summaryrefslogtreecommitdiffhomepage
path: root/init
diff options
context:
space:
mode:
Diffstat (limited to 'init')
-rw-r--r--init/init.c483
1 files changed, 274 insertions, 209 deletions
diff --git a/init/init.c b/init/init.c
index b71c9f74e..be04ec34f 100644
--- a/init/init.c
+++ b/init/init.c
@@ -23,6 +23,7 @@
#include "internal.h"
#include <stdio.h>
+#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
@@ -55,22 +56,57 @@
#endif
-#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 INITTAB "/etc/inittab" /* inittab file location */
-#ifndef BB_INIT_SCRIPT
-#define BB_INIT_SCRIPT "/etc/init.d/rcS" /* Initscript. */
-#endif
-
-#if 1
+#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 REBOOT "/sbin/reboot" /* Default ctrl-alt-del command */
+#define INITTAB "/etc/inittab" /* inittab file location */
+#define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
#define LOG 0x1
#define CONSOLE 0x2
+
+/* Allowed init action types */
+typedef enum {
+ SYSINIT=1,
+ CTRLALTDEL,
+ RESPAWN,
+ ASKFIRST,
+ WAIT,
+ ONCE
+} initActionEnum;
+
+/* And now a list of the actions we support in the version of init */
+typedef struct initActionType{
+ const char* name;
+ initActionEnum action;
+} initActionType;
+
+static const struct initActionType actions[] = {
+ {"sysinit", SYSINIT},
+ {"ctrlaltdel", CTRLALTDEL},
+ {"respawn", RESPAWN},
+ {"askfirst", ASKFIRST},
+ {"wait", WAIT},
+ {"once", ONCE},
+ {0}
+};
+
+/* Set up a linked list of initactions, to be read from inittab */
+typedef struct initActionTag initAction;
+struct initActionTag {
+ pid_t pid;
+ char process[256];
+ char *console;
+ initAction *nextPtr;
+ initActionEnum action;
+};
+initAction* initActionList = NULL;
+
+
static char *console = _PATH_CONSOLE;
static char *second_console = VT_SECONDARY;
static char *log = VT_LOG;
@@ -100,8 +136,9 @@ int device_open(char *device, int mode)
* device may be bitwise-or'd from LOG | CONSOLE */
void message(int device, char *fmt, ...)
{
- int fd;
va_list arguments;
+ int fd;
+
#ifdef BB_SYSLOGD
/* Log the message to syslogd */
@@ -298,16 +335,18 @@ static int waitfor(int pid)
}
-static pid_t run(const char * const* command,
+static pid_t run(char* command,
char *terminal, int get_enter)
{
- int fd;
+ int i;
pid_t pid;
- const char * const* cmd = command+1;
+ char* tmpCmd;
+ char* cmd[255];
static const char press_enter[] =
"\nPlease press Enter to activate this console. ";
if ((pid = fork()) == 0) {
+ int fd;
/* Clean up */
close(0);
close(1);
@@ -321,7 +360,7 @@ static pid_t run(const char * const* command,
signal(SIGTERM, SIG_DFL);
if ((fd = device_open(terminal, O_RDWR)) < 0) {
- message(LOG, "Bummer, can't open %s\r\n", terminal);
+ message(LOG|CONSOLE, "Bummer, can't open %s\r\n", terminal);
exit(-1);
}
dup(fd);
@@ -340,21 +379,32 @@ static pid_t run(const char * const* command,
*/
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);
+ command, getpid(), terminal );
+ write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
+ read(fileno(stdin), &c, 1);
}
+ /* 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;
+
/* Log the process name and args */
- message(LOG|CONSOLE, "Starting pid %d, console %s: '", getpid(), terminal);
- while ( *cmd) message(LOG|CONSOLE, "%s ", *cmd++);
- message(LOG|CONSOLE, "'\r\n");
-
+ message(LOG, "Starting pid %d, console %s: '%s'\r\n",
+ getpid(), terminal, cmd[0]);
+
/* 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);
+ execvp(cmd[0], cmd);
- message(LOG, "Bummer, could not run '%s'\n", command);
+ /* We're still here? Some error happened. */
+ message(LOG|CONSOLE, "Bummer, could not run '%s': %s\n", cmd[0],
+ strerror(errno));
exit(-1);
}
return pid;
@@ -365,15 +415,13 @@ static pid_t run(const char * const* command,
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));
+ waitfor(run("/bin/swapon swapon -a", log, FALSE));
if (mem_total() < 3500)
goto goodnight;
} else
@@ -385,33 +433,28 @@ goodnight:
while (1) sleep(1);
}
+#ifndef DEBUG_INIT
static void shutdown_system(void)
{
- const char* const swap_off_cmd[] = { "swapoff", "swapoff", "-a", 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, "\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");
-#ifndef DEBUG_INIT
kill(-1, SIGHUP);
-#endif
sleep(2);
sync();
+
message(CONSOLE, "Sending SIGKILL to all processes.\r\n");
-#ifndef DEBUG_INIT
kill(-1, SIGKILL);
-#endif
sleep(1);
+
message(CONSOLE, "Disabling swap.\r\n");
- waitfor(run( swap_off_cmd, console, FALSE));
+ waitfor(run( "swapoff -a", console, FALSE));
message(CONSOLE, "Unmounting filesystems.\r\n");
- waitfor(run( umount_cmd, console, FALSE));
+ waitfor(run( "umount -a", console, FALSE));
sync();
if (kernel_version > 0 && kernel_version <= 2 * 65536 + 2 * 256 + 11) {
/* bdflush, kupdate not needed for kernels >2.2.11 */
@@ -427,14 +470,12 @@ static void halt_signal(int sig)
message(CONSOLE,
"The system is halted. Press CTRL-ALT-DEL or turn off power\r\n");
sync();
-#ifndef DEBUG_INIT
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
if (sig == SIGUSR2)
reboot(RB_POWER_OFF);
else
#endif
- reboot(RB_HALT_SYSTEM);
-#endif
+ reboot(RB_HALT_SYSTEM);
exit(0);
}
@@ -443,64 +484,157 @@ static void reboot_signal(int sig)
shutdown_system();
message(CONSOLE, "Please stand by while rebooting the system.\r\n");
sync();
-#ifndef DEBUG_INIT
reboot(RB_AUTOBOOT);
-#endif
exit(0);
}
+static void ctrl_alt_del_signal(int sig)
+{
+ initAction* a;
+ /* Run whatever we are supposed to run */
+ for( a=initActionList ; a; a=a->nextPtr) {
+ if (a->action == CTRLALTDEL) {
+ waitfor(run(a->process, console, FALSE));
+ }
+ }
+}
+#endif
+
+void new_initAction (const struct initActionType *a,
+ char* process, char* console)
+{
+ initAction* newAction;
+ newAction = calloc ((size_t)(1), sizeof(initAction));
+ if (!newAction) {
+ fprintf(stderr, "Memory allocation failure\n");
+ while (1) sleep(1);
+ }
+ newAction->nextPtr = initActionList;
+ initActionList = newAction;
+ strncpy( newAction->process, process, 255);
+ newAction->action = a->action;
+ newAction->console = console;
+ newAction->pid = 0;
+}
+
+void delete_initAction (initAction *action)
+{
+ initAction *a, *b=NULL;
+ for( a=initActionList ; a; b=a, a=a->nextPtr) {
+ if (a == action && b != NULL) {
+ b->nextPtr=a->nextPtr;
+ free( a);
+ break;
+ }
+ }
+}
+
+void parse_inittab(void)
+{
+ FILE* file;
+ char buf[256];
+ char *p, *q, *r;
+ const struct initActionType *a = actions;
+ int foundIt;
+
+
+ file = fopen(INITTAB, "r");
+ if (file == NULL) {
+ /* No inittab file -- set up some default behavior */
+
+ /* Askfirst shell on tty1 */
+ new_initAction( &(actions[3]), SHELL, console );
+ /* Askfirst shell on tty2 */
+ if (second_console != NULL)
+ new_initAction( &(actions[3]), SHELL, second_console );
+ /* Control-alt-del */
+ new_initAction( &(actions[1]), REBOOT, console );
+ /* sysinit */
+ new_initAction( &(actions[0]), INIT_SCRIPT, console );
+
+ return;
+ }
+
+ while ( fgets(buf, 255, file) != NULL) {
+ foundIt=FALSE;
+ for(p = buf; *p == ' ' || *p == '\t'; p++);
+ if (*p == '#' || *p == '\n') continue;
+
+ /* Trim the trailing \n */
+ q = strrchr( p, '\n');
+ if (q != NULL)
+ *q='\0';
+
+ /* Skip past the ID field and the runlevel
+ * field (both are ignored) */
+ p = strchr( p, ':');
+
+ /* Now peal off the process field from the end
+ * of the string */
+ q = strrchr( p, ':');
+ if ( q == NULL || *(q+1) == '\0' ) {
+ fprintf(stderr, "Bad inittab entry: %s\n", buf);
+ continue;
+ } else {
+ *q='\0';
+ ++q;
+ }
+
+ /* Now peal off the action field */
+ r = strrchr( p, ':');
+ if ( r == NULL || *(r+1) == '\0') {
+ fprintf(stderr, "Bad inittab entry: %s\n", buf);
+ continue;
+ } else {
+ ++r;
+ }
+
+ /* Ok, now process it */
+ a = actions;
+ while (a->name != 0) {
+ if (strcmp(a->name, r) == 0) {
+ new_initAction( a, q, NULL);
+ foundIt=TRUE;
+ }
+ a++;
+ }
+ if (foundIt==TRUE)
+ continue;
+ else {
+ /* Choke on an unknown action */
+ fprintf(stderr, "Bad inittab entry: %s\n", buf);
+ }
+ }
+ return;
+}
+
+
extern int init_main(int argc, char **argv)
{
- int run_rc = FALSE;
+ initAction *a;
+ pid_t wpid;
+ int status;
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;
- 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";
-#else
- char *hello_msg_format =
- "init started: BusyBox v%s (%s) multi-call binary\r\n";
-#endif
-
#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() */
+ /* 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(SIGINT, ctrl_alt_del_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
reboot(RB_DISABLE_CAD);
#endif
-
+
/* Figure out where the default console should be */
console_init();
@@ -517,9 +651,13 @@ extern int init_main(int argc, char **argv)
/* Hello world */
#ifndef DEBUG_INIT
- message(CONSOLE|LOG, hello_msg_format, BB_VER, BB_BT);
+ message(CONSOLE|LOG,
+ "init started: BusyBox v%s (%s) multi-call binary\r\n",
+ BB_VER, BB_BT);
#else
- message(CONSOLE|LOG, hello_msg_format, getpid(), BB_VER, BB_BT);
+ message(CONSOLE|LOG,
+ "init(%d) started: BusyBox v%s (%s) multi-call binary\r\n",
+ getpid(), BB_VER, BB_BT);
#endif
@@ -537,150 +675,77 @@ extern int init_main(int argc, char **argv)
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;
+ /* Ask first then start a shell on tty2 */
+ if (second_console != NULL)
+ new_initAction( &(actions[3]), SHELL, second_console);
+ /* Ask first then start a shell on tty1 */
+ new_initAction( &(actions[3]), SHELL, console);
+ } else {
+ /* Not in single user mode -- see what inittab says */
+ parse_inittab();
}
- /* Make sure an init script exists before trying to run it */
- if (single==FALSE && stat(BB_INIT_SCRIPT, &statbuf)==0) {
- run_rc = TRUE;
- wait_for_enter_tty1 = FALSE;
- tty1_command = rc_script_command;
+ /* Now run everything that needs to be run */
+
+ /* First run sysinit */
+ for( a=initActionList ; a; a=a->nextPtr) {
+ if (a->action == SYSINIT) {
+ waitfor(run(a->process, console, FALSE));
+ /* Now remove the "sysinit" entry from the list */
+ delete_initAction( a);
+ }
}
-
- /* 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));
+ /* Next run anything that wants to block */
+ for( a=initActionList ; a; a=a->nextPtr) {
+ if (a->action == WAIT) {
+ waitfor(run(a->process, console, FALSE));
+ /* Now remove the "wait" entry from the list */
+ delete_initAction( a);
}
- 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;
+ }
+ /* Next run anything to be run only once */
+ for( a=initActionList ; a; a=a->nextPtr) {
+ if (a->action == ONCE) {
+ run(a->process, console, FALSE);
+ /* Now remove the "once" entry from the list */
+ delete_initAction( a);
}
}
-
- /* Ok, now launch the tty1_command and tty2_command */
+ /* Now run the looping stuff */
for (;;) {
- pid_t wpid;
- int status;
-
- if (pid1 == 0 && tty1_command) {
- pid1 = run(tty1_command, console, wait_for_enter_tty1);
- }
-#ifdef BB_FEATURE_INIT_SECOND_CONSOLE
- if (pid2 == 0 && tty2_command && second_console) {
- pid2 = run(tty2_command, second_console, wait_for_enter_tty2);
+ for( a=initActionList ; a; a=a->nextPtr) {
+ /* Only run stuff with pid==0. If they have
+ * a pid, that means they are still running */
+ if (a->pid == 0) {
+ switch(a->action) {
+ case RESPAWN:
+ /* run the respawn stuff */
+ a->pid = run(a->process, console, FALSE);
+ break;
+ case ASKFIRST:
+ /* run the askfirst stuff */
+ a->pid = waitfor(run(a->process, console, TRUE));
+ break;
+ /* silence the compiler's whining */
+ default:
+ break;
+ }
+ }
}
-#endif
+
wpid = wait(&status);
+ /* Find out who died and clean up their corpse */
if (wpid > 0 ) {
message(LOG, "pid %d exited, status=%x.\n", wpid, status);
- }
- /* Don't respawn init script if it exits */
- if (wpid == pid1) {
- if (run_rc == FALSE) {
- pid1 = 0;
+ for( a=initActionList ; a; a=a->nextPtr) {
+ if (a->pid==wpid) {
+ a->pid=0;
+ }
}
-#ifdef BB_INIT_CMD_IF_RC_SCRIPT_EXITS
- else {
- pid1 = 0;
- run_rc=FALSE;
- 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);
- }
-}
-
-#else
-
-
-void parse_inittab(void)
-{
- FILE* file;
- char buf[256];
- char action[256]="";
- char process[256]="";
- char *p, *q;
-
-
- if ((file = fopen(INITTAB, "r")) < 0) {
- /* No inittab file -- set up some default behavior */
-
- /* FIXME */
- return;
- }
-
- while ( fgets(buf, 255, file) != NULL) {
- for(p = buf; *p == ' ' || *p == '\t'; p++);
- if (*p == '#' || *p == '\n') continue;
-
- /* Trim the trailing \n */
- q = strrchr( p, '\n');
- if (q != NULL)
- *q='\0';
-
- /* Skip past the ID field and the runlevel
- * field (both are ignored) */
- p = strchr( p, ':');
-
- /* Now peal off the process field from the end
- * of the string */
- q = strrchr( p, ':');
- if ( q == NULL || q+1 == NULL)
- goto choke;
- *q='\0';
- strcpy( process, ++q);
- fprintf(stderr, "process=%s\n", process);
-
-
- /* Now peal off the action field */
- q = strrchr( p, ':');
- if ( q == NULL || q+1 == NULL)
- goto choke;
- strcpy( action, ++q);
- fprintf(stderr, "action=%s\n", action);
-
-
- /* Ok, now do the right thing */
+ sleep(1);
}
- return;
-
-choke:
- //message(CONSOLE, "Bad entry:");
- fprintf(stderr, "Bad inittab entry: %s", buf);
- while (1) sleep(1);
-
-}
-
-
-extern int init_main(int argc, char **argv)
-{
- parse_inittab();
- exit( TRUE);
}
-
-#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-24 03:39:22 +0000