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486a81f387
The copy_file_range syscall (introduced in Linux kernel version 4.5) can copy files more efficiently via server-side copy etc. * admin/merge-gnulib (GNULIB_MODULES): Add copy-file-range. * lib/copy-file-range.c, m4/copy-file-range.m4: New files, copied from Gnulib. * lib/gnulib.mk.in, m4/gnulib-comp.m4: Regenerate. * src/fileio.c (Fcopy_file): Try copy_file_range first, falling back on read+write only if copy_file_range failed or if the input is empty and so could be a /proc file.
34 lines
1.1 KiB
C
34 lines
1.1 KiB
C
/* Stub for copy_file_range
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Copyright 2019 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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#include <unistd.h>
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#include <errno.h>
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ssize_t
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copy_file_range (int infd, off_t *pinoff,
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int outfd, off_t *poutoff,
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size_t length, unsigned int flags)
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{
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/* There is little need to emulate copy_file_range with read+write,
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since programs that use copy_file_range must fall back on
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read+write anyway. */
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errno = ENOSYS;
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return -1;
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}
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