Frank Sorenson added hotplug support to mdev. (I tweaked it a bit. Need

to come up with a test suite for all the stuff that requires root access.
Something involving User Mode Linux or QEMU, probably...)

diff --git a/util-linux/mdev.c b/util-linux/mdev.c
index 10369de..1358435 100644 (file)
--- a/util-linux/mdev.c
+++ b/util-linux/mdev.c
@@ -18,6 +18,7 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
+#include <stdlib.h>
 #include "busybox.h"
 #include "xregex.h"
 
@@ -209,20 +210,34 @@ static void find_dev(char *path)
 
 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 */
+       char *action;
+       char *env_path;
+       RESERVE_CONFIG_BUFFER(temp,PATH_MAX);
+
+       /* Scan */
        
+       if (argc == 2 && !strcmp(argv[1],"-s")) {
+               strcpy(temp,"/sys/block");
+               find_dev(temp);
+               strcpy(temp,"/sys/class");
+               find_dev(temp);
+
+       /* Hotplug */
+
+       } else {
+               action = getenv("ACTION");
+               env_path = getenv("DEVPATH");
+           if (!action || !env_path) bb_show_usage();
+               
+               if (!strcmp(action, "add")) {
+                       sprintf(temp, "/sys%s", env_path);
+                       make_device(temp);
+               } else if (!strcmp(action, "remove")) {
+                       sprintf(temp, "%s/%s", DEV_PATH, strrchr(env_path, '/') + 1);
+                       unlink(temp);
+               }
+       }
+
+       if(ENABLE_FEATURE_CLEAN_UP) RELEASE_CONFIG_BUFFER(temp);
        return 0;
 }