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...)

1 files changed, 29 insertions, 14 deletions

diff --git a/util-linux/mdev.c b/util-linux/mdev.c
index 10369ded3..135843581 100644
--- 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;
 }