122 lines
2.5 KiB
C
122 lines
2.5 KiB
C
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/* vi:set ts=4:
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*
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* mdev - Mini udev for busybox
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*
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* Copyright 2005 Rob Landley <rob@landley.net>
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* Copyright 2005 Frank Sorenson <frank@tuxrocks.com>
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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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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#define DEV_PATH "/dev"
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#define DEV_MODE 0660
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#include <busybox.h>
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/* mknod in /dev based on a path like "/sys/block/hda/hda1" */
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void make_device(char *path)
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{
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char *device_name, *s;
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int major,minor,type,len,fd;
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RESERVE_CONFIG_BUFFER(temp,PATH_MAX);
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/* Try to read major/minor string */
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snprintf(temp, PATH_MAX, "%s/dev", path);
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fd = open(temp, O_RDONLY);
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len = read(fd, temp, PATH_MAX-1);
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if (len<1) goto end;
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temp[len] = 0;
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close(fd);
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/* Determine device name, type, major and minor */
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device_name = strrchr(path, '/') + 1;
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type = strncmp(path+5, "block/" ,6) ? S_IFCHR : S_IFBLK;
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major = minor = 0;
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for(s = temp; *s; s++) {
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if(*s == ':') {
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major = minor;
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minor = 0;
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} else {
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minor *= 10;
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minor += (*s) - '0';
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}
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}
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/* Open config file here, look up permissions */
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sprintf(temp, "%s/%s", DEV_PATH, device_name);
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if(mknod(temp, DEV_MODE | type, makedev(major, minor)) && errno != EEXIST)
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bb_perror_msg_and_die("mknod %s failed", temp);
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/* Perform shellout here */
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end:
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RELEASE_CONFIG_BUFFER(temp);
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}
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/* Recursive search of /sys/block or /sys/class. path must be a writeable
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* buffer of size PATH_MAX containing the directory string to start at. */
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void find_dev(char *path)
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{
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DIR *dir;
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int len=strlen(path);
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if(!(dir = opendir(path)))
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bb_perror_msg_and_die("No %s",path);
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for(;;) {
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struct dirent *entry = readdir(dir);
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if(!entry) break;
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/* Skip "." and ".." (also skips hidden files, which is ok) */
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if (entry->d_name[0]=='.') continue;
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if (entry->d_type == DT_DIR) {
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snprintf(path+len, PATH_MAX-len, "/%s", entry->d_name);
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find_dev(path);
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path[len] = 0;
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}
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/* If there's a dev entry, mknod it */
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if (strcmp(entry->d_name, "dev")) make_device(path);
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}
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closedir(dir);
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}
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int mdev_main(int argc, char *argv[])
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{
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if (argc > 1) {
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if(argc == 2 && !strcmp(argv[1],"-s")) {
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RESERVE_CONFIG_BUFFER(temp,PATH_MAX);
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strcpy(temp,"/sys/block");
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find_dev(temp);
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strcpy(temp,"/sys/class");
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find_dev(temp);
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if(ENABLE_FEATURE_CLEAN_UP)
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RELEASE_CONFIG_BUFFER(temp);
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return 0;
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} else bb_show_usage();
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}
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/* hotplug support goes here */
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return 0;
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}
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