44 lines
1.6 KiB
C
44 lines
1.6 KiB
C
/* Copy a file from one path to another.
|
|
Copyright (C) 2020-2022 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 <fcntl.h>
|
|
#include <support/check.h>
|
|
#include <support/support.h>
|
|
#include <support/xunistd.h>
|
|
|
|
void
|
|
support_copy_file (const char *from, const char *to)
|
|
{
|
|
struct stat64 st;
|
|
xstat (from, &st);
|
|
int fd_from = xopen (from, O_RDONLY, 0);
|
|
mode_t mode = st.st_mode & 0777;
|
|
int fd_to = xopen (to, O_WRONLY | O_TRUNC | O_CREAT, mode);
|
|
ssize_t ret = support_copy_file_range (fd_from, NULL, fd_to, NULL,
|
|
st.st_size, 0);
|
|
if (ret < 0)
|
|
FAIL_EXIT1 ("copying from \"%s\" to \"%s\": %m", from, to);
|
|
if (ret != st.st_size)
|
|
FAIL_EXIT1 ("copying from \"%s\" to \"%s\": only %zd of %llu bytes copied",
|
|
from, to, ret, (unsigned long long int) st.st_size);
|
|
if (fchmod (fd_to, mode) < 0)
|
|
FAIL_EXIT1 ("fchmod on %s to 0%o: %m", to, mode);
|
|
xclose (fd_to);
|
|
xclose (fd_from);
|
|
}
|