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/* sendfile -- copy data directly from one file descriptor to another
Copyright (C) 2002-2020 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <sys/sendfile.h>
#include <stddef.h>
/* Send COUNT bytes from file associated with IN_FD starting at OFFSET to
descriptor OUT_FD. */
ssize_t
sendfile (int out_fd, int in_fd, off_t *offset, size_t count)
{
if (offset == NULL || sizeof (off_t) == sizeof (off64_t))
return __sendfile64 (out_fd, in_fd, (off64_t *) offset, count);
else
{
off64_t ofs = *offset;
ssize_t ret = __sendfile64 (out_fd, in_fd, &ofs, count);
*offset = ofs;
return ret;
}
}
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