136 lines
3.4 KiB
C
136 lines
3.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* depmod - generate modules.dep
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* Copyright (c) 2008 Bernhard Fischer
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#undef _GNU_SOURCE
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#define _GNU_SOURCE
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#include <libbb.h>
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#include <sys/utsname.h> /* uname() */
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/*
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* Theory of operation:
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* - iterate over all modules and record their full path
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* - iterate over all modules looking for "depends=" entries
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* for each depends, look through our list of full paths and emit if found
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*/
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struct globals {
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llist_t *lst;
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};
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#define G (*(struct globals*)&bb_common_bufsiz1)
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/* We have to zero it out because of NOEXEC */
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#define INIT_G() memset(&G, 0, sizeof(G))
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static int fill_lst(const char *modulename, struct stat ATTRIBUTE_UNUSED *sb,
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void ATTRIBUTE_UNUSED *data, int ATTRIBUTE_UNUSED depth)
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{
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llist_add_to(&G.lst, strdup(modulename));
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return TRUE;
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}
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static int fileAction(const char *fname, struct stat *sb,
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void *data, int ATTRIBUTE_UNUSED depth)
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{
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size_t len = sb->st_size;
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void *the_module, *ptr;
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int fd;
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char *depends, *deps;
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/*XXX: FIXME: does not handle compressed modules!
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* There should be a function that looks at the extension and sets up
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* open_transformer for us.
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*/
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if (last_char_is(fname, 'o') == NULL) /* not a module */
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goto skip;
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fd = xopen(fname, O_RDONLY);
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the_module = mmap(NULL, len, PROT_READ, MAP_SHARED
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#if defined MAP_POPULATE
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|MAP_POPULATE
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#endif
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, fd, 0);
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close(fd);
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if (the_module == MAP_FAILED)
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bb_perror_msg_and_die("mmap");
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ptr = the_module;
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fprintf((FILE*)data, "\n%s:", fname);
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//bb_info_msg("fname='%s'", fname);
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do {
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/* search for a 'd' */
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ptr = memchr(ptr, 'd', len);
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if (ptr == NULL) /* no d left, done */
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goto done;
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if (memcmp(ptr, "depends=", sizeof("depends=")-1) == 0)
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break;
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len -= ++ptr - the_module;
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} while (1);
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deps = depends = strdup (ptr + sizeof("depends=")-1);
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//bb_info_msg(" depends='%s'", depends);
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while (*deps) {
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llist_t * _lst = G.lst;
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char *buf1;
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ptr = strchr(deps, ',');
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if (ptr != NULL)
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*(char*)ptr = '\0';
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/* remember the length of the current dependency plus eventual 0 byte */
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len = strlen(deps) + (ptr != NULL);
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buf1 = xmalloc(len + 3);
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sprintf(buf1, "/%s.", deps); /* make sure we match the correct file */
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while (_lst) {
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ptr = strstr(_lst->data, buf1);
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if (ptr != NULL)
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break; /* found it */
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_lst = _lst->link;
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}
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free(buf1);
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if (_lst /*&& _lst->data*/) {
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//bb_info_msg("[%s] -> '%s'", deps, _lst->data);
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fprintf((FILE*)data, " %s", _lst->data);
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deps += len;
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}
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}
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free(depends);
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done:
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munmap(the_module, sb->st_size);
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skip:
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return TRUE;
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}
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int depmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int depmod_main(int ATTRIBUTE_UNUSED argc, char **argv)
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{
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int retval = EXIT_SUCCESS;
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// static const char moddir_base[] ALIGN1 = "/lib/modules/%s";
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FILE *filedes = xfopen("/tmp/modules.dep", "w");
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argv++;
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do {
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if (!recursive_action(*argv,
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ACTION_RECURSE, /* flags */
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fill_lst, /* file action */
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NULL, /* dir action */
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NULL, /* user data */
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0) || /* depth */
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!recursive_action(*argv,
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ACTION_RECURSE, /* flags */
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fileAction, /* file action */
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NULL, /* dir action */
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(void*)filedes, /* user data */
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0)) { /* depth */
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retval = EXIT_FAILURE;
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}
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} while (*++argv);
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if (ENABLE_FEATURE_CLEAN_UP) {
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fclose(filedes);
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llist_free(G.lst, free);
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}
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return retval;
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}
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