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This commit is contained in:
Eric Andersen
1999-10-26 00:18:56 +00:00
parent 0460ff2e5d
commit 8a8fbb87f7
2 changed files with 382 additions and 418 deletions
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400
init.c
View File

@ -37,40 +37,39 @@
#include <sys/reboot.h> #include <sys/reboot.h>
#include <sys/kdaemon.h> #include <sys/kdaemon.h>
#include <sys/sysmacros.h> #include <sys/sysmacros.h>
#include <linux/serial.h> /* for serial_struct */ #include <linux/serial.h> /* for serial_struct */
#include <sys/vt.h> /* for vt_stat */ #include <sys/vt.h> /* for vt_stat */
#include <sys/ioctl.h> #include <sys/ioctl.h>
#define DEBUG_INIT #define DEBUG_INIT
#define CONSOLE "/dev/console" /* Logical system console */ #define CONSOLE "/dev/console" /* Logical system console */
#define VT_PRIMARY "/dev/tty0" /* Virtual console master */ #define VT_PRIMARY "/dev/tty0" /* Virtual console master */
#define VT_SECONDARY "/dev/tty1" /* Virtual console master */ #define VT_SECONDARY "/dev/tty1" /* Virtual console master */
#define VT_LOG "/dev/tty2" /* Virtual console master */ #define VT_LOG "/dev/tty2" /* Virtual console master */
#define SHELL "/bin/sh" /* Default shell */ #define SHELL "/bin/sh" /* Default shell */
#define INITSCRIPT "/etc/init.d/rcS" /* Initscript. */ #define INITSCRIPT "/etc/init.d/rcS" /* Initscript. */
#define PATH_DEFAULT "PATH=/usr/local/sbin:/sbin:/bin:/usr/sbin:/usr/bin" #define PATH_DEFAULT "PATH=/usr/local/sbin:/sbin:/bin:/usr/sbin:/usr/bin"
static int maxproclen=0; static char *console = CONSOLE;
static char* argv0; 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 */ /* 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; int m, f, fd = -1;
mode = m | O_NONBLOCK; mode = m | O_NONBLOCK;
/* Retry up to 5 times */ /* Retry up to 5 times */
for(f = 0; f < 5; f++) for (f = 0; f < 5; f++)
if ((fd = open(device, m)) >= 0) break; if ((fd = open(device, m)) >= 0)
if (fd < 0) return fd; break;
if (fd < 0)
return fd;
/* Set original flags. */ /* Set original flags. */
if (m != mode) if (m != mode)
fcntl(fd, F_SETFL, mode); fcntl(fd, F_SETFL, mode);
@ -78,16 +77,18 @@ int device_open(char* device, int mode)
} }
/* print a message to the specified device */ /* print a message to the specified device */
void message(char* device, char *fmt, ...) void message(char *device, char *fmt, ...)
{ {
int fd; int fd;
va_list arguments; 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); va_start(arguments, fmt);
vdprintf(fd, fmt, arguments); vdprintf(fd, fmt, arguments);
va_end(arguments); va_end(arguments);
} close(fd);
close( fd); } else
vprintf(fmt, arguments);
} }
/* Set terminal settings to reasonable defaults */ /* Set terminal settings to reasonable defaults */
@ -96,74 +97,71 @@ void set_term()
int fd; int fd;
struct termios tty; struct termios tty;
if ((fd = device_open(console, O_RDWR|O_NOCTTY)) < 0) { if ((fd = device_open(console, O_RDWR | O_NOCTTY)) < 0) {
message(log, "can't open %s", console); message(log, "can't open %s\n", console);
return; return;
} }
ioctl(fd, TCGETS, &tty); ioctl(fd, TCGETS, &tty);
tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD; tty.c_cflag &= CBAUD | CBAUDEX | CSIZE | CSTOPB | PARENB | PARODD;
tty.c_cflag |= HUPCL|CLOCAL; tty.c_cflag |= HUPCL | CLOCAL;
tty.c_cc[VINTR] = 3; tty.c_cc[VINTR] = 3;
tty.c_cc[VQUIT] = 28; tty.c_cc[VQUIT] = 28;
tty.c_cc[VERASE] = 127; tty.c_cc[VERASE] = 127;
tty.c_cc[VKILL] = 24; tty.c_cc[VKILL] = 24;
tty.c_cc[VEOF] = 4; tty.c_cc[VEOF] = 4;
tty.c_cc[VTIME] = 0; tty.c_cc[VTIME] = 0;
tty.c_cc[VMIN] = 1; tty.c_cc[VMIN] = 1;
tty.c_cc[VSTART] = 17; tty.c_cc[VSTART] = 17;
tty.c_cc[VSTOP] = 19; tty.c_cc[VSTOP] = 19;
tty.c_cc[VSUSP] = 26; tty.c_cc[VSUSP] = 26;
/* Set pre and post processing */ /* Set pre and post processing */
tty.c_iflag = IGNPAR|ICRNL|IXON|IXANY; tty.c_iflag = IGNPAR | ICRNL | IXON | IXANY;
tty.c_oflag = OPOST|ONLCR; tty.c_oflag = OPOST | ONLCR;
tty.c_lflag = ISIG|ICANON|ECHO|ECHOCTL|ECHOPRT|ECHOKE; tty.c_lflag = ISIG | ICANON | ECHO | ECHOCTL | ECHOPRT | ECHOKE;
/* Now set the terminal line. */ /* Now set the terminal line. */
ioctl(fd, TCSETS, &tty); ioctl(fd, TCSETS, &tty);
close( fd); close(fd);
} }
static int static int mem_total()
mem_total()
{ {
char s[80]; char s[80];
char *p; char *p;
FILE *f; FILE *f;
const char pattern[]="MemTotal:"; const char pattern[] = "MemTotal:";
f=fopen("/proc/meminfo","r"); f = fopen("/proc/meminfo", "r");
while (NULL != fgets(s,79,f)) { while (NULL != fgets(s, 79, f)) {
p=strstr(s, pattern); p = strstr(s, pattern);
if (NULL != p) { if (NULL != p) {
fclose(f); fclose(f);
return(atoi(p+strlen(pattern))); return (atoi(p + strlen(pattern)));
} }
} }
return -1; return -1;
} }
static void static void set_free_pages()
set_free_pages()
{ {
char s[80]; char s[80];
FILE *f; FILE *f;
f=fopen("/proc/sys/vm/freepages","r"); f = fopen("/proc/sys/vm/freepages", "r");
fgets(s,79,f); fgets(s, 79, f);
if (atoi(s) < 32) { if (atoi(s) < 32) {
fclose(f); fclose(f);
f=fopen("/proc/sys/vm/freepages","w"); f = fopen("/proc/sys/vm/freepages", "w");
fprintf(f,"30\t40\t50\n"); fprintf(f, "30\t40\t50\n");
printf("\nIncreased /proc/sys/vm/freepages values to 30/40/50\n"); printf("\nIncreased /proc/sys/vm/freepages values to 30/40/50\n");
} }
fclose(f); fclose(f);
} }
static void static void console_init()
console_init()
{ {
int fd; int fd;
int tried_devcons = 0; int tried_devcons = 0;
@ -176,7 +174,7 @@ console_init()
console = CONSOLE; console = CONSOLE;
tried_devcons++; tried_devcons++;
} }
while ((fd = open(console, O_RDONLY|O_NONBLOCK)) < 0) { while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) {
if (!tried_devcons) { if (!tried_devcons) {
tried_devcons++; tried_devcons++;
console = CONSOLE; console = CONSOLE;
@ -195,41 +193,41 @@ console_init()
close(fd); close(fd);
} }
static int static int waitfor(int pid)
waitfor(int pid)
{ {
int status, wpid; int status, wpid;
message(log, "Waiting for process %d.\n", pid); message(log, "Waiting for process %d.\n", pid);
while ( (wpid = wait(&status)) != pid ) { while ((wpid = wait(&status)) != pid) {
if ( wpid > 0 ) if (wpid > 0)
message(log,"pid %d exited, status=%x.\n", wpid, status); message(log, "pid %d exited, status=%x.\n", wpid, status);
} }
return wpid; return wpid;
} }
static int static int run(const char *command, char *terminal, int get_enter)
run(const char* command, char* terminal, int get_enter)
{ {
int f, pid; int f, pid;
char *args[16]; char *args[16];
char buf[256]; char buf[256];
char* ptr; char *ptr;
static const char press_enter[] = static const char press_enter[] =
"\nPlease press Enter to activate this console. "; "\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); strcpy(buf, command);
ptr = buf; ptr = buf;
for(f = 1; f < 15; f++) { for (f = 1; f < 15; f++) {
/* Skip white space */ /* Skip white space */
while(*ptr == ' ' || *ptr == '\t') ptr++; while (*ptr == ' ' || *ptr == '\t')
ptr++;
args[f] = ptr; args[f] = ptr;
/* May be trailing space.. */ /* May be trailing space.. */
if (*ptr == 0) break; if (*ptr == 0)
break;
/* Skip this `word' */ /* Skip this `word' */
while(*ptr && *ptr != ' ' && *ptr != '\t' && *ptr != '#') while (*ptr && *ptr != ' ' && *ptr != '\t' && *ptr != '#')
ptr++; ptr++;
/* If end-of-line, break */ /* If end-of-line, break */
if (*ptr == '#' || *ptr == 0) { if (*ptr == '#' || *ptr == 0) {
@ -241,7 +239,7 @@ run(const char* command, char* terminal, int get_enter)
args[f] = NULL; args[f] = NULL;
} }
args[0] = args[1]; args[0] = args[1];
if ((pid = fork()) == 0) { if ((pid = fork()) == 0) {
/* Clean up */ /* Clean up */
@ -250,8 +248,8 @@ run(const char* command, char* terminal, int get_enter)
close(2); close(2);
setsid(); setsid();
if ((f = device_open(terminal, O_RDWR|O_NOCTTY)) < 0) { if ((f = device_open(terminal, O_RDWR | O_NOCTTY)) < 0) {
message( log, "open(%s) failed: %s", terminal, strerror(errno)); message(log, "open(%s) failed: %s\n", terminal, strerror(errno));
return -1; return -1;
} }
dup(f); dup(f);
@ -259,7 +257,7 @@ run(const char* command, char* terminal, int get_enter)
tcsetpgrp(0, getpgrp()); tcsetpgrp(0, getpgrp());
set_term(); set_term();
if ( get_enter ) { if (get_enter) {
/* /*
* Save memory by not exec-ing anything large (like a shell) * Save memory by not exec-ing anything large (like a shell)
* before the user wants it. This is critical if swap is not * 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 * be allowed to start a shell or whatever an init script
* specifies. * specifies.
*/ */
char c; char c;
write(1, press_enter, sizeof(press_enter) - 1); write(1, press_enter, sizeof(press_enter) - 1);
read(0, &c, 1); read(0, &c, 1);
message(console, "Got an enter\r\n");
} }
/* Log the process name and args */ /* 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 /* Now run it. This should take over the PID, so nothing
* further in init.c should be run by this PID. */ * further in init.c should be run by this PID. */
execvp(args[1], args + 1); execvp(args[1], args + 1);
message(console, "Hmm. Trying as a script.\r\n");
/* If shell scripts are not executed, force the issue */ /* If shell scripts are not executed, force the issue */
if (errno == ENOEXEC) { if (errno == ENOEXEC) {
char buf[256]; char buf[256];
@ -291,18 +292,17 @@ run(const char* command, char* terminal, int get_enter)
args[4] = NULL; args[4] = NULL;
execvp(args[1], args + 1); 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); exit(-1);
} }
return pid; return pid;
} }
#ifndef DEBUG_INIT #ifndef DEBUG_INIT
static void static void shutdown_system(void)
shutdown_system(void)
{ {
message(console, "The system is going down NOW !!"); message(console, "The system is going down NOW !!\r\n");
sync(); sync();
/* Allow Ctrl-Alt-Del to reboot system. */ /* Allow Ctrl-Alt-Del to reboot system. */
reboot(RB_ENABLE_CAD); reboot(RB_ENABLE_CAD);
@ -318,169 +318,151 @@ shutdown_system(void)
waitfor(run("/bin/swapoff -a", console, 0)); waitfor(run("/bin/swapoff -a", console, 0));
waitfor(run("/bin/umount -a -n", console, 0)); waitfor(run("/bin/umount -a -n", console, 0));
sync(); 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 */ /* Removed bdflush call, kupdate in kernels >2.2.11 */
bdflush(1, 0); bdflush(1, 0);
sync(); sync();
} }
} }
static void static void halt_signal(int sig)
halt_signal(int sig)
{ {
shutdown_system(); shutdown_system();
message(console, "The system is halted. Press CTRL-ALT-DEL or turn off power\r\n"); message(console,
reboot( RB_POWER_OFF); "The system is halted. Press CTRL-ALT-DEL or turn off power\r\n");
reboot(RB_POWER_OFF);
exit(0); exit(0);
} }
static void static void reboot_signal(int sig)
reboot_signal(int sig)
{ {
shutdown_system(); shutdown_system();
message(console, "Please stand by while rebooting the system.\r\n"); message(console, "Please stand by while rebooting the system.\r\n");
reboot( RB_AUTOBOOT); reboot(RB_AUTOBOOT);
exit(0); exit(0);
} }
#endif #endif
int setproctitle(char *fmt, ...) extern int init_main(int argc, char **argv)
{ {
va_list ap; int run_rc = TRUE;
int len; int pid1 = 0;
char buf[256]; int pid2 = 0;
struct stat statbuf;
buf[0] = 0; const char *init_commands = SHELL "-c exec " INITSCRIPT;
va_start(ap, fmt); const char *shell_commands = SHELL;
len = vsprintf(buf, fmt, ap); const char *tty0_commands = init_commands;
va_end(ap); const char *tty1_commands = shell_commands;
memset(argv0, 0, maxproclen + 1); char *hello_msg_format =
strncpy(argv0, buf, maxproclen); "init started: BusyBox v%s (%s) multi-call binary\r\n";
return len; const char *no_memory =
} "Sorry, your computer does not have enough memory.\r\n";
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]");
#ifndef DEBUG_INIT #ifndef DEBUG_INIT
/* Set up sig handlers */ /* Set up sig handlers */
signal(SIGUSR1, halt_signal); signal(SIGUSR1, halt_signal);
signal(SIGSEGV, halt_signal); signal(SIGSEGV, halt_signal);
signal(SIGPWR, halt_signal); signal(SIGPWR, halt_signal);
signal(SIGALRM, halt_signal); signal(SIGALRM, halt_signal);
signal(SIGHUP, halt_signal); signal(SIGHUP, halt_signal);
signal(SIGUSR2, reboot_signal); signal(SIGUSR2, reboot_signal);
signal(SIGINT, reboot_signal); signal(SIGINT, reboot_signal);
signal(SIGTERM, reboot_signal); signal(SIGTERM, reboot_signal);
#endif #endif
/* Figure out where the default console should be */ /* Figure out where the default console should be */
console_init(); console_init();
/* Turn off rebooting via CTL-ALT-DEL -- we get a /* Turn off rebooting via CTL-ALT-DEL -- we get a
* SIGINT on CAD so we can shut things down gracefully... */ * SIGINT on CAD so we can shut things down gracefully... */
#ifndef DEBUG_INIT #ifndef DEBUG_INIT
reboot(RB_DISABLE_CAD); reboot(RB_DISABLE_CAD);
#endif #endif
/* Close whatever files are open, and reset the console. */ /* Close whatever files are open, and reset the console. */
close(0); close(0);
close(1); close(1);
close(2); close(2);
set_term(); set_term();
setsid(); setsid();
/* Make sure PATH is set to something sane */ /* Make sure PATH is set to something sane */
if (getenv("PATH") == NULL) if (getenv("PATH") == NULL)
putenv(PATH_DEFAULT); putenv(PATH_DEFAULT);
/* Hello world */ /* Hello world */
message(console, "%s started: BusyBox v%s (%s) multi-call binary", message(log, hello_msg_format, BB_VER, BB_BT);
argv[0], BB_VER, BB_BT); message(console, hello_msg_format, BB_VER, BB_BT);
message(log, "%s started: BusyBox v%s (%s) multi-call binary",
argv[0], 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");
}
/* Mount /proc */ /* Make sure there is enough memory to do something useful */
message(console, "Mounting /proc: \n"); set_free_pages();
if (mount("/proc","/proc","proc",0,0)) { if (mem_total() < 2000) {
message(log, "%s: could not mount /proc!\n", argv[0]); int retval;
message(console, "failed!\n"); retval = stat("/etc/fstab", &statbuf);
} if (retval) {
message(console, "done.\n"); message(console, "%s", no_memory);
while (1) {
sleep(1);
/* Make sure there is enough memory to do something useful*/ }
set_free_pages(); } else {
if (mem_total() < 2000) { /* Try to turn on swap */
int retval; waitfor(run("/bin/swapon -a", console, 0));
retval= stat("/etc/fstab",&statbuf); if (mem_total() < 2000) {
if (retval) {
message(console, "%s", no_memory); message(console, "%s", no_memory);
while (1) { sleep(1);} while (1) {
} else { sleep(1);
/* 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);}
} }
} }
} }
}
/* Check if we are supposed to be in single user mode */ /* Check if we are supposed to be in single user mode */
if (!strcmp(argv[1], "single") || !strcmp(argv[1], "-s") || !strcmp(argv[1], "1")) { if ( argc > 1 && (!strcmp(argv[1], "single") ||
run_rc = FALSE; !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
tty0_commands = shell_commands; run_rc = FALSE;
tty1_commands = 0; tty0_commands = shell_commands;
setproctitle("init [S]"); tty1_commands = 0;
} else { }
setproctitle("init [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) {
/* Make sure an init script exists before trying to run it */ pid2 = run(tty1_commands, second_terminal, 1);
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);
} }
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);
}
} }

400
init/init.c
View File

@ -37,40 +37,39 @@
#include <sys/reboot.h> #include <sys/reboot.h>
#include <sys/kdaemon.h> #include <sys/kdaemon.h>
#include <sys/sysmacros.h> #include <sys/sysmacros.h>
#include <linux/serial.h> /* for serial_struct */ #include <linux/serial.h> /* for serial_struct */
#include <sys/vt.h> /* for vt_stat */ #include <sys/vt.h> /* for vt_stat */
#include <sys/ioctl.h> #include <sys/ioctl.h>
#define DEBUG_INIT #define DEBUG_INIT
#define CONSOLE "/dev/console" /* Logical system console */ #define CONSOLE "/dev/console" /* Logical system console */
#define VT_PRIMARY "/dev/tty0" /* Virtual console master */ #define VT_PRIMARY "/dev/tty0" /* Virtual console master */
#define VT_SECONDARY "/dev/tty1" /* Virtual console master */ #define VT_SECONDARY "/dev/tty1" /* Virtual console master */
#define VT_LOG "/dev/tty2" /* Virtual console master */ #define VT_LOG "/dev/tty2" /* Virtual console master */
#define SHELL "/bin/sh" /* Default shell */ #define SHELL "/bin/sh" /* Default shell */
#define INITSCRIPT "/etc/init.d/rcS" /* Initscript. */ #define INITSCRIPT "/etc/init.d/rcS" /* Initscript. */
#define PATH_DEFAULT "PATH=/usr/local/sbin:/sbin:/bin:/usr/sbin:/usr/bin" #define PATH_DEFAULT "PATH=/usr/local/sbin:/sbin:/bin:/usr/sbin:/usr/bin"
static int maxproclen=0; static char *console = CONSOLE;
static char* argv0; 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 */ /* 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; int m, f, fd = -1;
mode = m | O_NONBLOCK; mode = m | O_NONBLOCK;
/* Retry up to 5 times */ /* Retry up to 5 times */
for(f = 0; f < 5; f++) for (f = 0; f < 5; f++)
if ((fd = open(device, m)) >= 0) break; if ((fd = open(device, m)) >= 0)
if (fd < 0) return fd; break;
if (fd < 0)
return fd;
/* Set original flags. */ /* Set original flags. */
if (m != mode) if (m != mode)
fcntl(fd, F_SETFL, mode); fcntl(fd, F_SETFL, mode);
@ -78,16 +77,18 @@ int device_open(char* device, int mode)
} }
/* print a message to the specified device */ /* print a message to the specified device */
void message(char* device, char *fmt, ...) void message(char *device, char *fmt, ...)
{ {
int fd; int fd;
va_list arguments; 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); va_start(arguments, fmt);
vdprintf(fd, fmt, arguments); vdprintf(fd, fmt, arguments);
va_end(arguments); va_end(arguments);
} close(fd);
close( fd); } else
vprintf(fmt, arguments);
} }
/* Set terminal settings to reasonable defaults */ /* Set terminal settings to reasonable defaults */
@ -96,74 +97,71 @@ void set_term()
int fd; int fd;
struct termios tty; struct termios tty;
if ((fd = device_open(console, O_RDWR|O_NOCTTY)) < 0) { if ((fd = device_open(console, O_RDWR | O_NOCTTY)) < 0) {
message(log, "can't open %s", console); message(log, "can't open %s\n", console);
return; return;
} }
ioctl(fd, TCGETS, &tty); ioctl(fd, TCGETS, &tty);
tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD; tty.c_cflag &= CBAUD | CBAUDEX | CSIZE | CSTOPB | PARENB | PARODD;
tty.c_cflag |= HUPCL|CLOCAL; tty.c_cflag |= HUPCL | CLOCAL;
tty.c_cc[VINTR] = 3; tty.c_cc[VINTR] = 3;
tty.c_cc[VQUIT] = 28; tty.c_cc[VQUIT] = 28;
tty.c_cc[VERASE] = 127; tty.c_cc[VERASE] = 127;
tty.c_cc[VKILL] = 24; tty.c_cc[VKILL] = 24;
tty.c_cc[VEOF] = 4; tty.c_cc[VEOF] = 4;
tty.c_cc[VTIME] = 0; tty.c_cc[VTIME] = 0;
tty.c_cc[VMIN] = 1; tty.c_cc[VMIN] = 1;
tty.c_cc[VSTART] = 17; tty.c_cc[VSTART] = 17;
tty.c_cc[VSTOP] = 19; tty.c_cc[VSTOP] = 19;
tty.c_cc[VSUSP] = 26; tty.c_cc[VSUSP] = 26;
/* Set pre and post processing */ /* Set pre and post processing */
tty.c_iflag = IGNPAR|ICRNL|IXON|IXANY; tty.c_iflag = IGNPAR | ICRNL | IXON | IXANY;
tty.c_oflag = OPOST|ONLCR; tty.c_oflag = OPOST | ONLCR;
tty.c_lflag = ISIG|ICANON|ECHO|ECHOCTL|ECHOPRT|ECHOKE; tty.c_lflag = ISIG | ICANON | ECHO | ECHOCTL | ECHOPRT | ECHOKE;
/* Now set the terminal line. */ /* Now set the terminal line. */
ioctl(fd, TCSETS, &tty); ioctl(fd, TCSETS, &tty);
close( fd); close(fd);
} }
static int static int mem_total()
mem_total()
{ {
char s[80]; char s[80];
char *p; char *p;
FILE *f; FILE *f;
const char pattern[]="MemTotal:"; const char pattern[] = "MemTotal:";
f=fopen("/proc/meminfo","r"); f = fopen("/proc/meminfo", "r");
while (NULL != fgets(s,79,f)) { while (NULL != fgets(s, 79, f)) {
p=strstr(s, pattern); p = strstr(s, pattern);
if (NULL != p) { if (NULL != p) {
fclose(f); fclose(f);
return(atoi(p+strlen(pattern))); return (atoi(p + strlen(pattern)));
} }
} }
return -1; return -1;
} }
static void static void set_free_pages()
set_free_pages()
{ {
char s[80]; char s[80];
FILE *f; FILE *f;
f=fopen("/proc/sys/vm/freepages","r"); f = fopen("/proc/sys/vm/freepages", "r");
fgets(s,79,f); fgets(s, 79, f);
if (atoi(s) < 32) { if (atoi(s) < 32) {
fclose(f); fclose(f);
f=fopen("/proc/sys/vm/freepages","w"); f = fopen("/proc/sys/vm/freepages", "w");
fprintf(f,"30\t40\t50\n"); fprintf(f, "30\t40\t50\n");
printf("\nIncreased /proc/sys/vm/freepages values to 30/40/50\n"); printf("\nIncreased /proc/sys/vm/freepages values to 30/40/50\n");
} }
fclose(f); fclose(f);
} }
static void static void console_init()
console_init()
{ {
int fd; int fd;
int tried_devcons = 0; int tried_devcons = 0;
@ -176,7 +174,7 @@ console_init()
console = CONSOLE; console = CONSOLE;
tried_devcons++; tried_devcons++;
} }
while ((fd = open(console, O_RDONLY|O_NONBLOCK)) < 0) { while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) {
if (!tried_devcons) { if (!tried_devcons) {
tried_devcons++; tried_devcons++;
console = CONSOLE; console = CONSOLE;
@ -195,41 +193,41 @@ console_init()
close(fd); close(fd);
} }
static int static int waitfor(int pid)
waitfor(int pid)
{ {
int status, wpid; int status, wpid;
message(log, "Waiting for process %d.\n", pid); message(log, "Waiting for process %d.\n", pid);
while ( (wpid = wait(&status)) != pid ) { while ((wpid = wait(&status)) != pid) {
if ( wpid > 0 ) if (wpid > 0)
message(log,"pid %d exited, status=%x.\n", wpid, status); message(log, "pid %d exited, status=%x.\n", wpid, status);
} }
return wpid; return wpid;
} }
static int static int run(const char *command, char *terminal, int get_enter)
run(const char* command, char* terminal, int get_enter)
{ {
int f, pid; int f, pid;
char *args[16]; char *args[16];
char buf[256]; char buf[256];
char* ptr; char *ptr;
static const char press_enter[] = static const char press_enter[] =
"\nPlease press Enter to activate this console. "; "\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); strcpy(buf, command);
ptr = buf; ptr = buf;
for(f = 1; f < 15; f++) { for (f = 1; f < 15; f++) {
/* Skip white space */ /* Skip white space */
while(*ptr == ' ' || *ptr == '\t') ptr++; while (*ptr == ' ' || *ptr == '\t')
ptr++;
args[f] = ptr; args[f] = ptr;
/* May be trailing space.. */ /* May be trailing space.. */
if (*ptr == 0) break; if (*ptr == 0)
break;
/* Skip this `word' */ /* Skip this `word' */
while(*ptr && *ptr != ' ' && *ptr != '\t' && *ptr != '#') while (*ptr && *ptr != ' ' && *ptr != '\t' && *ptr != '#')
ptr++; ptr++;
/* If end-of-line, break */ /* If end-of-line, break */
if (*ptr == '#' || *ptr == 0) { if (*ptr == '#' || *ptr == 0) {
@ -241,7 +239,7 @@ run(const char* command, char* terminal, int get_enter)
args[f] = NULL; args[f] = NULL;
} }
args[0] = args[1]; args[0] = args[1];
if ((pid = fork()) == 0) { if ((pid = fork()) == 0) {
/* Clean up */ /* Clean up */
@ -250,8 +248,8 @@ run(const char* command, char* terminal, int get_enter)
close(2); close(2);
setsid(); setsid();
if ((f = device_open(terminal, O_RDWR|O_NOCTTY)) < 0) { if ((f = device_open(terminal, O_RDWR | O_NOCTTY)) < 0) {
message( log, "open(%s) failed: %s", terminal, strerror(errno)); message(log, "open(%s) failed: %s\n", terminal, strerror(errno));
return -1; return -1;
} }
dup(f); dup(f);
@ -259,7 +257,7 @@ run(const char* command, char* terminal, int get_enter)
tcsetpgrp(0, getpgrp()); tcsetpgrp(0, getpgrp());
set_term(); set_term();
if ( get_enter ) { if (get_enter) {
/* /*
* Save memory by not exec-ing anything large (like a shell) * Save memory by not exec-ing anything large (like a shell)
* before the user wants it. This is critical if swap is not * 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 * be allowed to start a shell or whatever an init script
* specifies. * specifies.
*/ */
char c; char c;
write(1, press_enter, sizeof(press_enter) - 1); write(1, press_enter, sizeof(press_enter) - 1);
read(0, &c, 1); read(0, &c, 1);
message(console, "Got an enter\r\n");
} }
/* Log the process name and args */ /* 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 /* Now run it. This should take over the PID, so nothing
* further in init.c should be run by this PID. */ * further in init.c should be run by this PID. */
execvp(args[1], args + 1); execvp(args[1], args + 1);
message(console, "Hmm. Trying as a script.\r\n");
/* If shell scripts are not executed, force the issue */ /* If shell scripts are not executed, force the issue */
if (errno == ENOEXEC) { if (errno == ENOEXEC) {
char buf[256]; char buf[256];
@ -291,18 +292,17 @@ run(const char* command, char* terminal, int get_enter)
args[4] = NULL; args[4] = NULL;
execvp(args[1], args + 1); 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); exit(-1);
} }
return pid; return pid;
} }
#ifndef DEBUG_INIT #ifndef DEBUG_INIT
static void static void shutdown_system(void)
shutdown_system(void)
{ {
message(console, "The system is going down NOW !!"); message(console, "The system is going down NOW !!\r\n");
sync(); sync();
/* Allow Ctrl-Alt-Del to reboot system. */ /* Allow Ctrl-Alt-Del to reboot system. */
reboot(RB_ENABLE_CAD); reboot(RB_ENABLE_CAD);
@ -318,169 +318,151 @@ shutdown_system(void)
waitfor(run("/bin/swapoff -a", console, 0)); waitfor(run("/bin/swapoff -a", console, 0));
waitfor(run("/bin/umount -a -n", console, 0)); waitfor(run("/bin/umount -a -n", console, 0));
sync(); 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 */ /* Removed bdflush call, kupdate in kernels >2.2.11 */
bdflush(1, 0); bdflush(1, 0);
sync(); sync();
} }
} }
static void static void halt_signal(int sig)
halt_signal(int sig)
{ {
shutdown_system(); shutdown_system();
message(console, "The system is halted. Press CTRL-ALT-DEL or turn off power\r\n"); message(console,
reboot( RB_POWER_OFF); "The system is halted. Press CTRL-ALT-DEL or turn off power\r\n");
reboot(RB_POWER_OFF);
exit(0); exit(0);
} }
static void static void reboot_signal(int sig)
reboot_signal(int sig)
{ {
shutdown_system(); shutdown_system();
message(console, "Please stand by while rebooting the system.\r\n"); message(console, "Please stand by while rebooting the system.\r\n");
reboot( RB_AUTOBOOT); reboot(RB_AUTOBOOT);
exit(0); exit(0);
} }
#endif #endif
int setproctitle(char *fmt, ...) extern int init_main(int argc, char **argv)
{ {
va_list ap; int run_rc = TRUE;
int len; int pid1 = 0;
char buf[256]; int pid2 = 0;
struct stat statbuf;
buf[0] = 0; const char *init_commands = SHELL "-c exec " INITSCRIPT;
va_start(ap, fmt); const char *shell_commands = SHELL;
len = vsprintf(buf, fmt, ap); const char *tty0_commands = init_commands;
va_end(ap); const char *tty1_commands = shell_commands;
memset(argv0, 0, maxproclen + 1); char *hello_msg_format =
strncpy(argv0, buf, maxproclen); "init started: BusyBox v%s (%s) multi-call binary\r\n";
return len; const char *no_memory =
} "Sorry, your computer does not have enough memory.\r\n";
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]");
#ifndef DEBUG_INIT #ifndef DEBUG_INIT
/* Set up sig handlers */ /* Set up sig handlers */
signal(SIGUSR1, halt_signal); signal(SIGUSR1, halt_signal);
signal(SIGSEGV, halt_signal); signal(SIGSEGV, halt_signal);
signal(SIGPWR, halt_signal); signal(SIGPWR, halt_signal);
signal(SIGALRM, halt_signal); signal(SIGALRM, halt_signal);
signal(SIGHUP, halt_signal); signal(SIGHUP, halt_signal);
signal(SIGUSR2, reboot_signal); signal(SIGUSR2, reboot_signal);
signal(SIGINT, reboot_signal); signal(SIGINT, reboot_signal);
signal(SIGTERM, reboot_signal); signal(SIGTERM, reboot_signal);
#endif #endif
/* Figure out where the default console should be */ /* Figure out where the default console should be */
console_init(); console_init();
/* Turn off rebooting via CTL-ALT-DEL -- we get a /* Turn off rebooting via CTL-ALT-DEL -- we get a
* SIGINT on CAD so we can shut things down gracefully... */ * SIGINT on CAD so we can shut things down gracefully... */
#ifndef DEBUG_INIT #ifndef DEBUG_INIT
reboot(RB_DISABLE_CAD); reboot(RB_DISABLE_CAD);
#endif #endif
/* Close whatever files are open, and reset the console. */ /* Close whatever files are open, and reset the console. */
close(0); close(0);
close(1); close(1);
close(2); close(2);
set_term(); set_term();
setsid(); setsid();
/* Make sure PATH is set to something sane */ /* Make sure PATH is set to something sane */
if (getenv("PATH") == NULL) if (getenv("PATH") == NULL)
putenv(PATH_DEFAULT); putenv(PATH_DEFAULT);
/* Hello world */ /* Hello world */
message(console, "%s started: BusyBox v%s (%s) multi-call binary", message(log, hello_msg_format, BB_VER, BB_BT);
argv[0], BB_VER, BB_BT); message(console, hello_msg_format, BB_VER, BB_BT);
message(log, "%s started: BusyBox v%s (%s) multi-call binary",
argv[0], 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");
}
/* Mount /proc */ /* Make sure there is enough memory to do something useful */
message(console, "Mounting /proc: \n"); set_free_pages();
if (mount("/proc","/proc","proc",0,0)) { if (mem_total() < 2000) {
message(log, "%s: could not mount /proc!\n", argv[0]); int retval;
message(console, "failed!\n"); retval = stat("/etc/fstab", &statbuf);
} if (retval) {
message(console, "done.\n"); message(console, "%s", no_memory);
while (1) {
sleep(1);
/* Make sure there is enough memory to do something useful*/ }
set_free_pages(); } else {
if (mem_total() < 2000) { /* Try to turn on swap */
int retval; waitfor(run("/bin/swapon -a", console, 0));
retval= stat("/etc/fstab",&statbuf); if (mem_total() < 2000) {
if (retval) {
message(console, "%s", no_memory); message(console, "%s", no_memory);
while (1) { sleep(1);} while (1) {
} else { sleep(1);
/* 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);}
} }
} }
} }
}
/* Check if we are supposed to be in single user mode */ /* Check if we are supposed to be in single user mode */
if (!strcmp(argv[1], "single") || !strcmp(argv[1], "-s") || !strcmp(argv[1], "1")) { if ( argc > 1 && (!strcmp(argv[1], "single") ||
run_rc = FALSE; !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
tty0_commands = shell_commands; run_rc = FALSE;
tty1_commands = 0; tty0_commands = shell_commands;
setproctitle("init [S]"); tty1_commands = 0;
} else { }
setproctitle("init [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) {
/* Make sure an init script exists before trying to run it */ pid2 = run(tty1_commands, second_terminal, 1);
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);
} }
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);
}
} }