Initial revision

sysdeps/unix/sysv/sysv4/ftruncate.c

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+/* ftruncate for SVR4 using the fcntl F_FREESP command.
+Copyright (C) 1995 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., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+
+/* Truncate the file FD refers to to LENGTH bytes.  */
+int
+DEFUN(ftruncate, (fd, length),
+      int fd AND off_t length)
+{
+  struct flock fl;
+
+  memset (&fl, 0, sizeof fl);
+  fl.l_type = F_WRLCK;
+  fl.l_start = length;
+  return fcntl (fd, F_FREESP, &fl);
+}