Contents of /trunk/mkinitrd-magellan/busybox/modutils/modutils.c
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Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
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File size: 4260 byte(s)
Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
File MIME type: text/plain
File size: 4260 byte(s)
-updated to busybox-1.16.1 and enabled blkid/uuid support in default config
1 | /* |
2 | * Common modutils related functions for busybox |
3 | * |
4 | * Copyright (C) 2008 by Timo Teras <timo.teras@iki.fi> |
5 | * |
6 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
7 | */ |
8 | #include "modutils.h" |
9 | |
10 | #ifdef __UCLIBC__ |
11 | extern int init_module(void *module, unsigned long len, const char *options); |
12 | extern int delete_module(const char *module, unsigned int flags); |
13 | #else |
14 | # include <sys/syscall.h> |
15 | # define init_module(mod, len, opts) syscall(__NR_init_module, mod, len, opts) |
16 | # define delete_module(mod, flags) syscall(__NR_delete_module, mod, flags) |
17 | #endif |
18 | |
19 | void FAST_FUNC replace(char *s, char what, char with) |
20 | { |
21 | while (*s) { |
22 | if (what == *s) |
23 | *s = with; |
24 | ++s; |
25 | } |
26 | } |
27 | |
28 | char* FAST_FUNC replace_underscores(char *s) |
29 | { |
30 | replace(s, '-', '_'); |
31 | return s; |
32 | } |
33 | |
34 | int FAST_FUNC string_to_llist(char *string, llist_t **llist, const char *delim) |
35 | { |
36 | char *tok; |
37 | int len = 0; |
38 | |
39 | while ((tok = strsep(&string, delim)) != NULL) { |
40 | if (tok[0] == '\0') |
41 | continue; |
42 | llist_add_to_end(llist, xstrdup(tok)); |
43 | len += strlen(tok); |
44 | } |
45 | return len; |
46 | } |
47 | |
48 | char* FAST_FUNC filename2modname(const char *filename, char *modname) |
49 | { |
50 | int i; |
51 | char *from; |
52 | |
53 | if (filename == NULL) |
54 | return NULL; |
55 | if (modname == NULL) |
56 | modname = xmalloc(MODULE_NAME_LEN); |
57 | from = bb_get_last_path_component_nostrip(filename); |
58 | for (i = 0; i < (MODULE_NAME_LEN-1) && from[i] != '\0' && from[i] != '.'; i++) |
59 | modname[i] = (from[i] == '-') ? '_' : from[i]; |
60 | modname[i] = '\0'; |
61 | |
62 | return modname; |
63 | } |
64 | |
65 | char* FAST_FUNC parse_cmdline_module_options(char **argv) |
66 | { |
67 | char *options; |
68 | int optlen; |
69 | |
70 | options = xzalloc(1); |
71 | optlen = 0; |
72 | while (*++argv) { |
73 | options = xrealloc(options, optlen + 2 + strlen(*argv) + 2); |
74 | /* Spaces handled by "" pairs, but no way of escaping quotes */ |
75 | optlen += sprintf(options + optlen, (strchr(*argv, ' ') ? "\"%s\" " : "%s "), *argv); |
76 | } |
77 | 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) |
120 | { |
121 | size_t image_size; |
122 | char *image; |
123 | 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 |
131 | if (get_linux_version_code() < KERNEL_VERSION(2,6,0)) |
132 | return bb_init_module_24(filename, options); |
133 | #endif |
134 | |
135 | image_size = INT_MAX - 4095; |
136 | mmaped = 0; |
137 | image = try_to_mmap_module(filename, &image_size); |
138 | if (image) { |
139 | mmaped = 1; |
140 | } else { |
141 | errno = ENOMEM; /* may be changed by e.g. open errors below */ |
142 | image = xmalloc_open_zipped_read_close(filename, &image_size); |
143 | 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; |
155 | } |
156 | |
157 | int FAST_FUNC bb_delete_module(const char *module, unsigned int flags) |
158 | { |
159 | 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 | } |