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-rw-r--r--init.c126
1 files changed, 84 insertions, 42 deletions
diff --git a/init.c b/init.c
index 899dca4..2f2203b 100644
--- a/init.c
+++ b/init.c
@@ -22,6 +22,11 @@
*
*/
+/* Turn this on to disable all the dangerous
+ rebooting stuff when debugging.
+#define DEBUG_INIT
+*/
+
#include "internal.h"
#include <stdio.h>
#include <string.h>
@@ -78,7 +83,8 @@ typedef enum {
RESPAWN,
ASKFIRST,
WAIT,
- ONCE
+ ONCE,
+ CTRLALTDEL
} initActionEnum;
/* And now a list of the actions we support in the version of init */
@@ -93,6 +99,7 @@ static const struct initActionType actions[] = {
{"askfirst", ASKFIRST},
{"wait", WAIT},
{"once", ONCE},
+ {"ctrlaltdel", CTRLALTDEL},
{0}
};
@@ -113,6 +120,7 @@ static char *log = VT_LOG;
static int kernelVersion = 0;
static char termType[32] = "TERM=ansi";
static char console[32] = _PATH_CONSOLE;
+static void delete_initAction(initAction * action);
/* print a message to the specified device:
@@ -131,8 +139,8 @@ void message(int device, char *fmt, ...)
va_start(arguments, fmt);
vsnprintf(msg, sizeof(msg), fmt, arguments);
va_end(arguments);
- openlog("init", 0, LOG_DAEMON);
- syslog(LOG_DAEMON | LOG_NOTICE, msg);
+ openlog("init", 0, LOG_USER);
+ syslog(LOG_USER|LOG_INFO, msg);
closelog();
}
#else
@@ -146,11 +154,12 @@ void message(int device, char *fmt, ...)
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;
+ } else if ((log_fd = device_open(log, O_RDWR|O_NDELAY)) < 0) {
+ log_fd = -2;
fprintf(stderr, "Bummer, can't write to log on %s!\r\n", log);
fflush(stderr);
- return;
+ log = NULL;
+ device = CONSOLE;
}
}
if ((device & LOG) && (log_fd >= 0)) {
@@ -303,10 +312,10 @@ static void console_init()
/* 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 virtual terminals.\r\n");
log = NULL;
secondConsole = NULL;
+ message(LOG | CONSOLE,
+ "serial console detected. Disabling virtual terminals.\r\n");
}
close(fd);
}
@@ -319,6 +328,7 @@ static pid_t run(char *command, char *terminal, int get_enter)
pid_t pid;
char *tmpCmd;
char *cmd[255];
+ char buf[255];
static const char press_enter[] =
"\nPlease press Enter to activate this console. ";
@@ -333,7 +343,9 @@ static pid_t run(char *command, char *terminal, int get_enter)
if ((pid = fork()) == 0) {
+#ifdef DEBUG_INIT
pid_t shell_pgid = getpid();
+#endif
/* Clean up */
close(0);
@@ -369,30 +381,40 @@ static pid_t run(char *command, char *terminal, int get_enter)
*/
char c;
+#ifdef DEBUG_INIT
message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\r\n",
command, shell_pgid, terminal);
+#endif
write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
read(fileno(stdin), &c, 1);
}
+#ifdef DEBUG_INIT
/* Log the process name and args */
- message(LOG, "Starting pid %d, console %s: '",
+ message(LOG, "Starting pid %d, console %s: '%s'\r\n",
shell_pgid, terminal, command);
-
- /* Convert command (char*) into cmd (char**, one word per string) */
- for (tmpCmd = command, i = 0;
- (tmpCmd = strsep(&command, " \t")) != NULL;) {
- if (*tmpCmd != '\0') {
- cmd[i] = tmpCmd;
-#ifdef DEBUG_INIT
- message(LOG, "%s ", tmpCmd);
#endif
- tmpCmd++;
- i++;
+
+ /* See if any special /bin/sh requiring characters are present */
+ if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
+ cmd[0] = SHELL;
+ cmd[1] = "-c";
+ strcpy(buf, "exec ");
+ strncat(buf, command, sizeof(buf) - strlen(buf) - 1);
+ cmd[2] = buf;
+ cmd[3] = NULL;
+ } else {
+ /* Convert command (char*) into cmd (char**, one word per string) */
+ for (tmpCmd = command, i = 0;
+ (tmpCmd = strsep(&command, " \t")) != NULL;) {
+ if (*tmpCmd != '\0') {
+ cmd[i] = tmpCmd;
+ tmpCmd++;
+ i++;
+ }
}
+ cmd[i] = NULL;
}
- cmd[i] = NULL;
- message(LOG, "'\r\n");
/* Now run it. The new program will take over this PID,
* so nothing further in init.c should be run. */
@@ -413,9 +435,8 @@ static int waitfor(char *command, char *terminal, int get_enter)
while (1) {
wpid = wait(&status);
- if (wpid > 0) {
- message(LOG, "Process '%s' (pid %d) exited.\n", command, wpid);
- break;
+ if (wpid > 0 && wpid != pid) {
+ continue;
}
if (wpid == pid)
break;
@@ -424,7 +445,7 @@ static int waitfor(char *command, char *terminal, int get_enter)
}
/* Make sure there is enough memory to do something useful. *
- * Calls swapon if needed so be sure /proc is mounted. */
+ * Calls "swapon -a" if needed so be sure /etc/fstab is present... */
static void check_memory()
{
struct stat statBuf;
@@ -434,7 +455,7 @@ static void check_memory()
if (stat("/etc/fstab", &statBuf) == 0) {
/* Try to turn on swap */
- waitfor("/bin/swapon swapon -a", log, FALSE);
+ system("/sbin/swapon swapon -a");
if (mem_total() < 3500)
goto goodnight;
} else
@@ -448,31 +469,45 @@ static void check_memory()
sleep(1);
}
+/* Run all commands to be run right before halt/reboot */
+static void run_lastAction(void)
+{
+ initAction *a;
+ for (a = initActionList; a; a = a->nextPtr) {
+ if (a->action == CTRLALTDEL) {
+ waitfor(a->process, a->console, FALSE);
+ delete_initAction(a);
+ }
+ }
+}
+
+
#ifndef DEBUG_INIT
static void shutdown_system(void)
{
+
/* first disable our SIGHUP signal */
signal(SIGHUP, SIG_DFL);
/* Allow Ctrl-Alt-Del to reboot system. */
reboot(RB_ENABLE_CAD);
- message(CONSOLE, "\r\nThe system is going down NOW !!\r\n");
+
+ message(CONSOLE|LOG, "\r\nThe system is going down NOW !!\r\n");
sync();
/* Send signals to every process _except_ pid 1 */
- message(CONSOLE, "Sending SIGTERM to all processes.\r\n");
+ message(CONSOLE|LOG, "Sending SIGTERM to all processes.\r\n");
kill(-1, SIGTERM);
- sleep(5);
+ sleep(1);
sync();
- message(CONSOLE, "Sending SIGKILL to all processes.\r\n");
+ message(CONSOLE|LOG, "Sending SIGKILL to all processes.\r\n");
kill(-1, SIGKILL);
- sleep(5);
+ sleep(1);
+
+ /* run everything to be run at "ctrlaltdel" */
+ run_lastAction();
- message(CONSOLE, "Disabling swap.\r\n");
- waitfor("swapoff -a", console, FALSE);
- message(CONSOLE, "Unmounting filesystems.\r\n");
- waitfor("umount -a -r", console, FALSE);
sync();
if (kernelVersion > 0 && kernelVersion <= 2 * 65536 + 2 * 256 + 11) {
/* bdflush, kupdate not needed for kernels >2.2.11 */
@@ -484,14 +519,14 @@ static void shutdown_system(void)
static void halt_signal(int sig)
{
shutdown_system();
- message(CONSOLE,
+ message(CONSOLE|LOG,
"The system is halted. Press %s or turn off power\r\n",
(secondConsole == NULL) /* serial console */
? "Reset" : "CTRL-ALT-DEL");
sync();
/* allow time for last message to reach serial console */
- sleep(5);
+ sleep(2);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
if (sig == SIGUSR2)
@@ -505,7 +540,7 @@ static void halt_signal(int sig)
static void reboot_signal(int sig)
{
shutdown_system();
- message(CONSOLE, "Please stand by while rebooting the system.\r\n");
+ message(CONSOLE|LOG, "Please stand by while rebooting the system.\r\n");
sync();
/* allow time for last message to reach serial console */
@@ -631,7 +666,7 @@ void new_initAction(initActionEnum action, char *process, char *cons)
// newAction->process, newAction->action, newAction->console);
}
-void delete_initAction(initAction * action)
+static void delete_initAction(initAction * action)
{
initAction *a, *b = NULL;
@@ -669,6 +704,10 @@ void parse_inittab(void)
if (file == NULL) {
/* No inittab file -- set up some default behavior */
#endif
+ /* Swapoff on halt/reboot */
+ new_initAction(CTRLALTDEL, "/bin/umount -a -r > /dev/null 2>&1", console);
+ /* Umount all filesystems on halt/reboot */
+ new_initAction(CTRLALTDEL, "/bin/umount -a -r > /dev/null 2>&1", console);
/* Askfirst shell on tty1 */
new_initAction(ASKFIRST, SHELL, console);
/* Askfirst shell on tty2 */
@@ -756,6 +795,8 @@ void parse_inittab(void)
#endif
}
+
+
extern int init_main(int argc, char **argv)
{
initAction *a;
@@ -768,9 +809,6 @@ extern int init_main(int argc, char **argv)
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");
}
- /* Fix up argv[0] to be certain we claim to be init */
- strncpy(argv[0], "init", strlen(argv[0]));
-
/* Set up sig handlers -- be sure to
* clear all of these in run() */
signal(SIGUSR1, halt_signal);
@@ -838,6 +876,10 @@ extern int init_main(int argc, char **argv)
* of "askfirst" shells */
parse_inittab();
}
+
+ /* Fix up argv[0] to be certain we claim to be init */
+ strncpy(argv[0], "init", strlen(argv[0])+1);
+ strncpy(argv[1], "\0", strlen(argv[1])+1);
/* Now run everything that needs to be run */
generated by cgit v1.1 at 2024-12-29 20:07:48 +0000