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Diffstat (limited to 'init')
-rw-r--r--init/init.c406
1 files changed, 194 insertions, 212 deletions
diff --git a/init/init.c b/init/init.c
index 0676bf7..2834a4a 100644
--- a/init/init.c
+++ b/init/init.c
@@ -37,40 +37,39 @@
#include <sys/reboot.h>
#include <sys/kdaemon.h>
#include <sys/sysmacros.h>
-#include <linux/serial.h> /* for serial_struct */
-#include <sys/vt.h> /* for vt_stat */
+#include <linux/serial.h> /* for serial_struct */
+#include <sys/vt.h> /* for vt_stat */
#include <sys/ioctl.h>
#define DEBUG_INIT
-#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 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"
-static int maxproclen=0;
-static char* argv0;
-
-static char* console = CONSOLE;
-static char* second_terminal = "/dev/tty2";
-static char* log = "/dev/tty3";
+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 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;
+ 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);
@@ -78,16 +77,18 @@ int device_open(char* device, int mode)
}
/* print a message to the specified device */
-void message(char* device, char *fmt, ...)
+void message(char *device, char *fmt, ...)
{
int fd;
va_list arguments;
- if ((fd = device_open(device, O_WRONLY|O_NOCTTY|O_NDELAY)) >= 0) {
+
+ 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);
+ close(fd);
+ } else
+ vprintf(fmt, arguments);
}
/* Set terminal settings to reasonable defaults */
@@ -96,74 +97,71 @@ void set_term()
int fd;
struct termios tty;
- if ((fd = device_open(console, O_RDWR|O_NOCTTY)) < 0) {
- message(log, "can't open %s", console);
+ if ((fd = device_open(console, O_RDWR | O_NOCTTY)) < 0) {
+ message(log, "can't open %s\n", console);
return;
}
ioctl(fd, TCGETS, &tty);
- tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
- tty.c_cflag |= HUPCL|CLOCAL;
+ 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[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[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;
+ 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;
+ 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);
+ close(fd);
}
-static int
-mem_total()
+static int mem_total()
{
char s[80];
char *p;
FILE *f;
- const char pattern[]="MemTotal:";
+ const char pattern[] = "MemTotal:";
- f=fopen("/proc/meminfo","r");
- while (NULL != fgets(s,79,f)) {
- p=strstr(s, pattern);
+ f = fopen("/proc/meminfo", "r");
+ while (NULL != fgets(s, 79, f)) {
+ p = strstr(s, pattern);
if (NULL != p) {
fclose(f);
- return(atoi(p+strlen(pattern)));
+ return (atoi(p + strlen(pattern)));
}
}
return -1;
}
-static void
-set_free_pages()
+static void set_free_pages()
{
char s[80];
FILE *f;
- f=fopen("/proc/sys/vm/freepages","r");
- fgets(s,79,f);
+ f = fopen("/proc/sys/vm/freepages", "r");
+ fgets(s, 79, f);
if (atoi(s) < 32) {
fclose(f);
- f=fopen("/proc/sys/vm/freepages","w");
- fprintf(f,"30\t40\t50\n");
+ f = fopen("/proc/sys/vm/freepages", "w");
+ fprintf(f, "30\t40\t50\n");
printf("\nIncreased /proc/sys/vm/freepages values to 30/40/50\n");
}
fclose(f);
}
-static void
-console_init()
+static void console_init()
{
int fd;
int tried_devcons = 0;
@@ -176,7 +174,7 @@ console_init()
console = CONSOLE;
tried_devcons++;
}
- while ((fd = open(console, O_RDONLY|O_NONBLOCK)) < 0) {
+ while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) {
if (!tried_devcons) {
tried_devcons++;
console = CONSOLE;
@@ -195,41 +193,41 @@ console_init()
close(fd);
}
-static int
-waitfor(int pid)
+static int waitfor(int pid)
{
int status, 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);
+ 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)
+static int run(const char *command, char *terminal, int get_enter)
{
- int f, pid;
+ int f, pid;
char *args[16];
char buf[256];
- char* ptr;
- static const char press_enter[] =
+ char *ptr;
+ static const char press_enter[] =
"\nPlease press Enter to activate this console. ";
-
- /* Make a proper command from the command string */
+
+ /* Make a proper command from the command string */
strcpy(buf, command);
ptr = buf;
- for(f = 1; f < 15; f++) {
+ for (f = 1; f < 15; f++) {
/* Skip white space */
- while(*ptr == ' ' || *ptr == '\t') ptr++;
+ while (*ptr == ' ' || *ptr == '\t')
+ ptr++;
args[f] = ptr;
/* May be trailing space.. */
- if (*ptr == 0) break;
+ if (*ptr == 0)
+ break;
/* Skip this `word' */
- while(*ptr && *ptr != ' ' && *ptr != '\t' && *ptr != '#')
+ while (*ptr && *ptr != ' ' && *ptr != '\t' && *ptr != '#')
ptr++;
/* If end-of-line, break */
if (*ptr == '#' || *ptr == 0) {
@@ -241,7 +239,7 @@ run(const char* command, char* terminal, int get_enter)
args[f] = NULL;
}
args[0] = args[1];
-
+
if ((pid = fork()) == 0) {
/* Clean up */
@@ -250,8 +248,8 @@ run(const char* command, char* terminal, int get_enter)
close(2);
setsid();
- if ((f = device_open(terminal, O_RDWR|O_NOCTTY)) < 0) {
- message( log, "open(%s) failed: %s", terminal, strerror(errno));
+ if ((f = device_open(terminal, O_RDWR | O_NOCTTY)) < 0) {
+ message(log, "open(%s) failed: %s\n", terminal, strerror(errno));
return -1;
}
dup(f);
@@ -259,7 +257,7 @@ run(const char* command, char* terminal, int get_enter)
tcsetpgrp(0, getpgrp());
set_term();
- if ( get_enter ) {
+ 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
@@ -268,18 +266,21 @@ run(const char* command, char* terminal, int get_enter)
* be allowed to start a shell or whatever an init script
* specifies.
*/
- char c;
+ char c;
write(1, press_enter, sizeof(press_enter) - 1);
read(0, &c, 1);
+ message(console, "Got an enter\r\n");
}
/* Log the process name and args */
- message(log, "Executing '%s'\n", command);
+ message(console, "Executing ");
+ message(console, "'%s'\r\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);
+ message(console, "Hmm. Trying as a script.\r\n");
/* If shell scripts are not executed, force the issue */
if (errno == ENOEXEC) {
char buf[256];
@@ -291,18 +292,17 @@ run(const char* command, char* terminal, int get_enter)
args[4] = NULL;
execvp(args[1], args + 1);
}
- message(log, "Could not execute '%s'\n", command, strerror(errno));
+ message(console, "Could not execute '%s'\n", command);
exit(-1);
}
return pid;
}
#ifndef DEBUG_INIT
-static void
-shutdown_system(void)
+static void shutdown_system(void)
{
- message(console, "The system is going down NOW !!");
+ message(console, "The system is going down NOW !!\r\n");
sync();
/* Allow Ctrl-Alt-Del to reboot system. */
reboot(RB_ENABLE_CAD);
@@ -318,169 +318,151 @@ shutdown_system(void)
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) {
+ if (get_kernel_revision() <= 2 * 65536 + 2 * 256 + 11) {
/* Removed bdflush call, kupdate in kernels >2.2.11 */
bdflush(1, 0);
sync();
}
}
-static void
-halt_signal(int sig)
+static void halt_signal(int sig)
{
shutdown_system();
- message(console, "The system is halted. Press CTRL-ALT-DEL or turn off power\r\n");
- reboot( RB_POWER_OFF);
+ message(console,
+ "The system is halted. Press CTRL-ALT-DEL or turn off power\r\n");
+ reboot(RB_POWER_OFF);
exit(0);
}
-static void
-reboot_signal(int sig)
+static void reboot_signal(int sig)
{
shutdown_system();
message(console, "Please stand by while rebooting the system.\r\n");
- reboot( RB_AUTOBOOT);
+ reboot(RB_AUTOBOOT);
exit(0);
}
-#endif
-int setproctitle(char *fmt, ...)
-{
- 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;
-}
+#endif
-extern int
-init_main(int argc, char * * argv)
+extern int init_main(int argc, char **argv)
{
- 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]");
+ 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;
+ char *hello_msg_format =
+ "init started: BusyBox v%s (%s) multi-call binary\r\n";
+ const char *no_memory =
+ "Sorry, your computer does not have enough memory.\r\n";
#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(SIGTERM, reboot_signal);
+ /* 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(SIGTERM, reboot_signal);
#endif
- /* Figure out where the default console should be */
- console_init();
+ /* 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... */
+ /* 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);
+ reboot(RB_DISABLE_CAD);
#endif
- /* Close whatever files are open, and reset the console. */
- close(0);
- close(1);
- close(2);
- set_term();
- setsid();
-
- /* Make sure PATH is set to something sane */
- if (getenv("PATH") == NULL)
- putenv(PATH_DEFAULT);
-
- /* 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);
-
-
- /* Mount /proc */
- message(console, "Mounting /proc: \n");
- if (mount("/proc","/proc","proc",0,0)) {
- message(log, "%s: could not mount /proc!\n", argv[0]);
- message(console, "failed!\n");
- }
- message(console, "done.\n");
-
+ /* Close whatever files are open, and reset the console. */
+ close(0);
+ close(1);
+ close(2);
+ set_term();
+ setsid();
+
+ /* Make sure PATH is set to something sane */
+ if (getenv("PATH") == NULL)
+ putenv(PATH_DEFAULT);
+
+ /* Hello world */
+ message(log, hello_msg_format, BB_VER, BB_BT);
+ message(console, hello_msg_format, BB_VER, BB_BT);
+
+ /* Mount /proc */
+ if (mount("/proc", "/proc", "proc", 0, 0)) {
+ message(log, "Mounting /proc: failed!\n");
+ message(console, "Mounting /proc: failed!\r\n");
+ } else {
+ message(console, "Mounting /proc: done.\r\n");
+ }
- /* Make sure there is enough memory to do something useful*/
- set_free_pages();
- if (mem_total() < 2000) {
- int retval;
- retval= stat("/etc/fstab",&statbuf);
- if (retval) {
+ /* Make sure there is enough memory to do something useful */
+ set_free_pages();
+ if (mem_total() < 2000) {
+ int retval;
+ retval = stat("/etc/fstab", &statbuf);
+ if (retval) {
+ message(console, "%s", no_memory);
+ while (1) {
+ sleep(1);
+ }
+ } else {
+ /* Try to turn on swap */
+ waitfor(run("/bin/swapon -a", console, 0));
+ if (mem_total() < 2000) {
message(console, "%s", no_memory);
- while (1) { sleep(1);}
- } else {
- /* Try to turn on swap */
- waitfor(run("/bin/swapon -a", console, 0));
- if (mem_total() < 2000) {
- message(console, "%s", no_memory);
- while (1) { sleep(1);}
+ while (1) {
+ sleep(1);
}
}
}
+ }
- /* 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]");
- }
+ /* Check if we are supposed to be in single user mode */
+ if ( argc > 1 && (!strcmp(argv[1], "single") ||
+ !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
+ run_rc = FALSE;
+ tty0_commands = shell_commands;
+ tty1_commands = 0;
+ }
- /* 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 && *tty0_commands ) {
- pid1 = run(tty0_commands, console, 1);
- }
- if ( pid2 == 0 && *tty1_commands ) {
- pid2 = run(tty1_commands, second_terminal, 1);
- }
- wpid = wait(&status);
- if ( wpid > 0 && wpid != pid1) {
- message(log, "pid %d exited, status=%x.\n", wpid, status);
- }
- if ( wpid == pid2 ) {
- pid2 = 0;
- }
- sleep(1);
+ /* 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 && tty0_commands) {
+ pid1 = run(tty0_commands, console, 1);
}
+ if (pid2 == 0 && tty1_commands) {
+ pid2 = run(tty1_commands, second_terminal, 1);
+ }
+ wpid = wait(&status);
+ if (wpid > 0 && wpid != pid1) {
+ message(log, "pid %d exited, status=%x.\n", wpid, status);
+ }
+ /* Don't respawn an init script if it exits */
+ if (run_rc == FALSE && wpid == pid1) {
+ pid1 = 0;
+ }
+ if (wpid == pid2) {
+ pid2 = 0;
+ }
+ sleep(1);
+ }
}
-
generated by cgit v1.1 at 2024-12-27 10:48:38 +0000