Diff of /trunk/mkinitrd-magellan/busybox/util-linux/mdev.c

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	revision 983 by niro, Fri Apr 24 18:33:46 2009 UTC	revision 984 by niro, Sun May 30 11:32:42 2010 UTC
#	Line 1	Line 1
1	/* vi: set sw=4 ts=4: */	/* vi: set sw=4 ts=4: */
2	/*	/*
	*
3	* mdev - Mini udev for busybox	* mdev - Mini udev for busybox
4	*	*
5	* Copyright 2005 Rob Landley <rob@landley.net>	* Copyright 2005 Rob Landley <rob@landley.net>
#	Line 8	Line 7
7	*	*
8	* Licensed under GPL version 2, see file LICENSE in this tarball for details.	* Licensed under GPL version 2, see file LICENSE in this tarball for details.
9	*/	*/
10	#include "libbb.h"	#include "libbb.h"
11	#include "xregex.h"	#include "xregex.h"
12
13		/* "mdev -s" scans /sys/class/xxx, looking for directories which have dev
14		* file (it is of the form "M:m\n"). Example: /sys/class/tty/tty0/dev
15		* contains "4:0\n". Directory name is taken as device name, path component
16		* directly after /sys/class/ as subsystem. In this example, "tty0" and "tty".
17		* Then mdev creates the /dev/device_name node.
18		* If /sys/class/.../dev file does not exist, mdev still may act
19		* on this device: see "@|$|*command args..." parameter in config file.
20		*
21		* mdev w/o parameters is called as hotplug helper. It takes device
22		* and subsystem names from $DEVPATH and $SUBSYSTEM, extracts
23		* maj,min from "/sys/$DEVPATH/dev" and also examines
24		* $ACTION ("add"/"delete") and $FIRMWARE.
25		*
26		* If action is "add", mdev creates /dev/device_name similarly to mdev -s.
27		* (todo: explain "delete" and $FIRMWARE)
28		*
29		* If /etc/mdev.conf exists, it may modify /dev/device_name's properties.
30		* /etc/mdev.conf file format:
31		*
32		* [-][subsystem/]device  user:grp  mode  [>|=path] [@|$|*command args...]
33		* [-]@maj,min[-min2]     user:grp  mode  [>|=path] [@|$|*command args...]
34		* [-]$envvar=val         user:grp  mode  [>|=path] [@|$|*command args...]
35		*
36		* Leading minus in 1st field means "don't stop on this line", otherwise
37		* search is stopped after the matching line is encountered.
38		*
39		* The device name or "subsystem/device" combo is matched against 1st field
40		* (which is a regex), or maj,min is matched against 1st field,
41		* or specified environment variable (as regex) is matched against 1st field.
42		*
43		* $envvar=val format is useful for loading modules for hot-plugged devices
44		* which do not have driver loaded yet. In this case /sys/class/.../dev
45		* does not exist, but $MODALIAS is set to needed module's name
46		* (actually, an alias to it) by kernel. This rule instructs mdev
47		* to load the module and exit:
48		*    $MODALIAS=.* 0:0 660 @modprobe "$MODALIAS"
49		* The kernel will generate another hotplug event when /sys/class/.../dev
50		* file appears.
51		*
52		* When line matches, the device node is created, chmod'ed and chown'ed,
53		* moved to path, and if >path, a symlink to moved node is created,
54		* all this if /sys/class/.../dev exists.
55		*    Examples:
56		*    =loop/      - moves to /dev/loop
57		*    >disk/sda%1 - moves to /dev/disk/sdaN, makes /dev/sdaN a symlink
58		*
59		* Then "command args..." is executed (via sh -c 'command args...').
60		* @:execute on creation, $:on deletion, *:on both.
61		* This happens regardless of /sys/class/.../dev existence.
62		*/
63
64	struct globals {	struct globals {
65	int root_major, root_minor;	int root_major, root_minor;
66		char *subsystem;
67	};	};
68	#define G (*(struct globals*)&bb_common_bufsiz1)	#define G (*(struct globals*)&bb_common_bufsiz1)
69	#define root_major (G.root_major)	#define root_major (G.root_major)
70	#define root_minor (G.root_minor)	#define root_minor (G.root_minor)
71		#define subsystem  (G.subsystem )
72
73	/* Prevent infinite loops in /sys symlinks */	/* Prevent infinite loops in /sys symlinks */
74	#define MAX_SYSFS_DEPTH 3	#define MAX_SYSFS_DEPTH 3
#	Line 25  struct globals {	Line 76  struct globals {
76	/* We use additional 64+ bytes in make_device() */	/* We use additional 64+ bytes in make_device() */
77	#define SCRATCH_SIZE 80	#define SCRATCH_SIZE 80
78
	#if ENABLE_FEATURE_MDEV_RENAME
79	/* Builds an alias path.	/* Builds an alias path.
80	* This function potentionally reallocates the alias parameter.	* This function potentionally reallocates the alias parameter.
81		* Only used for ENABLE_FEATURE_MDEV_RENAME
82	*/	*/
83	static char *build_alias(char *alias, const char *device_name)	static char *build_alias(char *alias, const char *device_name)
84	{	{
#	Line 49  static char *build_alias(char *alias, co	Line 100  static char *build_alias(char *alias, co
100
101	return alias;	return alias;
102	}	}
	#endif
103
104	/* mknod in /dev based on a path like "/sys/block/hda/hda1" */	/* mknod in /dev based on a path like "/sys/block/hda/hda1"
105	/* NB: "mdev -s" may call us many times, do not leak memory/fds! */	* NB1: path parameter needs to have SCRATCH_SIZE scratch bytes
106		* after NUL, but we promise to not mangle (IOW: to restore if needed)
107		* path string.
108		* NB2: "mdev -s" may call us many times, do not leak memory/fds!
109		*/
110	static void make_device(char *path, int delete)	static void make_device(char *path, int delete)
111	{	{
112	const char *device_name;	char *device_name;
113	int major, minor, type, len;	int major, minor, type, len;
114	int mode = 0660;	mode_t mode;
	#if ENABLE_FEATURE_MDEV_CONF
	struct bb_uidgid_t ugid = { 0, 0 };
115	parser_t *parser;	parser_t *parser;
	char *tokens[5];
	#endif
	#if ENABLE_FEATURE_MDEV_EXEC
	char *command = NULL;
	#endif
	#if ENABLE_FEATURE_MDEV_RENAME
	char *alias = NULL;
	char aliaslink = aliaslink; /* for compiler */
	#endif
	char *dev_maj_min = path + strlen(path);
	/* Force the configuration file settings exactly. */
	umask(0);
116
117	/* Try to read major/minor string.  Note that the kernel puts \n after	/* Try to read major/minor string.  Note that the kernel puts \n after
118	* the data, so we don't need to worry about null terminating the string	* the data, so we don't need to worry about null terminating the string
#	Line 82  static void make_device(char *path, int	Line 121  static void make_device(char *path, int
121	*/	*/
122	major = -1;	major = -1;
123	if (!delete) {	if (!delete) {
124		char *dev_maj_min = path + strlen(path);
125
126	strcpy(dev_maj_min, "/dev");	strcpy(dev_maj_min, "/dev");
127	len = open_read_close(path, dev_maj_min + 1, 64);	len = open_read_close(path, dev_maj_min + 1, 64);
128	*dev_maj_min++ = '\0';	*dev_maj_min = '\0';
129	if (len < 1) {	if (len < 1) {
130	if (!ENABLE_FEATURE_MDEV_EXEC)	if (!ENABLE_FEATURE_MDEV_EXEC)
131	return;	return;
132	/* no "dev" file, so just try to run script */	/* no "dev" file, but we can still run scripts
133	*dev_maj_min = '\0';	* based on device name */
134	} else if (sscanf(dev_maj_min, "%u:%u", &major, &minor) != 2) {	} else if (sscanf(++dev_maj_min, "%u:%u", &major, &minor) != 2) {
135	major = -1;	major = -1;
136	}	}
137	}	}
138
139	/* Determine device name, type, major and minor */	/* Determine device name, type, major and minor */
140	device_name = bb_basename(path);	device_name = (char*) bb_basename(path);
141	/* http://kernel.org/doc/pending/hotplug.txt says that only	/* http://kernel.org/doc/pending/hotplug.txt says that only
142	* "/sys/block/..." is for block devices. "/sys/bus" etc is not.	* "/sys/block/..." is for block devices. "/sys/bus" etc is not.
143	* But since 2.6.25 block devices are also in /sys/class/block.	* But since 2.6.25 block devices are also in /sys/class/block,
144	* We use strstr("/block/") to forestall future surprises. */	* we use strstr("/block/") to forestall future surprises. */
145	type = S_IFCHR;	type = S_IFCHR;
146	if (strstr(path, "/block/"))	if (strstr(path, "/block/"))
147	type = S_IFBLK;	type = S_IFBLK;
148
149	#if ENABLE_FEATURE_MDEV_CONF	/* Make path point to "subsystem/device_name" */
150	parser = config_open2("/etc/mdev.conf", fopen_for_read);	if (path[5] == 'b') /* legacy /sys/block? */
151		path += sizeof("/sys/") - 1;
152		else
153		path += sizeof("/sys/class/") - 1;
154
155	/* If we have config file, look up user settings */	/* If we have config file, look up user settings */
156	while (config_read(parser, tokens, 4, 3, "# \t", PARSE_NORMAL)) {	if (ENABLE_FEATURE_MDEV_CONF)
157	regmatch_t off[1 + 9*ENABLE_FEATURE_MDEV_RENAME_REGEXP];	parser = config_open2("/etc/mdev.conf", fopen_for_read);
158	char *val;
159		do {
160	/* Fields: regex uid:gid mode [alias] [cmd] */	int keep_matching;
161		struct bb_uidgid_t ugid;
162	/* 1st field: @<numeric maj,min>... */	char *tokens[4];
163	if (tokens[0][0] == '@') {	char *command = NULL;
164	/* @major,minor[-last] */	char *alias = NULL;
165	/* (useful when name is ambiguous:	char aliaslink = aliaslink; /* for compiler */
166	* "/sys/class/usb/lp0" and
167	* "/sys/class/printer/lp0") */	/* Defaults in case we won't match any line */
168	int cmaj, cmin0, cmin1, sc;	ugid.uid = ugid.gid = 0;
169	if (major < 0)	keep_matching = 0;
170	continue; /* no dev, no match */	mode = 0660;
171	sc = sscanf(tokens[0], "@%u,%u-%u", &cmaj, &cmin0, &cmin1);
172	if (sc < 1 || major != cmaj	if (ENABLE_FEATURE_MDEV_CONF
173	|| (sc == 2 && minor != cmin0)	&& config_read(parser, tokens, 4, 3, "# \t", PARSE_NORMAL)
174	|| (sc == 3 && (minor < cmin0 || minor > cmin1))	) {
175	) {	char *val;
176	continue; /* no match */	char *str_to_match;
177		regmatch_t off[1 + 9 * ENABLE_FEATURE_MDEV_RENAME_REGEXP];
178
179		val = tokens[0];
180		keep_matching = ('-' == val[0]);
181		val += keep_matching; /* swallow leading dash */
182
183		/* Match against either "subsystem/device_name"
184		* or "device_name" alone */
185		str_to_match = strchr(val, '/') ? path : device_name;
186
187		/* Fields: regex uid:gid mode [alias] [cmd] */
188
189		if (val[0] == '@') {
190		/* @major,minor[-minor2] */
191		/* (useful when name is ambiguous:
192		* "/sys/class/usb/lp0" and
193		* "/sys/class/printer/lp0") */
194		int cmaj, cmin0, cmin1, sc;
195		if (major < 0)
196		continue; /* no dev, no match */
197		sc = sscanf(val, "@%u,%u-%u", &cmaj, &cmin0, &cmin1);
198		if (sc < 1 || major != cmaj
199		|| (sc == 2 && minor != cmin0)
200		|| (sc == 3 && (minor < cmin0 || minor > cmin1))
201		) {
202		continue; /* this line doesn't match */
203		}
204		goto line_matches;
205	}	}
206	} else { /* ... or regex to match device name */	if (val[0] == '$') {
207	regex_t match;	/* regex to match an environment variable */
208	int result;	char *eq = strchr(++val, '=');
209		if (!eq)
210	/* Is this it? */	continue;
211	xregcomp(&match, tokens[0], REG_EXTENDED);	*eq = '\0';
212	result = regexec(&match, device_name, ARRAY_SIZE(off), off, 0);	str_to_match = getenv(val);
213	regfree(&match);	if (!str_to_match)
214		continue;
215	//bb_error_msg("matches:");	str_to_match -= strlen(val) + 1;
216	//for (int i = 0; i < ARRAY_SIZE(off); i++) {	*eq = '=';
	// if (off[i].rm_so < 0) continue;
	// bb_error_msg("match %d: '%.*s'\n", i,
	// (int)(off[i].rm_eo - off[i].rm_so),
	// device_name + off[i].rm_so);
	//}
	/* If not this device, skip rest of line */
	/* (regexec returns whole pattern as "range" 0) */
	if (result || off[0].rm_so
	|| ((int)off[0].rm_eo != (int)strlen(device_name))
	) {
	continue;
217	}	}
218	}	/* else: regex to match [subsystem/]device_name */
	/* This line matches: stop parsing the file
	* after parsing the rest of fields */
	/* 2nd field: uid:gid - device ownership */
	parse_chown_usergroup_or_die(&ugid, tokens[1]);
	/* 3rd field: mode - device permissions */
	mode = strtoul(tokens[2], NULL, 8);
219
220	val = tokens[3];	{
221	/* 4th field (opt): >alias */	regex_t match;
222	#if ENABLE_FEATURE_MDEV_RENAME	int result;
223	if (!val)
224	break;	xregcomp(&match, val, REG_EXTENDED);
225	aliaslink = *val;	result = regexec(&match, str_to_match, ARRAY_SIZE(off), off, 0);
226	if (aliaslink == '>' || aliaslink == '=') {	regfree(&match);
227	char *s;	//bb_error_msg("matches:");
228	#if ENABLE_FEATURE_MDEV_RENAME_REGEXP	//for (int i = 0; i < ARRAY_SIZE(off); i++) {
229	char *p;	// if (off[i].rm_so < 0) continue;
230	unsigned i, n;	// bb_error_msg("match %d: '%.*s'\n", i,
231	#endif	// (int)(off[i].rm_eo - off[i].rm_so),
232	char *a = val;	// device_name + off[i].rm_so);
233	s = strchrnul(val, ' ');	//}
234	val = (s[0] && s[1]) ? s+1 : NULL;
235	s[0] = '\0';	/* If no match, skip rest of line */
236	#if ENABLE_FEATURE_MDEV_RENAME_REGEXP	/* (regexec returns whole pattern as "range" 0) */
237	/* substitute %1..9 with off[1..9], if any */	if (result || off[0].rm_so
238	n = 0;	|| ((int)off[0].rm_eo != (int)strlen(str_to_match))
239	s = a;	) {
240	while (*s)	continue; /* this line doesn't match */
241	if (*s++ == '%')	}
242	n++;	}
243		line_matches:
244	p = alias = xzalloc(strlen(a) + n * strlen(device_name));	/* This line matches. Stop parsing after parsing
245	s = a + 1;	* the rest the line unless keep_matching == 1 */
246	while (*s) {
247	*p = *s;	/* 2nd field: uid:gid - device ownership */
248	if ('%' == *s) {	if (get_uidgid(&ugid, tokens[1], 1) == 0)
249	i = (s[1] - '0');	bb_error_msg("unknown user/group %s on line %d", tokens[1], parser->lineno);
250	if (i <= 9 && off[i].rm_so >= 0) {
251	n = off[i].rm_eo - off[i].rm_so;	/* 3rd field: mode - device permissions */
252	strncpy(p, device_name + off[i].rm_so, n);	/* mode = strtoul(tokens[2], NULL, 8); */
253	p += n - 1;	bb_parse_mode(tokens[2], &mode);
254	s++;
255		val = tokens[3];
256		/* 4th field (opt): >|=alias */
257
258		if (ENABLE_FEATURE_MDEV_RENAME && val) {
259		aliaslink = val[0];
260		if (aliaslink == '>' || aliaslink == '=') {
261		char *a, *s, *st;
262		char *p;
263		unsigned i, n;
264
265		a = val;
266		s = strchrnul(val, ' ');
267		st = strchrnul(val, '\t');
268		if (st < s)
269		s = st;
270		val = (s[0] && s[1]) ? s+1 : NULL;
271		s[0] = '\0';
272
273		if (ENABLE_FEATURE_MDEV_RENAME_REGEXP) {
274		/* substitute %1..9 with off[1..9], if any */
275		n = 0;
276		s = a;
277		while (*s)
278		if (*s++ == '%')
279		n++;
280
281		p = alias = xzalloc(strlen(a) + n * strlen(str_to_match));
282		s = a + 1;
283		while (*s) {
284		*p = *s;
285		if ('%' == *s) {
286		i = (s[1] - '0');
287		if (i <= 9 && off[i].rm_so >= 0) {
288		n = off[i].rm_eo - off[i].rm_so;
289		strncpy(p, str_to_match + off[i].rm_so, n);
290		p += n - 1;
291		s++;
292		}
293		}
294		p++;
295		s++;
296		}
297		} else {
298		alias = xstrdup(a + 1);
299	}	}
300	}	}
	p++;
	s++;
301	}	}
	#else
	alias = xstrdup(a + 1);
	#endif
	}
	#endif /* ENABLE_FEATURE_MDEV_RENAME */
	#if ENABLE_FEATURE_MDEV_EXEC
	/* The rest (opt): command to run */
	if (!val)
	break;
	{
	const char *s = "@$*";
	const char *s2 = strchr(s, *val);
302
303	if (!s2)	if (ENABLE_FEATURE_MDEV_EXEC && val) {
304	bb_error_msg_and_die("bad line %u", parser->lineno);	const char *s = "$@*";
305		const char *s2 = strchr(s, val[0]);
306
307		if (!s2) {
308		bb_error_msg("bad line %u", parser->lineno);
309		if (ENABLE_FEATURE_MDEV_RENAME)
310		free(alias);
311		continue;
312		}
313
314	/* Correlate the position in the "@$*" with the delete	/* Are we running this command now?
315	* step so that we get the proper behavior:	* Run $cmd on delete, @cmd on create, *cmd on both
316	* @cmd: run on create	*/
317	* $cmd: run on delete	if (s2-s != delete)
318	* *cmd: run on both	command = xstrdup(val + 1);
	*/
	if ((s2 - s + 1) /*1/2/3*/ & /*1/2*/ (1 + delete)) {
	command = xstrdup(val + 1);
319	}	}
320	}	}
	#endif
	/* end of field parsing */
	break; /* we found matching line, stop */
	} /* end of "while line is read from /etc/mdev.conf" */
	config_close(parser);
	#endif /* ENABLE_FEATURE_MDEV_CONF */
	if (!delete && major >= 0) {
	if (ENABLE_FEATURE_MDEV_RENAME)
	unlink(device_name);
321
322	if (mknod(device_name, mode | type, makedev(major, minor)) && errno != EEXIST)	/* End of field parsing */
	bb_perror_msg_and_die("mknod %s", device_name);
323
324	if (major == root_major && minor == root_minor)	/* "Execute" the line we found */
325	symlink(device_name, "root");	{
326		const char *node_name;
327
328	#if ENABLE_FEATURE_MDEV_CONF	node_name = device_name;
329	chown(device_name, ugid.uid, ugid.gid);	if (ENABLE_FEATURE_MDEV_RENAME && alias)
330		node_name = alias = build_alias(alias, device_name);
331
332		if (!delete && major >= 0) {
333		if (mknod(node_name, mode | type, makedev(major, minor)) && errno != EEXIST)
334		bb_perror_msg("can't create %s", node_name);
335		if (major == root_major && minor == root_minor)
336		symlink(node_name, "root");
337		if (ENABLE_FEATURE_MDEV_CONF) {
338		chmod(node_name, mode);
339		chown(node_name, ugid.uid, ugid.gid);
340		}
341		if (ENABLE_FEATURE_MDEV_RENAME && alias) {
342		if (aliaslink == '>')
343		symlink(node_name, device_name);
344		}
345		}
346
347	#if ENABLE_FEATURE_MDEV_RENAME	if (ENABLE_FEATURE_MDEV_EXEC && command) {
348	if (alias) {	/* setenv will leak memory, use putenv/unsetenv/free */
349	alias = build_alias(alias, device_name);	char *s = xasprintf("%s=%s", "MDEV", node_name);
350		char *s1 = xasprintf("%s=%s", "SUBSYSTEM", subsystem);
351		putenv(s);
352		putenv(s1);
353		if (system(command) == -1)
354		bb_perror_msg("can't run '%s'", command);
355		unsetenv("SUBSYSTEM");
356		free(s1);
357		unsetenv("MDEV");
358		free(s);
359		free(command);
360		}
361
362	/* move the device, and optionally	if (delete) {
363	* make a symlink to moved device node */	if (ENABLE_FEATURE_MDEV_RENAME && alias) {
364	if (rename(device_name, alias) == 0 && aliaslink == '>')	if (aliaslink == '>')
365	symlink(alias, device_name);	unlink(device_name);
366		}
367		unlink(node_name);
368		}
369
370	free(alias);	if (ENABLE_FEATURE_MDEV_RENAME)
371		free(alias);
372	}	}
	#endif
	#endif
	}
373
374	#if ENABLE_FEATURE_MDEV_EXEC	/* We found matching line.
375	if (command) {	* Stop unless it was prefixed with '-' */
376	/* setenv will leak memory, use putenv/unsetenv/free */	if (ENABLE_FEATURE_MDEV_CONF && !keep_matching)
377	char *s = xasprintf("MDEV=%s", device_name);	break;
	putenv(s);
	if (system(command) == -1)
	bb_perror_msg_and_die("can't run '%s'", command);
	s[4] = '\0';
	unsetenv(s);
	free(s);
	free(command);
	}
	#endif
378
379	if (delete) {	/* end of "while line is read from /etc/mdev.conf" */
380	unlink(device_name);	} while (ENABLE_FEATURE_MDEV_CONF);
381	/* At creation time, device might have been moved
382	* and a symlink might have been created. Undo that. */	if (ENABLE_FEATURE_MDEV_CONF)
383	#if ENABLE_FEATURE_MDEV_RENAME	config_close(parser);
	if (alias) {
	alias = build_alias(alias, device_name);
	unlink(alias);
	free(alias);
	}
	#endif
	}
384	}	}
385
386	/* File callback for /sys/ traversal */	/* File callback for /sys/ traversal */
#	Line 324  static int FAST_FUNC dirAction(const cha	Line 409  static int FAST_FUNC dirAction(const cha
409	void *userData UNUSED_PARAM,	void *userData UNUSED_PARAM,
410	int depth)	int depth)
411	{	{
412		/* Extract device subsystem -- the name of the directory
413		* under /sys/class/ */
414		if (1 == depth) {
415		free(subsystem);
416		subsystem = strrchr(fileName, '/');
417		if (subsystem)
418		subsystem = xstrdup(subsystem + 1);
419		}
420
421	return (depth >= MAX_SYSFS_DEPTH ? SKIP : TRUE);	return (depth >= MAX_SYSFS_DEPTH ? SKIP : TRUE);
422	}	}
423
#	Line 338  static int FAST_FUNC dirAction(const cha	Line 432  static int FAST_FUNC dirAction(const cha
432	* - userspace writes "0" (worked) or "-1" (failed) to /sys/$DEVPATH/loading	* - userspace writes "0" (worked) or "-1" (failed) to /sys/$DEVPATH/loading
433	* - kernel loads firmware into device	* - kernel loads firmware into device
434	*/	*/
435	static void load_firmware(const char *const firmware, const char *const sysfs_path)	static void load_firmware(const char *firmware, const char *sysfs_path)
436	{	{
437	int cnt;	int cnt;
438	int firmware_fd, loading_fd, data_fd;	int firmware_fd, loading_fd, data_fd;
#	Line 361  static void load_firmware(const char *co	Line 455  static void load_firmware(const char *co
455	goto out;	goto out;
456
457	loading:	loading:
458	/* tell kernel we're loading by `echo 1 > /sys/$DEVPATH/loading` */	/* tell kernel we're loading by "echo 1 > /sys/$DEVPATH/loading" */
459	if (full_write(loading_fd, "1", 1) != 1)	if (full_write(loading_fd, "1", 1) != 1)
460	goto out;	goto out;
461
462	/* load firmware by `cat /lib/firmware/$FIRMWARE > /sys/$DEVPATH/data */	/* load firmware into /sys/$DEVPATH/data */
463	data_fd = open("data", O_WRONLY);	data_fd = open("data", O_WRONLY);
464	if (data_fd == -1)	if (data_fd == -1)
465	goto out;	goto out;
466	cnt = bb_copyfd_eof(firmware_fd, data_fd);	cnt = bb_copyfd_eof(firmware_fd, data_fd);
467
468	/* tell kernel result by `echo [0|-1] > /sys/$DEVPATH/loading` */	/* tell kernel result by "echo [0|-1] > /sys/$DEVPATH/loading" */
469	if (cnt > 0)	if (cnt > 0)
470	full_write(loading_fd, "0", 1);	full_write(loading_fd, "0", 1);
471	else	else
#	Line 392  int mdev_main(int argc UNUSED_PARAM, cha	Line 486  int mdev_main(int argc UNUSED_PARAM, cha
486
487	/* We can be called as hotplug helper */	/* We can be called as hotplug helper */
488	/* Kernel cannot provide suitable stdio fds for us, do it ourself */	/* Kernel cannot provide suitable stdio fds for us, do it ourself */
	#if 1
489	bb_sanitize_stdio();	bb_sanitize_stdio();
490	#else
491	/* Debug code */	/* Force the configuration file settings exactly */
492	/* Replace LOGFILE by other file or device name if you need */	umask(0);
	#define LOGFILE "/dev/console"
	/* Just making sure fd 0 is not closed,
	* we don't really intend to read from it */
	xmove_fd(xopen("/", O_RDONLY), STDIN_FILENO);
	xmove_fd(xopen(LOGFILE, O_WRONLY|O_APPEND), STDOUT_FILENO);
	xmove_fd(xopen(LOGFILE, O_WRONLY|O_APPEND), STDERR_FILENO);
	#endif
493
494	xchdir("/dev");	xchdir("/dev");
495
496	if (argv[1] && !strcmp(argv[1], "-s")) {	if (argv[1] && strcmp(argv[1], "-s") == 0) {
497	/* Scan:	/* Scan:
498	* mdev -s	* mdev -s
499	*/	*/
#	Line 421  int mdev_main(int argc UNUSED_PARAM, cha	Line 507  int mdev_main(int argc UNUSED_PARAM, cha
507	* /sys/block/loop* (for example) are symlinks to dirs,	* /sys/block/loop* (for example) are symlinks to dirs,
508	* not real directories.	* not real directories.
509	* (kernel's CONFIG_SYSFS_DEPRECATED makes them real dirs,	* (kernel's CONFIG_SYSFS_DEPRECATED makes them real dirs,
510	* but we can't enforce that on users) */	* but we can't enforce that on users)
511	recursive_action("/sys/block",	*/
512	ACTION_RECURSE | ACTION_FOLLOWLINKS,	if (access("/sys/class/block", F_OK) != 0) {
513	fileAction, dirAction, temp, 0);	/* Scan obsolete /sys/block only if /sys/class/block
514		* doesn't exist. Otherwise we'll have dupes.
515		* Also, do not complain if it doesn't exist.
516		* Some people configure kernel to have no blockdevs.
517		*/
518		recursive_action("/sys/block",
519		ACTION_RECURSE | ACTION_FOLLOWLINKS | ACTION_QUIET,
520		fileAction, dirAction, temp, 0);
521		}
522	recursive_action("/sys/class",	recursive_action("/sys/class",
523	ACTION_RECURSE | ACTION_FOLLOWLINKS,	ACTION_RECURSE | ACTION_FOLLOWLINKS,
524	fileAction, dirAction, temp, 0);	fileAction, dirAction, temp, 0);
525	} else {	} else {
526		char *fw;
527	char *seq;	char *seq;
528	char *action;	char *action;
529	char *env_path;	char *env_path;
530	char seqbuf[sizeof(int)*3 + 2];	static const char keywords[] ALIGN1 = "remove\0add\0";
531	int seqlen = seqlen; /* for compiler */	enum { OP_remove = 0, OP_add };
532		smalluint op;
533
534	/* Hotplug:	/* Hotplug:
535	* env ACTION=... DEVPATH=... [SEQNUM=...] mdev	* env ACTION=... DEVPATH=... SUBSYSTEM=... [SEQNUM=...] mdev
536	* ACTION can be "add" or "remove"	* ACTION can be "add" or "remove"
537	* DEVPATH is like "/block/sda" or "/class/input/mice"	* DEVPATH is like "/block/sda" or "/class/input/mice"
538	*/	*/
539	action = getenv("ACTION");	action = getenv("ACTION");
540	env_path = getenv("DEVPATH");	env_path = getenv("DEVPATH");
541	if (!action || !env_path)	subsystem = getenv("SUBSYSTEM");
542		if (!action || !env_path /*|| !subsystem*/)
543	bb_show_usage();	bb_show_usage();
544		fw = getenv("FIRMWARE");
545		op = index_in_strings(keywords, action);
546		/* If it exists, does /dev/mdev.seq match $SEQNUM?
547		* If it does not match, earlier mdev is running
548		* in parallel, and we need to wait */
549	seq = getenv("SEQNUM");	seq = getenv("SEQNUM");
550	if (seq) {	if (seq) {
551	int timeout = 2000 / 32;	int timeout = 2000 / 32; /* 2000 msec */
552	do {	do {
553		int seqlen;
554		char seqbuf[sizeof(int)*3 + 2];
555
556	seqlen = open_read_close("mdev.seq", seqbuf, sizeof(seqbuf-1));	seqlen = open_read_close("mdev.seq", seqbuf, sizeof(seqbuf-1));
557	if (seqlen < 0)	if (seqlen < 0) {
558		seq = NULL;
559	break;	break;
560		}
561	seqbuf[seqlen] = '\0';	seqbuf[seqlen] = '\0';
562	if (seqbuf[0] == '\n' /* seed file? */	if (seqbuf[0] == '\n' /* seed file? */
563	|| strcmp(seq, seqbuf) == 0 /* correct idx? */	|| strcmp(seq, seqbuf) == 0 /* correct idx? */
#	Line 463  int mdev_main(int argc UNUSED_PARAM, cha	Line 569  int mdev_main(int argc UNUSED_PARAM, cha
569	}	}
570
571	snprintf(temp, PATH_MAX, "/sys%s", env_path);	snprintf(temp, PATH_MAX, "/sys%s", env_path);
572	if (!strcmp(action, "remove"))	if (op == OP_remove) {
573	make_device(temp, 1);	/* Ignoring "remove firmware". It was reported
574	else if (!strcmp(action, "add")) {	* to happen and to cause erroneous deletion
575		* of device nodes. */
576		if (!fw)
577		make_device(temp, 1);
578		}
579		else if (op == OP_add) {
580	make_device(temp, 0);	make_device(temp, 0);
581	if (ENABLE_FEATURE_MDEV_LOAD_FIRMWARE) {	if (ENABLE_FEATURE_MDEV_LOAD_FIRMWARE) {
	char *fw = getenv("FIRMWARE");
582	if (fw)	if (fw)
583	load_firmware(fw, temp);	load_firmware(fw, temp);
584	}	}
585	}	}
586
587	if (seq && seqlen >= 0) {	if (seq) {
588	xopen_xwrite_close("mdev.seq", utoa(xatou(seq) + 1));	xopen_xwrite_close("mdev.seq", utoa(xatou(seq) + 1));
589	}	}
590	}	}
#	Line 483  int mdev_main(int argc UNUSED_PARAM, cha	Line 592  int mdev_main(int argc UNUSED_PARAM, cha
592	if (ENABLE_FEATURE_CLEAN_UP)	if (ENABLE_FEATURE_CLEAN_UP)
593	RELEASE_CONFIG_BUFFER(temp);	RELEASE_CONFIG_BUFFER(temp);
594
595	return 0;	return EXIT_SUCCESS;
596	}	}

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Legend: Removed from v.983   changed lines   Added in v.984