[BusyBox 0001471]: support device symlinks in /sys

[bugs at busybox.net]

The following issue has been SUBMITTED. 
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http://busybox.net/bugs/view.php?id=1471 
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Reported By:                levin
Assigned To:                BusyBox
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Project:                    BusyBox
Issue ID:                   1471
Category:                   New Features
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     assigned
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Date Submitted:             08-24-2007 03:11 PDT
Last Modified:              08-24-2007 03:11 PDT
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Summary:                    support device symlinks in /sys
Description: 
This patch is again busybox 1.6.1.

In linux kernel 2.6.22.3, I find that tty1 in /dev/class/tty/ is actually

symbol link to ../../devices/virtual/tty/tty1, and mdev in busybox 1.6.1 
won't create the device node. So I write this patch to solve it.

diff --git a/util-linux/mdev.c b/util-linux/mdev.c
index a4716e2..1a6a86f 100644
--- a/util-linux/mdev.c
+++ b/util-linux/mdev.c
@@ -219,12 +219,22 @@ static void find_dev(char *path)
                // uClibc doesn't fill out entry->d_type reliably. so we
use lstat().
 
                snprintf(path+len, PATH_MAX-len, "/%s", entry->d_name);
-               if (!lstat(path, &st) && S_ISDIR(st.st_mode))
find_dev(path);
-               path[len] = 0;
-
-               /* If there's a dev entry, mknod it */
-
-               if (!strcmp(entry->d_name, "dev")) make_device(path, 0);
+               if (lstat(path, &st))
+                       continue;
+               if (S_ISDIR(st.st_mode))
+                       find_dev(path);
+               else if (S_ISLNK(st.st_mode)) {
+                       snprintf(path+len, PATH_MAX-len, "/%s/dev",
entry->d_name);
+                       if (!lstat(path, &st) && S_ISREG(st.st_mode)) {
+                               snprintf(path+len, PATH_MAX-len, "/%s",
entry->d_name);
+                               make_device(path, 0);
+                       }
+               }
+               else if (S_ISREG(st.st_mode) && !strcmp(entry->d_name,
"dev")) {
+                       /* This is a dev entry, mknod it */
+                       path[len] = 0;
+                       make_device(path, 0);
+                }
        }
 
        closedir(dir);

It's not neat. Hope it helps anyway.

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Issue History 
Date Modified   Username       Field                    Change               
====================================================================== 
08-24-07 03:12  levin          New Issue                                    
08-24-07 03:12  levin          Status                   new => assigned     
08-24-07 03:12  levin          Assigned To               => BusyBox         
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