2 files changed, 11 insertions, 0 deletions

diff --git a/uisimulator/x11/file.h b/uisimulator/x11/file.h
index cf77eea4ba..f11f5056c9 100644
--- a/uisimulator/x11/file.h
+++ b/uisimulator/x11/file.h
@@ -25,12 +25,14 @@
 
 int x11_open(char *name, int opts);
 int x11_close(int fd);
+int x11_filesize(int fd);
 int x11_creat(char *name, int mode);
 int x11_remove(char *name);
 int x11_rename(char *oldpath, char *newpath);
 
 #define open(x,y) x11_open(x,y)
 #define close(x) x11_close(x)
+#define filesize(x) x11_filesize(x)
 #define creat(x,y) x11_creat(x,y)
 #define remove(x) x11_remove(x)
 #define rename(x,y) x11_rename(x,y)
diff --git a/uisimulator/x11/io.c b/uisimulator/x11/io.c
index bc9c99fa10..c33a42d636 100644
--- a/uisimulator/x11/io.c
+++ b/uisimulator/x11/io.c
@@ -156,6 +156,15 @@ int x11_rename(char *oldpath, char* newpath)
     return -1;
 }
 
+int x11_filesize(int fd)
+{
+    int old = lseek(fd, 0, SEEK_CUR);
+    int size = lseek(fd, 0, SEEK_END);
+    lseek(fd, old, SEEK_SET);
+
+    return(size);
+}
+
 void fat_size(unsigned int* size, unsigned int* free)
 {
     struct statfs fs;