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Bunches of fixes. Typos, bugs, etc.

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Added 'gunzip -t'.  inittab support _almost_ works (but it isn't
ready for prime time useage yet).
 -Erik
This commit is contained in:
Erik Andersen
2000-01-04 01:10:25 +00:00
parent 9c88cac5cb
commit 7dc160721e
20 changed files with 781 additions and 578 deletions
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485
init.c
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@ -23,6 +23,7 @@
#include "internal.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
@ -55,22 +56,57 @@
#endif
#define VT_PRIMARY "/dev/tty1" /* Primary virtual console */
#define VT_SECONDARY "/dev/tty2" /* Virtual console */
#define VT_LOG "/dev/tty3" /* Virtual console */
#define SERIAL_CON0 "/dev/ttyS0" /* Primary serial console */
#define SERIAL_CON1 "/dev/ttyS1" /* Serial console */
#define GETTY "/sbin/getty" /* Default location of getty */
#define SHELL "/bin/sh" /* Default shell */
#define INITTAB "/etc/inittab" /* inittab file location */
#ifndef BB_INIT_SCRIPT
#define BB_INIT_SCRIPT "/etc/init.d/rcS" /* Initscript. */
#endif
#if 1
#define VT_PRIMARY "/dev/tty1" /* Primary virtual console */
#define VT_SECONDARY "/dev/tty2" /* Virtual console */
#define VT_LOG "/dev/tty3" /* Virtual console */
#define SERIAL_CON0 "/dev/ttyS0" /* Primary serial console */
#define SERIAL_CON1 "/dev/ttyS1" /* Serial console */
#define SHELL "/bin/sh" /* Default shell */
#define REBOOT "/sbin/reboot" /* Default ctrl-alt-del command */
#define INITTAB "/etc/inittab" /* inittab file location */
#define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
#define LOG 0x1
#define CONSOLE 0x2
/* Allowed init action types */
typedef enum {
SYSINIT=1,
CTRLALTDEL,
RESPAWN,
ASKFIRST,
WAIT,
ONCE
} initActionEnum;
/* And now a list of the actions we support in the version of init */
typedef struct initActionType{
const char* name;
initActionEnum action;
} initActionType;
static const struct initActionType actions[] = {
{"sysinit", SYSINIT},
{"ctrlaltdel", CTRLALTDEL},
{"respawn", RESPAWN},
{"askfirst", ASKFIRST},
{"wait", WAIT},
{"once", ONCE},
{0}
};
/* Set up a linked list of initactions, to be read from inittab */
typedef struct initActionTag initAction;
struct initActionTag {
pid_t pid;
char process[256];
char *console;
initAction *nextPtr;
initActionEnum action;
};
initAction* initActionList = NULL;
static char *console = _PATH_CONSOLE;
static char *second_console = VT_SECONDARY;
static char *log = VT_LOG;
@ -100,8 +136,9 @@ int device_open(char *device, int mode)
* device may be bitwise-or'd from LOG | CONSOLE */
void message(int device, char *fmt, ...)
{
int fd;
va_list arguments;
int fd;
#ifdef BB_SYSLOGD
/* Log the message to syslogd */
@ -298,16 +335,18 @@ static int waitfor(int pid)
}
static pid_t run(const char * const* command,
static pid_t run(char* command,
char *terminal, int get_enter)
{
int fd;
int i;
pid_t pid;
const char * const* cmd = command+1;
char* tmpCmd;
char* cmd[255];
static const char press_enter[] =
"\nPlease press Enter to activate this console. ";
if ((pid = fork()) == 0) {
int fd;
/* Clean up */
close(0);
close(1);
@ -321,7 +360,7 @@ static pid_t run(const char * const* command,
signal(SIGTERM, SIG_DFL);
if ((fd = device_open(terminal, O_RDWR)) < 0) {
message(LOG, "Bummer, can't open %s\r\n", terminal);
message(LOG|CONSOLE, "Bummer, can't open %s\r\n", terminal);
exit(-1);
}
dup(fd);
@ -340,21 +379,32 @@ static pid_t run(const char * const* command,
*/
char c;
message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\r\n",
*cmd, getpid(), terminal );
write(1, press_enter, sizeof(press_enter) - 1);
read(0, &c, 1);
command, getpid(), terminal );
write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
read(fileno(stdin), &c, 1);
}
/* Convert command (char*) into cmd (char**, one word per string) */
for (tmpCmd=command, i=0; (tmpCmd=strsep(&command, " \t")) != NULL;) {
if (*tmpCmd != '\0') {
cmd[i] = tmpCmd;
tmpCmd++;
i++;
}
}
cmd[i] = NULL;
/* Log the process name and args */
message(LOG|CONSOLE, "Starting pid %d, console %s: '", getpid(), terminal);
while ( *cmd) message(LOG|CONSOLE, "%s ", *cmd++);
message(LOG|CONSOLE, "'\r\n");
message(LOG, "Starting pid %d, console %s: '%s'\r\n",
getpid(), terminal, cmd[0]);
/* Now run it. The new program will take over this PID,
* so nothing further in init.c should be run. */
execvp(*command, (char**)command+1);
execvp(cmd[0], cmd);
message(LOG, "Bummer, could not run '%s'\n", command);
/* We're still here? Some error happened. */
message(LOG|CONSOLE, "Bummer, could not run '%s': %s\n", cmd[0],
strerror(errno));
exit(-1);
}
return pid;
@ -365,15 +415,13 @@ static pid_t run(const char * const* command,
static void check_memory()
{
struct stat statbuf;
const char* const swap_on_cmd[] =
{ "/bin/swapon", "swapon", "-a", 0};
if (mem_total() > 3500)
return;
if (stat("/etc/fstab", &statbuf) == 0) {
/* Try to turn on swap */
waitfor(run(swap_on_cmd, log, FALSE));
waitfor(run("/bin/swapon swapon -a", log, FALSE));
if (mem_total() < 3500)
goto goodnight;
} else
@ -385,33 +433,28 @@ goodnight:
while (1) sleep(1);
}
#ifndef DEBUG_INIT
static void shutdown_system(void)
{
const char* const swap_off_cmd[] = { "swapoff", "swapoff", "-a", 0};
const char* const umount_cmd[] = { "umount", "umount", "-a", 0};
#ifndef DEBUG_INIT
/* Allow Ctrl-Alt-Del to reboot system. */
reboot(RB_ENABLE_CAD);
#endif
message(CONSOLE, "\r\nThe system is going down NOW !!\r\n");
sync();
/* 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);
message(CONSOLE, "Disabling swap.\r\n");
waitfor(run( swap_off_cmd, console, FALSE));
waitfor(run( "swapoff -a", console, FALSE));
message(CONSOLE, "Unmounting filesystems.\r\n");
waitfor(run( umount_cmd, console, FALSE));
waitfor(run( "umount -a", console, FALSE));
sync();
if (kernel_version > 0 && kernel_version <= 2 * 65536 + 2 * 256 + 11) {
/* bdflush, kupdate not needed for kernels >2.2.11 */
@ -427,14 +470,12 @@ static void halt_signal(int sig)
message(CONSOLE,
"The system is halted. Press CTRL-ALT-DEL or turn off power\r\n");
sync();
#ifndef DEBUG_INIT
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
if (sig == SIGUSR2)
reboot(RB_POWER_OFF);
else
#endif
reboot(RB_HALT_SYSTEM);
#endif
reboot(RB_HALT_SYSTEM);
exit(0);
}
@ -443,64 +484,157 @@ static void reboot_signal(int sig)
shutdown_system();
message(CONSOLE, "Please stand by while rebooting the system.\r\n");
sync();
#ifndef DEBUG_INIT
reboot(RB_AUTOBOOT);
#endif
exit(0);
}
static void ctrl_alt_del_signal(int sig)
{
initAction* a;
/* Run whatever we are supposed to run */
for( a=initActionList ; a; a=a->nextPtr) {
if (a->action == CTRLALTDEL) {
waitfor(run(a->process, console, FALSE));
}
}
}
#endif
void new_initAction (const struct initActionType *a,
char* process, char* console)
{
initAction* newAction;
newAction = calloc ((size_t)(1), sizeof(initAction));
if (!newAction) {
fprintf(stderr, "Memory allocation failure\n");
while (1) sleep(1);
}
newAction->nextPtr = initActionList;
initActionList = newAction;
strncpy( newAction->process, process, 255);
newAction->action = a->action;
newAction->console = console;
newAction->pid = 0;
}
void delete_initAction (initAction *action)
{
initAction *a, *b=NULL;
for( a=initActionList ; a; b=a, a=a->nextPtr) {
if (a == action && b != NULL) {
b->nextPtr=a->nextPtr;
free( a);
break;
}
}
}
void parse_inittab(void)
{
FILE* file;
char buf[256];
char *p, *q, *r;
const struct initActionType *a = actions;
int foundIt;
file = fopen(INITTAB, "r");
if (file == NULL) {
/* No inittab file -- set up some default behavior */
/* Askfirst shell on tty1 */
new_initAction( &(actions[3]), SHELL, console );
/* Askfirst shell on tty2 */
if (second_console != NULL)
new_initAction( &(actions[3]), SHELL, second_console );
/* Control-alt-del */
new_initAction( &(actions[1]), REBOOT, console );
/* sysinit */
new_initAction( &(actions[0]), INIT_SCRIPT, console );
return;
}
while ( fgets(buf, 255, file) != NULL) {
foundIt=FALSE;
for(p = buf; *p == ' ' || *p == '\t'; p++);
if (*p == '#' || *p == '\n') continue;
/* Trim the trailing \n */
q = strrchr( p, '\n');
if (q != NULL)
*q='\0';
/* Skip past the ID field and the runlevel
* field (both are ignored) */
p = strchr( p, ':');
/* Now peal off the process field from the end
* of the string */
q = strrchr( p, ':');
if ( q == NULL || *(q+1) == '\0' ) {
fprintf(stderr, "Bad inittab entry: %s\n", buf);
continue;
} else {
*q='\0';
++q;
}
/* Now peal off the action field */
r = strrchr( p, ':');
if ( r == NULL || *(r+1) == '\0') {
fprintf(stderr, "Bad inittab entry: %s\n", buf);
continue;
} else {
++r;
}
/* Ok, now process it */
a = actions;
while (a->name != 0) {
if (strcmp(a->name, r) == 0) {
new_initAction( a, q, NULL);
foundIt=TRUE;
}
a++;
}
if (foundIt==TRUE)
continue;
else {
/* Choke on an unknown action */
fprintf(stderr, "Bad inittab entry: %s\n", buf);
}
}
return;
}
extern int init_main(int argc, char **argv)
{
int run_rc = FALSE;
initAction *a;
pid_t wpid;
int status;
int single = FALSE;
int wait_for_enter_tty1 = TRUE;
int wait_for_enter_tty2 = TRUE;
pid_t pid1 = 0;
pid_t pid2 = 0;
struct stat statbuf;
char which_vt1[30];
char which_vt2[30];
const char* const rc_script_command[] = { BB_INIT_SCRIPT, BB_INIT_SCRIPT, 0};
const char* const getty1_command[] = { GETTY, GETTY, "38400", which_vt1, 0};
const char* const getty2_command[] = { GETTY, GETTY, "38400", which_vt2, 0};
const char* const shell_command[] = { SHELL, "-" SHELL, 0};
const char* const* tty1_command = shell_command;
const char* const* tty2_command = shell_command;
#ifdef BB_INIT_CMD_IF_RC_SCRIPT_EXITS
const char* const rc_exit_command[] = { "BB_INIT_CMD_IF_RC_SCRIPT_EXITS",
"BB_INIT_CMD_IF_RC_SCRIPT_EXITS", 0 };
#endif
#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
#ifndef DEBUG_INIT
/* Expect to be PID 1 iff we are run as init (not linuxrc) */
if (getpid() != 1 && strstr(argv[0], "init")!=NULL ) {
usage( "init\n\nInit is the parent of all processes.\n\n"
"This version of init is designed to be run only by the kernel\n");
}
#endif
/* Set up sig handlers -- be sure to
* clear all of these in run() */
/* Set up sig handlers -- be sure to clear all of these in run() */
signal(SIGUSR1, halt_signal);
signal(SIGUSR2, reboot_signal);
signal(SIGINT, reboot_signal);
signal(SIGINT, ctrl_alt_del_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 */
console_init();
@ -517,9 +651,13 @@ extern int init_main(int argc, char **argv)
/* Hello world */
#ifndef DEBUG_INIT
message(CONSOLE|LOG, hello_msg_format, BB_VER, BB_BT);
message(CONSOLE|LOG,
"init started: BusyBox v%s (%s) multi-call binary\r\n",
BB_VER, BB_BT);
#else
message(CONSOLE|LOG, hello_msg_format, getpid(), BB_VER, BB_BT);
message(CONSOLE|LOG,
"init(%d) started: BusyBox v%s (%s) multi-call binary\r\n",
getpid(), BB_VER, BB_BT);
#endif
@ -537,150 +675,77 @@ extern int init_main(int argc, char **argv)
if ( argc > 1 && (!strcmp(argv[1], "single") ||
!strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
single = TRUE;
tty1_command = shell_command;
tty2_command = shell_command;
/* Ask first then start a shell on tty2 */
if (second_console != NULL)
new_initAction( &(actions[3]), SHELL, second_console);
/* Ask first then start a shell on tty1 */
new_initAction( &(actions[3]), SHELL, console);
} else {
/* Not in single user mode -- see what inittab says */
parse_inittab();
}
/* Make sure an init script exists before trying to run it */
if (single==FALSE && stat(BB_INIT_SCRIPT, &statbuf)==0) {
run_rc = TRUE;
wait_for_enter_tty1 = FALSE;
tty1_command = rc_script_command;
}
/* Make sure /sbin/getty exists before trying to run it */
if (stat(GETTY, &statbuf)==0) {
char* where;
/* First do tty2 */
wait_for_enter_tty2 = FALSE;
where = strrchr( second_console, '/');
if ( where != NULL) {
where++;
strncpy( which_vt2, where, sizeof(which_vt2));
}
tty2_command = getty2_command;
/* Now run everything that needs to be run */
/* Check on hooking a getty onto tty1 */
if (run_rc == FALSE && single==FALSE) {
wait_for_enter_tty1 = FALSE;
where = strrchr( console, '/');
if ( where != NULL) {
where++;
strncpy( which_vt1, where, sizeof(which_vt1));
}
tty1_command = getty1_command;
/* First run sysinit */
for( a=initActionList ; a; a=a->nextPtr) {
if (a->action == SYSINIT) {
waitfor(run(a->process, console, FALSE));
/* Now remove the "sysinit" entry from the list */
delete_initAction( a);
}
}
/* Next run anything that wants to block */
for( a=initActionList ; a; a=a->nextPtr) {
if (a->action == WAIT) {
waitfor(run(a->process, console, FALSE));
/* Now remove the "wait" entry from the list */
delete_initAction( a);
}
}
/* Next run anything to be run only once */
for( a=initActionList ; a; a=a->nextPtr) {
if (a->action == ONCE) {
run(a->process, console, FALSE);
/* Now remove the "once" entry from the list */
delete_initAction( a);
}
}
/* Ok, now launch the tty1_command and tty2_command */
/* Now run the looping stuff */
for (;;) {
pid_t wpid;
int status;
for( a=initActionList ; a; a=a->nextPtr) {
/* Only run stuff with pid==0. If they have
* a pid, that means they are still running */
if (a->pid == 0) {
switch(a->action) {
case RESPAWN:
/* run the respawn stuff */
a->pid = run(a->process, console, FALSE);
break;
case ASKFIRST:
/* run the askfirst stuff */
a->pid = waitfor(run(a->process, console, TRUE));
break;
/* silence the compiler's whining */
default:
break;
}
}
}
if (pid1 == 0 && tty1_command) {
pid1 = run(tty1_command, console, wait_for_enter_tty1);
}
#ifdef BB_FEATURE_INIT_SECOND_CONSOLE
if (pid2 == 0 && tty2_command && second_console) {
pid2 = run(tty2_command, second_console, wait_for_enter_tty2);
}
#endif
wpid = wait(&status);
/* Find out who died and clean up their corpse */
if (wpid > 0 ) {
message(LOG, "pid %d exited, status=%x.\n", wpid, status);
}
/* Don't respawn init script if it exits */
if (wpid == pid1) {
if (run_rc == FALSE) {
pid1 = 0;
for( a=initActionList ; a; a=a->nextPtr) {
if (a->pid==wpid) {
a->pid=0;
}
}
#ifdef BB_INIT_CMD_IF_RC_SCRIPT_EXITS
else {
pid1 = 0;
run_rc=FALSE;
wait_for_enter_tty1=TRUE;
tty1_command=rc_exit_command;
}
#endif
}
#ifdef BB_FEATURE_INIT_SECOND_CONSOLE
if (wpid == pid2) {
pid2 = 0;
}
#endif
sleep(1);
}
}
#else
void parse_inittab(void)
{
FILE* file;
char buf[256];
char action[256]="";
char process[256]="";
char *p, *q;
if ((file = fopen(INITTAB, "r")) < 0) {
/* No inittab file -- set up some default behavior */
/* FIXME */
return;
}
while ( fgets(buf, 255, file) != NULL) {
for(p = buf; *p == ' ' || *p == '\t'; p++);
if (*p == '#' || *p == '\n') continue;
/* Trim the trailing \n */
q = strrchr( p, '\n');
if (q != NULL)
*q='\0';
/* Skip past the ID field and the runlevel
* field (both are ignored) */
p = strchr( p, ':');
/* Now peal off the process field from the end
* of the string */
q = strrchr( p, ':');
if ( q == NULL || q+1 == NULL)
goto choke;
*q='\0';
strcpy( process, ++q);
fprintf(stderr, "process=%s\n", process);
/* Now peal off the action field */
q = strrchr( p, ':');
if ( q == NULL || q+1 == NULL)
goto choke;
strcpy( action, ++q);
fprintf(stderr, "action=%s\n", action);
/* Ok, now do the right thing */
}
return;
choke:
//message(CONSOLE, "Bad entry:");
fprintf(stderr, "Bad inittab entry: %s", buf);
while (1) sleep(1);
}
extern int init_main(int argc, char **argv)
{
parse_inittab();
exit( TRUE);
}
#endif