1 files changed, 274 insertions, 209 deletions
diff --git a/init.c b/init.c
index b71c9f74e..be04ec34f 100644
--- a/init.c
+++ b/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_PRIMARY      "/dev/tty1"       /* Primary virtual console */
-#define VT_SECONDARY    "/dev/tty2"     /* Virtual console */
+#define VT_SECONDARY    "/dev/tty2"       /* Virtual console */
-#define VT_LOG          "/dev/tty3"     /* Virtual console */
+#define VT_LOG          "/dev/tty3"       /* Virtual console */
-#define SERIAL_CON0     "/dev/ttyS0"    /* Primary serial console */
+#define SERIAL_CON0     "/dev/ttyS0"      /* Primary serial console */
-#define SERIAL_CON1     "/dev/ttyS1"    /* Serial console */
+#define SERIAL_CON1     "/dev/ttyS1"      /* Serial console */
-#define GETTY           "/sbin/getty"   /* Default location of getty */
+#define SHELL           "/bin/sh"         /* Default shell */
-#define SHELL           "/bin/sh"       /* Default shell */
+#define REBOOT          "/sbin/reboot"    /* Default ctrl-alt-del command */
-#define INITTAB          "/etc/inittab" /* inittab file location */
+#define INITTAB         "/etc/inittab"    /* inittab file location */
-#ifndef BB_INIT_SCRIPT
+#define INIT_SCRIPT     "/etc/init.d/rcS" /* Default sysinit script. */
-#define BB_INIT_SCRIPT  "/etc/init.d/rcS"       /* Initscript. */
-#endif
-#if 1
 #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 );
+                    command, getpid(), terminal );
-            write(1, press_enter, sizeof(press_enter) - 1);
+            write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
-            read(0, &c, 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);
+        message(LOG, "Starting pid %d, console %s: '%s'\r\n", 
-        while ( *cmd) message(LOG|CONSOLE, "%s ", *cmd++);
+                getpid(), terminal, cmd[0]);
-        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. */
-        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);
+    reboot(RB_HALT_SYSTEM);
-#endif
    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
+    /* Set up sig handlers  -- be sure to clear all of these in run() */
-     * 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;
+        /* Ask first then start a shell on tty2 */
-        tty2_command = shell_command;
+        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 */
+    /* Now run everything that needs to be run */
-    if (single==FALSE && stat(BB_INIT_SCRIPT, &statbuf)==0) {
-        run_rc = TRUE;
+    /* First run sysinit */
-        wait_for_enter_tty1 = FALSE;
+    for( a=initActionList ; a; a=a->nextPtr) {
-        tty1_command = rc_script_command;
+        if (a->action == SYSINIT) {
+            waitfor(run(a->process, console, FALSE));
+            /* Now remove the "sysinit" entry from the list */
+            delete_initAction( a);
+        }
    }
-    
+    /* Next run anything that wants to block */
-    /* Make sure /sbin/getty exists before trying to run it */
+    for( a=initActionList ; a; a=a->nextPtr) {
-    if (stat(GETTY, &statbuf)==0) {
+        if (a->action == WAIT) {
-        char* where;
+            waitfor(run(a->process, console, FALSE));
-        /* First do tty2 */
+            /* Now remove the "wait" entry from the list */
-        wait_for_enter_tty2 = FALSE;
+            delete_initAction( a);
-        where = strrchr( second_console, '/');
-        if ( where != NULL) {
-            where++;
-            strncpy( which_vt2, where, sizeof(which_vt2));
        }
-        tty2_command = getty2_command;
+    }
+    /* Next run anything to be run only once */
-        /* Check on hooking a getty onto tty1 */
+    for( a=initActionList ; a; a=a->nextPtr) {
-        if (run_rc == FALSE && single==FALSE) {
+        if (a->action == ONCE) {
-            wait_for_enter_tty1 = FALSE;
+            run(a->process, console, FALSE);
-            where = strrchr( console, '/');
+            /* Now remove the "once" entry from the list */
-            if ( where != NULL) {
+            delete_initAction( a);
-                where++;
-                strncpy( which_vt1, where, sizeof(which_vt1));
-            }
-            tty1_command = getty1_command;
        }
    }
-    
-    /* Ok, now launch the tty1_command and tty2_command */
+    /* Now run the looping stuff */
    for (;;) {
-        pid_t wpid;
+        for( a=initActionList ; a; a=a->nextPtr) {
-        int status;
+            /* Only run stuff with pid==0.  If they have
+             * a pid, that means they are still running */
-        if (pid1 == 0 && tty1_command) {
+            if (a->pid == 0) {
-            pid1 = run(tty1_command, console, wait_for_enter_tty1);
+                switch(a->action) {
-        }
+                    case RESPAWN:
-#ifdef BB_FEATURE_INIT_SECOND_CONSOLE
+                        /* run the respawn stuff */
-        if (pid2 == 0 && tty2_command && second_console) {
+                        a->pid = run(a->process, console, FALSE);
-            pid2 = run(tty2_command, second_console, wait_for_enter_tty2);
+                        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);
-        }
+            for( a=initActionList ; a; a=a->nextPtr) {
-        /* Don't respawn init script if it exits */
+                if (a->pid==wpid) {
-        if (wpid == pid1) {
+                    a->pid=0;
-            if (run_rc == FALSE) {
+                }
-                pid1 = 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