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Ha! Got init working.

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-Erik
This commit is contained in:
Eric Andersen 1999-11-01 23:59:44 +00:00
parent ff719d663e
commit 2f6c04f63c
7 changed files with 120 additions and 104 deletions
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6
Makefile
View File

@ -17,12 +17,12 @@
PROG=busybox
VERSION=0.31
VERSION=0.32
BUILDTIME=$(shell date "+%Y%m%d-%H%M")
# Comment out the following to make a debuggable build
# Leave this off for production use.
DODEBUG=true
DODEBUG=false
# If you want a static binary, turn this on. I can't think
# of many situations where anybody would ever want it static,
# but...
@ -34,7 +34,7 @@ ARCH=`uname -m | sed -e 's/i.86/i386/' | sed -e 's/sparc.*/sparc/'`
# -D_GNU_SOURCE is needed because environ is used in init.c
ifeq ($(DODEBUG),true)
CFLAGS=-Wall -g -D_GNU_SOURCE
CFLAGS=-Wall -g -D_GNU_SOURCE -DDEBUG_INIT
STRIP=
LDFLAGS=
else

8
busybox.def.h
View File

@ -15,12 +15,12 @@
#define BB_DMESG
//#define BB_DUTMP
//#define BB_FDFLUSH
//#define BB_FIND
//#define BB_FSCK_MINIX
//#define BB_MKFS_MINIX
#define BB_FIND
#define BB_FSCK_MINIX
#define BB_MKFS_MINIX
#define BB_CHVT
#define BB_DEALLOCVT
//#define BB_GREP
#define BB_GREP
//#define BB_HALT
#define BB_INIT
#define BB_KILL

4
busybox.spec
View File

@ -1,5 +1,5 @@
Name: busybox
Version: 0.29alpha
Version: 0.32
Release: 1
Group: System/Utilities
Summary: BusyBox is a tiny suite of Unix utilities in a multi-call binary.
@ -7,7 +7,7 @@ Copyright: GPL
Packager : Erik Andersen <andersen@lineo.com>
Conflicts: fileutils grep shellutils
Buildroot: /tmp/%{Name}-%{Version}
Source: busybox-0.29a1.tar.gz
Source: busybox-0.32.tar.gz
%Description
BusyBox is a suite of "tiny" Unix utilities in a multi-call binary. It

4
examples/busybox.spec
View File

@ -1,5 +1,5 @@
Name: busybox
Version: 0.29alpha
Version: 0.32
Release: 1
Group: System/Utilities
Summary: BusyBox is a tiny suite of Unix utilities in a multi-call binary.
@ -7,7 +7,7 @@ Copyright: GPL
Packager : Erik Andersen <andersen@lineo.com>
Conflicts: fileutils grep shellutils
Buildroot: /tmp/%{Name}-%{Version}
Source: busybox-0.29a1.tar.gz
Source: busybox-0.32.tar.gz
%Description
BusyBox is a suite of "tiny" Unix utilities in a multi-call binary. It

100
init.c
View File

@ -42,14 +42,15 @@
#include <sys/ioctl.h>
/* Turn this on to debug init so it won't reboot when killed */
#define DEBUG_INIT
//#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 INITSCRIPT "/etc/init.d/rcS" /* Initscript. */
#define INITSCRIPT "/tmp/foo.sh"
#define PATH_DEFAULT "PATH=/usr/local/sbin:/sbin:/bin:/usr/sbin:/usr/bin"
static char *console = CONSOLE;
@ -218,8 +219,9 @@ static int waitfor(int pid)
static pid_t run(const char * const* command,
char *terminal, int get_enter)
{
int i, f;
int fd;
pid_t pid;
const char * const* cmd = command;
static const char press_enter[] =
"\nPlease press Enter to activate this console. ";
@ -230,13 +232,22 @@ static pid_t run(const char * const* command,
close(2);
setsid();
f=open(terminal, O_RDWR);
dup(f);
dup(f);
/* Reset signal handlers set for parent process */
signal(SIGUSR1, SIG_DFL);
signal(SIGUSR2, SIG_DFL);
signal(SIGINT, SIG_DFL);
signal(SIGTERM, SIG_DFL);
if ((fd = device_open(terminal, O_RDWR)) < 0) {
message(log, "Bummer, can't open %s\r\n", terminal);
exit(-1);
}
dup(fd);
dup(fd);
tcsetpgrp(0, getpgrp());
set_term(0);
if (get_enter) {
if (get_enter==TRUE) {
/*
* Save memory by not exec-ing anything large (like a shell)
* before the user wants it. This is critical if swap is not
@ -251,51 +262,45 @@ static pid_t run(const char * const* command,
}
/* Log the process name and args */
message(log, "Executing pid(%d): '", getpid());
while ( *cmd) message(log, "%s ", *cmd++);
message(log, "'\r\n");
/* Now run it. The new program will take over this PID,
* so nothing further in init.c should be run. */
message(log, "Executing '%s', pid(%d)\r\n", *command, getpid());
execvp(*command, (char**)command+1);
message(log, "Hmm. Trying as a script.\r\n");
/* If shell scripts are not executed, force the issue */
if (errno == ENOEXEC) {
char * args[16];
args[0] = SHELL;
args[1] = "-c";
args[2] = "exec";
for( i=0 ; i<16 && command[i]; i++)
args[3+i] = (char*)command[i];
args[i] = NULL;
execvp(*args, (char**)args+1);
}
message(log, "Could not execute '%s'\n", command);
message(log, "Bummer, could not execute '%s'\n", command);
exit(-1);
}
return pid;
}
#ifndef DEBUG_INIT
static void shutdown_system(void)
{
const char* const swap_off_cmd[] = { "/bin/swapoff", "-a", 0};
const char* const umount_cmd[] = { "/bin/umount", "-a", "-n", 0};
const char* const swap_off_cmd[] = { "swapoff", "swapoff", "-a", 0};
const char* const umount_cmd[] = { "umount", "umount", "-a", "-n", 0};
message(console, "The system is going down NOW !!\r\n");
sync();
#ifndef DEBUG_INIT
/* Allow Ctrl-Alt-Del to reboot system. */
reboot(RB_ENABLE_CAD);
#endif
/* 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);
waitfor(run( swap_off_cmd, console, 0));
waitfor(run( umount_cmd, console, 0));
waitfor(run( swap_off_cmd, log, FALSE));
waitfor(run( umount_cmd, log, FALSE));
sync();
if (get_kernel_revision() <= 2 * 65536 + 2 * 256 + 11) {
/* Removed bdflush call, kupdate in kernels >2.2.11 */
@ -309,7 +314,9 @@ static void halt_signal(int sig)
shutdown_system();
message(console,
"The system is halted. Press CTRL-ALT-DEL or turn off power\r\n");
#ifndef DEBUG_INIT
reboot(RB_POWER_OFF);
#endif
exit(0);
}
@ -317,45 +324,44 @@ static void reboot_signal(int sig)
{
shutdown_system();
message(console, "Please stand by while rebooting the system.\r\n");
#ifndef DEBUG_INIT
reboot(RB_AUTOBOOT);
#endif
exit(0);
}
#endif
extern int init_main(int argc, char **argv)
{
int run_rc = TRUE;
int wait_for_enter = FALSE;
pid_t pid1 = 0;
pid_t pid2 = 0;
struct stat statbuf;
const char* const swap_on_cmd[] = { "/bin/swapon", " -a ", 0};
const char* const init_commands[] = { SHELL, " -c", " exec ", INITSCRIPT, 0};
const char* const shell_commands[] = { SHELL, " -", 0};
const char* const swap_on_cmd[] = { "/bin/swapon", "swapon", "-a", 0};
const char* const init_commands[] = { INITSCRIPT, INITSCRIPT, 0};
const char* const shell_commands[] = { SHELL, "-" SHELL, 0};
const char* const* tty0_commands = init_commands;
const char* const* tty1_commands = shell_commands;
#ifndef DEBUG_INIT
char *hello_msg_format =
"init started: BusyBox v%s (%s) multi-call binary\r\n";
#else
#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
const char *no_memory =
"Sorry, your computer does not have enough memory.\r\n";
#ifndef DEBUG_INIT
/* Set up sig handlers */
/* Set up sig handlers -- be sure to
* clear all of these in run() */
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);
/* 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 */
@ -383,7 +389,7 @@ extern int init_main(int argc, char **argv)
/* Mount /proc */
if (mount("/proc", "/proc", "proc", 0, 0) == 0) {
if (mount ("proc", "/proc", "proc", 0, 0) == 0) {
message(log, "Mounting /proc: done.\n");
message(console, "Mounting /proc: done.\n");
} else {
@ -403,7 +409,7 @@ extern int init_main(int argc, char **argv)
}
} else {
/* Try to turn on swap */
waitfor(run(swap_on_cmd, console, 0));
waitfor(run(swap_on_cmd, log, FALSE));
if (mem_total() < 2000) {
message(console, "%s", no_memory);
while (1) {
@ -417,12 +423,14 @@ extern int init_main(int argc, char **argv)
if ( argc > 1 && (!strcmp(argv[1], "single") ||
!strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
run_rc = FALSE;
wait_for_enter = TRUE;
tty0_commands = shell_commands;
tty1_commands = shell_commands;
}
/* Make sure an init script exists before trying to run it */
if (run_rc == TRUE && stat(INITSCRIPT, &statbuf)) {
wait_for_enter = TRUE;
tty0_commands = shell_commands;
tty1_commands = shell_commands;
}
@ -435,10 +443,10 @@ extern int init_main(int argc, char **argv)
int status;
if (pid1 == 0 && tty0_commands) {
pid1 = run(tty0_commands, console, 1);
pid1 = run(tty0_commands, console, wait_for_enter);
}
if (pid2 == 0 && tty1_commands) {
pid2 = run(tty1_commands, second_terminal, 1);
pid2 = run(tty1_commands, second_terminal, TRUE);
}
wpid = wait(&status);
if (wpid > 0 ) {

100
init/init.c
View File

@ -42,14 +42,15 @@
#include <sys/ioctl.h>
/* Turn this on to debug init so it won't reboot when killed */
#define DEBUG_INIT
//#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 INITSCRIPT "/etc/init.d/rcS" /* Initscript. */
#define INITSCRIPT "/tmp/foo.sh"
#define PATH_DEFAULT "PATH=/usr/local/sbin:/sbin:/bin:/usr/sbin:/usr/bin"
static char *console = CONSOLE;
@ -218,8 +219,9 @@ static int waitfor(int pid)
static pid_t run(const char * const* command,
char *terminal, int get_enter)
{
int i, f;
int fd;
pid_t pid;
const char * const* cmd = command;
static const char press_enter[] =
"\nPlease press Enter to activate this console. ";
@ -230,13 +232,22 @@ static pid_t run(const char * const* command,
close(2);
setsid();
f=open(terminal, O_RDWR);
dup(f);
dup(f);
/* Reset signal handlers set for parent process */
signal(SIGUSR1, SIG_DFL);
signal(SIGUSR2, SIG_DFL);
signal(SIGINT, SIG_DFL);
signal(SIGTERM, SIG_DFL);
if ((fd = device_open(terminal, O_RDWR)) < 0) {
message(log, "Bummer, can't open %s\r\n", terminal);
exit(-1);
}
dup(fd);
dup(fd);
tcsetpgrp(0, getpgrp());
set_term(0);
if (get_enter) {
if (get_enter==TRUE) {
/*
* Save memory by not exec-ing anything large (like a shell)
* before the user wants it. This is critical if swap is not
@ -251,51 +262,45 @@ static pid_t run(const char * const* command,
}
/* Log the process name and args */
message(log, "Executing pid(%d): '", getpid());
while ( *cmd) message(log, "%s ", *cmd++);
message(log, "'\r\n");
/* Now run it. The new program will take over this PID,
* so nothing further in init.c should be run. */
message(log, "Executing '%s', pid(%d)\r\n", *command, getpid());
execvp(*command, (char**)command+1);
message(log, "Hmm. Trying as a script.\r\n");
/* If shell scripts are not executed, force the issue */
if (errno == ENOEXEC) {
char * args[16];
args[0] = SHELL;
args[1] = "-c";
args[2] = "exec";
for( i=0 ; i<16 && command[i]; i++)
args[3+i] = (char*)command[i];
args[i] = NULL;
execvp(*args, (char**)args+1);
}
message(log, "Could not execute '%s'\n", command);
message(log, "Bummer, could not execute '%s'\n", command);
exit(-1);
}
return pid;
}
#ifndef DEBUG_INIT
static void shutdown_system(void)
{
const char* const swap_off_cmd[] = { "/bin/swapoff", "-a", 0};
const char* const umount_cmd[] = { "/bin/umount", "-a", "-n", 0};
const char* const swap_off_cmd[] = { "swapoff", "swapoff", "-a", 0};
const char* const umount_cmd[] = { "umount", "umount", "-a", "-n", 0};
message(console, "The system is going down NOW !!\r\n");
sync();
#ifndef DEBUG_INIT
/* Allow Ctrl-Alt-Del to reboot system. */
reboot(RB_ENABLE_CAD);
#endif
/* 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);
waitfor(run( swap_off_cmd, console, 0));
waitfor(run( umount_cmd, console, 0));
waitfor(run( swap_off_cmd, log, FALSE));
waitfor(run( umount_cmd, log, FALSE));
sync();
if (get_kernel_revision() <= 2 * 65536 + 2 * 256 + 11) {
/* Removed bdflush call, kupdate in kernels >2.2.11 */
@ -309,7 +314,9 @@ static void halt_signal(int sig)
shutdown_system();
message(console,
"The system is halted. Press CTRL-ALT-DEL or turn off power\r\n");
#ifndef DEBUG_INIT
reboot(RB_POWER_OFF);
#endif
exit(0);
}
@ -317,45 +324,44 @@ static void reboot_signal(int sig)
{
shutdown_system();
message(console, "Please stand by while rebooting the system.\r\n");
#ifndef DEBUG_INIT
reboot(RB_AUTOBOOT);
#endif
exit(0);
}
#endif
extern int init_main(int argc, char **argv)
{
int run_rc = TRUE;
int wait_for_enter = FALSE;
pid_t pid1 = 0;
pid_t pid2 = 0;
struct stat statbuf;
const char* const swap_on_cmd[] = { "/bin/swapon", " -a ", 0};
const char* const init_commands[] = { SHELL, " -c", " exec ", INITSCRIPT, 0};
const char* const shell_commands[] = { SHELL, " -", 0};
const char* const swap_on_cmd[] = { "/bin/swapon", "swapon", "-a", 0};
const char* const init_commands[] = { INITSCRIPT, INITSCRIPT, 0};
const char* const shell_commands[] = { SHELL, "-" SHELL, 0};
const char* const* tty0_commands = init_commands;
const char* const* tty1_commands = shell_commands;
#ifndef DEBUG_INIT
char *hello_msg_format =
"init started: BusyBox v%s (%s) multi-call binary\r\n";
#else
#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
const char *no_memory =
"Sorry, your computer does not have enough memory.\r\n";
#ifndef DEBUG_INIT
/* Set up sig handlers */
/* Set up sig handlers -- be sure to
* clear all of these in run() */
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);
/* 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 */
@ -383,7 +389,7 @@ extern int init_main(int argc, char **argv)
/* Mount /proc */
if (mount("/proc", "/proc", "proc", 0, 0) == 0) {
if (mount ("proc", "/proc", "proc", 0, 0) == 0) {
message(log, "Mounting /proc: done.\n");
message(console, "Mounting /proc: done.\n");
} else {
@ -403,7 +409,7 @@ extern int init_main(int argc, char **argv)
}
} else {
/* Try to turn on swap */
waitfor(run(swap_on_cmd, console, 0));
waitfor(run(swap_on_cmd, log, FALSE));
if (mem_total() < 2000) {
message(console, "%s", no_memory);
while (1) {
@ -417,12 +423,14 @@ extern int init_main(int argc, char **argv)
if ( argc > 1 && (!strcmp(argv[1], "single") ||
!strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
run_rc = FALSE;
wait_for_enter = TRUE;
tty0_commands = shell_commands;
tty1_commands = shell_commands;
}
/* Make sure an init script exists before trying to run it */
if (run_rc == TRUE && stat(INITSCRIPT, &statbuf)) {
wait_for_enter = TRUE;
tty0_commands = shell_commands;
tty1_commands = shell_commands;
}
@ -435,10 +443,10 @@ extern int init_main(int argc, char **argv)
int status;
if (pid1 == 0 && tty0_commands) {
pid1 = run(tty0_commands, console, 1);
pid1 = run(tty0_commands, console, wait_for_enter);
}
if (pid2 == 0 && tty1_commands) {
pid2 = run(tty1_commands, second_terminal, 1);
pid2 = run(tty1_commands, second_terminal, TRUE);
}
wpid = wait(&status);
if (wpid > 0 ) {

2
utility.c
View File

@ -60,7 +60,7 @@ get_kernel_revision()
file = fopen(filename,"r");
if (file == NULL) {
perror(filename);
/* bummer, /proc must not be mounted... */
return( 0);
}
fscanf(file,"%d.%d.%d",&major,&minor,&patch);