Stuf

1 files changed, 321 insertions, 307 deletions

diff --git a/init/init.c b/init/init.c
index c32124dd0..0676bf76d 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);
         }
 }