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/* vi:set ts=4:
*
* mdev - Mini udev for busybox
*
* Copyright 2005 Rob Landley <rob@landley.net>
* Copyright 2005 Frank Sorenson <frank@tuxrocks.com>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#define DEV_PATH "/dev"
#define DEV_MODE 0660
#include <busybox.h>
/* mknod in /dev based on a path like "/sys/block/hda/hda1" */
void make_device(char *path)
{
char *device_name, *s;
int major,minor,type,len,fd;
RESERVE_CONFIG_BUFFER(temp,PATH_MAX);
/* Try to read major/minor string */
snprintf(temp, PATH_MAX, "%s/dev", path);
fd = open(temp, O_RDONLY);
len = read(fd, temp, PATH_MAX-1);
if (len<1) goto end;
temp[len] = 0;
close(fd);
/* Determine device name, type, major and minor */
device_name = strrchr(path, '/') + 1;
type = strncmp(path+5, "block/" ,6) ? S_IFCHR : S_IFBLK;
major = minor = 0;
for(s = temp; *s; s++) {
if(*s == ':') {
major = minor;
minor = 0;
} else {
minor *= 10;
minor += (*s) - '0';
}
}
/* Open config file here, look up permissions */
sprintf(temp, "%s/%s", DEV_PATH, device_name);
if(mknod(temp, DEV_MODE | type, makedev(major, minor)) && errno != EEXIST)
bb_perror_msg_and_die("mknod %s failed", temp);
/* Perform shellout here */
end:
RELEASE_CONFIG_BUFFER(temp);
}
/* Recursive search of /sys/block or /sys/class. path must be a writeable
* buffer of size PATH_MAX containing the directory string to start at. */
void find_dev(char *path)
{
DIR *dir;
int len=strlen(path);
if(!(dir = opendir(path)))
bb_perror_msg_and_die("No %s",path);
for(;;) {
struct dirent *entry = readdir(dir);
if(!entry) break;
/* Skip "." and ".." (also skips hidden files, which is ok) */
if (entry->d_name[0]=='.') continue;
if (entry->d_type == DT_DIR) {
snprintf(path+len, PATH_MAX-len, "/%s", entry->d_name);
find_dev(path);
path[len] = 0;
}
/* If there's a dev entry, mknod it */
if (strcmp(entry->d_name, "dev")) make_device(path);
}
closedir(dir);
}
int mdev_main(int argc, char *argv[])
{
if (argc > 1) {
if(argc == 2 && !strcmp(argv[1],"-s")) {
RESERVE_CONFIG_BUFFER(temp,PATH_MAX);
strcpy(temp,"/sys/block");
find_dev(temp);
strcpy(temp,"/sys/class");
find_dev(temp);
if(ENABLE_FEATURE_CLEAN_UP)
RELEASE_CONFIG_BUFFER(temp);
return 0;
} else bb_show_usage();
}
/* hotplug support goes here */
return 0;
}
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