vserver plugin: Use `readdir_r' instead of `readdir'.

`readdir' is not thread safe, so use the (more thread safe) `readdir_r'.
Also, don't use the non-standard `d_type' member of the `dirent'
structure - it's not portable.

I'm aware that this plugin is very Linux specific and Linux most likely
will never use another C library than the GNU libc, but using this
member prevents me from compiling with the most restrictive `strict'
settings..

diff --git a/src/vserver.c b/src/vserver.c
index 5484344..7188b13 100644 (file)
--- a/src/vserver.c
+++ b/src/vserver.c
@@ -117,11 +117,19 @@ static inline long long __get_sock_bytes(const char *s)
 
 static int vserver_read (void)
 {
+#if NAME_MAX < 1024
+# define DIRENT_BUFFER_SIZE (sizeof (struct dirent) + 1024 + 1)
+#else
+# define DIRENT_BUFFER_SIZE (sizeof (struct dirent) + NAME_MAX + 1)
+#endif
+
        DIR                     *proc;
        struct dirent   *dent; /* 42 */
+       char dirent_buffer[DIRENT_BUFFER_SIZE];
 
        errno = 0;
-       if (NULL == (proc = opendir (PROCDIR)))
+       proc = opendir (PROCDIR);
+       if (proc == NULL)
        {
                char errbuf[1024];
                ERROR ("vserver plugin: fopen (%s): %s", PROCDIR, 
@@ -129,21 +137,51 @@ static int vserver_read (void)
                return (-1);
        }
 
-       while (NULL != (dent = readdir (proc)))
+       while (42)
        {
-               int  len;
+               size_t len;
                char file[BUFSIZE];
 
                FILE *fh;
                char buffer[BUFSIZE];
 
+               struct stat statbuf;
                char *cols[4];
 
+               int status;
+
+               status = readdir_r (proc, (struct dirent *) dirent_buffer, &dent);
+               if (status != 0)
+               {
+                       char errbuf[4096];
+                       ERROR ("vserver plugin: readdir_r failed: %s",
+                                       sstrerror (errno, errbuf, sizeof (errbuf)));
+                       closedir (proc);
+                       return (-1);
+               }
+               else if (dent == NULL)
+               {
+                       /* end of directory */
+                       break;
+               }
+
                if (dent->d_name[0] == '.')
                        continue;
 
-               /* This is not a directory */
-               if (dent->d_type != DT_DIR)
+               len = snprintf (file, sizeof (file), PROCDIR "/%s", dent->d_name);
+               if ((len < 0) || (len >= BUFSIZE))
+                       continue;
+               
+               status = stat (file, &statbuf);
+               if (status != 0)
+               {
+                       char errbuf[4096];
+                       WARNING ("vserver plugin: stat (%s) failed: %s",
+                                       file, sstrerror (errno, errbuf, sizeof (errbuf)));
+                       continue;
+               }
+               
+               if (!S_ISDIR (statbuf.st_mode))
                        continue;
 
                /* socket message accounting */