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

Parent Directory | Revision Log | Patch

	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 5	Line 5
5	*	*
6	* 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.
7	*/	*/
8	#include "modutils.h"	#include "modutils.h"
9
10	#ifdef __UCLIBC__	#ifdef __UCLIBC__
#	Line 17  extern int delete_module(const char *mod	Line 16  extern int delete_module(const char *mod
16	# define delete_module(mod, flags) syscall(__NR_delete_module, mod, flags)	# define delete_module(mod, flags) syscall(__NR_delete_module, mod, flags)
17	#endif	#endif
18
	USE_FEATURE_2_4_MODULES(char *insmod_outputname);
	/*
	a libbb candidate from ice age!
	*/
	llist_t FAST_FUNC *llist_find(llist_t *first, const char *str)
	{
	while (first != NULL) {
	if (strcmp(first->data, str) == 0)
	return first;
	first = first->link;
	}
	return NULL;
	}
19	void FAST_FUNC replace(char *s, char what, char with)	void FAST_FUNC replace(char *s, char what, char with)
20	{	{
21	while (*s) {	while (*s) {
#	Line 41  void FAST_FUNC replace(char *s, char wha	Line 25  void FAST_FUNC replace(char *s, char wha
25	}	}
26	}	}
27
28	char * FAST_FUNC replace_underscores(char *s)	char* FAST_FUNC replace_underscores(char *s)
29	{	{
30	replace(s, '-', '_');	replace(s, '-', '_');
31	return s;	return s;
#	Line 61  int FAST_FUNC string_to_llist(char *stri	Line 45  int FAST_FUNC string_to_llist(char *stri
45	return len;	return len;
46	}	}
47
48	char * FAST_FUNC filename2modname(const char *filename, char *modname)	char* FAST_FUNC filename2modname(const char *filename, char *modname)
49	{	{
50	int i;	int i;
51	char *from;	char *from;
#	Line 73  char * FAST_FUNC filename2modname(const	Line 57  char * FAST_FUNC filename2modname(const
57	from = bb_get_last_path_component_nostrip(filename);	from = bb_get_last_path_component_nostrip(filename);
58	for (i = 0; i < (MODULE_NAME_LEN-1) && from[i] != '\0' && from[i] != '.'; i++)	for (i = 0; i < (MODULE_NAME_LEN-1) && from[i] != '\0' && from[i] != '.'; i++)
59	modname[i] = (from[i] == '-') ? '_' : from[i];	modname[i] = (from[i] == '-') ? '_' : from[i];
60	modname[i] = 0;	modname[i] = '\0';
61
62	return modname;	return modname;
63	}	}
64
65	const char * FAST_FUNC moderror(int err)	char* FAST_FUNC parse_cmdline_module_options(char **argv)
	{
	switch (err) {
	case -1:
	return "no such module";
	case ENOEXEC:
	return "invalid module format";
	case ENOENT:
	return "unknown symbol in module, or unknown parameter";
	case ESRCH:
	return "module has wrong symbol version";
	case ENOSYS:
	return "kernel does not support requested operation";
	default:
	return strerror(err);
	}
	}
	char * FAST_FUNC parse_cmdline_module_options(char **argv)
66	{	{
67	char *options;	char *options;
68	int optlen;	int optlen;
#	Line 111  char * FAST_FUNC parse_cmdline_module_op	Line 77  char * FAST_FUNC parse_cmdline_module_op
77	return options;	return options;
78	}	}
79
80		#if ENABLE_FEATURE_INSMOD_TRY_MMAP
81		void* FAST_FUNC try_to_mmap_module(const char *filename, size_t *image_size_p)
82		{
83		/* We have user reports of failure to load 3MB module
84		* on a 16MB RAM machine. Apparently even a transient
85		* memory spike to 6MB during module load
86		* is too big for that system. */
87		void *image;
88		struct stat st;
89		int fd;
90
91		fd = xopen(filename, O_RDONLY);
92		fstat(fd, &st);
93		image = NULL;
94		/* st.st_size is off_t, we can't just pass it to mmap */
95		if (st.st_size <= *image_size_p) {
96		size_t image_size = st.st_size;
97		image = mmap(NULL, image_size, PROT_READ, MAP_PRIVATE, fd, 0);
98		if (image == MAP_FAILED) {
99		image = NULL;
100		} else if (*(uint32_t*)image != SWAP_BE32(0x7f454C46)) {
101		/* No ELF signature. Compressed module? */
102		munmap(image, image_size);
103		image = NULL;
104		} else {
105		/* Success. Report the size */
106		*image_size_p = image_size;
107		}
108		}
109		close(fd);
110		return image;
111		}
112		#endif
113
114		/* Return:
115		* 0 on success,
116		* -errno on open/read error,
117		* errno on init_module() error
118		*/
119	int FAST_FUNC bb_init_module(const char *filename, const char *options)	int FAST_FUNC bb_init_module(const char *filename, const char *options)
120	{	{
121	size_t len = MAXINT(ssize_t);	size_t image_size;
122	char *image;	char *image;
123	int rc = ENOENT;	int rc;
124		bool mmaped;
125
126		if (!options)
127		options = "";
128
129		//TODO: audit bb_init_module_24 to match error code convention
130	#if ENABLE_FEATURE_2_4_MODULES	#if ENABLE_FEATURE_2_4_MODULES
131	if (get_linux_version_code() < KERNEL_VERSION(2,6,0))	if (get_linux_version_code() < KERNEL_VERSION(2,6,0))
132	return bb_init_module_24(filename, options);	return bb_init_module_24(filename, options);
133	#endif	#endif
134
135	/* Use the 2.6 way */	image_size = INT_MAX - 4095;
136	image = xmalloc_open_zipped_read_close(filename, &len);	mmaped = 0;
137		image = try_to_mmap_module(filename, &image_size);
138	if (image) {	if (image) {
139	if (init_module(image, len, options) != 0)	mmaped = 1;
140	rc = errno;	} else {
141	else	errno = ENOMEM; /* may be changed by e.g. open errors below */
142	rc = 0;	image = xmalloc_open_zipped_read_close(filename, &image_size);
143	free(image);	if (!image)
144		return -errno;
145	}	}
146
147		errno = 0;
148		init_module(image, image_size, options);
149		rc = errno;
150		if (mmaped)
151		munmap(image, image_size);
152		else
153		free(image);
154	return rc;	return rc;
155	}	}
156
157	int FAST_FUNC bb_delete_module(const char *module, unsigned int flags)	int FAST_FUNC bb_delete_module(const char *module, unsigned int flags)
158	{	{
159	return delete_module(module, flags);	errno = 0;
160		delete_module(module, flags);
161		return errno;
162		}
163
164		const char* FAST_FUNC moderror(int err)
165		{
166		switch (err) {
167		case -1: /* btw: it's -EPERM */
168		return "no such module";
169		case ENOEXEC:
170		return "invalid module format";
171		case ENOENT:
172		return "unknown symbol in module, or unknown parameter";
173		case ESRCH:
174		return "module has wrong symbol version";
175		case ENOSYS:
176		return "kernel does not support requested operation";
177		}
178		if (err < 0) /* should always be */
179		err = -err;
180		return strerror(err);
181	}	}

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