 1); + if (pid1 == 0 && tty0_command) { + pid1 = run(tty0_command, console, wait_for_enter); } - if (pid2 == 0 && tty1_commands) { - pid2 = run(tty1_commands, second_terminal, 1); + if (pid2 == 0 && tty1_command && second_console) { + pid2 = run(tty1_command, second_console, TRUE); } wpid = wait(&status); - if (wpid > 0 && wpid != pid1) { - message(log, "pid %d exited, status=%x.\n", wpid, status); + if (wpid > 0 ) { + message(LOG, "pid %d exited, status=%x.\n", wpid, status); } - /* Don't respawn an init script if it exits */ - if (run_rc == FALSE && wpid == pid1) { - pid1 = 0; + /* Don't respawn init script if it exits */ + if (wpid == pid1) { + if (run_rc == FALSE) { + pid1 = 0; + } +#ifdef BB_CONSOLE_CMD_IF_RC_SCRIPT_EXITS + else { + pid1 = 0; + run_rc=FALSE; + wait_for_enter=TRUE; + tty0_command=rc_exit_command; + } +#endif } if (wpid == pid2) { pid2 = 0;