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glibc  2.9
sendfile.c
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00001 /* sendfile -- copy data directly from one file descriptor to another
00002    Copyright (C) 2002 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/sendfile.h>
00021 #include <stddef.h>
00022 
00023 /* Send COUNT bytes from file associated with IN_FD starting at OFFSET to
00024    descriptor OUT_FD.  */
00025 ssize_t
00026 sendfile (int out_fd, int in_fd, off_t *offset, size_t count)
00027 {
00028   if (offset == NULL || sizeof (off_t) == sizeof (off64_t))
00029     return sendfile64 (out_fd, in_fd, (off64_t *) offset, count);
00030   else
00031     {
00032       off64_t ofs = *offset;
00033       ssize_t ret = sendfile64 (out_fd, in_fd, &ofs, count);
00034       *offset = ofs;
00035       return ret;
00036     }
00037 }