Linux implementation of ftruncate64.

diff --git a/sysdeps/unix/sysv/linux/ftruncate64.c b/sysdeps/unix/sysv/linux/ftruncate64.c
new file mode 100644 (file)
index 0000000..e17d43b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/ftruncate64.c
@@ -0,0 +1,67 @@
+/* Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <sys/types.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include <sysdep.h>
+#include <sys/syscall.h>
+
+#ifdef __NR_ftruncate64
+#ifndef __ASSUME_TRUNCATE64_SYSCALL
+/* The variable is shared between all wrappers around *truncate64 calls.  */
+extern int have_no_truncate64;
+#endif
+
+extern int __syscall_ftruncate64 (int fd, int high_length, int low_length);
+
+
+/* Truncate the file FD refers to to LENGTH bytes.  */
+int
+ftruncate64 (fd, length)
+     int fd;
+     off64_t length;
+{
+  if (! have_no_truncate64)
+    {
+      unsigned int low = length & 0xffffffff;
+      unsigned int high = length >> 32;
+      int saved_errno = errno;
+
+      int result = INLINE_SYSCALL (ftruncate64, 3, fd, low, high);
+
+      if (result != -1 || errno != ENOSYS)
+       return result;
+
+      __set_errno (saved_errno);
+      have_no_truncate64 = 1;
+    }
+
+  if ((off_t) length != length)
+    {
+      __set_errno (EINVAL);
+      return -1;
+    }
+  return __ftruncate (fd, (off_t) length);
+}
+
+#else
+/* Use the generic implementation.  */
+# include <sysdeps/generic/ftruncate64.c>
+#endif