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authorRob Landley <rob@landley.net>2005-12-13 08:21:33 +0000
committerRob Landley <rob@landley.net>2005-12-13 08:21:33 +0000
commit70f7ef7be385f782e57106df523f1c5e16fbdc47 (patch)
treee560de3934ac70ae03dd77695450cff91bdfce0b /util-linux/mdev.c
parent3858bf18d5d3b6a858ca46acb6c8628715520d1c (diff)
downloadbusybox-70f7ef7be385f782e57106df523f1c5e16fbdc47.tar.gz
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.c121
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;
+}