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;
+}