diff options
author | Rob Landley <rob@landley.net> | 2005-12-13 11:21:33 +0300 |
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committer | Rob Landley <rob@landley.net> | 2005-12-13 11:21:33 +0300 |
commit | 70f7ef7be385f782e57106df523f1c5e16fbdc47 (patch) | |
tree | e560de3934ac70ae03dd77695450cff91bdfce0b /util-linux/mdev.c | |
parent | 3858bf18d5d3b6a858ca46acb6c8628715520d1c (diff) |
Nothing to see here. Move along.
Not buying it, eh?
I know I said new features before 1.1, but, well... (I was weak!)
The config file and hotplug modes aren't implemented yet. Might take a stab at
those tomorrow. (I _should_ go back to focusing on the bug triage list.)
Diffstat (limited to 'util-linux/mdev.c')
-rw-r--r-- | util-linux/mdev.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/util-linux/mdev.c b/util-linux/mdev.c new file mode 100644 index 000000000..49904d17a --- /dev/null +++ b/util-linux/mdev.c @@ -0,0 +1,121 @@ +/* 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; +} |