#include <errno.h>
#include <signal.h>
#include <termios.h>
+#include <paths.h>
#include <sys/types.h>
#include <sys/fcntl.h>
#include <sys/wait.h>
#include <linux/serial.h> /* for serial_struct */
#include <sys/vt.h> /* for vt_stat */
#include <sys/ioctl.h>
+#include <linux/version.h>
+#ifdef BB_SYSLOGD
+#include <sys/syslog.h>
+#endif
+
+#if ! defined BB_FEATURE_USE_PROCFS
+#error Sorry, I depend on the /proc filesystem right now.
+#endif
+
+#ifndef KERNEL_VERSION
+#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
+#endif
+
-#define VT_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 GETTY "/sbin/getty" /* Default location of getty */
#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"
+#ifndef BB_INIT_SCRIPT
+#define BB_INIT_SCRIPT "/etc/init.d/rcS" /* Initscript. */
+#endif
#define LOG 0x1
#define CONSOLE 0x2
-static char *console = VT_CONSOLE;
+static char *console = _PATH_CONSOLE;
static char *second_console = VT_SECONDARY;
static char *log = VT_LOG;
-
+static int kernel_version = 0;
/* try to open up the specified device */
void message(int device, char *fmt, ...)
{
int fd;
- static int log_fd=-1;
va_list arguments;
+#ifdef BB_SYSLOGD
+
+ /* Log the message to syslogd */
+ if (device & LOG ) {
+ char msg[1024];
+ va_start(arguments, fmt);
+ vsnprintf(msg, sizeof(msg), fmt, arguments);
+ va_end(arguments);
+ syslog(LOG_DAEMON|LOG_NOTICE, msg);
+ }
+
+#else
+ static int log_fd=-1;
/* Take full control of the log tty, and never close it.
* It's mine, all mine! Muhahahaha! */
- if (log_fd==-1) {
- if ((log_fd = device_open(log, O_RDWR|O_NDELAY)) < 0) {
+ 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 != -1) ) {
+ if ( (device & LOG) && (log_fd >= 0) ) {
va_start(arguments, fmt);
vdprintf(log_fd, fmt, arguments);
va_end(arguments);
}
+#endif
+
if (device & CONSOLE) {
- if ((fd = device_open(console, O_WRONLY|O_NOCTTY|O_NDELAY)) >= 0) {
+ /* Always send console messages to /dev/console so people will see them. */
+ if ((fd = device_open(_PATH_CONSOLE, O_WRONLY|O_NOCTTY|O_NDELAY)) >= 0) {
va_start(arguments, fmt);
vdprintf(fd, fmt, arguments);
va_end(arguments);
void set_term( int fd)
{
struct termios tty;
-#if 0
static const char control_characters[] = {
'\003', '\034', '\177', '\025', '\004', '\0',
'\1', '\0', '\021', '\023', '\032', '\0', '\022',
'\017', '\027', '\026', '\0'
};
-#endif
- static const char control_characters[] = {
- '\003', '\034', '\177', '\030', '\004', '\0',
- '\1', '\0', '\021', '\023', '\032', '\0', '\022',
- '\017', '\027', '\026', '\0'
- };
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;
+ /* set control chars */
+ memcpy(tty.c_cc, control_characters, sizeof(control_characters));
/* use line dicipline 0 */
tty.c_line = 0;
+ /* Make it be sane */
+ //tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
+ //tty.c_cflag |= HUPCL|CLOCAL;
+
+ /* input modes */
+ tty.c_iflag = ICRNL|IXON|IXOFF;
+
/* 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));
+ tty.c_lflag = ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOKE|IEXTEN;
tcsetattr(fd, TCSANOW, &tty);
}
-/* Set terminal settings to reasonable defaults */
-void set_term_old( int fd)
-{
- struct termios tty;
-
- ioctl(fd, TCGETA, &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] = 21;
- tty.c_cc[VKILL] = 24;
- tty.c_cc[VEOF] = 4;
- tty.c_cc[VTIME] = 0;
- tty.c_cc[VMIN] = 1;
- tty.c_cc[VSWTC] = 0;
- tty.c_cc[VSTART] = 17;
- tty.c_cc[VSTOP] = 19;
- tty.c_cc[VSUSP] = 26;
- tty.c_cc[VEOL] = 0;
- tty.c_cc[VREPRINT] = 18;
- tty.c_cc[VDISCARD] = 15;
- tty.c_cc[VWERASE] = 23;
- tty.c_cc[VLNEXT] = 22;
- tty.c_cc[VEOL2] = 0;
-
-
- tty.c_line = 0;
- tty.c_iflag = IGNPAR|ICRNL|IXON|IXOFF|IXANY;
- tty.c_oflag = OPOST|ONLCR;
- tty.c_lflag = ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOPRT|ECHOKE|IEXTEN;
-
- ioctl(fd, TCSETA, &tty);
-}
-
/* How much memory does this machine have? */
static int mem_total()
{
int fd;
int tried_devcons = 0;
int tried_vtprimary = 0;
+ struct serial_struct sr;
char *s;
if ((s = getenv("CONSOLE")) != NULL) {
console = s;
-/* Apparently the sparc does wierd things... */
-#if defined (__sparc__)
- if (strncmp( s, "/dev/tty", 8 )==0) {
- switch( s[8]) {
- case 'a':
- s=SERIAL_CON0;
- break;
- case 'b':
- s=SERIAL_CON1;
- }
- }
+ }
+#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 = VT_CONSOLE;
- tried_devcons++;
+ else {
+ 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 = _PATH_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 = VT_CONSOLE;
+ console = _PATH_CONSOLE;
continue;
}
/* Can't open selected console -- try vt1 */
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) {
+ message(LOG|CONSOLE, "serial console detected. Disabling 2nd virtual terminal.\r\n", console );
+ log = NULL;
+ second_console = NULL;
+ }
close(fd);
+ }
message(LOG, "console=%s\n", console );
}
}
/* Log the process name and args */
- message(LOG, "Starting pid %d, console %s: '", getpid(), terminal);
- while ( *cmd) message(LOG, "%s ", *cmd++);
- message(LOG, "'\r\n");
+ message(LOG|CONSOLE, "Starting pid %d, console %s: '", getpid(), terminal);
+ while ( *cmd) message(LOG|CONSOLE, "%s ", *cmd++);
+ message(LOG|CONSOLE, "'\r\n");
/* Now run it. The new program will take over this PID,
* so nothing further in init.c should be run. */
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};
+ const char* const umount_cmd[] = { "umount", "umount", "-a", 0};
#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");
+ message(CONSOLE, "\r\nThe 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");
kill(-1, SIGKILL);
#endif
sleep(1);
+ message(CONSOLE, "Disabling swap.\r\n");
waitfor(run( swap_off_cmd, console, FALSE));
+ message(CONSOLE, "Unmounting filesystems.\r\n");
waitfor(run( umount_cmd, console, FALSE));
sync();
- bdflush(1, 0);
+ 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)
"The system is halted. Press CTRL-ALT-DEL or turn off power\r\n");
sync();
#ifndef DEBUG_INIT
- reboot(RB_HALT_SYSTEM);
- //reboot(RB_POWER_OFF);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
+ if (sig == SIGUSR2)
+ reboot(RB_POWER_OFF);
+ else
+#endif
+ reboot(RB_HALT_SYSTEM);
#endif
exit(0);
}
extern int init_main(int argc, char **argv)
{
- int run_rc = TRUE;
- int wait_for_enter = TRUE;
+ int run_rc = FALSE;
+ int single = FALSE;
+ int wait_for_enter_tty1 = TRUE;
+ int wait_for_enter_tty2 = TRUE;
pid_t pid1 = 0;
pid_t pid2 = 0;
struct stat statbuf;
- const char* const init_commands[] = { INITSCRIPT, INITSCRIPT, 0};
- const char* const shell_commands[] = { SHELL, "-" SHELL, 0};
- const char* const* tty0_commands = shell_commands;
- const char* const* tty1_commands = shell_commands;
+ char which_vt1[30];
+ char which_vt2[30];
+ const char* const rc_script_command[] = { BB_INIT_SCRIPT, BB_INIT_SCRIPT, 0};
+ const char* const getty1_command[] = { GETTY, GETTY, "38400", which_vt1, 0};
+ const char* const getty2_command[] = { GETTY, GETTY, "38400", which_vt2, 0};
+ const char* const shell_command[] = { SHELL, "-" SHELL, 0};
+ const char* const* tty1_command = shell_command;
+ const char* const* tty2_command = shell_command;
+#ifdef BB_INIT_CMD_IF_RC_SCRIPT_EXITS
+ const char* const rc_exit_command[] = { "BB_INIT_CMD_IF_RC_SCRIPT_EXITS",
+ "BB_INIT_CMD_IF_RC_SCRIPT_EXITS", 0 };
+#endif
+
#ifdef DEBUG_INIT
char *hello_msg_format =
"init(%d) started: BusyBox v%s (%s) multi-call binary\r\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;
+#ifndef DEBUG_INIT
+ /* Expect to be PID 1 iff we are run as init (not linuxrc) */
+ if (getpid() != 1 && strstr(argv[0], "init")!=NULL ) {
+ 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
-
/* Set up sig handlers -- be sure to
* clear all of these in run() */
signal(SIGUSR1, halt_signal);
setsid();
/* Make sure PATH is set to something sane */
- putenv(PATH_DEFAULT);
+ putenv(_PATH_STDPATH);
/* Hello world */
/* Mount /proc */
- if (mount ("proc", "/proc", "proc", 0, 0) == 0)
+ if (mount ("proc", "/proc", "proc", 0, 0) == 0) {
message(CONSOLE|LOG, "Mounting /proc: done.\n");
- else
+ kernel_version = get_kernel_revision();
+ } else
message(CONSOLE|LOG, "Mounting /proc: failed!\n");
/* 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"))) {
+ single = TRUE;
+ tty1_command = shell_command;
+ tty2_command = shell_command;
+ }
/* Make sure an init script exists before trying to run it */
- if (run_rc == TRUE && stat(INITSCRIPT, &statbuf)==0) {
- wait_for_enter = FALSE;
- tty0_commands = init_commands;
+ if (single==FALSE && stat(BB_INIT_SCRIPT, &statbuf)==0) {
+ run_rc = TRUE;
+ wait_for_enter_tty1 = FALSE;
+ tty1_command = rc_script_command;
}
+
+ /* Make sure /sbin/getty exists before trying to run it */
+ if (stat(GETTY, &statbuf)==0) {
+ char* where;
+ /* First do tty2 */
+ wait_for_enter_tty2 = FALSE;
+ where = strrchr( second_console, '/');
+ if ( where != NULL) {
+ where++;
+ strncpy( which_vt2, where, sizeof(which_vt2));
+ }
+ tty2_command = getty2_command;
+
+ /* Check on hooking a getty onto tty1 */
+ if (run_rc == FALSE && single==FALSE) {
+ wait_for_enter_tty1 = FALSE;
+ where = strrchr( console, '/');
+ if ( where != NULL) {
+ where++;
+ strncpy( which_vt1, where, sizeof(which_vt1));
+ }
+ tty1_command = getty1_command;
+ }
+ }
+
-
- /* Ok, now launch the rc script and/or prepare to
- * start up some VTs if somebody hits enter...
- */
+ /* Ok, now launch the tty1_command and tty2_command */
for (;;) {
pid_t wpid;
int status;
- if (pid1 == 0 && tty0_commands) {
- pid1 = run(tty0_commands, console, wait_for_enter);
+ if (pid1 == 0 && tty1_command) {
+ pid1 = run(tty1_command, console, wait_for_enter_tty1);
}
- if (pid2 == 0 && tty1_commands) {
- pid2 = run(tty1_commands, second_console, TRUE);
+#ifdef BB_FEATURE_INIT_SECOND_CONSOLE
+ if (pid2 == 0 && tty2_command && second_console) {
+ pid2 = run(tty2_command, second_console, wait_for_enter_tty2);
}
+#endif
wpid = wait(&status);
if (wpid > 0 ) {
message(LOG, "pid %d exited, status=%x.\n", wpid, status);
}
+ /* Don't respawn init script if it exits */
if (wpid == pid1) {
- pid1 = 0;
- if (run_rc == TRUE) {
- /* Don't respawn init script if it exits,
- * Start a shell instead. */
+ if (run_rc == FALSE) {
+ pid1 = 0;
+ }
+#ifdef BB_INIT_CMD_IF_RC_SCRIPT_EXITS
+ else {
+ pid1 = 0;
run_rc=FALSE;
- wait_for_enter=TRUE;
- tty0_commands=shell_commands;
+ wait_for_enter_tty1=TRUE;
+ tty1_command=rc_exit_command;
}
+#endif
}
+#ifdef BB_FEATURE_INIT_SECOND_CONSOLE
if (wpid == pid2) {
pid2 = 0;
}
+#endif
sleep(1);
}
}
projects / oweals / busybox.git / blobdiff