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44 lines
1.6 KiB
C
44 lines
1.6 KiB
C
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/* Copy a file from one path to another.
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Copyright (C) 2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <fcntl.h>
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#include <support/check.h>
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#include <support/support.h>
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#include <support/xunistd.h>
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void
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support_copy_file (const char *from, const char *to)
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{
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struct stat64 st;
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xstat (from, &st);
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int fd_from = xopen (from, O_RDONLY, 0);
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mode_t mode = st.st_mode & 0777;
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int fd_to = xopen (to, O_WRONLY | O_TRUNC | O_CREAT, mode);
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ssize_t ret = support_copy_file_range (fd_from, NULL, fd_to, NULL,
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st.st_size, 0);
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if (ret < 0)
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FAIL_EXIT1 ("copying from \"%s\" to \"%s\": %m", from, to);
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if (ret != st.st_size)
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FAIL_EXIT1 ("copying from \"%s\" to \"%s\": only %zd of %llu bytes copied",
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from, to, ret, (unsigned long long int) st.st_size);
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if (fchmod (fd_to, mode) < 0)
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FAIL_EXIT1 ("fchmod on %s to 0%o: %m", to, mode);
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xclose (fd_to);
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xclose (fd_from);
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}
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