#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 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 */
{
int m, f, fd = -1;
- mode = m | O_NONBLOCK;
+ m = mode | O_NONBLOCK;
/* Retry up to 5 times */
for (f = 0; f < 5; f++)
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) {
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);
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
* 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();
}
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;
projects / oweals / busybox.git / blobdiff