Restore fixes needed for wxRenderer functions to work with wxGCDC.

[wxWidgets.git] / src / common / file.cpp

diff --git a/src/common/file.cpp b/src/common/file.cpp
index a6d96d6a8ed45e6625c4a0ce17bfd46a3850033b..58e36f221899a1557a96c7015cb2871b53b73092 100644 (file)
--- a/src/common/file.cpp
+++ b/src/common/file.cpp
@@ -393,6 +393,21 @@ wxFileOffset wxFile::Length() const
 {
     wxASSERT( IsOpened() );
 
+    // we use a special method for Linux systems where files in sysfs (i.e.
+    // those under /sys typically) return length of 4096 bytes even when
+    // they're much smaller -- this is a problem as it results in errors later
+    // when we try reading 4KB from them
+#ifdef __LINUX__
+    struct stat st;
+    if ( fstat(m_fd, &st) == 0 )
+    {
+        // returning 0 for the special files indicates to the caller that they
+        // are not seekable
+        return st.st_blocks ? st.st_size : 0;
+    }
+    //else: failed to stat, try the normal method
+#endif // __LINUX__
+
     wxFileOffset iRc = Tell();
     if ( iRc != wxInvalidOffset ) {
         // have to use const_cast :-(