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-rw-r--r--init/init.c628
1 files changed, 321 insertions, 307 deletions
diff --git a/init/init.c b/init/init.c
index c32124d..0676bf7 100644
--- a/init/init.c
+++ b/init/init.c
@@ -41,144 +41,88 @@
#include <sys/vt.h> /* for vt_stat */
#include <sys/ioctl.h>
-static const char init_usage[] = "Used internally by the system.";
-static char console[16] = "";
-static const char* default_console = "/dev/tty2";
-static char* first_terminal = NULL;
-static const char* second_terminal = "/dev/tty2";
-static const char* log = "/dev/tty3";
-static char* term_ptr = NULL;
+#define DEBUG_INIT
-static void
-message(const char* terminal, const char * pattern, ...)
-{
- int fd;
- FILE * con = 0;
- va_list arguments;
-
- /*
- * Open the console device each time a message is printed. If the user
- * has switched consoles, the open will get the new console. If we kept
- * the console open, we'd always print to the same one.
- */
- if ( !terminal
- || ((fd = open(terminal, O_WRONLY|O_NOCTTY)) < 0)
- || ((con = fdopen(fd, "w")) == NULL) )
- return;
+#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"
- va_start(arguments, pattern);
- vfprintf(con, pattern, arguments);
- va_end(arguments);
- fclose(con);
+static int maxproclen=0;
+static char* argv0;
+
+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 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;
+ /* Set original flags. */
+ if (m != mode)
+ fcntl(fd, F_SETFL, mode);
+ return fd;
}
-static int
-waitfor(int pid)
+/* print a message to the specified device */
+void message(char* device, char *fmt, ...)
{
- int status;
- int 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);
- }
- }
- return wpid;
+ int fd;
+ va_list arguments;
+ 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);
}
-static int
-run(const char* program, const char* const* arguments,
- const char* terminal, int get_enter)
+/* Set terminal settings to reasonable defaults */
+void set_term()
{
- static const char control_characters[] = {
- '\003',
- '\034',
- '\177',
- '\025',
- '\004',
- '\0',
- '\1',
- '\0',
- '\021',
- '\023',
- '\032',
- '\0',
- '\022',
- '\017',
- '\027',
- '\026',
- '\0'
- };
-
- static char * environment[] = {
- "HOME=/",
- "PATH=/bin:/sbin:/usr/bin:/usr/sbin",
- "SHELL=/bin/sh",
- 0,
- "USER=root",
- 0
- };
-
- static const char press_enter[] =
- "\nPlease press Enter to activate this console. ";
-
- int pid;
-
- environment[3]=term_ptr;
-
- pid = fork();
- if ( pid == 0 ) {
- struct termios t;
- const char * const * arg;
-
- close(0);
- close(1);
- close(2);
- setsid();
-
- open(terminal, O_RDWR);
- dup(0);
- dup(0);
- tcsetpgrp(0, getpgrp());
-
- tcgetattr(0, &t);
- memcpy(t.c_cc, control_characters, sizeof(control_characters));
- t.c_line = 0;
- t.c_iflag = ICRNL|IXON|IXOFF;
- t.c_oflag = OPOST|ONLCR;
- t.c_lflag = ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOKE|IEXTEN;
- tcsetattr(0, TCSANOW, &t);
-
- 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
- * enabled and the system has low memory. Generally this will
- * be run on the second virtual console, and the first will
- * be allowed to start a shell or whatever an init script
- * specifies.
- */
- char c;
- write(1, press_enter, sizeof(press_enter) - 1);
- read(0, &c, 1);
- }
-
- message(log, "Executing ");
- arg = arguments;
- while ( *arg != 0 )
- message(log, "%s ", *arg++);
- message(log, "\n");
-
- execve(program, (char * *)arguments, (char * *)environment);
- message(log, "%s: could not execute: %s.\r\n", program, strerror(errno));
- exit(-1);
- }
- return pid;
+ int fd;
+ struct termios tty;
+
+ if ((fd = device_open(console, O_RDWR|O_NOCTTY)) < 0) {
+ message(log, "can't open %s", 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);
}
static int
@@ -217,33 +161,168 @@ set_free_pages()
fclose(f);
}
+
static void
-shutdown_system(void)
+console_init()
{
- static const char * const umount_args[] = {"/bin/umount", "-a", "-n", 0};
- static const char * const swapoff_args[] = {"/bin/swapoff", "-a", 0};
+ int fd;
+ int tried_devcons = 0;
+ int tried_vtmaster = 0;
+ char *s;
+
+ if ((s = getenv("CONSOLE")) != NULL)
+ console = s;
+ else {
+ console = CONSOLE;
+ tried_devcons++;
+ }
+ while ((fd = open(console, O_RDONLY|O_NONBLOCK)) < 0) {
+ if (!tried_devcons) {
+ tried_devcons++;
+ console = CONSOLE;
+ continue;
+ }
+ if (!tried_vtmaster) {
+ tried_vtmaster++;
+ console = VT_PRIMARY;
+ continue;
+ }
+ break;
+ }
+ if (fd < 0)
+ console = "/dev/null";
+ else
+ close(fd);
+}
- message(console, "The system is going down NOW !!");
- sync();
- /* Allow Ctrl-Alt-Del to reboot system. */
- reboot(RB_ENABLE_CAD);
+static int
+waitfor(int pid)
+{
+ int status, wpid;
- /* Send signals to every process _except_ pid 1 */
- message(console, "Sending SIGHUP to all processes.\r\n");
- kill(-1, SIGHUP);
- sleep(2);
- sync();
- message(console, "Sending SIGKILL to all processes.\r\n");
- kill(-1, SIGKILL);
- sleep(1);
- waitfor(run("/bin/swapoff", swapoff_args, console, 0));
- waitfor(run("/bin/umount", umount_args, console, 0));
- sync();
- if (get_kernel_revision() <= 2*65536+2*256+11) {
- /* Removed bdflush call, kupdate in kernels >2.2.11 */
- bdflush(1, 0);
- sync();
+ 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);
+ }
+ return wpid;
+}
+
+static int
+run(const char* command, char* terminal, int get_enter)
+{
+ int f, pid;
+ char *args[16];
+ char buf[256];
+ char* ptr;
+ 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(1);
+ close(2);
+ setsid();
+
+ if ((f = device_open(terminal, O_RDWR|O_NOCTTY)) < 0) {
+ message( log, "open(%s) failed: %s", terminal, strerror(errno));
+ return -1;
+ }
+ dup(f);
+ dup(f);
+ tcsetpgrp(0, getpgrp());
+ set_term();
+
+ 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
+ * enabled and the system has low memory. Generally this will
+ * be run on the second virtual console, and the first will
+ * be allowed to start a shell or whatever an init script
+ * specifies.
+ */
+ char c;
+ 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));
+ exit(-1);
+ }
+ return pid;
+}
+
+#ifndef DEBUG_INIT
+static void
+shutdown_system(void)
+{
+
+ message(console, "The system is going down NOW !!");
+ sync();
+ /* Allow Ctrl-Alt-Del to reboot system. */
+ reboot(RB_ENABLE_CAD);
+
+ /* Send signals to every process _except_ pid 1 */
+ message(console, "Sending SIGHUP to all processes.\r\n");
+ kill(-1, SIGHUP);
+ sleep(2);
+ sync();
+ message(console, "Sending SIGKILL to all processes.\r\n");
+ kill(-1, SIGKILL);
+ sleep(1);
+ 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) {
+ /* Removed bdflush call, kupdate in kernels >2.2.11 */
+ bdflush(1, 0);
+ sync();
+ }
}
static void
@@ -251,7 +330,7 @@ halt_signal(int sig)
{
shutdown_system();
message(console, "The system is halted. Press CTRL-ALT-DEL or turn off power\r\n");
- reboot( RB_HALT_SYSTEM);
+ reboot( RB_POWER_OFF);
exit(0);
}
@@ -263,202 +342,136 @@ reboot_signal(int sig)
reboot( RB_AUTOBOOT);
exit(0);
}
+#endif
-static void
-configure_terminals( int serial_cons, int single_user_mode )
+int setproctitle(char *fmt, ...)
{
- char *tty;
- struct serial_struct sr;
- struct vt_stat vt;
-
-
- switch (serial_cons) {
- case -1:
- /* 2.2 kernels:
- * identify the real console backend and try to make use of it */
- if (ioctl(0,TIOCGSERIAL,&sr) == 0) {
- sprintf( console, "/dev/ttyS%d", sr.line );
- serial_cons = sr.line+1;
- }
- else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
- sprintf( console, "/dev/tty%d", vt.v_active );
- serial_cons = 0;
- }
- else {
- /* unknown backend: fallback to /dev/console */
- strcpy( console, "/dev/console" );
- serial_cons = 0;
- }
- break;
-
- case 1:
- strcpy( console, "/dev/cua0" );
- break;
- case 2:
- strcpy( console, "/dev/cua1" );
- break;
- default:
- tty = ttyname(0);
- if (tty) {
- strcpy( console, tty );
- if (!strncmp( tty, "/dev/cua", 8 ))
- serial_cons=1;
- }
- else
- /* falls back to /dev/tty1 if an error occurs */
- strcpy( console, default_console );
- }
- if (!first_terminal)
- first_terminal = console;
-#if defined (__sparc__)
- if (serial_cons > 0 && !strncmp(term_ptr,"TERM=linux",10))
- term_ptr = "TERM=vt100";
-#endif
- if (serial_cons) {
- /* disable other but the first terminal:
- * VT is not initialized anymore on 2.2 kernel when booting from
- * serial console, therefore modprobe is flooding the display with
- * "can't locate module char-major-4" messages. */
- log = 0;
- second_terminal = 0;
- }
+ 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;
}
extern int
init_main(int argc, char * * argv)
{
- const char * rc_arguments[100];
- const char * arguments[100];
- int run_rc = TRUE;
- int j;
- int pid1 = 0;
- int pid2 = 0;
- struct stat statbuf;
- const char * tty_commands[3] = { "etc/init.d/rcS", "bin/sh"};
- int serial_console = 0;
- int retval;
-
- /*
- * If I am started as /linuxrc instead of /sbin/init, I don't have the
- * environment that init expects. I can't fix the signal behavior. Try
- * to divorce from the controlling terminal with setsid(). This won't work
- * if I am the process group leader.
- */
- setsid();
-
+ 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]");
+
+
+#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(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
- message(log, "%s: started. ", argv[0]);
+ /* Close whatever files are open, and reset the console. */
+ close(0);
+ close(1);
+ close(2);
+ set_term();
+ setsid();
- for ( j = 1; j < argc; j++ ) {
- if ( strcmp(argv[j], "single") == 0 ) {
- run_rc = FALSE;
- tty_commands[0] = "bin/sh";
- tty_commands[1] = 0;
- }
- }
- for ( j = 0; __environ[j] != 0; j++ ) {
- if ( strncmp(__environ[j], "tty", 3) == 0
- && __environ[j][3] >= '1'
- && __environ[j][3] <= '2'
- && __environ[j][4] == '=' ) {
- const char * s = &__environ[j][5];
+ /* Make sure PATH is set to something sane */
+ if (getenv("PATH") == NULL)
+ putenv(PATH_DEFAULT);
- if ( *s == 0 || strcmp(s, "off") == 0 )
- s = 0;
+ /* 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);
- tty_commands[__environ[j][3] - '1'] = s;
- }
- /* Should catch the syntax of Sparc kernel console setting. */
- /* The kernel does not recognize a serial console when getting*/
- /* console=/dev/ttySX !! */
- else if ( strcmp(__environ[j], "console=ttya") == 0 ) {
- serial_console=1;
- }
- else if ( strcmp(__environ[j], "console=ttyb") == 0 ) {
- serial_console=2;
- }
- /* standard console settings */
- else if ( strncmp(__environ[j], "console=", 8) == 0 ) {
- first_terminal=&(__environ[j][8]);
- }
- else if ( strncmp(__environ[j], "TERM=", 5) == 0) {
- term_ptr=__environ[j];
- }
- }
- printf("mounting /proc ...\n");
+ /* Mount /proc */
+ message(console, "Mounting /proc: \n");
if (mount("/proc","/proc","proc",0,0)) {
- perror("mounting /proc failed\n");
- }
- printf("\tdone.\n");
-
- if (get_kernel_revision() >= 2*65536+1*256+71) {
- /* if >= 2.1.71 kernel, /dev/console is not a symlink anymore:
- * use it as primary console */
- serial_console=-1;
+ message(log, "%s: could not mount /proc!\n", argv[0]);
+ message(console, "failed!\n");
}
+ message(console, "done.\n");
- /* Make sure /etc/init.d/rc exists */
- retval= stat(tty_commands[0],&statbuf);
- if (retval)
- run_rc = FALSE;
-
- configure_terminals( serial_console, run_rc);
+ /* Make sure there is enough memory to do something useful*/
set_free_pages();
-
- /* not enough memory to do anything useful*/
if (mem_total() < 2000) {
+ int retval;
retval= stat("/etc/fstab",&statbuf);
if (retval) {
- printf("You do not have enough RAM, sorry.\n");
+ message(console, "%s", no_memory);
while (1) { sleep(1);}
} else {
/* Try to turn on swap */
- static const char * const swapon_args[] = {"/bin/swapon", "-a", 0};
- waitfor(run("/bin/swapon", swapon_args, console, 0));
+ waitfor(run("/bin/swapon -a", console, 0));
if (mem_total() < 2000) {
- printf("You do not have enough RAM, sorry.\n");
+ message(console, "%s", no_memory);
while (1) { sleep(1);}
}
}
}
- /*
- * Don't modify **argv directly, it would show up in the "ps" display.
- * I don't want "init" to look like "rc".
- */
- rc_arguments[0] = tty_commands[0];
- for ( j = 1; j < argc; j++ ) {
- rc_arguments[j] = argv[j];
+ /* 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]");
}
- rc_arguments[j] = 0;
- arguments[0] = "-sh";
- arguments[1] = 0;
-
- /* Ok, now launch the rc script /etc/init.d/rcS and prepare to start up
- * some VTs on tty1 and tty2 if somebody hits enter
+ /* 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 && tty_commands[0] ) {
- if ( run_rc == TRUE ) {
- pid1 = run(tty_commands[0], rc_arguments, first_terminal, 0);
- } else {
- pid2 = run(tty_commands[1], arguments, first_terminal, 1);
- }
+ if ( pid1 == 0 && *tty0_commands ) {
+ pid1 = run(tty0_commands, console, 1);
}
- if ( pid2 == 0 && second_terminal && tty_commands[1] ) {
- pid2 = run(tty_commands[1], arguments, second_terminal, 1);
+ if ( pid2 == 0 && *tty1_commands ) {
+ pid2 = run(tty1_commands, second_terminal, 1);
}
wpid = wait(&status);
if ( wpid > 0 && wpid != pid1) {
@@ -467,6 +480,7 @@ init_main(int argc, char * * argv)
if ( wpid == pid2 ) {
pid2 = 0;
}
+ sleep(1);
}
}
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