2 * Common modutils related functions for busybox
4 * Copyright (C) 2008 by Timo Teras <timo.teras@iki.fi>
6 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
11 extern int init_module(void *module, unsigned long len, const char *options);
12 extern int delete_module(const char *module, unsigned int flags);
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)
19 void FAST_FUNC replace(char *s, char what, char with)
28 char* FAST_FUNC replace_underscores(char *s)
34 int FAST_FUNC string_to_llist(char *string, llist_t **llist, const char *delim)
39 while ((tok = strsep(&string, delim)) != NULL) {
42 llist_add_to_end(llist, xstrdup(tok));
48 char* FAST_FUNC filename2modname(const char *filename, char *modname)
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];
65 char* FAST_FUNC parse_cmdline_module_options(char **argv)
73 options = xrealloc(options, optlen + 2 + strlen(*argv) + 2);
74 optlen += sprintf(options + optlen, "%s ", *argv);
79 #if ENABLE_FEATURE_INSMOD_TRY_MMAP
80 void* FAST_FUNC try_to_mmap_module(const char *filename, size_t *image_size_p)
82 /* We have user reports of failure to load 3MB module
83 * on a 16MB RAM machine. Apparently even a transient
84 * memory spike to 6MB during module load
85 * is too big for that system. */
90 fd = xopen(filename, O_RDONLY);
93 /* st.st_size is off_t, we can't just pass it to mmap */
94 if (st.st_size <= *image_size_p) {
95 size_t image_size = st.st_size;
96 image = mmap(NULL, image_size, PROT_READ, MAP_PRIVATE, fd, 0);
97 if (image == MAP_FAILED) {
99 } else if (*(uint32_t*)image != SWAP_BE32(0x7f454C46)) {
100 /* No ELF signature. Compressed module? */
101 munmap(image, image_size);
104 /* Success. Report the size */
105 *image_size_p = image_size;
115 * -errno on open/read error,
116 * errno on init_module() error
118 int FAST_FUNC bb_init_module(const char *filename, const char *options)
128 //TODO: audit bb_init_module_24 to match error code convention
129 #if ENABLE_FEATURE_2_4_MODULES
130 if (get_linux_version_code() < KERNEL_VERSION(2,6,0))
131 return bb_init_module_24(filename, options);
134 image_size = INT_MAX - 4095;
136 image = try_to_mmap_module(filename, &image_size);
140 errno = ENOMEM; /* may be changed by e.g. open errors below */
141 image = xmalloc_open_zipped_read_close(filename, &image_size);
147 init_module(image, image_size, options);
150 munmap(image, image_size);
156 int FAST_FUNC bb_delete_module(const char *module, unsigned int flags)
159 delete_module(module, flags);
163 const char* FAST_FUNC moderror(int err)
166 case -1: /* btw: it's -EPERM */
167 return "no such module";
169 return "invalid module format";
171 return "unknown symbol in module, or unknown parameter";
173 return "module has wrong symbol version";
175 return "kernel does not support requested operation";
177 if (err < 0) /* should always be */
179 return strerror(err);