1 files changed, 24 insertions, 0 deletions
diff --git a/libc/src/lseek.c b/libc/src/lseek.c
new file mode 100644
index 0000000..bffc81f
--- /dev/null
+++ b/libc/src/lseek.c
@@ -0,0 +1,24 @@
+#include "reent.h"
+#include "errno.h"
+#include <fio.h>
+
+off_t lseek(int fd, off_t seek, int wheel) {
+    off_t r;
+    
+    if ((wheel != SEEK_SET) && (wheel != SEEK_CUR) && (wheel != SEEK_END)) {
+        _impure_ptr->_errno = EINVAL;
+        return -1;
+    }
+    
+    if (!fio_is_open(fd)) {
+        _impure_ptr->_errno = EBADF;
+        return -1;
+    }
+    
+    r = fio_seek(fd, seek, wheel);
+    
+    if (r < 0)
+        _impure_ptr->_errno = EINVAL;
+    
+    return r;
+}