Diff of /trunk/mkinitrd-magellan/busybox/init/init.c

Parent Directory | Revision Log | Patch

	revision 815 by niro, Sat Sep 1 22:45:15 2007 UTC	revision 816 by niro, Fri Apr 24 18:33:46 2009 UTC
#	Line 9	Line 9
9	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
10	*/	*/
11
12	#include "busybox.h"	#include "libbb.h"
13	#include <errno.h>	#include <syslog.h>
14	#include <paths.h>	#include <paths.h>
	#include <signal.h>
	#include <sys/ioctl.h>
	#include <sys/wait.h>
15	#include <sys/reboot.h>	#include <sys/reboot.h>
16
17	#include "init_shared.h"	/* Was a CONFIG_xxx option. A lot of people were building
18		* not fully functional init by switching it on! */
19		#define DEBUG_INIT 0
20
21	#if ENABLE_SYSLOGD	#define COMMAND_SIZE 256
22	# include <sys/syslog.h>	#define CONSOLE_NAME_SIZE 32
23	#endif	#define MAXENV 16 /* Number of env. vars */
	#define INIT_BUFFS_SIZE 256
	/* From <linux/vt.h> */
	struct vt_stat {
	unsigned short v_active; /* active vt */
	unsigned short v_signal; /* signal to send */
	unsigned short v_state; /* vt bitmask */
	};
	enum { VT_GETSTATE = 0x5603 }; /* get global vt state info */
	/* From <linux/serial.h> */
	struct serial_struct {
	int type;
	int line;
	unsigned int port;
	int irq;
	int flags;
	int xmit_fifo_size;
	int custom_divisor;
	int baud_base;
	unsigned short close_delay;
	char io_type;
	char reserved_char[1];
	int hub6;
	unsigned short closing_wait; /* time to wait before closing */
	unsigned short closing_wait2; /* no longer used... */
	unsigned char *iomem_base;
	unsigned short iomem_reg_shift;
	unsigned int port_high;
	unsigned long iomap_base; /* cookie passed into ioremap */
	int reserved[1];
	};
	#ifndef _PATH_STDPATH
	#define _PATH_STDPATH "/usr/bin:/bin:/usr/sbin:/sbin"
	#endif
24
	#if ENABLE_FEATURE_INIT_COREDUMPS
25	/*	/*
26	* When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called	* When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called
27	* before processes are spawned to set core file size as unlimited.	* before processes are spawned to set core file size as unlimited.
#	Line 69  struct serial_struct {	Line 30  struct serial_struct {
30	*/	*/
31	#define CORE_ENABLE_FLAG_FILE "/.init_enable_core"	#define CORE_ENABLE_FLAG_FILE "/.init_enable_core"
32	#include <sys/resource.h>	#include <sys/resource.h>
	#endif
33
34	#define INITTAB      "/etc/inittab" /* inittab file location */	#define INITTAB      "/etc/inittab" /* inittab file location */
35	#ifndef INIT_SCRIPT	#ifndef INIT_SCRIPT
36	#define INIT_SCRIPT  "/etc/init.d/rcS" /* Default sysinit script. */	#define INIT_SCRIPT  "/etc/init.d/rcS" /* Default sysinit script. */
37	#endif	#endif
38
	#define MAXENV 16 /* Number of env. vars */
	#define CONSOLE_BUFF_SIZE 32
39	/* Allowed init action types */	/* Allowed init action types */
40	#define SYSINIT     0x001	#define SYSINIT     0x01
41	#define RESPAWN     0x002	#define RESPAWN     0x02
42	#define ASKFIRST    0x004	/* like respawn, but wait for <Enter> to be pressed on tty: */
43	#define WAIT        0x008	#define ASKFIRST    0x04
44	#define ONCE        0x010	#define WAIT        0x08
45	#define CTRLALTDEL  0x020	#define ONCE        0x10
46	#define SHUTDOWN    0x040	#define CTRLALTDEL  0x20
47	#define RESTART     0x080	#define SHUTDOWN    0x40
48		#define RESTART     0x80
	/* A mapping between "inittab" action name strings and action type codes. */
	struct init_action_type {
	const char *name;
	int action;
	};
	static const struct init_action_type actions[] = {
	{"sysinit", SYSINIT},
	{"respawn", RESPAWN},
	{"askfirst", ASKFIRST},
	{"wait", WAIT},
	{"once", ONCE},
	{"ctrlaltdel", CTRLALTDEL},
	{"shutdown", SHUTDOWN},
	{"restart", RESTART},
	{0, 0}
	};
49
50	/* Set up a linked list of init_actions, to be read from inittab */	/* Set up a linked list of init_actions, to be read from inittab */
51	struct init_action {	struct init_action {
	pid_t pid;
	char command[INIT_BUFFS_SIZE];
	char terminal[CONSOLE_BUFF_SIZE];
52	struct init_action *next;	struct init_action *next;
53	int action;	pid_t pid;
54		uint8_t action_type;
55		char terminal[CONSOLE_NAME_SIZE];
56		char command[COMMAND_SIZE];
57	};	};
58
59	/* Static variables */	/* Static variables */
60	static struct init_action *init_action_list = NULL;	static struct init_action *init_action_list = NULL;
	static char console[CONSOLE_BUFF_SIZE] = CONSOLE_DEV;
61
62	#if !ENABLE_SYSLOGD	static const char *log_console = VC_5;
	static char *log_console = VC_5;
	#endif
	#if !ENABLE_DEBUG_INIT
	static sig_atomic_t got_cont = 0;
	#endif
63
64	enum {	enum {
65	LOG = 0x1,	L_LOG = 0x1,
66	CONSOLE = 0x2,	L_CONSOLE = 0x2,
67
68	#if ENABLE_FEATURE_EXTRA_QUIET	#if ENABLE_FEATURE_EXTRA_QUIET
69	MAYBE_CONSOLE = 0x0,	MAYBE_CONSOLE = 0x0,
70	#else	#else
71	MAYBE_CONSOLE = CONSOLE,	MAYBE_CONSOLE = L_CONSOLE,
72	#endif	#endif
73
74	#ifndef RB_HALT_SYSTEM	#ifndef RB_HALT_SYSTEM
#	Line 147  enum {	Line 80  enum {
80	#endif	#endif
81	};	};
82
	static const char * const environment[] = {
	"HOME=/",
	"PATH=" _PATH_STDPATH,
	"SHELL=/bin/sh",
	"USER=root",
	NULL
	};
83	/* Function prototypes */	/* Function prototypes */
84	static void delete_init_action(struct init_action *a);	static void halt_reboot_pwoff(int sig) NORETURN;
	static int waitfor(const struct init_action *a, pid_t pid);
	#if !ENABLE_DEBUG_INIT
	static void shutdown_signal(int sig);
	#endif
85
86	#if !ENABLE_DEBUG_INIT	static void waitfor(pid_t pid)
87		{
88		/* waitfor(run(x)): protect against failed fork inside run() */
89		if (pid <= 0)
90		return;
91
92		/* Wait for any child (prevent zombies from exiting orphaned processes)
93		* but exit the loop only when specified one has exited. */
94		while (wait(NULL) != pid)
95		continue;
96		}
97
98		static void loop_forever(void) NORETURN;
99	static void loop_forever(void)	static void loop_forever(void)
100	{	{
101	while (1)	while (1)
102	sleep(1);	sleep(1);
103	}	}
	#endif
104
105	/* Print a message to the specified device.	/* Print a message to the specified device.
106	* Device may be bitwise-or'd from LOG | CONSOLE */	* "where" may be bitwise-or'd from L_LOG | L_CONSOLE
107	#if ENABLE_DEBUG_INIT	* NB: careful, we can be called after vfork!
108	#define messageD message	*/
109	#else	#define messageD(...) do { if (DEBUG_INIT) message(__VA_ARGS__); } while (0)
110	#define messageD(...)  do {} while (0)	static void message(int where, const char *fmt, ...)
	#endif
	static void message(int device, const char *fmt, ...)
111	__attribute__ ((format(printf, 2, 3)));	__attribute__ ((format(printf, 2, 3)));
112	static void message(int device, const char *fmt, ...)	static void message(int where, const char *fmt, ...)
113	{	{
	va_list arguments;
	int l;
	RESERVE_CONFIG_BUFFER(msg, 1024);
	#if !ENABLE_SYSLOGD
114	static int log_fd = -1;	static int log_fd = -1;
115	#endif	va_list arguments;
116		unsigned l;
117		char msg[128];
118
119	msg[0] = '\r';	msg[0] = '\r';
120	va_start(arguments, fmt);	va_start(arguments, fmt);
121	l = vsnprintf(msg + 1, 1024 - 2, fmt, arguments) + 1;	l = 1 + vsnprintf(msg + 1, sizeof(msg) - 2, fmt, arguments);
122	va_end(arguments);	if (l > sizeof(msg) - 1)
123		l = sizeof(msg) - 1;
124	#if ENABLE_SYSLOGD	msg[l] = '\0';
125	/* Log the message to syslogd */	va_end(arguments);
126	if (device & LOG) {
127	/* don`t out "\r\n" */	if (ENABLE_FEATURE_INIT_SYSLOG) {
128	openlog(applet_name, 0, LOG_DAEMON);	if (where & L_LOG) {
129	syslog(LOG_INFO, "%s", msg + 1);	/* Log the message to syslogd */
130	closelog();	openlog("init", 0, LOG_DAEMON);
131	}	/* don't print "\r" */
132		syslog(LOG_INFO, "%s", msg + 1);
133	msg[l++] = '\n';	closelog();
134	msg[l] = 0;	}
135	#else	msg[l++] = '\n';
136		msg[l] = '\0';
137	msg[l++] = '\n';	} else {
138	msg[l] = 0;	msg[l++] = '\n';
139	/* Take full control of the log tty, and never close it.	msg[l] = '\0';
140	* It's mine, all mine!  Muhahahaha! */	/* Take full control of the log tty, and never close it.
141	if (log_fd < 0) {	* It's mine, all mine!  Muhahahaha! */
142	if ((log_fd = device_open(log_console, O_RDWR | O_NONBLOCK | O_NOCTTY)) < 0) {	if (log_fd < 0) {
143	log_fd = -2;	if (!log_console) {
144	bb_error_msg("bummer, can't write to log on %s!", log_console);	log_fd = STDERR_FILENO;
145	device = CONSOLE;	} else {
146	} else {	log_fd = device_open(log_console, O_WRONLY | O_NONBLOCK | O_NOCTTY);
147	fcntl(log_fd, F_SETFD, FD_CLOEXEC);	if (log_fd < 0) {
148		bb_error_msg("can't log to %s", log_console);
149		where = L_CONSOLE;
150		} else {
151		close_on_exec_on(log_fd);
152		}
153		}
154		}
155		if (where & L_LOG) {
156		full_write(log_fd, msg, l);
157		if (log_fd == STDERR_FILENO)
158		return; /* don't print dup messages */
159	}	}
160	}	}
	if ((device & LOG) && (log_fd >= 0)) {
	full_write(log_fd, msg, l);
	}
	#endif
161
162	if (device & CONSOLE) {	if (where & L_CONSOLE) {
163	int fd = device_open(CONSOLE_DEV,	/* Send console messages to console so people will see them. */
164	O_WRONLY | O_NOCTTY | O_NONBLOCK);	full_write(STDERR_FILENO, msg, l);
	/* Always send console messages to /dev/console so people will see them. */
	if (fd >= 0) {
	full_write(fd, msg, l);
	close(fd);
	#if ENABLE_DEBUG_INIT
	/* all descriptors may be closed */
	} else {
	bb_error_msg("bummer, can't print: ");
	va_start(arguments, fmt);
	vfprintf(stderr, fmt, arguments);
	va_end(arguments);
	#endif
	}
165	}	}
	RELEASE_CONFIG_BUFFER(msg);
166	}	}
167
168	/* Set terminal settings to reasonable defaults */	/* From <linux/serial.h> */
169	static void set_term(void)	struct serial_struct {
170		int type;
171		int line;
172		unsigned int port;
173		int irq;
174		int flags;
175		int xmit_fifo_size;
176		int custom_divisor;
177		int baud_base;
178		unsigned short close_delay;
179		char io_type;
180		char reserved_char[1];
181		int hub6;
182		unsigned short closing_wait; /* time to wait before closing */
183		unsigned short closing_wait2; /* no longer used... */
184		unsigned char *iomem_base;
185		unsigned short iomem_reg_shift;
186		unsigned int port_high;
187		unsigned long iomap_base; /* cookie passed into ioremap */
188		int reserved[1];
189		/* Paranoia (imagine 64bit kernel overwriting 32bit userspace stack) */
190		uint32_t bbox_reserved[16];
191		};
192		static void console_init(void)
193		{
194		struct serial_struct sr;
195		char *s;
196
197		s = getenv("CONSOLE");
198		if (!s)
199		s = getenv("console");
200		if (s) {
201		int fd = open(s, O_RDWR | O_NONBLOCK | O_NOCTTY);
202		if (fd >= 0) {
203		dup2(fd, STDIN_FILENO);
204		dup2(fd, STDOUT_FILENO);
205		xmove_fd(fd, STDERR_FILENO);
206		}
207		messageD(L_LOG, "console='%s'", s);
208		} else {
209		/* Make sure fd 0,1,2 are not closed
210		* (so that they won't be used by future opens) */
211		bb_sanitize_stdio();
212		// Users report problems
213		// /* Make sure init can't be blocked by writing to stderr */
214		// fcntl(STDERR_FILENO, F_SETFL, fcntl(STDERR_FILENO, F_GETFL) | O_NONBLOCK);
215		}
216
217		s = getenv("TERM");
218		if (ioctl(STDIN_FILENO, TIOCGSERIAL, &sr) == 0) {
219		/* Force the TERM setting to vt102 for serial console
220		* if TERM is set to linux (the default) */
221		if (!s || strcmp(s, "linux") == 0)
222		putenv((char*)"TERM=vt102");
223		if (!ENABLE_FEATURE_INIT_SYSLOG)
224		log_console = NULL;
225		} else if (!s)
226		putenv((char*)"TERM=linux");
227		}
228
229		/* Set terminal settings to reasonable defaults.
230		* NB: careful, we can be called after vfork! */
231		static void set_sane_term(void)
232	{	{
233	struct termios tty;	struct termios tty;
234
#	Line 261  static void set_term(void)	Line 244  static void set_term(void)
244	tty.c_cc[VSTOP] = 19; /* C-s */	tty.c_cc[VSTOP] = 19; /* C-s */
245	tty.c_cc[VSUSP] = 26; /* C-z */	tty.c_cc[VSUSP] = 26; /* C-z */
246
247	/* use line dicipline 0 */	/* use line discipline 0 */
248	tty.c_line = 0;	tty.c_line = 0;
249
250	/* Make it be sane */	/* Make it be sane */
251	tty.c_cflag &= CBAUD | CBAUDEX | CSIZE | CSTOPB | PARENB | PARODD;	tty.c_cflag &= CBAUD | CBAUDEX | CSIZE | CSTOPB | PARENB | PARODD;
252	tty.c_cflag |= CREAD | HUPCL | CLOCAL;	tty.c_cflag |= CREAD | HUPCL | CLOCAL;
253
254	/* input modes */	/* input modes */
255	tty.c_iflag = ICRNL | IXON | IXOFF;	tty.c_iflag = ICRNL | IXON | IXOFF;
256
#	Line 279  static void set_term(void)	Line 261  static void set_term(void)
261	tty.c_lflag =	tty.c_lflag =
262	ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;	ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
263
264	tcsetattr(STDIN_FILENO, TCSANOW, &tty);	tcsetattr_stdin_TCSANOW(&tty);
265	}	}
266
267	static void console_init(void)	/* Open the new terminal device.
268		* NB: careful, we can be called after vfork! */
269		static void open_stdio_to_tty(const char* tty_name, int exit_on_failure)
270		{
271		/* empty tty_name means "use init's tty", else... */
272		if (tty_name[0]) {
273		int fd;
274		close(STDIN_FILENO);
275		/* fd can be only < 0 or 0: */
276		fd = device_open(tty_name, O_RDWR);
277		if (fd) {
278		message(L_LOG | L_CONSOLE, "can't open %s: %s",
279		tty_name, strerror(errno));
280		if (exit_on_failure)
281		_exit(EXIT_FAILURE);
282		if (DEBUG_INIT)
283		_exit(2);
284		/* NB: we don't reach this if we were called after vfork.
285		* Thus halt_reboot_pwoff() itself need not be vfork-safe. */
286		halt_reboot_pwoff(SIGUSR1); /* halt the system */
287		}
288		dup2(STDIN_FILENO, STDOUT_FILENO);
289		dup2(STDIN_FILENO, STDERR_FILENO);
290		}
291		set_sane_term();
292		}
293
294		/* Wrapper around exec:
295		* Takes string (max COMMAND_SIZE chars).
296		* If chars like '>' detected, execs '[-]/bin/sh -c "exec ......."'.
297		* Otherwise splits words on whitespace, deals with leading dash,
298		* and uses plain exec().
299		* NB: careful, we can be called after vfork!
300		*/
301		static void init_exec(const char *command)
302	{	{
303	int fd;	char *cmd[COMMAND_SIZE / 2];
304	int tried = 0;	char buf[COMMAND_SIZE + 6];  /* COMMAND_SIZE+strlen("exec ")+1 */
305	struct vt_stat vt;	int dash = (command[0] == '-' /* maybe? && command[1] == '/' */);
306	struct serial_struct sr;
307	char *s;	/* See if any special /bin/sh requiring characters are present */
308		if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
309	if ((s = getenv("CONSOLE")) != NULL || (s = getenv("console")) != NULL) {	strcpy(buf, "exec ");
310	safe_strncpy(console, s, sizeof(console));	strcpy(buf + 5, command + dash); /* excluding "-" */
311	} else {	/* NB: LIBBB_DEFAULT_LOGIN_SHELL define has leading dash */
312	/* 2.2 kernels: identify the real console backend and try to use it */	cmd[0] = (char*)(LIBBB_DEFAULT_LOGIN_SHELL + !dash);
313	if (ioctl(0, TIOCGSERIAL, &sr) == 0) {	cmd[1] = (char*)"-c";
314	/* this is a serial console */	cmd[2] = buf;
315	snprintf(console, sizeof(console) - 1, SC_FORMAT, sr.line);	cmd[3] = NULL;
	} else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
	/* this is linux virtual tty */
	snprintf(console, sizeof(console) - 1, VC_FORMAT, vt.v_active);
	} else {
	safe_strncpy(console, CONSOLE_DEV, sizeof(console));
	tried++;
	}
	}
	while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0 && tried < 2) {
	/* Can't open selected console -- try
	logical system console and VT_MASTER */
	safe_strncpy(console, (tried == 0 ? CONSOLE_DEV : CURRENT_VC),
	sizeof(console));
	tried++;
	}
	if (fd < 0) {
	/* Perhaps we should panic here? */
	#if !ENABLE_SYSLOGD
	log_console =
	#endif
	safe_strncpy(console, bb_dev_null, sizeof(console));
316	} else {	} else {
317	s = getenv("TERM");	/* Convert command (char*) into cmd (char**, one word per string) */
318	/* check for serial console */	char *word, *next;
319	if (ioctl(fd, TIOCGSERIAL, &sr) == 0) {	int i = 0;
320	/* Force the TERM setting to vt102 for serial console --	next = strcpy(buf, command); /* including "-" */
321	* if TERM is set to linux (the default) */	while ((word = strsep(&next, " \t")) != NULL) {
322	if (s == NULL || strcmp(s, "linux") == 0)	if (*word != '\0') { /* not two spaces/tabs together? */
323	putenv("TERM=vt102");	cmd[i] = word;
324	#if !ENABLE_SYSLOGD	i++;
325	log_console = console;	}
	#endif
	} else {
	if (s == NULL)
	putenv("TERM=linux");
326	}	}
327	close(fd);	cmd[i] = NULL;
	}
	messageD(LOG, "console=%s", console);
	}
	static void fixup_argv(int argc, char **argv, char *new_argv0)
	{
	int len;
	/* Fix up argv[0] to be certain we claim to be init */
	len = strlen(argv[0]);
	memset(argv[0], 0, len);
	safe_strncpy(argv[0], new_argv0, len + 1);
	/* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
	len = 1;
	while (argc > len) {
	memset(argv[len], 0, strlen(argv[len]));
	len++;
	}
	}
	/* Open the new terminal device */
	static void open_new_terminal(const char * const device, const int fail) {
	struct stat sb;
	if ((device_open(device, O_RDWR)) < 0) {
	if (stat(device, &sb) != 0) {
	message(LOG | CONSOLE, "device '%s' does not exist.", device);
	} else {
	message(LOG | CONSOLE, "Bummer, can't open %s", device);
	}
	if (fail)
	_exit(1);
	/* else */
	#if !ENABLE_DEBUG_INIT
	shutdown_signal(SIGUSR1);
	#else
	_exit(2);
	#endif
328	}	}
329		/* If we saw leading "-", it is interactive shell.
330		* Try harder to give it a controlling tty.
331		* And skip "-" in actual exec call. */
332		if (dash) {
333		/* _Attempt_ to make stdin a controlling tty. */
334		if (ENABLE_FEATURE_INIT_SCTTY)
335		ioctl(STDIN_FILENO, TIOCSCTTY, 0 /*only try, don't steal*/);
336		}
337		BB_EXECVP(cmd[0] + dash, cmd);
338		message(L_LOG | L_CONSOLE, "cannot run '%s': %s", cmd[0], strerror(errno));
339		/* returns if execvp fails */
340	}	}
341
342		/* Used only by run_actions */
343	static pid_t run(const struct init_action *a)	static pid_t run(const struct init_action *a)
344	{	{
	int i;
345	pid_t pid;	pid_t pid;
	char *s, *tmpCmd, *cmd[INIT_BUFFS_SIZE], *cmdpath;
	char buf[INIT_BUFFS_SIZE + 6]; /* INIT_BUFFS_SIZE+strlen("exec ")+1 */
346	sigset_t nmask, omask;	sigset_t nmask, omask;
	static const char press_enter[] =
	#ifdef CUSTOMIZED_BANNER
	#include CUSTOMIZED_BANNER
	#endif
	"\nPlease press Enter to activate this console. ";
347
348	/* Block sigchild while forking.  */	/* Block sigchild while forking (why?) */
349	sigemptyset(&nmask);	sigemptyset(&nmask);
350	sigaddset(&nmask, SIGCHLD);	sigaddset(&nmask, SIGCHLD);
351	sigprocmask(SIG_BLOCK, &nmask, &omask);	sigprocmask(SIG_BLOCK, &nmask, &omask);
352		if (BB_MMU && (a->action_type & ASKFIRST))
353		pid = fork();
354		else
355		pid = vfork();
356		sigprocmask(SIG_SETMASK, &omask, NULL);
357
358	if ((pid = fork()) == 0) {	if (pid < 0)
359		message(L_LOG | L_CONSOLE, "can't fork");
360		if (pid)
361		return pid;
362
363		/* Child */
364
365		/* Reset signal handlers that were set by the parent process */
366		bb_signals(0
367		+ (1 << SIGUSR1)
368		+ (1 << SIGUSR2)
369		+ (1 << SIGINT)
370		+ (1 << SIGTERM)
371		+ (1 << SIGHUP)
372		+ (1 << SIGQUIT)
373		+ (1 << SIGCONT)
374		+ (1 << SIGSTOP)
375		+ (1 << SIGTSTP)
376		, SIG_DFL);
377
378	/* Clean up */	/* Create a new session and make ourself the process
379	close(0);	* group leader */
380	close(1);	setsid();
	close(2);
	sigprocmask(SIG_SETMASK, &omask, NULL);
	/* Reset signal handlers that were set by the parent process */
	signal(SIGUSR1, SIG_DFL);
	signal(SIGUSR2, SIG_DFL);
	signal(SIGINT, SIG_DFL);
	signal(SIGTERM, SIG_DFL);
	signal(SIGHUP, SIG_DFL);
	signal(SIGQUIT, SIG_DFL);
	signal(SIGCONT, SIG_DFL);
	signal(SIGSTOP, SIG_DFL);
	signal(SIGTSTP, SIG_DFL);
	/* Create a new session and make ourself the process
	* group leader */
	setsid();
	/* Open the new terminal device */
	open_new_terminal(a->terminal, 1);
	/* Make sure the terminal will act fairly normal for us */
	set_term();
	/* Setup stdout, stderr for the new process so
	* they point to the supplied terminal */
	dup(0);
	dup(0);
	/* If the init Action requires us to wait, then force the
	* supplied terminal to be the controlling tty. */
	if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
	/* Now fork off another process to just hang around */
	if ((pid = fork()) < 0) {
	message(LOG | CONSOLE, "Can't fork!");
	_exit(1);
	}
381
382	if (pid > 0) {	/* Open the new terminal device */
383		open_stdio_to_tty(a->terminal, 1 /* - exit if open fails */);
384
385	/* We are the parent -- wait till the child is done */	// NB: do not enable unless you change vfork to fork above
386	signal(SIGINT, SIG_IGN);	#ifdef BUT_RUN_ACTIONS_ALREADY_DOES_WAITING
387	signal(SIGTSTP, SIG_IGN);	/* If the init Action requires us to wait, then force the
388	signal(SIGQUIT, SIG_IGN);	* supplied terminal to be the controlling tty. */
389	signal(SIGCHLD, SIG_DFL);	if (a->action_type & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
390		/* Now fork off another process to just hang around */
391	waitfor(NULL, pid);	pid = fork();
392	/* See if stealing the controlling tty back is necessary */	if (pid < 0) {
393	if (tcgetpgrp(0) != getpid())	message(L_LOG | L_CONSOLE, "can't fork");
394	_exit(0);	_exit(EXIT_FAILURE);
395		}
396	/* Use a temporary process to steal the controlling tty. */
397	if ((pid = fork()) < 0) {	if (pid > 0) {
398	message(LOG | CONSOLE, "Can't fork!");	/* Parent - wait till the child is done */
399	_exit(1);	bb_signals(0
400	}	+ (1 << SIGINT)
401	if (pid == 0) {	+ (1 << SIGTSTP)
402	setsid();	+ (1 << SIGQUIT)
403	ioctl(0, TIOCSCTTY, 1);	, SIG_IGN);
404	_exit(0);	signal(SIGCHLD, SIG_DFL);
405	}
406	waitfor(NULL, pid);	waitfor(pid);
407	_exit(0);	/* See if stealing the controlling tty back is necessary */
408		if (tcgetpgrp(0) != getpid())
409		_exit(EXIT_SUCCESS);
410
411		/* Use a temporary process to steal the controlling tty. */
412		pid = fork();
413		if (pid < 0) {
414		message(L_LOG | L_CONSOLE, "can't fork");
415		_exit(EXIT_FAILURE);
416	}	}
417		if (pid == 0) {
418	/* Now fall though to actually execute things */	setsid();
419	}	ioctl(0, TIOCSCTTY, 1);
420		_exit(EXIT_SUCCESS);
	/* See if any special /bin/sh requiring characters are present */
	if (strpbrk(a->command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
	cmd[0] = (char *)DEFAULT_SHELL;
	cmd[1] = "-c";
	cmd[2] = strcat(strcpy(buf, "exec "), a->command);
	cmd[3] = NULL;
	} else {
	/* Convert command (char*) into cmd (char**, one word per string) */
	strcpy(buf, a->command);
	s = buf;
	for (tmpCmd = buf, i = 0; (tmpCmd = strsep(&s, " \t")) != NULL;) {
	if (*tmpCmd != '\0') {
	cmd[i] = tmpCmd;
	i++;
	}
421	}	}
422	cmd[i] = NULL;	waitfor(pid);
423		_exit(EXIT_SUCCESS);
424	}	}
425		/* Child - fall though to actually execute things */
426	cmdpath = cmd[0];	}
	/*
	Interactive shells want to see a dash in argv[0].  This
	typically is handled by login, argv will be setup this
	way if a dash appears at the front of the command path
	(like "-/bin/sh").
	*/
	if (*cmdpath == '-') {
	/* skip over the dash */
	++cmdpath;
	/* find the last component in the command pathname */
	s = bb_get_last_path_component(cmdpath);
	/* make a new argv[0] */
	if ((cmd[0] = malloc(strlen(s) + 2)) == NULL) {
	message(LOG | CONSOLE, bb_msg_memory_exhausted);
	cmd[0] = cmdpath;
	} else {
	cmd[0][0] = '-';
	strcpy(cmd[0] + 1, s);
	}
	#if ENABLE_FEATURE_INIT_SCTTY
	/* Establish this process as session leader and
	* (attempt) to make the tty (if any) a controlling tty.
	*/
	(void) setsid();
	(void) ioctl(0, TIOCSCTTY, 0/*don't steal it*/);
427	#endif	#endif
	}
428
429	#if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__)	/* NB: on NOMMU we can't wait for input in child, so
430	if (a->action & ASKFIRST) {	* "askfirst" will work the same as "respawn". */
431	char c;	if (BB_MMU && (a->action_type & ASKFIRST)) {
432	/*	static const char press_enter[] ALIGN1 =
433	* Save memory by not exec-ing anything large (like a shell)	#ifdef CUSTOMIZED_BANNER
434	* before the user wants it. This is critical if swap is not	#include CUSTOMIZED_BANNER
	* enabled and the system has low memory. Generally this will
	* be run on the second virtual console, and the first will
	* be allowed to start a shell or whatever an init script
	* specifies.
	*/
	messageD(LOG, "Waiting for enter to start '%s'"
	"(pid %d, terminal %s)\n",
	cmdpath, getpid(), a->terminal);
	full_write(1, press_enter, sizeof(press_enter) - 1);
	while (read(0, &c, 1) == 1 && c != '\n')
	;
	}
435	#endif	#endif
436		"\nPlease press Enter to activate this console. ";
437		char c;
438		/*
439		* Save memory by not exec-ing anything large (like a shell)
440		* before the user wants it. This is critical if swap is not
441		* enabled and the system has low memory. Generally this will
442		* be run on the second virtual console, and the first will
443		* be allowed to start a shell or whatever an init script
444		* specifies.
445		*/
446		messageD(L_LOG, "waiting for enter to start '%s'"
447		"(pid %d, tty '%s')\n",
448		a->command, getpid(), a->terminal);
449		full_write(STDOUT_FILENO, press_enter, sizeof(press_enter) - 1);
450		while (safe_read(STDIN_FILENO, &c, 1) == 1 && c != '\n')
451		continue;
452		}
453
454	/* Log the process name and args */	if (ENABLE_FEATURE_INIT_COREDUMPS) {
455	message(LOG, "Starting pid %d, console %s: '%s'",	struct stat sb;
456	getpid(), a->terminal, cmdpath);	if (stat(CORE_ENABLE_FLAG_FILE, &sb) == 0) {
457		struct rlimit limit;
458	#if ENABLE_FEATURE_INIT_COREDUMPS	limit.rlim_cur = RLIM_INFINITY;
459	{	limit.rlim_max = RLIM_INFINITY;
460	struct stat sb;	setrlimit(RLIMIT_CORE, &limit);
	if (stat(CORE_ENABLE_FLAG_FILE, &sb) == 0) {
	struct rlimit limit;
	limit.rlim_cur = RLIM_INFINITY;
	limit.rlim_max = RLIM_INFINITY;
	setrlimit(RLIMIT_CORE, &limit);
	}
461	}	}
	#endif
	/* Now run it.  The new program will take over this PID,
	* so nothing further in init.c should be run. */
	execv(cmdpath, cmd);
	/* We're still here?  Some error happened. */
	message(LOG | CONSOLE, "Bummer, cannot run '%s': %m", cmdpath);
	_exit(-1);
462	}	}
463	sigprocmask(SIG_SETMASK, &omask, NULL);
464	return pid;	/* Log the process name and args */
465		message(L_LOG, "starting pid %d, tty '%s': '%s'",
466		getpid(), a->terminal, a->command);
467
468		/* Now run it.  The new program will take over this PID,
469		* so nothing further in init.c should be run. */
470		init_exec(a->command);
471		/* We're still here?  Some error happened. */
472		_exit(-1);
473	}	}
474
475	static int waitfor(const struct init_action *a, pid_t pid)	static void delete_init_action(struct init_action *action)
476	{	{
477	int runpid;	struct init_action *a, *b = NULL;
	int status, wpid;
478
479	runpid = (NULL == a)? pid : run(a);	for (a = init_action_list; a; b = a, a = a->next) {
480	while (1) {	if (a == action) {
481	wpid = waitpid(runpid,&status,0);	if (b == NULL) {
482	if (wpid == runpid)	init_action_list = a->next;
483	break;	} else {
484	if (wpid == -1 && errno == ECHILD) {	b->next = a->next;
485	/* we missed its termination */	}
486		free(a);
487	break;	break;
488	}	}
	/* FIXME other errors should maybe trigger an error, but allow
	* the program to continue */
489	}	}
	return wpid;
490	}	}
491
492	/* Run all commands of a particular type */	/* Run all commands of a particular type */
493	static void run_actions(int action)	static void run_actions(int action_type)
494	{	{
495	struct init_action *a, *tmp;	struct init_action *a, *tmp;
496
497	for (a = init_action_list; a; a = tmp) {	for (a = init_action_list; a; a = tmp) {
498	tmp = a->next;	tmp = a->next;
499	if (a->action == action) {	if (a->action_type & action_type) {
500	if (access(a->terminal, R_OK | W_OK)) {	// Pointless: run() will error out if open of device fails.
501	delete_init_action(a);	///* a->terminal of "" means "init's console" */
502	} else if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {	//if (a->terminal[0] && access(a->terminal, R_OK | W_OK)) {
503	waitfor(a, 0);	// //message(L_LOG | L_CONSOLE, "Device %s cannot be opened in RW mode", a->terminal /*, strerror(errno)*/);
504		// delete_init_action(a);
505		//} else
506		if (a->action_type & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
507		waitfor(run(a));
508	delete_init_action(a);	delete_init_action(a);
509	} else if (a->action & ONCE) {	} else if (a->action_type & ONCE) {
510	run(a);	run(a);
511	delete_init_action(a);	delete_init_action(a);
512	} else if (a->action & (RESPAWN | ASKFIRST)) {	} else if (a->action_type & (RESPAWN | ASKFIRST)) {
513	/* Only run stuff with pid==0.  If they have	/* Only run stuff with pid==0.  If they have
514	* a pid, that means it is still running */	* a pid, that means it is still running */
515	if (a->pid == 0) {	if (a->pid == 0) {
#	Line 617  static void run_actions(int action)	Line 520  static void run_actions(int action)
520	}	}
521	}	}
522
	#if !ENABLE_DEBUG_INIT
523	static void init_reboot(unsigned long magic)	static void init_reboot(unsigned long magic)
524	{	{
525	pid_t pid;	pid_t pid;
526	/* We have to fork here, since the kernel calls do_exit(0) in	/* We have to fork here, since the kernel calls do_exit(EXIT_SUCCESS) in
527	* linux/kernel/sys.c, which can cause the machine to panic when	* linux/kernel/sys.c, which can cause the machine to panic when
528	* the init process is killed.... */	* the init process is killed.... */
529	pid = vfork();	pid = vfork();
530	if (pid == 0) { /* child */	if (pid == 0) { /* child */
531	reboot(magic);	reboot(magic);
532	_exit(0);	_exit(EXIT_SUCCESS);
533	}	}
534	waitpid(pid, NULL, 0);	waitfor(pid);
535	}	}
536
537	static void shutdown_system(void)	static void kill_all_processes(void)
538	{	{
	sigset_t block_signals;
539	/* run everything to be run at "shutdown".  This is done _prior_	/* run everything to be run at "shutdown".  This is done _prior_
540	* to killing everything, in case people wish to use scripts to	* to killing everything, in case people wish to use scripts to
541	* shut things down gracefully... */	* shut things down gracefully... */
542	run_actions(SHUTDOWN);	run_actions(SHUTDOWN);
543
544	/* first disable all our signals */	/* first disable all our signals */
545	sigemptyset(&block_signals);	sigprocmask_allsigs(SIG_BLOCK);
546	sigaddset(&block_signals, SIGHUP);
547	sigaddset(&block_signals, SIGQUIT);	message(L_CONSOLE | L_LOG, "The system is going down NOW!");
	sigaddset(&block_signals, SIGCHLD);
	sigaddset(&block_signals, SIGUSR1);
	sigaddset(&block_signals, SIGUSR2);
	sigaddset(&block_signals, SIGINT);
	sigaddset(&block_signals, SIGTERM);
	sigaddset(&block_signals, SIGCONT);
	sigaddset(&block_signals, SIGSTOP);
	sigaddset(&block_signals, SIGTSTP);
	sigprocmask(SIG_BLOCK, &block_signals, NULL);
548
549	/* Allow Ctrl-Alt-Del to reboot system. */	/* Allow Ctrl-Alt-Del to reboot system. */
550	init_reboot(RB_ENABLE_CAD);	init_reboot(RB_ENABLE_CAD);
551
	message(CONSOLE | LOG, "The system is going down NOW !!");
	sync();
552	/* Send signals to every process _except_ pid 1 */	/* Send signals to every process _except_ pid 1 */
553	message(CONSOLE | LOG, init_sending_format, "TERM");	message(L_CONSOLE | L_LOG, "Sending SIG%s to all processes", "TERM");
554	kill(-1, SIGTERM);	kill(-1, SIGTERM);
	sleep(1);
555	sync();	sync();
	message(CONSOLE | LOG, init_sending_format, "KILL");
	kill(-1, SIGKILL);
556	sleep(1);	sleep(1);
557
558		message(L_CONSOLE | L_LOG, "Sending SIG%s to all processes", "KILL");
559		kill(-1, SIGKILL);
560	sync();	sync();
561		sleep(1);
562	}	}
563
564	static void exec_signal(int sig ATTRIBUTE_UNUSED)	static void halt_reboot_pwoff(int sig)
	{
	struct init_action *a, *tmp;
	sigset_t unblock_signals;
	for (a = init_action_list; a; a = tmp) {
	tmp = a->next;
	if (a->action & RESTART) {
	shutdown_system();
	/* unblock all signals, blocked in shutdown_system() */
	sigemptyset(&unblock_signals);
	sigaddset(&unblock_signals, SIGHUP);
	sigaddset(&unblock_signals, SIGQUIT);
	sigaddset(&unblock_signals, SIGCHLD);
	sigaddset(&unblock_signals, SIGUSR1);
	sigaddset(&unblock_signals, SIGUSR2);
	sigaddset(&unblock_signals, SIGINT);
	sigaddset(&unblock_signals, SIGTERM);
	sigaddset(&unblock_signals, SIGCONT);
	sigaddset(&unblock_signals, SIGSTOP);
	sigaddset(&unblock_signals, SIGTSTP);
	sigprocmask(SIG_UNBLOCK, &unblock_signals, NULL);
	/* Close whatever files are open. */
	close(0);
	close(1);
	close(2);
	/* Open the new terminal device */
	open_new_terminal(a->terminal, 0);
	/* Make sure the terminal will act fairly normal for us */
	set_term();
	/* Setup stdout, stderr on the supplied terminal */
	dup(0);
	dup(0);
	messageD(CONSOLE | LOG, "Trying to re-exec %s", a->command);
	execl(a->command, a->command, NULL);
	message(CONSOLE | LOG, "exec of '%s' failed: %m",
	a->command);
	sync();
	sleep(2);
	init_reboot(RB_HALT_SYSTEM);
	loop_forever();
	}
	}
	}
	static void shutdown_signal(int sig)
565	{	{
566	char *m;	const char *m = "halt";
567	int rb;	int rb;
568
569	shutdown_system();	kill_all_processes();
570
571		rb = RB_HALT_SYSTEM;
572	if (sig == SIGTERM) {	if (sig == SIGTERM) {
573	m = "reboot";	m = "reboot";
574	rb = RB_AUTOBOOT;	rb = RB_AUTOBOOT;
575	} else if (sig == SIGUSR2) {	} else if (sig == SIGUSR2) {
576	m = "poweroff";	m = "poweroff";
577	rb = RB_POWER_OFF;	rb = RB_POWER_OFF;
	} else {
	m = "halt";
	rb = RB_HALT_SYSTEM;
578	}	}
579	message(CONSOLE | LOG, "Requesting system %s.", m);	message(L_CONSOLE | L_LOG, "Requesting system %s", m);
	sync();
580	/* allow time for last message to reach serial console */	/* allow time for last message to reach serial console */
581	sleep(2);	sleep(2);
582	init_reboot(rb);	init_reboot(rb);
583	loop_forever();	loop_forever();
584	}	}
585
586	static void ctrlaltdel_signal(int sig ATTRIBUTE_UNUSED)	/* Handler for QUIT - exec "restart" action,
587		* else (no such action defined) do nothing */
588		static void exec_restart_action(int sig UNUSED_PARAM)
589		{
590		struct init_action *a;
591
592		for (a = init_action_list; a; a = a->next) {
593		if (a->action_type & RESTART) {
594		kill_all_processes();
595
596		/* unblock all signals (blocked in kill_all_processes()) */
597		sigprocmask_allsigs(SIG_UNBLOCK);
598
599		/* Open the new terminal device */
600		open_stdio_to_tty(a->terminal, 0 /* - halt if open fails */);
601
602		messageD(L_CONSOLE | L_LOG, "Trying to re-exec %s", a->command);
603		init_exec(a->command);
604		sleep(2);
605		init_reboot(RB_HALT_SYSTEM);
606		loop_forever();
607		}
608		}
609		}
610
611		static void ctrlaltdel_signal(int sig UNUSED_PARAM)
612	{	{
613	run_actions(CTRLALTDEL);	run_actions(CTRLALTDEL);
614	}	}
615
616		/* The SIGCONT handler is set to record_signo().
617		* It just sets bb_got_signal = SIGCONT.  */
618
619	/* The SIGSTOP & SIGTSTP handler */	/* The SIGSTOP & SIGTSTP handler */
620	static void stop_handler(int sig ATTRIBUTE_UNUSED)	static void stop_handler(int sig UNUSED_PARAM)
621	{	{
622	int saved_errno = errno;	int saved_errno = errno;
623
624	got_cont = 0;	bb_got_signal = 0;
625	while (!got_cont)	while (bb_got_signal == 0)
626	pause();	pause();
	got_cont = 0;
	errno = saved_errno;
	}
627
628	/* The SIGCONT handler */	errno = saved_errno;
	static void cont_handler(int sig ATTRIBUTE_UNUSED)
	{
	got_cont = 1;
629	}	}
630
631	#endif /* ! ENABLE_DEBUG_INIT */	static void new_init_action(uint8_t action_type, const char *command, const char *cons)
	static void new_init_action(int action, const char *command, const char *cons)
632	{	{
633	struct init_action *new_action, *a, *last;	struct init_action *a, *last;
	if (*cons == '\0')
	cons = console;
	if (strcmp(cons, bb_dev_null) == 0 && (action & ASKFIRST))
	return;
634
635	new_action = xzalloc(sizeof(struct init_action));	// Why?
636		// if (strcmp(cons, bb_dev_null) == 0 && (action & ASKFIRST))
637		// return;
638
639	/* Append to the end of the list */	/* Append to the end of the list */
640	for (a = last = init_action_list; a; a = a->next) {	for (a = last = init_action_list; a; a = a->next) {
641	/* don't enter action if it's already in the list,	/* don't enter action if it's already in the list,
642	* but do overwrite existing actions */	* but do overwrite existing actions */
643	if ((strcmp(a->command, command) == 0) &&	if ((strcmp(a->command, command) == 0)
644	(strcmp(a->terminal, cons) ==0)) {	&& (strcmp(a->terminal, cons) == 0)
645	a->action = action;	) {
646	free(new_action);	a->action_type = action_type;
647	return;	return;
648	}	}
649	last = a;	last = a;
650	}	}
651
652		a = xzalloc(sizeof(*a));
653	if (last) {	if (last) {
654	last->next = new_action;	last->next = a;
655	} else {	} else {
656	init_action_list = new_action;	init_action_list = a;
	}
	strcpy(new_action->command, command);
	new_action->action = action;
	strcpy(new_action->terminal, cons);
	messageD(LOG|CONSOLE, "command='%s' action='%d' terminal='%s'\n",
	new_action->command, new_action->action, new_action->terminal);
	}
	static void delete_init_action(struct init_action *action)
	{
	struct init_action *a, *b = NULL;
	for (a = init_action_list; a; b = a, a = a->next) {
	if (a == action) {
	if (b == NULL) {
	init_action_list = a->next;
	} else {
	b->next = a->next;
	}
	free(a);
	break;
	}
657	}	}
658		a->action_type = action_type;
659		safe_strncpy(a->command, command, sizeof(a->command));
660		safe_strncpy(a->terminal, cons, sizeof(a->terminal));
661		messageD(L_LOG | L_CONSOLE, "command='%s' action=%d tty='%s'\n",
662		a->command, a->action_type, a->terminal);
663	}	}
664
665	/* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,	/* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
#	Line 840  static void delete_init_action(struct in	Line 672  static void delete_init_action(struct in
672	static void parse_inittab(void)	static void parse_inittab(void)
673	{	{
674	#if ENABLE_FEATURE_USE_INITTAB	#if ENABLE_FEATURE_USE_INITTAB
675	FILE *file;	char *token[4];
676	char buf[INIT_BUFFS_SIZE], lineAsRead[INIT_BUFFS_SIZE];	parser_t *parser = config_open2("/etc/inittab", fopen_for_read);
	char tmpConsole[CONSOLE_BUFF_SIZE];
	char *id, *runlev, *action, *command, *eol;
	const struct init_action_type *a = actions;
677
678		if (parser == NULL)
	file = fopen(INITTAB, "r");
	if (file == NULL) {
	/* No inittab file -- set up some default behavior */
679	#endif	#endif
680		{
681		/* No inittab file -- set up some default behavior */
682	/* Reboot on Ctrl-Alt-Del */	/* Reboot on Ctrl-Alt-Del */
683	new_init_action(CTRLALTDEL, "/sbin/reboot", "");	new_init_action(CTRLALTDEL, "reboot", "");
684	/* Umount all filesystems on halt/reboot */	/* Umount all filesystems on halt/reboot */
685	new_init_action(SHUTDOWN, "/bin/umount -a -r", "");	new_init_action(SHUTDOWN, "umount -a -r", "");
686	/* Swapoff on halt/reboot */	/* Swapoff on halt/reboot */
687	if(ENABLE_SWAPONOFF) new_init_action(SHUTDOWN, "/sbin/swapoff -a", "");	if (ENABLE_SWAPONOFF)
688	/* Prepare to restart init when a HUP is received */	new_init_action(SHUTDOWN, "swapoff -a", "");
689	new_init_action(RESTART, "/sbin/init", "");	/* Prepare to restart init when a QUIT is received */
690		new_init_action(RESTART, "init", "");
691	/* Askfirst shell on tty1-4 */	/* Askfirst shell on tty1-4 */
692	new_init_action(ASKFIRST, bb_default_login_shell, "");	new_init_action(ASKFIRST, bb_default_login_shell, "");
693		//TODO: VC_1 instead of ""? "" is console -> ctty problems -> angry users
694	new_init_action(ASKFIRST, bb_default_login_shell, VC_2);	new_init_action(ASKFIRST, bb_default_login_shell, VC_2);
695	new_init_action(ASKFIRST, bb_default_login_shell, VC_3);	new_init_action(ASKFIRST, bb_default_login_shell, VC_3);
696	new_init_action(ASKFIRST, bb_default_login_shell, VC_4);	new_init_action(ASKFIRST, bb_default_login_shell, VC_4);
697	/* sysinit */	/* sysinit */
698	new_init_action(SYSINIT, INIT_SCRIPT, "");	new_init_action(SYSINIT, INIT_SCRIPT, "");
699	return;	return;
	#if ENABLE_FEATURE_USE_INITTAB
700	}	}
701
702	while (fgets(buf, INIT_BUFFS_SIZE, file) != NULL) {	#if ENABLE_FEATURE_USE_INITTAB
703	/* Skip leading spaces */	/* optional_tty:ignored_runlevel:action:command
704	for (id = buf; *id == ' ' || *id == '\t'; id++);	* Delims are not to be collapsed and need exactly 4 tokens
705		*/
706	/* Skip the line if it's a comment */	while (config_read(parser, token, 4, 0, "#:",
707	if (*id == '#' || *id == '\n')	PARSE_NORMAL & ~(PARSE_TRIM | PARSE_COLLAPSE))) {
708	continue;	/* order must correspond to SYSINIT..RESTART constants */
709		static const char actions[] ALIGN1 =
710	/* Trim the trailing \n */	"sysinit\0""respawn\0""askfirst\0""wait\0""once\0"
711	eol = strrchr(id, '\n');	"ctrlaltdel\0""shutdown\0""restart\0";
712	if (eol != NULL)	int action;
713	*eol = '\0';	char *tty = token[0];
714
715	/* Keep a copy around for posterity's sake (and error msgs) */	if (!token[3]) /* less than 4 tokens */
716	strcpy(lineAsRead, buf);	goto bad_entry;
717		action = index_in_strings(actions, token[2]);
718	/* Separate the ID field from the runlevels */	if (action < 0 || !token[3][0]) /* token[3]: command */
719	runlev = strchr(id, ':');	goto bad_entry;
720	if (runlev == NULL || *(runlev + 1) == '\0') {	/* turn .*TTY -> /dev/TTY */
721	message(LOG | CONSOLE, "Bad inittab entry: %s", lineAsRead);	if (tty[0]) {
722	continue;	if (strncmp(tty, "/dev/", 5) == 0)
723	} else {	tty += 5;
724	*runlev = '\0';	tty = concat_path_file("/dev/", tty);
725	++runlev;	}
726	}	new_init_action(1 << action, token[3], tty);
727		if (tty[0])
728	/* Separate the runlevels from the action */	free(tty);
729	action = strchr(runlev, ':');	continue;
730	if (action == NULL || *(action + 1) == '\0') {	bad_entry:
731	message(LOG | CONSOLE, "Bad inittab entry: %s", lineAsRead);	message(L_LOG | L_CONSOLE, "Bad inittab entry at line %d",
732	continue;	parser->lineno);
	} else {
	*action = '\0';
	++action;
	}
	/* Separate the action from the command */
	command = strchr(action, ':');
	if (command == NULL || *(command + 1) == '\0') {
	message(LOG | CONSOLE, "Bad inittab entry: %s", lineAsRead);
	continue;
	} else {
	*command = '\0';
	++command;
	}
	/* Ok, now process it */
	for (a = actions; a->name != 0; a++) {
	if (strcmp(a->name, action) == 0) {
	if (*id != '\0') {
	if(strncmp(id, "/dev/", 5) == 0)
	id += 5;
	strcpy(tmpConsole, "/dev/");
	safe_strncpy(tmpConsole + 5, id,
	CONSOLE_BUFF_SIZE - 5);
	id = tmpConsole;
	}
	new_init_action(a->action, command, id);
	break;
	}
	}
	if (a->name == 0) {
	/* Choke on an unknown action */
	message(LOG | CONSOLE, "Bad inittab entry: %s", lineAsRead);
	}
733	}	}
734	fclose(file);	config_close(parser);
735	return;	#endif
	#endif /* FEATURE_USE_INITTAB */
736	}	}
737
738	#if ENABLE_FEATURE_USE_INITTAB	#if ENABLE_FEATURE_USE_INITTAB
739	static void reload_signal(int sig ATTRIBUTE_UNUSED)	static void reload_signal(int sig UNUSED_PARAM)
740	{	{
741	struct init_action *a, *tmp;	struct init_action *a, *tmp;
742
743	message(LOG, "Reloading /etc/inittab");	message(L_LOG, "reloading /etc/inittab");
744
745	/* disable old entrys */	/* disable old entrys */
746	for (a = init_action_list; a; a = a->next ) {	for (a = init_action_list; a; a = a->next) {
747	a->action = ONCE;	a->action_type = ONCE;
748	}	}
749
750	parse_inittab();	parse_inittab();
751
752		if (ENABLE_FEATURE_KILL_REMOVED) {
753		/* Be nice and send SIGTERM first */
754		for (a = init_action_list; a; a = a->next) {
755		pid_t pid = a->pid;
756		if ((a->action_type & ONCE) && pid != 0) {
757		kill(pid, SIGTERM);
758		}
759		}
760		#if CONFIG_FEATURE_KILL_DELAY
761		/* NB: parent will wait in NOMMU case */
762		if ((BB_MMU ? fork() : vfork()) == 0) { /* child */
763		sleep(CONFIG_FEATURE_KILL_DELAY);
764		for (a = init_action_list; a; a = a->next) {
765		pid_t pid = a->pid;
766		if ((a->action_type & ONCE) && pid != 0) {
767		kill(pid, SIGKILL);
768		}
769		}
770		_exit(EXIT_SUCCESS);
771		}
772		#endif
773		}
774
775	/* remove unused entrys */	/* remove unused entrys */
776	for (a = init_action_list; a; a = tmp) {	for (a = init_action_list; a; a = tmp) {
777	tmp = a->next;	tmp = a->next;
778	if (a->action & (ONCE | SYSINIT | WAIT ) &&	if ((a->action_type & (ONCE | SYSINIT | WAIT)) && a->pid == 0) {
	a->pid == 0 ) {
779	delete_init_action(a);	delete_init_action(a);
780	}	}
781	}	}
782	run_actions(RESPAWN);	run_actions(RESPAWN | ASKFIRST);
	return;
783	}	}
784	#endif  /* FEATURE_USE_INITTAB */	#endif
785
786	int init_main(int argc, char **argv)	int init_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
787		int init_main(int argc UNUSED_PARAM, char **argv)
788	{	{
789	struct init_action *a;	struct init_action *a;
790	pid_t wpid;	pid_t wpid;
791
792	die_sleep = 30 * 24*60*60; /* if xmalloc will ever die... */	die_sleep = 30 * 24*60*60; /* if xmalloc will ever die... */
793
794	if (argc > 1 && !strcmp(argv[1], "-q")) {	if (argv[1] && !strcmp(argv[1], "-q")) {
795	return kill(1,SIGHUP);	return kill(1, SIGHUP);
796	}	}
797	#if !ENABLE_DEBUG_INIT
798	/* Expect to be invoked as init with PID=1 or be invoked as linuxrc */	if (!DEBUG_INIT) {
799	if (getpid() != 1 &&	/* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
800	(!ENABLE_FEATURE_INITRD || !strstr(applet_name, "linuxrc")))	if (getpid() != 1
801	{	&& (!ENABLE_FEATURE_INITRD || !strstr(applet_name, "linuxrc"))
802	bb_show_usage();	) {
803		bb_show_usage();
804		}
805		/* Set up sig handlers  -- be sure to
806		* clear all of these in run() */
807		signal(SIGQUIT, exec_restart_action);
808		bb_signals(0
809		+ (1 << SIGUSR1)  /* halt */
810		+ (1 << SIGUSR2)  /* poweroff */
811		+ (1 << SIGTERM)  /* reboot */
812		, halt_reboot_pwoff);
813		signal(SIGINT, ctrlaltdel_signal);
814		signal(SIGCONT, record_signo);
815		bb_signals(0
816		+ (1 << SIGSTOP)
817		+ (1 << SIGTSTP)
818		, stop_handler);
819
820		/* Turn off rebooting via CTL-ALT-DEL -- we get a
821		* SIGINT on CAD so we can shut things down gracefully... */
822		init_reboot(RB_DISABLE_CAD);
823	}	}
	/* Set up sig handlers  -- be sure to
	* clear all of these in run() */
	signal(SIGHUP, exec_signal);
	signal(SIGQUIT, exec_signal);
	signal(SIGUSR1, shutdown_signal);
	signal(SIGUSR2, shutdown_signal);
	signal(SIGINT, ctrlaltdel_signal);
	signal(SIGTERM, shutdown_signal);
	signal(SIGCONT, cont_handler);
	signal(SIGSTOP, stop_handler);
	signal(SIGTSTP, stop_handler);
	/* Turn off rebooting via CTL-ALT-DEL -- we get a
	* SIGINT on CAD so we can shut things down gracefully... */
	init_reboot(RB_DISABLE_CAD);
	#endif
824
825	/* Figure out where the default console should be */	/* Figure out where the default console should be */
826	console_init();	console_init();
827		set_sane_term();
828	/* Close whatever files are open, and reset the console. */	xchdir("/");
	close(0);
	close(1);
	close(2);
	if (device_open(console, O_RDWR | O_NOCTTY) == 0) {
	set_term();
	close(0);
	}
	chdir("/");
829	setsid();	setsid();
	{
	const char * const *e;
	/* Make sure environs is set to something sane */
	for (e = environment; *e; e++)
	putenv((char *) *e);
	}
830
831	if (argc > 1) setenv("RUNLEVEL", argv[1], 1);	/* Make sure environs is set to something sane */
832		putenv((char *) "HOME=/");
833		putenv((char *) bb_PATH_root_path);
834		putenv((char *) "SHELL=/bin/sh");
835		putenv((char *) "USER=root"); /* needed? why? */
836
837		if (argv[1])
838		xsetenv("RUNLEVEL", argv[1]);
839
840	/* Hello world */	/* Hello world */
841	message(MAYBE_CONSOLE | LOG, "init started:  %s", bb_msg_full_version);	message(MAYBE_CONSOLE | L_LOG, "init started: %s", bb_banner);
842
843	/* Make sure there is enough memory to do something useful. */	/* Make sure there is enough memory to do something useful. */
844	if (ENABLE_SWAPONOFF) {	if (ENABLE_SWAPONOFF) {
#	Line 1037  int init_main(int argc, char **argv)	Line 847  int init_main(int argc, char **argv)
847	if (!sysinfo(&info) &&	if (!sysinfo(&info) &&
848	(info.mem_unit ? : 1) * (long long)info.totalram < 1024*1024)	(info.mem_unit ? : 1) * (long long)info.totalram < 1024*1024)
849	{	{
850	message(CONSOLE,"Low memory: forcing swapon.");	message(L_CONSOLE, "Low memory, forcing swapon");
851	/* swapon -a requires /proc typically */	/* swapon -a requires /proc typically */
852	new_init_action(SYSINIT, "/bin/mount -t proc proc /proc", "");	new_init_action(SYSINIT, "mount -t proc proc /proc", "");
853	/* Try to turn on swap */	/* Try to turn on swap */
854	new_init_action(SYSINIT, "/sbin/swapon -a", "");	new_init_action(SYSINIT, "swapon -a", "");
855	run_actions(SYSINIT);   /* wait and removing */	run_actions(SYSINIT);   /* wait and removing */
856	}	}
857	}	}
858
859	/* Check if we are supposed to be in single user mode */	/* Check if we are supposed to be in single user mode */
860	if (argc > 1	if (argv[1]
861	&& (!strcmp(argv[1], "single") || !strcmp(argv[1], "-s") || LONE_CHAR(argv[1], '1'))	&& (!strcmp(argv[1], "single") || !strcmp(argv[1], "-s") || LONE_CHAR(argv[1], '1'))
862	) {	) {
863		/* ??? shouldn't we set RUNLEVEL="b" here? */
864	/* Start a shell on console */	/* Start a shell on console */
865	new_init_action(RESPAWN, bb_default_login_shell, "");	new_init_action(RESPAWN, bb_default_login_shell, "");
866	} else {	} else {
#	Line 1066  int init_main(int argc, char **argv)	Line 877  int init_main(int argc, char **argv)
877	if (getenv("SELINUX_INIT") == NULL) {	if (getenv("SELINUX_INIT") == NULL) {
878	int enforce = 0;	int enforce = 0;
879
880	putenv("SELINUX_INIT=YES");	putenv((char*)"SELINUX_INIT=YES");
881	if (selinux_init_load_policy(&enforce) == 0) {	if (selinux_init_load_policy(&enforce) == 0) {
882	execv(argv[0], argv);	BB_EXECVP(argv[0], argv);
883	} else if (enforce > 0) {	} else if (enforce > 0) {
884	/* SELinux in enforcing mode but load_policy failed */	/* SELinux in enforcing mode but load_policy failed */
885	/* At this point, we probably can't open /dev/console, so log() won't work */	message(L_CONSOLE, "cannot load SELinux Policy. "
886	message(CONSOLE,"Unable to load SELinux Policy. Machine is in enforcing mode. Halting now.");	"Machine is in enforcing mode. Halting now.");
887	exit(1);	exit(EXIT_FAILURE);
888	}	}
889	}	}
890	#endif /* CONFIG_SELINUX */	#endif /* CONFIG_SELINUX */
891
892	/* Make the command line just say "init"  -- thats all, nothing else */	/* Make the command line just say "init"  - thats all, nothing else */
893	fixup_argv(argc, argv, "init");	strncpy(argv[0], "init", strlen(argv[0]));
894		/* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
895		while (*++argv)
896		memset(*argv, 0, strlen(*argv));
897
898	/* Now run everything that needs to be run */	/* Now run everything that needs to be run */
899
#	Line 1092  int init_main(int argc, char **argv)	Line 906  int init_main(int argc, char **argv)
906	/* Next run anything to be run only once */	/* Next run anything to be run only once */
907	run_actions(ONCE);	run_actions(ONCE);
908
	#if ENABLE_FEATURE_USE_INITTAB
909	/* Redefine SIGHUP to reread /etc/inittab */	/* Redefine SIGHUP to reread /etc/inittab */
910		#if ENABLE_FEATURE_USE_INITTAB
911	signal(SIGHUP, reload_signal);	signal(SIGHUP, reload_signal);
912	#else	#else
913	signal(SIGHUP, SIG_IGN);	signal(SIGHUP, SIG_IGN);
914	#endif /* FEATURE_USE_INITTAB */	#endif
915
916	/* Now run the looping stuff for the rest of forever */	/* Now run the looping stuff for the rest of forever */
917	while (1) {	while (1) {
918	/* run the respawn stuff */	/* run the respawn/askfirst stuff */
919	run_actions(RESPAWN);	run_actions(RESPAWN | ASKFIRST);
	/* run the askfirst stuff */
	run_actions(ASKFIRST);
920
921	/* Don't consume all CPU time -- sleep a bit */	/* Don't consume all CPU time -- sleep a bit */
922	sleep(1);	sleep(1);
923
924	/* Wait for a child process to exit */	/* Wait for any child process to exit */
925	wpid = wait(NULL);	wpid = wait(NULL);
926	while (wpid > 0) {	while (wpid > 0) {
927	/* Find out who died and clean up their corpse */	/* Find out who died and clean up their corpse */
#	Line 1120  int init_main(int argc, char **argv)	Line 930  int init_main(int argc, char **argv)
930	/* Set the pid to 0 so that the process gets	/* Set the pid to 0 so that the process gets
931	* restarted by run_actions() */	* restarted by run_actions() */
932	a->pid = 0;	a->pid = 0;
933	message(LOG, "Process '%s' (pid %d) exited.  "	message(L_LOG, "process '%s' (pid %d) exited. "
934	"Scheduling it for restart.",	"Scheduling for restart.",
935	a->command, wpid);	a->command, wpid);
936	}	}
937	}	}
938	/* see if anyone else is waiting to be reaped */	/* see if anyone else is waiting to be reaped */
939	wpid = waitpid(-1, NULL, WNOHANG);	wpid = wait_any_nohang(NULL);
940	}	}
941	}	}
942	}	}

---

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Legend: Removed from v.815   changed lines   Added in v.816