Changes in uspace/lib/c/generic/vfs/vfs.c [6b8e5b7:089385e8] in mainline

File:

• uspace/lib/c/generic/vfs/vfs.c (modified) (3 diffs)

uspace/lib/c/generic/vfs/vfs.c

@@ -58 +58 @@
 static async_sess_t *vfs_sess = NULL;
 
+/* Current (working) directory. */
 static FIBRIL_MUTEX_INITIALIZE(cwd_mutex);
-
 static int cwd_fd = -1;
 static char *cwd_path = NULL;
 static size_t cwd_size = 0;
+
+/* Previous directory. */
+static FIBRIL_MUTEX_INITIALIZE(pwd_mutex);
+static int pwd_fd = -1;
+static char *pwd_path = NULL;
+static size_t pwd_size = 0;
+
 
 /** Start an async exchange on the VFS session.
@@ -751 +758 @@
         fibril_mutex_lock(&cwd_mutex);
         
-        if (cwd_fd >= 0)
-                close(cwd_fd);
-        
-        
-        if (cwd_path)
-                free(cwd_path);
-        
+
+        fibril_mutex_lock(&pwd_mutex);
+
+        if (pwd_fd >= 0)
+                close(pwd_fd);
+
+
+        if (pwd_path)
+                free(pwd_path);
+
+
+        pwd_fd = cwd_fd;
+        pwd_path = cwd_path;
+        pwd_size = cwd_size;
+
+        fibril_mutex_unlock(&pwd_mutex);
+
         cwd_fd = fd;
         cwd_path = abs;
@@ -781 +798 @@
         fibril_mutex_unlock(&cwd_mutex);
         
+        return buf;
+}
+
+
+char *getprevwd(char *buf, size_t size)
+{
+        if (size == 0)
+                return NULL;
+
+        fibril_mutex_lock(&pwd_mutex);
+
+        if ((pwd_size == 0) || (size < pwd_size + 1)) {
+                fibril_mutex_unlock(&pwd_mutex);
+                return NULL;
+        }
+
+        str_cpy(buf, size, pwd_path);
+        fibril_mutex_unlock(&pwd_mutex);
+
         return buf;
 }