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/*
ISC License
Copyright (c) 2018, Antonio SJ Musumeci <trapexit@spawn.link>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#include "errno.hpp"
#include <cstdint>
#include <fcntl.h>
#include <stdio.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>
namespace l
{
static
int64_t
copy_file_range_(int src_fd_,
int64_t *src_off_,
int tgt_fd_,
int64_t *tgt_off_,
const uint64_t len_,
const unsigned int flags_)
{
#ifdef SYS_copy_file_range
int64_t rv;
loff_t src_off;
loff_t tgt_off;
loff_t *src_off_ptr;
loff_t *tgt_off_ptr;
src_off = ((src_off_ == NULL) ? 0 : *src_off_);
tgt_off = ((tgt_off_ == NULL) ? 0 : *tgt_off_);
src_off_ptr = ((src_off_ == NULL) ? NULL : &src_off);
tgt_off_ptr = ((tgt_off_ == NULL) ? NULL : &tgt_off);
rv = ::syscall(SYS_copy_file_range,
src_fd_,
src_off_ptr,
tgt_fd_,
tgt_off_ptr,
len_,
flags_);
if(rv != -1)
{
if(src_off_ != NULL)
*src_off_ = src_off;
if(tgt_off_ != NULL)
*tgt_off_ = tgt_off;
}
return rv;
#else
return (errno=EOPNOTSUPP,-1);
#endif
}
}
namespace fs
{
int64_t
copy_file_range(const int src_fd_,
int64_t *src_off_,
const int tgt_fd_,
int64_t *tgt_off_,
const uint64_t len_,
const unsigned int flags_)
{
return l::copy_file_range_(src_fd_,
src_off_,
tgt_fd_,
tgt_off_,
len_,
flags_);
}
}