#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 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 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";
-
+#define LOG 0x1
+#define CONSOLE 0x2
+static char *console = VT_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 device_open(char* device, int mode)
+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++)
- if ((fd = open(device, m)) >= 0) break;
- if (fd < 0) return fd;
- /* Set original flags. */
+ for (f = 0; f < 5; f++)
+ if ((fd = open(device, m)) >= 0)
+ break;
+ if (fd < 0)
+ return fd;
+ /* 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==-1) {
+ 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) ) {
va_start(arguments, fmt);
- vdprintf(fd, fmt, arguments);
+ vdprintf(log_fd, fmt, arguments);
va_end(arguments);
}
- close( fd);
+ if (device & CONSOLE) {
+ if ((fd = device_open(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", console);
- return;
- }
- ioctl(fd, TCGETS, &tty);
+ tcgetattr(fd, &tty);
+
+ /* Make it be sane */
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;
+ /* 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;
- tty.c_lflag = ISIG|ICANON|ECHO|ECHOCTL|ECHOPRT|ECHOKE;
- /* Now set the terminal line. */
- ioctl(fd, TCSETS, &tty);
- close( fd);
+ /* 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);
}
-static int
-mem_total()
+/* 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:";
+ const char pattern[] = "MemTotal:";
- f=fopen("/proc/meminfo","r");
- while (NULL != fgets(s,79,f)) {
- p=strstr(s, pattern);
+ 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) {
fclose(f);
- return(atoi(p+strlen(pattern)));
+ return (atoi(p + strlen(pattern)));
}
}
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()
+static void console_init()
{
int fd;
int tried_devcons = 0;
- int tried_vtmaster = 0;
+ int tried_vtprimary = 0;
char *s;
- if ((s = getenv("CONSOLE")) != NULL)
+ if ((s = getenv("CONSOLE")) != NULL) {
console = s;
- else {
- console = CONSOLE;
+/* 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;
+ }
+ }
+#endif
+ } else {
+ console = VT_CONSOLE;
tried_devcons++;
}
- while ((fd = open(console, O_RDONLY|O_NONBLOCK)) < 0) {
+
+ 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 = VT_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
close(fd);
+ message(LOG, "console=%s\n", console );
}
-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);
+ message(LOG, "Waiting for process %d.\n", pid);
+ while ((wpid = wait(&status)) != pid) {
+ if (wpid > 0)
+ 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;
- static const char press_enter[] =
+ 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", 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
* be allowed to start a shell or whatever an init script
* specifies.
*/
- char c;
+ 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);
}
/* Log the process name and args */
- message(log, "Executing '%s'\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);
-
- /* 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(log, "Could not execute '%s'\n", command, strerror(errno));
+ 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
-static void
-shutdown_system(void)
+/* 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};
- message(console, "The system is going down NOW !!");
- sync();
+ 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};
+
+#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)
+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");
+ sync();
+#ifndef DEBUG_INIT
+ reboot(RB_HALT_SYSTEM);
+ //reboot(RB_POWER_OFF);
+#endif
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);
- exit(0);
-}
+ message(CONSOLE, "Please stand by while rebooting the system.\r\n");
+ sync();
+#ifndef DEBUG_INIT
+ reboot(RB_AUTOBOOT);
#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;
+ exit(0);
}
-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 wait_for_enter = 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;
+#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";
+#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(SIGUSR2, reboot_signal);
+ signal(SIGINT, reboot_signal);
+ signal(SIGTERM, reboot_signal);
+
+ /* Turn off rebooting via CTL-ALT-DEL -- we get a
+ * SIGINT on CAD so we can shut things down gracefully... */
#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);
-#endif
- /* Figure out where the default console should be */
- console_init();
+ reboot(RB_DISABLE_CAD);
+#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... */
+ /* Close whatever files are open, and reset the console. */
+ close(0);
+ close(1);
+ close(2);
+ set_term(0);
+ setsid();
+
+ /* Make sure PATH is set to something sane */
+ putenv(PATH_DEFAULT);
+
+
+ /* Hello world */
#ifndef DEBUG_INIT
- reboot(RB_DISABLE_CAD);
+ message(CONSOLE|LOG, hello_msg_format, BB_VER, BB_BT);
+#else
+ message(CONSOLE|LOG, hello_msg_format, getpid(), BB_VER, BB_BT);
#endif
- /* Close whatever files are open, and reset the console. */
- close(0);
- close(1);
- close(2);
- set_term();
- setsid();
+
+ /* Mount /proc */
+ 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. */
+ check_memory();
+
- /* Make sure PATH is set to something sane */
- if (getenv("PATH") == NULL)
- putenv(PATH_DEFAULT);
+ /* 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;
+ }
- /* 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);
+ /* Ok, now launch the rc script and/or prepare to
+ * start up some VTs if somebody hits enter...
+ */
+ for (;;) {
+ pid_t wpid;
+ int status;
- /* 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");
+ if (pid1 == 0 && tty0_commands) {
+ pid1 = run(tty0_commands, console, wait_for_enter);
}
- message(console, "done.\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);}
- }
- }
+ if (pid2 == 0 && tty1_commands) {
+ pid2 = run(tty1_commands, second_console, TRUE);
}
-
- /* 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]");
+ wpid = wait(&status);
+ if (wpid > 0 ) {
+ message(LOG, "pid %d exited, status=%x.\n", wpid, status);
}
-
- /* 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);
+ /* Don't respawn init script if it exits */
+ if (wpid == pid1) {
+ if (run_rc == FALSE) {
+ pid1 = 0;
+ }
+#if 0
+/* Turn this on to start a shell on the console if the init script exits.... */
+ else {
+ run_rc=FALSE;
+ wait_for_enter=TRUE;
+ tty0_commands=shell_commands;
+ }
+#endif
}
+ if (wpid == pid2) {
+ pid2 = 0;
+ }
+ sleep(1);
+ }
}
-
projects / oweals / busybox.git / blobdiff