Add in some (theoretical) uClinux support. Some init cleanups

git-svn-id: svn://busybox.net/trunk/busybox@3596 69ca8d6d-28ef-0310-b511-8ec308f3f277

1 files changed, 51 insertions, 46 deletions

diff --git a/init/init.c b/init/init.c
index b6eaa46ea..1a5056c8c 100644
--- a/init/init.c
+++ b/init/init.c
@@ -75,6 +75,12 @@ struct serial_struct {
 };
 
 
+#if (__GNU_LIBRARY__ > 5) || defined(__dietlibc__) 
+  #include <sys/reboot.h>
+  #define init_reboot(magic) reboot(magic)
+#else
+  #define init_reboot(magic) reboot(0xfee1dead, 672274793, magic)
+#endif
 
 #ifndef RB_HALT_SYSTEM
 static const int RB_HALT_SYSTEM = 0xcdef0123;
@@ -84,13 +90,6 @@ static const int RB_DISABLE_CAD = 0;
 static const int RB_AUTOBOOT = 0x01234567;
 #endif
 
-#if (__GNU_LIBRARY__ > 5) || defined(__dietlibc__) 
-  #include <sys/reboot.h>
-  #define init_reboot(magic) reboot(magic)
-#else
-  #define init_reboot(magic) reboot(0xfee1dead, 672274793, magic)
-#endif
-
 #ifndef _PATH_STDPATH
 #define _PATH_STDPATH   "/usr/bin:/bin:/usr/sbin:/sbin"
 #endif
@@ -218,7 +217,7 @@ static void message(int device, char *fmt, ...)
                         device = CONSOLE;
                 } 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);
+                        fprintf(stderr, "Bummer, can't write to log on %s!\n", log);
                         log = NULL;
                         device = CONSOLE;
                 }
@@ -382,7 +381,7 @@ static void console_init(void)
                         if (strcmp( termType, "TERM=linux" ) == 0)
                                 safe_strncpy(termType, "TERM=vt102", sizeof(termType));
                         message(LOG | CONSOLE,
-                                        "serial console detected.  Disabling virtual terminals.\r\n");
+                                        "serial console detected.  Disabling virtual terminals.\n");
                 }
                 close(fd);
         }
@@ -395,7 +394,7 @@ static void fixup_argv(int argc, char **argv, char *new_argv0)
         /* Fix up argv[0] to be certain we claim to be init */
         len = strlen(argv[0]);
         memset(argv[0], 0, len);
-        strncpy(argv[0], new_argv0, len);
+        safe_strncpy(argv[0], new_argv0, len + 1);
 
         /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
         len = 1;
@@ -425,7 +424,7 @@ static pid_t run(char *command, char *terminal, int get_enter)
         char *environment[MAXENV+1] = {
                 termType,
                 "HOME=/",
-                "PATH=/usr/bin:/bin:/usr/sbin:/sbin",
+                "PATH=" _PATH_STDPATH,
                 "SHELL=" SHELL,
                 "USER=root",
                 NULL
@@ -444,7 +443,12 @@ static pid_t run(char *command, char *terminal, int get_enter)
                 }
         }
 
-        if ((pid = fork()) == 0) {
+#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
+        if ((pid = fork()) == 0) 
+#else
+        if ((pid = vfork()) == 0) 
+#endif
+        {
                 /* Clean up */
                 ioctl(0, TIOCNOTTY, 0);
                 close(0);
@@ -465,7 +469,7 @@ static pid_t run(char *command, char *terminal, int get_enter)
                                                 terminal);
                                 exit(1);
                         }
-                        message(LOG | CONSOLE, "Bummer, can't open %s\r\n", terminal);
+                        message(LOG | CONSOLE, "Bummer, can't open %s\n", terminal);
                         exit(1);
                 }
                 dup2(fd, 0);
@@ -480,13 +484,16 @@ static pid_t run(char *command, char *terminal, int get_enter)
                         cmd[0] = SHELL;
                         cmd[1] = "-c";
                         strcpy(buf, "exec ");
-                        strncat(buf, command, sizeof(buf) - strlen(buf) - 1);
+                        safe_strncpy(buf + sizeof("exec "), command, 
+                                        sizeof(buf) - sizeof("exec "));
                         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;) {
+                        safe_strncpy(buf, command, sizeof(buf));
+                        s = buf;
+                        for (tmpCmd = buf, i = 0;
+                                        (tmpCmd = strsep(&s, " \t")) != NULL;) {
                                 if (*tmpCmd != '\0') {
                                         cmd[i] = tmpCmd;
                                         tmpCmd++;
@@ -533,7 +540,7 @@ static pid_t run(char *command, char *terminal, int get_enter)
                          * specifies.
                          */
 #ifdef DEBUG_INIT
-                        message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\r\n",
+                        message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\n",
                                         cmd[0], getpid(), terminal);
 #endif
                         write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
@@ -542,7 +549,7 @@ static pid_t run(char *command, char *terminal, int get_enter)
 
 #ifdef DEBUG_INIT
                 /* Log the process name and args */
-                message(LOG, "Starting pid %d, console %s: '%s'\r\n",
+                message(LOG, "Starting pid %d, console %s: '%s'\n",
                                 getpid(), terminal, command);
 #endif
 
@@ -592,6 +599,7 @@ static void check_memory(void)
         if (check_free_memory() > 1000)
                 return;
 
+#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
         if (stat("/etc/fstab", &statBuf) == 0) {
                 /* swapon -a requires /proc typically */
                 waitfor("mount proc /proc -t proc", console, FALSE);
@@ -602,10 +610,11 @@ static void check_memory(void)
         } else
                 goto goodnight;
         return;
+#endif
 
   goodnight:
         message(CONSOLE,
-                        "Sorry, your computer does not have enough memory.\r\n");
+                        "Sorry, your computer does not have enough memory.\n");
         loop_forever();
 }
 
@@ -627,22 +636,29 @@ static void run_actions(initActionEnum action)
 static void shutdown_system(void)
 {
 
-        /* first disable our SIGHUP signal */
-        signal(SIGHUP, SIG_DFL);
+        /* first disable all our signals */
+        sigemptyset(&block_signals);
+        sigaddset(&block_signals, SIGHUP);
+        sigaddset(&block_signals, SIGCHLD);
+        sigaddset(&block_signals, SIGUSR1);
+        sigaddset(&block_signals, SIGUSR2);
+        sigaddset(&block_signals, SIGINT);
+        sigaddset(&block_signals, SIGTERM);
+        sigprocmask(SIG_BLOCK, &block_signals, NULL);
 
         /* Allow Ctrl-Alt-Del to reboot system. */
         init_reboot(RB_ENABLE_CAD);
 
-        message(CONSOLE|LOG, "\r\nThe system is going down NOW !!\r\n");
+        message(CONSOLE|LOG, "\nThe system is going down NOW !!\n");
         sync();
 
         /* Send signals to every process _except_ pid 1 */
-        message(CONSOLE|LOG, "Sending SIGTERM to all processes.\r\n");
+        message(CONSOLE|LOG, "Sending SIGTERM to all processes.\n");
         kill(-1, SIGTERM);
         sleep(1);
         sync();
 
-        message(CONSOLE|LOG, "Sending SIGKILL to all processes.\r\n");
+        message(CONSOLE|LOG, "Sending SIGKILL to all processes.\n");
         kill(-1, SIGKILL);
         sleep(1);
 
@@ -661,7 +677,7 @@ static void halt_signal(int sig)
 {
         shutdown_system();
         message(CONSOLE|LOG,
-                        "The system is halted. Press %s or turn off power\r\n",
+                        "The system is halted. Press %s or turn off power\n",
                         (secondConsole == NULL) /* serial console */
                         ? "Reset" : "CTRL-ALT-DEL");
         sync();
@@ -680,7 +696,7 @@ static void halt_signal(int sig)
 static void reboot_signal(int sig)
 {
         shutdown_system();
-        message(CONSOLE|LOG, "Please stand by while rebooting the system.\r\n");
+        message(CONSOLE|LOG, "Please stand by while rebooting the system.\n");
         sync();
 
         /* allow time for last message to reach serial console */
@@ -701,9 +717,7 @@ static void ctrlaltdel_signal(int sig)
 static void new_initAction(initActionEnum action, char *process, char *cons)
 {
         initAction *newAction;
-#ifdef CONFIG_FEATURE_INIT_NORMAL_ORDER
         initAction *a;
-#endif
 
         if (*cons == '\0')
                 cons = console;
@@ -723,20 +737,15 @@ static void new_initAction(initActionEnum action, char *process, char *cons)
                 message(LOG | CONSOLE, "Memory allocation failure\n");
                 loop_forever();
         }
-#ifdef CONFIG_FEATURE_INIT_NORMAL_ORDER
         for (a = initActionList; a && a->nextPtr; a = a->nextPtr) ;
         if (a) {
                 a->nextPtr = newAction;
         } else {
                 initActionList = newAction;
         }
-#else
-        newAction->nextPtr = initActionList;
-        initActionList = newAction;
-#endif
-        strncpy(newAction->process, process, 255);
+        safe_strncpy(newAction->process, process, 255);
         newAction->action = action;
-        strncpy(newAction->console, cons, 255);
+        safe_strncpy(newAction->console, cons, 255);
         newAction->pid = 0;
 //    message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n",
 //      newAction->process, newAction->action, newAction->console);
@@ -782,16 +791,11 @@ static void parse_inittab(void)
 #endif
                 /* Reboot on Ctrl-Alt-Del */
                 new_initAction(CTRLALTDEL, "/sbin/reboot", console);
-#ifdef CONFIG_FEATURE_INIT_NORMAL_ORDER
                 /* Umount all filesystems on halt/reboot */
                 new_initAction(SHUTDOWN, "/bin/umount -a -r", console);
+#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
                 /* Swapoff on halt/reboot */
                 new_initAction(SHUTDOWN, "/sbin/swapoff -a", console);
-#else
-                /* Swapoff on halt/reboot */
-                new_initAction(SHUTDOWN, "/sbin/swapoff -a", console);
-                /* Umount all filesystems on halt/reboot */
-                new_initAction(SHUTDOWN, "/bin/umount -a -r", console);
 #endif
                 /* Askfirst shell on tty1 */
                 new_initAction(ASKFIRST, LOGIN_SHELL, console);
@@ -916,13 +920,14 @@ extern int init_main(int argc, char **argv)
         /* Figure out what kernel this is running */
         kernelVersion = get_kernel_revision();
 
-        /* Figure out where the default console should be */
-        console_init();
-
         /* Close whatever files are open, and reset the console. */
         close(0);
         close(1);
         close(2);
+
+        /* Figure out where the default console should be */
+        console_init();
+
         set_term(0);
         chdir("/");
         setsid();
@@ -937,14 +942,14 @@ extern int init_main(int argc, char **argv)
                         CONSOLE|
 #endif
                         LOG,
-                        "init started:  %s\r\n", full_version);
+                        "init started:  %s\n", full_version);
 #else
         message(
 #if ! defined CONFIG_FEATURE_EXTRA_QUIET
                         CONSOLE|
 #endif
                         LOG,
-                        "init(%d) started:  %s\r\n", getpid(), full_version);
+                        "init(%d) started:  %s\n", getpid(), full_version);
 #endif