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glibc  2.9
ftruncate.c
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00001 /* ftruncate for SVR4 using the fcntl F_FREESP command.
00002    Copyright (C) 1995, 1997 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <sys/types.h>
00021 #include <unistd.h>
00022 #include <fcntl.h>
00023 #include <string.h>
00024 
00025 /* Truncate the file FD refers to to LENGTH bytes.  */
00026 int
00027 ftruncate (fd, length)
00028      int fd;
00029      off_t length;
00030 {
00031   struct flock fl;
00032 
00033   memset (&fl, 0, sizeof fl);
00034   fl.l_type = F_WRLCK;
00035   fl.l_start = length;
00036   return fcntl (fd, F_FREESP, &fl);
00037 }