diff options
Diffstat (limited to 'init.c')
| -rw-r--r-- | init.c | 406 |
1 files changed, 194 insertions, 212 deletions
@@ -37,40 +37,39 @@ #include <sys/reboot.h> #include <sys/kdaemon.h> #include <sys/sysmacros.h> -#include <linux/serial.h> /* for serial_struct */ -#include <sys/vt.h> /* for vt_stat */ +#include <linux/serial.h> /* for serial_struct */ +#include <sys/vt.h> /* for vt_stat */ #include <sys/ioctl.h> #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 SHELL "/bin/sh" /* Default shell */ -#define INITSCRIPT "/etc/init.d/rcS" /* Initscript. */ +#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 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 int maxproclen=0; -static char* argv0; - -static char* console = CONSOLE; -static char* second_terminal = "/dev/tty2"; -static char* log = "/dev/tty3"; +static char *console = CONSOLE; +static char *second_terminal = "/dev/tty2"; +static char *log = "/dev/tty3"; /* try to open up the specified device */ -int device_open(char* device, int mode) +int device_open(char *device, int mode) { int m, f, fd = -1; - + mode = m | O_NONBLOCK; - + /* Retry up to 5 times */ - for(f = 0; f < 5; f++) - if ((fd = open(device, m)) >= 0) break; - if (fd < 0) return fd; + for (f = 0; f < 5; f++) + if ((fd = open(device, m)) >= 0) + break; + if (fd < 0) + return fd; /* Set original flags. */ if (m != mode) fcntl(fd, F_SETFL, mode); @@ -78,16 +77,18 @@ int device_open(char* device, int mode) } /* print a message to the specified device */ -void message(char* device, char *fmt, ...) +void message(char *device, char *fmt, ...) { int fd; va_list arguments; - if ((fd = device_open(device, O_WRONLY|O_NOCTTY|O_NDELAY)) >= 0) { + + if ((fd = device_open(device, O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) { va_start(arguments, fmt); vdprintf(fd, fmt, arguments); va_end(arguments); - } - close( fd); + close(fd); + } else + vprintf(fmt, arguments); } /* Set terminal settings to reasonable defaults */ @@ -96,74 +97,71 @@ void set_term() int fd; struct termios tty; - if ((fd = device_open(console, O_RDWR|O_NOCTTY)) < 0) { - message(log, "can't open %s", console); + 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_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[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[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; + 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; + 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); + close(fd); } -static int -mem_total() +static int mem_total() { char s[80]; char *p; FILE *f; - const char pattern[]="MemTotal:"; + const char pattern[] = "MemTotal:"; - f=fopen("/proc/meminfo","r"); - while (NULL != fgets(s,79,f)) { - p=strstr(s, pattern); + f = fopen("/proc/meminfo", "r"); + while (NULL != fgets(s, 79, f)) { + p = strstr(s, pattern); if (NULL != p) { fclose(f); - return(atoi(p+strlen(pattern))); + return (atoi(p + strlen(pattern))); } } return -1; } -static void -set_free_pages() +static void set_free_pages() { char s[80]; FILE *f; - f=fopen("/proc/sys/vm/freepages","r"); - fgets(s,79,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"); + 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() +static void console_init() { int fd; int tried_devcons = 0; @@ -176,7 +174,7 @@ console_init() console = CONSOLE; tried_devcons++; } - while ((fd = open(console, O_RDONLY|O_NONBLOCK)) < 0) { + while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) { if (!tried_devcons) { tried_devcons++; console = CONSOLE; @@ -195,41 +193,41 @@ console_init() close(fd); } -static int -waitfor(int pid) +static int waitfor(int pid) { int status, wpid; 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); + while ((wpid = wait(&status)) != pid) { + if (wpid > 0) + message(log, "pid %d exited, status=%x.\n", wpid, status); } return wpid; } -static int -run(const char* command, char* terminal, int get_enter) +static int run(const char *command, char *terminal, int get_enter) { - int f, pid; + int f, pid; char *args[16]; char buf[256]; - char* ptr; - static const char press_enter[] = + char *ptr; + static const char press_enter[] = "\nPlease press Enter to activate this console. "; - - /* Make a proper command from the command string */ + + /* Make a proper command from the command string */ strcpy(buf, command); ptr = buf; - for(f = 1; f < 15; f++) { + for (f = 1; f < 15; f++) { /* Skip white space */ - while(*ptr == ' ' || *ptr == '\t') ptr++; + while (*ptr == ' ' || *ptr == '\t') + ptr++; args[f] = ptr; /* May be trailing space.. */ - if (*ptr == 0) break; + if (*ptr == 0) + break; /* Skip this `word' */ - while(*ptr && *ptr != ' ' && *ptr != '\t' && *ptr != '#') + while (*ptr && *ptr != ' ' && *ptr != '\t' && *ptr != '#') ptr++; /* If end-of-line, break */ if (*ptr == '#' || *ptr == 0) { @@ -241,7 +239,7 @@ run(const char* command, char* terminal, int get_enter) args[f] = NULL; } args[0] = args[1]; - + if ((pid = fork()) == 0) { /* Clean up */ @@ -250,8 +248,8 @@ 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", terminal, strerror(errno)); + if ((f = device_open(terminal, O_RDWR | O_NOCTTY)) < 0) { + message(log, "open(%s) failed: %s\n", terminal, strerror(errno)); return -1; } dup(f); @@ -259,7 +257,7 @@ run(const char* command, char* terminal, int get_enter) tcsetpgrp(0, getpgrp()); set_term(); - if ( get_enter ) { + if (get_enter) { /* * Save memory by not exec-ing anything large (like a shell) * before the user wants it. This is critical if swap is not @@ -268,18 +266,21 @@ run(const char* command, char* terminal, int get_enter) * be allowed to start a shell or whatever an init script * specifies. */ - char c; + char c; 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(log, "Executing '%s'\n", command); + 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]; @@ -291,18 +292,17 @@ run(const char* command, char* terminal, int get_enter) args[4] = NULL; execvp(args[1], args + 1); } - message(log, "Could not execute '%s'\n", command, strerror(errno)); + message(console, "Could not execute '%s'\n", command); exit(-1); } return pid; } #ifndef DEBUG_INIT -static void -shutdown_system(void) +static void shutdown_system(void) { - message(console, "The system is going down NOW !!"); + message(console, "The system is going down NOW !!\r\n"); sync(); /* Allow Ctrl-Alt-Del to reboot system. */ reboot(RB_ENABLE_CAD); @@ -318,169 +318,151 @@ shutdown_system(void) waitfor(run("/bin/swapoff -a", console, 0)); waitfor(run("/bin/umount -a -n", console, 0)); sync(); - if (get_kernel_revision() <= 2*65536+2*256+11) { + if (get_kernel_revision() <= 2 * 65536 + 2 * 256 + 11) { /* Removed bdflush call, kupdate in kernels >2.2.11 */ bdflush(1, 0); sync(); } } -static void -halt_signal(int sig) +static void halt_signal(int sig) { shutdown_system(); - message(console, "The system is halted. Press CTRL-ALT-DEL or turn off power\r\n"); - reboot( RB_POWER_OFF); + message(console, + "The system is halted. Press CTRL-ALT-DEL or turn off power\r\n"); + reboot(RB_POWER_OFF); exit(0); } -static void -reboot_signal(int sig) +static void reboot_signal(int sig) { shutdown_system(); message(console, "Please stand by while rebooting the system.\r\n"); - reboot( RB_AUTOBOOT); + reboot(RB_AUTOBOOT); exit(0); } -#endif -int setproctitle(char *fmt, ...) -{ - va_list ap; - int len; - char buf[256]; - - buf[0] = 0; - va_start(ap, fmt); - len = vsprintf(buf, fmt, ap); - va_end(ap); - memset(argv0, 0, maxproclen + 1); - strncpy(argv0, buf, maxproclen); - return len; -} +#endif -extern int -init_main(int argc, char * * argv) +extern int init_main(int argc, char **argv) { - int run_rc = TRUE; - int pid1 = 0; - int 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* no_memory = - "Sorry, your computer does not have enough memory.\n"; - - /* For later use */ - argv0 = argv[0]; - maxproclen = strlen(argv[0]); - setproctitle("init [boot]"); + int run_rc = TRUE; + int pid1 = 0; + int 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; + 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"; #ifndef DEBUG_INIT - /* Set up sig handlers */ - 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); + /* Set up sig handlers */ + 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(); + /* 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... */ + /* 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); + reboot(RB_DISABLE_CAD); #endif - /* Close whatever files are open, and reset the console. */ - close(0); - close(1); - close(2); - set_term(); - setsid(); - - /* Make sure PATH is set to something sane */ - if (getenv("PATH") == NULL) - putenv(PATH_DEFAULT); - - /* Hello world */ - message(console, "%s started: BusyBox v%s (%s) multi-call binary", - argv[0], BB_VER, BB_BT); - message(log, "%s started: BusyBox v%s (%s) multi-call binary", - argv[0], BB_VER, BB_BT); - - - /* Mount /proc */ - message(console, "Mounting /proc: \n"); - if (mount("/proc","/proc","proc",0,0)) { - message(log, "%s: could not mount /proc!\n", argv[0]); - message(console, "failed!\n"); - } - message(console, "done.\n"); - + /* Close whatever files are open, and reset the console. */ + close(0); + close(1); + close(2); + set_term(); + setsid(); + + /* Make sure PATH is set to something sane */ + if (getenv("PATH") == NULL) + putenv(PATH_DEFAULT); + + /* Hello world */ + message(log, hello_msg_format, BB_VER, BB_BT); + message(console, hello_msg_format, BB_VER, BB_BT); + + /* 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"); + } - /* 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) { + /* 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);} - } 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);} + while (1) { + sleep(1); } } } + } - /* Check if we are supposed to be in single user mode */ - if (!strcmp(argv[1], "single") || !strcmp(argv[1], "-s") || !strcmp(argv[1], "1")) { - run_rc = FALSE; - tty0_commands = shell_commands; - tty1_commands = 0; - setproctitle("init [S]"); - } else { - setproctitle("init [1]"); - } + /* 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; - } - - /* Ok, now launch the rc script and/or prepare to - * start up some VTs if somebody hits enter... - */ - for ( ; ; ) { - int wpid; - int status; - - if ( pid1 == 0 && *tty0_commands ) { - pid1 = run(tty0_commands, console, 1); - } - if ( pid2 == 0 && *tty1_commands ) { - pid2 = run(tty1_commands, second_terminal, 1); - } - wpid = wait(&status); - if ( wpid > 0 && wpid != pid1) { - message(log, "pid %d exited, status=%x.\n", wpid, status); - } - if ( wpid == pid2 ) { - pid2 = 0; - } - sleep(1); + /* 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; + } + + /* Ok, now launch the rc script and/or prepare to + * start up some VTs if somebody hits enter... + */ + for (;;) { + int wpid; + int status; + + if (pid1 == 0 && tty0_commands) { + pid1 = run(tty0_commands, console, 1); } + if (pid2 == 0 && tty1_commands) { + pid2 = run(tty1_commands, second_terminal, 1); + } + wpid = wait(&status); + if (wpid > 0 && wpid != pid1) { + 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; + } + if (wpid == pid2) { + pid2 = 0; + } + sleep(1); + } } - |