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On 05/12/2017 12:03, Florian Weimer wrote:
> The attached version of the patch fixes a few 32-bit issues in the code (non-64 functions being called, and size_t-to-off64_t conversion issue). I renamed the -common.c file into -compat.c, for consistency with how the file is used.
>
> It also drops the zero-as-ENOSPC special case Andreas recognized as unnecessary.
>
> Thanks,
> Florian
>
> copy_file_range.patch
>
>
> Subject: [PATCH] copy_file_range: New function to copy file data
> To: libc-alpha@sourceware.org
>
> The semantics are based on the Linux system call, but a very close
> emulation in user space is provided.
>
> 2017-12-05 Florian Weimer <fweimer@redhat.com>
>
> * io/Makefile (routines): Add copy_file_range.
> (tests): Add tst-copy_file_range.
> (tests-static, tests-internal): Add tst-copy_file_range-compat.
> * io/Versions (GLIBC_2.27): Export copy_file_range.
> * io/copy_file_range-compat.c: New file.
> * io/copy_file_range.c: Likewise.
> * io/tst-copy_file_range-compat.c: Likewise.
> * io/tst-copy_file_range.c: Likewise.
> * manual/llio.texi (Copying File Data): New section.
> * posix/unistd.h [__USE_GNU] (copy_file_range): Declare.
> * support/Makefile (libsupport-routines): Add support-xfstat,
> xftruncate, xlseek.
> * support/support-xfstat.c: New file.
> * support/xftruncate.c: Likewise.
> * support/xlseek.c: Likewise.
> * support/xunistd.h (xfstat, xftruncate, xlseek): Declare.
> * sysdeps/unix/sysv/linux/**.abilist: Update.
> * sysdeps/unix/sysv/linux/copy_file_range.c: New file.
I am seeing a lot of failures from tst-copy_file_range on both x86_64 and i686
when using the fallback implementation (io/copy_file_range.c) due the fact
write is returning EFBIG (I attached the test output):
[...]
openat(AT_FDCWD, "/tmp/tst-copy_file_range-in-mT9I6j", O_RDWR) = 3
ftruncate(3, 0) = 0
openat(AT_FDCWD, "/tmp/tst-copy_file_range-out-0RbGw2", O_RDWR) = 4
ftruncate(4, 0)
[...]
fcntl(4, F_GETFL) = 0x8002 (flags O_RDWR|O_LARGEFILE)
read(3, "k2dft\31*b#F=P.AyuQ[\22M\2\37\21f\0243\20\r\177\33Ak"..., 8192) = 8192
write(4, "k2dft\31*b#F=P.AyuQ[\22M\2\37\21f\0243\20\r\177\33Ak"..., 8192) = -1 EFBIG (File too large)
lseek(3, -8192, SEEK_CUR) = 0
write(1, "tst-copy_file_range.c:285: numer"..., 54tst-copy_file_range.c:285: numeric comparison failure
[...]
Since the documentation does not explicit state this possible issue I think
we need to either remap this to another error code or document this possible
failure. I would say to update the documentation with EFBIG, since the syscall
also returns the same errno in this case.
I also noted it does not provided a non-LFS version and it a good way forward
imho, however I think we need to explicit handle the case where a non-LFS
invocation tries to use copy_file_range in a non-supported way. For instance
the snippet:
[...]
int fin = open ("/tmp/file.in", O_RDWR | O_CREAT | O_TRUNC, 0600); int fout = open ("/tmp/file.out", O_RDWR | O_CREAT | O_TRUNC, 0600); char buffer[8192] = { 0xcc }; const size_t size = 8192; pwrite (fin, buffer, size, 0); copy_file_range (fin, 0, fout, &(__off64_t) { INT32_MAX }, size, 0);
[...]
Will again return EFBIG. We have some options as 1. handle EFBIG
as an expected retuned error, 2. do not declare copy_file_range for
!__USE_FILE_OFFSET64, 3. add a dummy implementation for non-LFS
(which return ENOSYS).
>
> diff --git a/io/Makefile b/io/Makefile
> index 2f26bf56db..f2f0f0d040 100644
> --- a/io/Makefile
> +++ b/io/Makefile
> @@ -52,7 +52,7 @@ routines := \
> ftw ftw64 fts fts64 poll ppoll \
> posix_fadvise posix_fadvise64 \
> posix_fallocate posix_fallocate64 \
> - sendfile sendfile64 \
> + sendfile sendfile64 copy_file_range \
> utimensat futimens
>
> # These routines will be omitted from the libc shared object.
> @@ -70,7 +70,13 @@ tests := test-utime test-stat test-stat2 test-lfs tst-getcwd \
> tst-symlinkat tst-linkat tst-readlinkat tst-mkdirat \
> tst-mknodat tst-mkfifoat tst-ttyname_r bug-ftw5 \
> tst-posix_fallocate tst-posix_fallocate64 \
> - tst-fts tst-fts-lfs tst-open-tmpfile
> + tst-fts tst-fts-lfs tst-open-tmpfile \
> + tst-copy_file_range \
> +
> +# This test includes the compat implementation of copy_file_range,
> +# which uses internal, unexported libc functions.
> +tests-static += tst-copy_file_range-compat
> +tests-internal += tst-copy_file_range-compat
>
> ifeq ($(run-built-tests),yes)
> tests-special += $(objpfx)ftwtest.out
Ok.
> diff --git a/io/Versions b/io/Versions
> index 64316cd025..98898cb9d5 100644
> --- a/io/Versions
> +++ b/io/Versions
> @@ -125,4 +125,7 @@ libc {
> GLIBC_2.23 {
> fts64_children; fts64_close; fts64_open; fts64_read; fts64_set;
> }
> + GLIBC_2.27 {
> + copy_file_range;
> + }
> }
Ok.
> diff --git a/io/copy_file_range-compat.c b/io/copy_file_range-compat.c
> new file mode 100644
> index 0000000000..ba6ea389df
> --- /dev/null
> +++ b/io/copy_file_range-compat.c
> @@ -0,0 +1,158 @@
> +/* Emulation of copy_file_range.
> + Copyright (C) 2017 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
> + <http://www.gnu.org/licenses/>. */
> +
> +/* The following macros should be defined before including this
> + file:
> +
> + COPY_FILE_RANGE_DECL Declaration specifiers for the function below.
> + COPY_FILE_RANGE Name of the function to define. */
> +
> +#include <errno.h>
> +#include <fcntl.h>
> +#include <inttypes.h>
> +#include <limits.h>
> +#include <sys/stat.h>
> +#include <sys/types.h>
> +#include <unistd.h>
> +
> +COPY_FILE_RANGE_DECL
> +ssize_t
> +COPY_FILE_RANGE (int infd, __off64_t *pinoff,
> + int outfd, __off64_t *poutoff,
> + size_t length, unsigned int flags)
> +{
> + if (flags != 0)
> + {
> + __set_errno (EINVAL);
> + return -1;
> + }
> +
> + struct stat64 instat;
> + struct stat64 outstat;
> + if (fstat64 (infd, &instat) != 0 || fstat64 (outfd, &outstat) != 0)
> + return -1;
> + if (S_ISDIR (instat.st_mode) || S_ISDIR (outstat.st_mode))
> + {
> + __set_errno (EISDIR);
> + return -1;
> + }
> + if (!S_ISREG (instat.st_mode) || !S_ISREG (outstat.st_mode))
> + {
> + /* We need a regular input file so that the we can seek
> + backwards in case of a write failure. */
> + __set_errno (EINVAL);
> + return -1;
> + }
> + if (instat.st_dev != outstat.st_dev)
> + {
> + /* Cross-device copies are not supported. */
> + __set_errno (EXDEV);
> + return -1;
> + }
> +
> + /* The output descriptor must not have O_APPEND set. */
> + {
> + int flags = __fcntl (outfd, F_GETFL);
> + if (flags & O_APPEND)
> + {
> + __set_errno (EBADF);
> + return -1;
> + }
> + }
> +
> + /* Avoid an overflow in the result. */
> + if (length > SSIZE_MAX)
> + length = SSIZE_MAX;
> +
> + /* Main copying loop. The buffer size is arbitrary and is a
> + trade-off between stack size consumption, cache usage, and
> + amortization of system call overhead. */
> + size_t copied = 0;
> + char buf[8192];
Do we you have any numbers with shorter sizes? Maybe
> + while (length > 0)
> + {
> + size_t to_read = length;
> + if (to_read > sizeof (buf))
> + to_read = sizeof (buf);
> +
> + /* Fill the buffer. */
> + ssize_t read_count;
> + if (pinoff == NULL)
> + read_count = read (infd, buf, to_read);
> + else
> + read_count = __libc_pread64 (infd, buf, to_read, *pinoff);
> + if (read_count == 0)
> + /* End of file reached prematurely. */
> + return copied;
> + if (read_count < 0)
> + {
> + if (copied > 0)
> + /* Report the number of bytes copied so far. */
> + return copied;
> + return -1;
> + }
> + if (pinoff != 0)
> + *pinoff += read_count;
> +
> + /* Write the buffer part which was read to the destination. */
> + char *end = buf + read_count;
> + for (char *p = buf; p < end; )
> + {
> + ssize_t write_count;
> + if (poutoff == NULL)
> + write_count = write (outfd, p, end - p);
> + else
> + write_count = __libc_pwrite64 (outfd, p, end - p, *poutoff);
> + if (write_count < 0)
> + {
> + /* Adjust the input read position to match what we have
> + written, so that the caller can pick up after the
> + error. */
> + size_t written = p - buf;
> + /* NB: This needs to be signed so that we can form the
> + negative value below. */
> + ssize_t overread = read_count - written;
> + if (pinoff == NULL)
> + {
> + if (overread > 0)
> + {
> + /* We are on an error recovery path, so we
> + cannot deal with failure here. */
> + int save_errno = errno;
> + (void) __libc_lseek64 (infd, -overread, SEEK_CUR);
> + __set_errno (save_errno);
> + }
> + }
> + else /* pinoff != NULL */
> + *pinoff -= overread;
> +
> + if (copied > 0)
> + /* Report the number of bytes copied so far. */
> + return copied + written;
> + return -1;
> + }
> + p += write_count;
> + if (poutoff != NULL)
> + *poutoff += write_count;
> + } /* Write loop. */
> +
> + copied += read_count;
> + length -= read_count;
> + }
> + return copied;
> +}
Ok.
> diff --git a/io/copy_file_range.c b/io/copy_file_range.c
> new file mode 100644
> index 0000000000..61ee6871b4
> --- /dev/null
> +++ b/io/copy_file_range.c
> @@ -0,0 +1,22 @@
> +/* Generic implementation of copy_file_range.
> + Copyright (C) 2017 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
> + <http://www.gnu.org/licenses/>. */
> +
> +#define COPY_FILE_RANGE_DECL
> +#define COPY_FILE_RANGE copy_file_range
> +
> +#include <io/copy_file_range-compat.c>
Ok.
> diff --git a/io/tst-copy_file_range-compat.c b/io/tst-copy_file_range-compat.c
> new file mode 100644
> index 0000000000..eb737946d9
> --- /dev/null
> +++ b/io/tst-copy_file_range-compat.c
> @@ -0,0 +1,30 @@
> +/* Test the fallback implementation of copy_file_range.
> + Copyright (C) 2017 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
> + <http://www.gnu.org/licenses/>. */
> +
> +/* Get the declaration of the official copy_of_range function. */
> +#include <unistd.h>
> +
> +/* Compile a local version of copy_file_range. */
> +#define COPY_FILE_RANGE_DECL static
> +#define COPY_FILE_RANGE copy_file_range_compat
> +#include <io/copy_file_range-compat.c>
> +
> +/* Re-use the test, but run it against copy_file_range_compat defined
> + above. */
> +#define copy_file_range copy_file_range_compat
> +#include "tst-copy_file_range.c"
> diff --git a/io/tst-copy_file_range.c b/io/tst-copy_file_range.c
> new file mode 100644
> index 0000000000..d7532f288a
> --- /dev/null
> +++ b/io/tst-copy_file_range.c
> @@ -0,0 +1,730 @@
> +/* Tests for copy_file_range.
> + Copyright (C) 2017 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
> + <http://www.gnu.org/licenses/>. */
> +
> +#include <array_length.h>
> +#include <errno.h>
> +#include <fcntl.h>
> +#include <inttypes.h>
> +#include <libgen.h>
> +#include <poll.h>
> +#include <sched.h>
> +#include <stdbool.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <support/check.h>
> +#include <support/namespace.h>
> +#include <support/support.h>
> +#include <support/temp_file.h>
> +#include <support/test-driver.h>
> +#include <support/xunistd.h>
> +#include <sys/mount.h>
> +
> +/* Boolean flags which indicate whether to use pointers with explicit
> + output flags. */
> +static int do_inoff;
> +static int do_outoff;
> +
> +/* Name and descriptors of the input files. Files are truncated and
> + reopened (with O_RDWR) between tests. */
> +static char *infile;
> +static int infd;
> +static char *outfile;
> +static int outfd;
> +
> +/* Like the above, but on a different file system. xdevfile can be
> + NULL if no suitable file system has been found. */
> +static char *xdevfile;
> +
> +/* Input and output offsets. Set according to do_inoff and do_outoff
> + before the test. The offsets themselves are always set to
> + zero. */
> +static off64_t inoff;
> +static off64_t *pinoff;
> +static off64_t outoff;
> +static off64_t *poutoff;
> +
> +/* These are a collection of copy sizes used in tests. The selection
> + takes into account that the fallback implementation uses an
> + internal buffer of 8192 bytes. */
> +enum { maximum_size = 99999 };
> +static const int typical_sizes[] =
> + { 0, 1, 2, 3, 1024, 2048, 4096, 8191, 8192, 8193, 16383, 16384, 16385,
> + maximum_size };
> +
> +/* The random contents of this array can be used as a pattern to check
> + for correct write operations. */
> +static unsigned char random_data[maximum_size];
> +
> +/* The size chosen by the test harness. */
> +static int current_size;
> +
> +/* Discover the maximum file size (writable offset) for outfd.
> + Truncate outfd to length zero as a side effect. */
> +static off64_t
> +find_maximum_offset (void)
> +{
> + xftruncate (outfd, 0);
> + static off64_t cache = 0;
> + if (cache != 0)
> + return cache;
> +
> + uint64_t upper = -1;
> + upper >>= 1; /* Maximum of off64_t. */
> + TEST_VERIFY ((off64_t) upper > 0);
> + TEST_VERIFY ((off64_t) (upper + 1) < 0);
> + if (lseek64 (outfd, upper, SEEK_SET) >= 0)
> + {
> + if (write (outfd, "", 1) == 1)
> + FAIL_EXIT1 ("created a file larger than the off64_t range");
> + }
> +
> + uint64_t lower = 1024 * 1024; /* A reasonable minimum file size. */
> + /* Loop invariant: writing at lower succeeds, writing at upper fails. */
> + while (lower + 1 < upper)
> + {
> + uint64_t middle = (lower + upper) / 2;
> + if (test_verbose > 0)
> + printf ("info: %s: remaining test range %" PRIu64 " .. %" PRIu64
> + ", probe at %" PRIu64 "\n", __func__, lower, upper, middle);
> + xftruncate (outfd, 0);
> + if (lseek64 (outfd, middle, SEEK_SET) >= 0
> + && write (outfd, "", 1) == 1)
> + lower = middle;
> + else
> + upper = middle;
> + }
> + TEST_VERIFY (lower + 1 == upper);
> + xftruncate (outfd, 0);
> + cache = lower;
> + printf ("info: maximum writable file offset: %" PRIu64 " (%" PRIx64 ")\n",
> + lower, lower);
> + return lower;
> +}
> +
> +/* Perform a copy of a file. */
> +static void
> +simple_file_copy (void)
> +{
> + xwrite (infd, random_data, current_size);
> +
> + int length;
> + int in_skipped; /* Expected skipped bytes in input. */
> + if (do_inoff)
> + {
> + xlseek (infd, 1, SEEK_SET);
> + inoff = 2;
> + length = current_size - 3;
> + in_skipped = 2;
> + }
> + else
> + {
> + xlseek (infd, 3, SEEK_SET);
> + length = current_size - 5;
> + in_skipped = 3;
> + }
> + int out_skipped; /* Expected skipped bytes before the written data. */
> + if (do_outoff)
> + {
> + xlseek (outfd, 4, SEEK_SET);
> + outoff = 5;
> + out_skipped = 5;
> + }
> + else
> + {
> + xlseek (outfd, 6, SEEK_SET);
> + length = current_size - 6;
> + out_skipped = 6;
> + }
> + if (length < 0)
> + length = 0;
> +
> + TEST_COMPARE (copy_file_range (infd, pinoff, outfd, poutoff,
> + length, 0), length);
> + if (do_inoff)
> + {
> + TEST_COMPARE (inoff, 2 + length);
> + TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 1);
> + }
> + else
> + TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 3 + length);
> + if (do_outoff)
> + {
> + TEST_COMPARE (outoff, 5 + length);
> + TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), 4);
> + }
> + else
> + TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), 6 + length);
> +
> + struct stat64 st;
> + xfstat (outfd, &st);
> + if (length > 0)
> + TEST_COMPARE (st.st_size, out_skipped + length);
> + else
> + {
> + /* If we did not write anything, we also did not add any
> + padding. */
> + TEST_COMPARE (st.st_size, 0);
> + return;
> + }
> +
> + xlseek (outfd, 0, SEEK_SET);
> + char *bytes = xmalloc (st.st_size);
> + TEST_COMPARE (read (outfd, bytes, st.st_size), st.st_size);
> + for (int i = 0; i < out_skipped; ++i)
> + TEST_COMPARE (bytes[i], 0);
> + TEST_VERIFY (memcmp (bytes + out_skipped, random_data + in_skipped,
> + length) == 0);
> + free (bytes);
> +}
> +
> +/* Test that reading from a pipe willfails. */
> +static void
> +pipe_as_source (void)
> +{
> + int pipefds[2];
> + xpipe (pipefds);
> +
> + for (int length = 0; length < 2; ++length)
> + {
> + if (test_verbose > 0)
> + printf ("info: %s: length=%d\n", __func__, length);
> +
> + /* Make sure that there is something to copy in the pipe. */
> + xwrite (pipefds[1], "@", 1);
> +
> + TEST_COMPARE (copy_file_range (pipefds[0], pinoff, outfd, poutoff,
> + length, 0), -1);
> + /* Linux 4.10 and later return EINVAL. Older kernels return
> + EXDEV. */
> + TEST_VERIFY (errno == EINVAL || errno == EXDEV);
> + TEST_COMPARE (inoff, 0);
> + TEST_COMPARE (outoff, 0);
> + TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), 0);
> +
> + /* Make sure that nothing was read. */
> + char buf = 'A';
> + TEST_COMPARE (read (pipefds[0], &buf, 1), 1);
> + TEST_COMPARE (buf, '@');
> + }
> +
> + xclose (pipefds[0]);
> + xclose (pipefds[1]);
> +}
> +
> +/* Test that writing to a pipe fails. */
> +static void
> +pipe_as_destination (void)
> +{
> + /* Make sure that there is something to read in the input file. */
> + xwrite (infd, "abc", 3);
> + xlseek (infd, 0, SEEK_SET);
> +
> + int pipefds[2];
> + xpipe (pipefds);
> +
> + for (int length = 0; length < 2; ++length)
> + {
> + if (test_verbose > 0)
> + printf ("info: %s: length=%d\n", __func__, length);
> +
> + TEST_COMPARE (copy_file_range (infd, pinoff, pipefds[1], poutoff,
> + length, 0), -1);
> + /* Linux 4.10 and later return EINVAL. Older kernels return
> + EXDEV. */
> + TEST_VERIFY (errno == EINVAL || errno == EXDEV);
> + TEST_COMPARE (inoff, 0);
> + TEST_COMPARE (outoff, 0);
> + TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 0);
> +
> + /* Make sure that nothing was written. */
> + struct pollfd pollfd = { .fd = pipefds[0], .events = POLLIN, };
> + TEST_COMPARE (poll (&pollfd, 1, 0), 0);
> + }
> +
> + xclose (pipefds[0]);
> + xclose (pipefds[1]);
> +}
> +
> +/* Test a write failure after (potentially) writing some bytes. */
> +static void
> +delayed_write_failure (void)
> +{
> + /* We need to write something to provoke the error. */
> + if (current_size == 0)
> + return;
> + xwrite (infd, random_data, sizeof (random_data));
> + xlseek (infd, 0, SEEK_SET);
> +
> + /* Write failure near the start. */
> + off64_t where = find_maximum_offset ();
> + if (current_size == 1)
> + ++where;
> + outoff = where;
> + if (do_outoff)
> + xlseek (outfd, 1, SEEK_SET);
> + else
> + xlseek (outfd, where, SEEK_SET);
> + TEST_COMPARE (copy_file_range (infd, pinoff, outfd, poutoff,
> + sizeof (random_data), 0), -1);
> + TEST_COMPARE (errno, EINVAL);
> + TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 0);
> + if (do_outoff)
> + TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), 1);
> + else
> + TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), where);
> + TEST_COMPARE (outoff, where);
> + struct stat64 st;
> + xfstat (outfd, &st);
> + TEST_COMPARE (st.st_size, 0);
> +
> + /* Write failure near the end. */
> + if (current_size == 1)
> + /* This would be same as the first test because there is only one
> + byte. */
> + return;
> + where = find_maximum_offset () - current_size + 1;
> + if (current_size == sizeof (random_data))
> + /* Otherwise we do not reach the non-writable byte. */
> + ++where;
> + outoff = where;
> + if (do_outoff)
> + xlseek (outfd, 1, SEEK_SET);
> + else
> + xlseek (outfd, where, SEEK_SET);
> + ssize_t ret = copy_file_range (infd, pinoff, outfd, poutoff,
> + sizeof (random_data), 0);
> + if (ret < 0)
> + {
> + TEST_COMPARE (ret, -1);
> + TEST_COMPARE (errno, EINVAL);
> + xfstat (outfd, &st);
> + TEST_COMPARE (st.st_size, 0);
> + }
> + else
> + {
> + /* The first copy succeeded. This happens in the emulation
> + because the internal buffer of limited size does not
> + necessarily cross the off64_t boundary on the first write
> + operation. */
> + if (test_verbose > 0)
> + printf ("info: copy_file_range (%zu) returned %zd\n",
> + sizeof (random_data), ret);
> + TEST_VERIFY (ret > 0);
> + TEST_VERIFY (ret < maximum_size);
> + xfstat (outfd, &st);
> + TEST_COMPARE (st.st_size, where + ret);
> + if (do_inoff)
> + {
> + TEST_COMPARE (inoff, ret);
> + TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 0);
> + }
> + else
> + TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), ret);
> +
> + char *buffer = xmalloc (ret);
> + TEST_COMPARE (pread64 (outfd, buffer, ret, where), ret);
> + TEST_VERIFY (memcmp (buffer, random_data, ret) == 0);
> + free (buffer);
> +
> + /* The second copy fails. */
> + TEST_COMPARE (copy_file_range (infd, pinoff, outfd, poutoff,
> + sizeof (random_data), 0), -1);
> + TEST_COMPARE (errno, EINVAL);
> + }
> +}
> +
> +/* Test a write failure across devices. */
> +static void
> +cross_device_failure (void)
> +{
> + if (xdevfile == NULL)
> + /* Subtest not supported due to missing cross-device file. */
> + return;
> +
> + /* We need something to write. */
> + xwrite (infd, random_data, sizeof (random_data));
> + xlseek (infd, 0, SEEK_SET);
> +
> + int xdevfd = xopen (xdevfile, O_RDWR | O_LARGEFILE, 0);
> + TEST_COMPARE (copy_file_range (infd, pinoff, xdevfd, poutoff,
> + current_size, 0), -1);
> + TEST_COMPARE (errno, EXDEV);
> + TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 0);
> + struct stat64 st;
> + xfstat (xdevfd, &st);
> + TEST_COMPARE (st.st_size, 0);
> +
> + xclose (xdevfd);
> +}
> +
> +/* Try to exercise ENOSPC behavior with a tempfs file system (so that
> + we do not have to fill up a regular file system to get the error).
> + This function runs in a subprocess, so that we do not change the
> + mount namespace of the actual test process. */
> +static void
> +enospc_failure_1 (void *closure)
> +{
> +#ifdef CLONE_NEWNS
> + support_become_root ();
> +
> + /* Make sure that we do not alter the file system mounts of the
> + parents. */
> + if (! support_enter_mount_namespace ())
> + {
> + printf ("warning: ENOSPC test skipped\n");
> + return;
> + }
> +
> + char *mountpoint = closure;
> + if (mount ("none", mountpoint, "tmpfs", MS_NODEV | MS_NOEXEC,
> + "size=500k") != 0)
> + {
> + printf ("warning: could not mount tmpfs at %s: %m\n", mountpoint);
> + return;
> + }
> +
> + /* The source file must reside on the same file system. */
> + char *intmpfsfile = xasprintf ("%s/%s", mountpoint, "in");
> + int intmpfsfd = xopen (intmpfsfile, O_RDWR | O_CREAT | O_LARGEFILE, 0600);
> + xwrite (intmpfsfd, random_data, sizeof (random_data));
> + xlseek (intmpfsfd, 1, SEEK_SET);
> + inoff = 1;
> +
> + char *outtmpfsfile = xasprintf ("%s/%s", mountpoint, "out");
> + int outtmpfsfd = xopen (outtmpfsfile, O_RDWR | O_CREAT | O_LARGEFILE, 0600);
> +
> + /* Fill the file with data until ENOSPC is reached. */
> + while (true)
> + {
> + ssize_t ret = write (outtmpfsfd, random_data, sizeof (random_data));
> + if (ret < 0 && errno != ENOSPC)
> + FAIL_EXIT1 ("write to %s: %m", outtmpfsfile);
> + if (ret < sizeof (random_data))
> + break;
> + }
> + TEST_COMPARE (write (outtmpfsfd, "", 1), -1);
> + TEST_COMPARE (errno, ENOSPC);
> + off64_t maxsize = xlseek (outtmpfsfd, 0, SEEK_CUR);
> + TEST_VERIFY_EXIT (maxsize > sizeof (random_data));
> +
> + /* Constructed the expected file contents. */
> + char *expected = xmalloc (maxsize);
> + TEST_COMPARE (pread64 (outtmpfsfd, expected, maxsize, 0), maxsize);
> + /* Go back a little, so some bytes can be written. */
> + enum { offset = 20000 };
> + TEST_VERIFY_EXIT (offset < maxsize);
> + TEST_VERIFY_EXIT (offset < sizeof (random_data));
> + memcpy (expected + maxsize - offset, random_data + 1, offset);
> +
> + if (do_outoff)
> + {
> + outoff = maxsize - offset;
> + xlseek (outtmpfsfd, 2, SEEK_SET);
> + }
> + else
> + xlseek (outtmpfsfd, -offset, SEEK_CUR);
> +
> + /* First call is expected to succeed because we made room for some
> + bytes. */
> + TEST_COMPARE (copy_file_range (intmpfsfd, pinoff, outtmpfsfd, poutoff,
> + maximum_size, 0), offset);
> + if (do_inoff)
> + {
> + TEST_COMPARE (inoff, 1 + offset);
> + TEST_COMPARE (xlseek (intmpfsfd, 0, SEEK_CUR), 1);
> + }
> + else
> + TEST_COMPARE (xlseek (intmpfsfd, 0, SEEK_CUR), 1 + offset);
> + if (do_outoff)
> + {
> + TEST_COMPARE (outoff, maxsize);
> + TEST_COMPARE (xlseek (outtmpfsfd, 0, SEEK_CUR), 2);
> + }
> + else
> + TEST_COMPARE (xlseek (outtmpfsfd, 0, SEEK_CUR), maxsize);
> + struct stat64 st;
> + xfstat (outtmpfsfd, &st);
> + TEST_COMPARE (st.st_size, maxsize);
> + char *actual = xmalloc (st.st_size);
> + TEST_COMPARE (pread64 (outtmpfsfd, actual, st.st_size, 0), st.st_size);
> + TEST_VERIFY (memcmp (expected, actual, maxsize) == 0);
> +
> + /* Second call should fail with ENOSPC. */
> + TEST_COMPARE (copy_file_range (intmpfsfd, pinoff, outtmpfsfd, poutoff,
> + maximum_size, 0), -1);
> + TEST_COMPARE (errno, ENOSPC);
> +
> + /* Offsets should be unchanged. */
> + if (do_inoff)
> + {
> + TEST_COMPARE (inoff, 1 + offset);
> + TEST_COMPARE (xlseek (intmpfsfd, 0, SEEK_CUR), 1);
> + }
> + else
> + TEST_COMPARE (xlseek (intmpfsfd, 0, SEEK_CUR), 1 + offset);
> + if (do_outoff)
> + {
> + TEST_COMPARE (outoff, maxsize);
> + TEST_COMPARE (xlseek (outtmpfsfd, 0, SEEK_CUR), 2);
> + }
> + else
> + TEST_COMPARE (xlseek (outtmpfsfd, 0, SEEK_CUR), maxsize);
> + TEST_COMPARE (xlseek (outtmpfsfd, 0, SEEK_END), maxsize);
> + TEST_COMPARE (pread64 (outtmpfsfd, actual, maxsize, 0), maxsize);
> + TEST_VERIFY (memcmp (expected, actual, maxsize) == 0);
> +
> + free (actual);
> + free (expected);
> +
> + xclose (intmpfsfd);
> + xclose (outtmpfsfd);
> + free (intmpfsfile);
> + free (outtmpfsfile);
> +
> +#else /* !CLONE_NEWNS */
> + puts ("warning: ENOSPC test skipped (no mount namespaces)");
> +#endif
> +}
> +
> +/* Call enospc_failure_1 in a subprocess. */
> +static void
> +enospc_failure (void)
> +{
> + char *mountpoint
> + = support_create_temp_directory ("tst-copy_file_range-enospc-");
> + support_isolate_in_subprocess (enospc_failure_1, mountpoint);
> + free (mountpoint);
> +}
> +
> +/* The target file descriptor must have O_APPEND enabled. */
> +static void
> +oappend_failure (void)
> +{
> + /* Add data, to make sure we do not fail because there is
> + insufficient input data. */
> + xwrite (infd, random_data, current_size);
> + xlseek (infd, 0, SEEK_SET);
> +
> + xclose (outfd);
> + outfd = xopen (outfile, O_RDWR | O_APPEND, 0);
> + TEST_COMPARE (copy_file_range (infd, pinoff, outfd, poutoff,
> + current_size, 0), -1);
> + TEST_COMPARE (errno, EBADF);
> +}
> +
> +/* Test that a short input file results in a shortened copy. */
> +static void
> +short_copy (void)
> +{
> + if (current_size == 0)
> + /* Nothing to shorten. */
> + return;
> +
> + /* Two subtests, one with offset 0 and current_size - 1 bytes, and
> + another one with current_size bytes, but offset 1. */
> + for (int shift = 0; shift < 2; ++shift)
> + {
> + if (test_verbose > 0)
> + printf ("info: shift=%d\n", shift);
> + xftruncate (infd, 0);
> + xlseek (infd, 0, SEEK_SET);
> + xwrite (infd, random_data, current_size - !shift);
> +
> + if (do_inoff)
> + {
> + inoff = shift;
> + xlseek (infd, 2, SEEK_SET);
> + }
> + else
> + {
> + inoff = 3;
> + xlseek (infd, shift, SEEK_SET);
> + }
> + ftruncate (outfd, 0);
> + xlseek (outfd, 0, SEEK_SET);
> + outoff = 0;
> +
> + /* First call copies current_size - 1 bytes. */
> + TEST_COMPARE (copy_file_range (infd, pinoff, outfd, poutoff,
> + current_size, 0), current_size - 1);
> + char *buffer = xmalloc (current_size);
> + TEST_COMPARE (pread64 (outfd, buffer, current_size, 0),
> + current_size - 1);
> + TEST_VERIFY (memcmp (buffer, random_data + shift, current_size - 1)
> + == 0);
> + free (buffer);
> +
> + if (do_inoff)
> + {
> + TEST_COMPARE (inoff, current_size - 1 + shift);
> + TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 2);
> + }
> + else
> + TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), current_size - 1 + shift);
> + if (do_outoff)
> + {
> + TEST_COMPARE (outoff, current_size - 1);
> + TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), 0);
> + }
> + else
> + TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), current_size - 1);
> +
> + /* First call copies zero bytes. */
> + TEST_COMPARE (copy_file_range (infd, pinoff, outfd, poutoff,
> + current_size, 0), 0);
> + /* And the offsets are unchanged. */
> + if (do_inoff)
> + {
> + TEST_COMPARE (inoff, current_size - 1 + shift);
> + TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 2);
> + }
> + else
> + TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), current_size - 1 + shift);
> + if (do_outoff)
> + {
> + TEST_COMPARE (outoff, current_size - 1);
> + TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), 0);
> + }
> + else
> + TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), current_size - 1);
> + }
> +}
> +
> +/* A named test function. */
> +struct test_case
> +{
> + const char *name;
> + void (*func) (void);
> + bool sizes; /* If true, call the test with different current_size values. */
> +};
> +
> +/* The available test cases. */
> +static struct test_case tests[] =
> + {
> + { "simple_file_copy", simple_file_copy, .sizes = true },
> + { "pipe_as_source", pipe_as_source, },
> + { "pipe_as_destination", pipe_as_destination, },
> + { "delayed_write_failure", delayed_write_failure, .sizes = true },
> + { "cross_device_failure", cross_device_failure, .sizes = true },
> + { "enospc_failure", enospc_failure, },
> + { "oappend_failure", oappend_failure, .sizes = true },
> + { "short_copy", short_copy, .sizes = true },
> + };
> +
> +static int
> +do_test (void)
> +{
> + for (unsigned char *p = random_data; p < array_end (random_data); ++p)
> + *p = rand () >> 24;
> +
> + infd = create_temp_file ("tst-copy_file_range-in-", &infile);
> + xclose (create_temp_file ("tst-copy_file_range-out-", &outfile));
> +
> + /* Try to find a different directory from the default input/output
> + file. */
> + {
> + struct stat64 instat;
> + xfstat (infd, &instat);
> + static const char *const candidates[] =
> + { NULL, "/var/tmp", "/dev/shm" };
> + for (const char *const *c = candidates; c < array_end (candidates); ++c)
> + {
> + const char *path = *c;
> + char *to_free = NULL;
> + if (path == NULL)
> + {
> + to_free = xreadlink ("/proc/self/exe");
> + path = dirname (to_free);
> + }
> +
> + struct stat64 cstat;
> + xstat (path, &cstat);
> + if (cstat.st_dev == instat.st_dev)
> + {
> + free (to_free);
> + continue;
> + }
> +
> + printf ("info: using alternate temporary files directory: %s\n", path);
> + xdevfile = xasprintf ("%s/tst-copy_file_range-xdev-XXXXXX", path);
> + free (to_free);
> + break;
> + }
> + if (xdevfile != NULL)
> + {
> + int xdevfd = mkstemp (xdevfile);
> + if (xdevfd < 0)
> + FAIL_EXIT1 ("mkstemp (\"%s\"): %m", xdevfile);
> + struct stat64 xdevst;
> + xfstat (xdevfd, &xdevst);
> + TEST_VERIFY (xdevst.st_dev != instat.st_dev);
> + add_temp_file (xdevfile);
> + xclose (xdevfd);
> + }
> + else
> + puts ("warning: no alternate directory on different file system found");
> + }
> + xclose (infd);
> +
> + for (do_inoff = 0; do_inoff < 2; ++do_inoff)
> + for (do_outoff = 0; do_outoff < 2; ++do_outoff)
> + for (struct test_case *test = tests; test < array_end (tests); ++test)
> + for (const int *size = typical_sizes;
> + size < array_end (typical_sizes); ++size)
> + {
> + current_size = *size;
> + if (test_verbose > 0)
> + printf ("info: %s do_inoff=%d do_outoff=%d current_size=%d\n",
> + test->name, do_inoff, do_outoff, current_size);
> +
> + inoff = 0;
> + if (do_inoff)
> + pinoff = &inoff;
> + else
> + pinoff = NULL;
> + outoff = 0;
> + if (do_outoff)
> + poutoff = &outoff;
> + else
> + poutoff = NULL;
> +
> + infd = xopen (infile, O_RDWR | O_LARGEFILE, 0);
> + xftruncate (infd, 0);
> + outfd = xopen (outfile, O_RDWR | O_LARGEFILE, 0);
> + xftruncate (outfd, 0);
> +
> + test->func ();
> +
> + xclose (infd);
> + xclose (outfd);
> +
> + if (!test->sizes)
> + /* Skip the other sizes unless they have been
> + requested. */
> + break;
> + }
> +
> + free (infile);
> + free (outfile);
> + free (xdevfile);
> +
> + return 0;
> +}
> +
> +#include <support/test-driver.c>
> diff --git a/manual/llio.texi b/manual/llio.texi
> index 8b2f599c79..37593f18d4 100644
> --- a/manual/llio.texi
> +++ b/manual/llio.texi
> @@ -41,6 +41,7 @@ directly.)
> * Stream/Descriptor Precautions:: Precautions needed if you use both
> descriptors and streams.
> * Scatter-Gather:: Fast I/O to discontinuous buffers.
> +* Copying File Data:: Copying data between files.
> * Memory-mapped I/O:: Using files like memory.
> * Waiting for I/O:: How to check for input or output
> on multiple file descriptors.
> @@ -1353,6 +1354,80 @@ When the source file is compiled using @code{_FILE_OFFSET_BITS == 64} on a
> @code{pwritev2} and so transparently replaces the 32 bit interface.
> @end deftypefun
>
> +@node Copying File Data
> +@section Copying data between two files
> +@cindex copying files
> +@cindex file copy
> +
> +A special function is provided to copy data between two files on the
> +same file system. The system can optimize such copy operations. This
> +is particularly important on network file systems, where the data would
> +otherwise have to be transferred twice over the network.
> +
> +Note that this function only copies file data, but not metadata such as
> +file permissions or extended attributes.
> +
> +@deftypefun ssize_t copy_file_range (int @var{inputfd}, off64_t *@var{inputpos}, int @var{outputfd}, off64_t *@var{outputpos}, ssize_t @var{length}, unsigned int @var{flags})
> +@standards{GNU, unistd.h}
> +@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
> +
> +This function copies up to @var{length} bytes from the file descriptor
> +@var{inputfd} to the file descriptor @var{outputfd}.
> +
> +The function can operate on both the current file position (like
> +@code{read} and @code{write}) and an explicit offset (like @code{pread}
> +and @code{pwrite}). If the @var{inputpos} pointer is null, the file
> +position of @var{inputfd} is used as the starting point of the copy
> +operation, and the file position is advanced during it. If
> +@var{inputpos} is not null, then @code{*@var{inputpos}} is used as the
> +starting point of the copy operation, and @code{*@var{inputpos}} is
> +incremented by the number of copied bytes, but the file position remains
> +unchanged. Similar rules apply to @var{outputfd} and @var{outputpos}
> +for the output file position.
> +
> +The @var{flags} argument is currently reserved and must be zero.
> +
> +The @code{copy_file_range} function returns the number of bytes copied.
> +This can be less than the specified @var{length} in case the input file
> +contains fewer remaining bytes than @var{length}, or if a read or write
> +failure occurs. The return value is zero if the end of the input file
> +is encountered immediately.
> +
> +If no bytes can be copied, to report an error, @code{copy_file_range}
> +returns the value @math{-1} and sets @code{errno}. The following
> +@code{errno} error conditions are specific to this function:
> +
> +@table @code
> +@item EISDIR
> +At least one of the descriptors @var{inputfd} or @var{outputfd} refers
> +to a directory.
> +
> +@item EINVAL
> +At least one of the descriptors @var{inputfd} or @var{outputfd} refers
> +to a non-regular, non-directory file (such as a socket or a FIFO).
> +
> +The @var{flags} argument is not zero.
> +
> +@item EBADF
> +The argument @var{inputfd} is not a valid file descriptor open for
> +reading.
> +
> +The argument @var{outputfd} is not a valid file descriptor open for
> +writing, or @var{outputfd} has been opened with @code{O_APPEND}.
> +
> +@item EXDEV
> +The input and output files reside on different file systems.
> +@end table
> +
> +In addition, @code{copy_file_range} can fail with the error codes
> +which are used by @code{read}, @code{pread}, @code{write}, and
> +@code{pwrite}.
> +
> +The @code{copy_file_range} function is a cancellation point. In case of
> +cancellation, the input location (the file position or the value at
> +@code{*@var{inputpos}}) is indeterminate.
> +@end deftypefun
> +
> @node Memory-mapped I/O
> @section Memory-mapped I/O
>
> diff --git a/posix/unistd.h b/posix/unistd.h
> index 32b0f4898f..65317c79fd 100644
> --- a/posix/unistd.h
> +++ b/posix/unistd.h
> @@ -1105,7 +1105,12 @@ extern int lockf64 (int __fd, int __cmd, __off64_t __len) __wur;
> do __result = (long int) (expression); \
> while (__result == -1L && errno == EINTR); \
> __result; }))
> -#endif
> +
> +/* Copy LENGTH bytes from INFD to OUTFD. */
> +ssize_t copy_file_range (int __infd, __off64_t *__pinoff,
> + int __outfd, __off64_t *__poutoff,
> + size_t __length, unsigned int __flags);
> +#endif /* __USE_GNU */
>
> #if defined __USE_POSIX199309 || defined __USE_UNIX98
> /* Synchronize at least the data part of a file with the underlying
> diff --git a/support/Makefile b/support/Makefile
> index bb81825fc2..7aa8dd0bdd 100644
> --- a/support/Makefile
> +++ b/support/Makefile
> @@ -36,6 +36,7 @@ libsupport-routines = \
> oom_error \
> resolv_test \
> set_fortify_handler \
> + support-xfstat \
> support-xstat \
> support_become_root \
> support_can_chroot \
> @@ -73,8 +74,10 @@ libsupport-routines = \
> xfclose \
> xfopen \
> xfork \
> + xftruncate \
> xgetsockname \
> xlisten \
> + xlseek \
> xmalloc \
> xmemstream \
> xmkdir \
> diff --git a/support/support-xfstat.c b/support/support-xfstat.c
> new file mode 100644
> index 0000000000..4c8ee9142b
> --- /dev/null
> +++ b/support/support-xfstat.c
> @@ -0,0 +1,28 @@
> +/* fstat64 with error checking.
> + Copyright (C) 2017 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
> + <http://www.gnu.org/licenses/>. */
> +
> +#include <support/check.h>
> +#include <support/xunistd.h>
> +#include <sys/stat.h>
> +
> +void
> +xfstat (int fd, struct stat64 *result)
> +{
> + if (fstat64 (fd, result) != 0)
> + FAIL_EXIT1 ("fstat64 (%d): %m", fd);
> +}
> diff --git a/support/xftruncate.c b/support/xftruncate.c
> new file mode 100644
> index 0000000000..9c4e9e3050
> --- /dev/null
> +++ b/support/xftruncate.c
> @@ -0,0 +1,27 @@
> +/* ftruncate with error checking.
> + Copyright (C) 2017 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
> + <http://www.gnu.org/licenses/>. */
> +
> +#include <support/check.h>
> +#include <support/xunistd.h>
> +
> +void
> +xftruncate (int fd, long long length)
> +{
> + if (ftruncate64 (fd, length) != 0)
> + FAIL_EXIT1 ("ftruncate64 (%d, %lld): %m", fd, length);
> +}
> diff --git a/support/xlseek.c b/support/xlseek.c
> new file mode 100644
> index 0000000000..0a75a9f2e6
> --- /dev/null
> +++ b/support/xlseek.c
> @@ -0,0 +1,29 @@
> +/* lseek with error checking.
> + Copyright (C) 2017 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
> + <http://www.gnu.org/licenses/>. */
> +
> +#include <support/check.h>
> +#include <support/xunistd.h>
> +
> +long long
> +xlseek (int fd, long long offset, int whence)
> +{
> + long long result = lseek64 (fd, offset, whence);
> + if (result < 0)
> + FAIL_EXIT1 ("lseek64 (%d, %lld, %d): %m", fd, offset, whence);
> + return result;
> +}
> diff --git a/support/xunistd.h b/support/xunistd.h
> index 05c2626a7b..548f234788 100644
> --- a/support/xunistd.h
> +++ b/support/xunistd.h
> @@ -36,9 +36,12 @@ void xpipe (int[2]);
> void xdup2 (int, int);
> int xopen (const char *path, int flags, mode_t);
> void xstat (const char *path, struct stat64 *);
> +void xfstat (int fd, struct stat64 *);
> void xmkdir (const char *path, mode_t);
> void xchroot (const char *path);
> void xunlink (const char *path);
> +long long xlseek (int fd, long long offset, int whence);
> +void xftruncate (int fd, long long length);
>
> /* Read the link at PATH. The caller should free the returned string
> with free. */
> diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> index 3448d62cee..4ffcd7fcfd 100644
> --- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> @@ -2104,6 +2104,7 @@ GLIBC_2.26 pwritev2 F
> GLIBC_2.26 pwritev64v2 F
> GLIBC_2.26 reallocarray F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist
> index d064f5445e..32777457d9 100644
> --- a/sysdeps/unix/sysv/linux/alpha/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist
> @@ -2015,6 +2015,7 @@ GLIBC_2.26 pwritev2 F
> GLIBC_2.26 pwritev64v2 F
> GLIBC_2.26 reallocarray F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/arm/libc.abilist b/sysdeps/unix/sysv/linux/arm/libc.abilist
> index a5ce7964d0..a0fc14b0fc 100644
> --- a/sysdeps/unix/sysv/linux/arm/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/arm/libc.abilist
> @@ -105,6 +105,7 @@ GLIBC_2.26 pwritev2 F
> GLIBC_2.26 pwritev64v2 F
> GLIBC_2.26 reallocarray F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/copy_file_range.c b/sysdeps/unix/sysv/linux/copy_file_range.c
> new file mode 100644
> index 0000000000..1ec5f9d8d8
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/copy_file_range.c
> @@ -0,0 +1,46 @@
> +/* Linux implementation of copy_file_range.
> + Copyright (C) 2017 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
> + <http://www.gnu.org/licenses/>. */
> +
> +#include <errno.h>
> +#include <sysdep-cancel.h>
> +#include <unistd.h>
> +
> +/* Include the fallback implementation. */
> +#ifndef __ASSUME_COPY_FILE_RANGE
> +#define COPY_FILE_RANGE_DECL static
> +#define COPY_FILE_RANGE copy_file_range_compat
> +#include <io/copy_file_range-compat.c>
> +#endif
> +
> +ssize_t
> +copy_file_range (int infd, __off64_t *pinoff,
> + int outfd, __off64_t *poutoff,
> + size_t length, unsigned int flags)
> +{
> +#ifdef __NR_copy_file_range
> + ssize_t ret = SYSCALL_CANCEL (copy_file_range, infd, pinoff, outfd, poutoff,
> + length, flags);
> +# ifndef __ASSUME_COPY_FILE_RANGE
> + if (ret == -1 && errno == ENOSYS)
> + ret = copy_file_range_compat (infd, pinoff, outfd, poutoff, length, flags);
> +# endif
> + return ret;
> +#else /* !__NR_copy_file_range */
> + return copy_file_range_compat (infd, pinoff, outfd, poutoff, length, flags);
> +#endif
> +}
> diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
> index 69ddf15361..12e2b0b206 100644
> --- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
> @@ -1869,6 +1869,7 @@ GLIBC_2.26 pwritev2 F
> GLIBC_2.26 pwritev64v2 F
> GLIBC_2.26 reallocarray F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
> index a140edd4a3..52964476d5 100644
> --- a/sysdeps/unix/sysv/linux/i386/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
> @@ -2034,6 +2034,7 @@ GLIBC_2.26 strtof128_l F
> GLIBC_2.26 wcstof128 F
> GLIBC_2.26 wcstof128_l F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist
> index 178c0a45ec..58c1b0add8 100644
> --- a/sysdeps/unix/sysv/linux/ia64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist
> @@ -1898,6 +1898,7 @@ GLIBC_2.26 strtof128_l F
> GLIBC_2.26 wcstof128 F
> GLIBC_2.26 wcstof128_l F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h
> index 59b613377f..b9864790c7 100644
> --- a/sysdeps/unix/sysv/linux/kernel-features.h
> +++ b/sysdeps/unix/sysv/linux/kernel-features.h
> @@ -111,3 +111,7 @@
> #if __LINUX_KERNEL_VERSION >= 0x040400
> # define __ASSUME_MLOCK2 1
> #endif
> +
> +#if __LINUX_KERNEL_VERSION >= 0x040500
> +# define __ASSUME_COPY_FILE_RANGE 1
> +#endif
> diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> index 01d10d907c..915ffbb7e8 100644
> --- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> @@ -106,6 +106,7 @@ GLIBC_2.26 pwritev2 F
> GLIBC_2.26 pwritev64v2 F
> GLIBC_2.26 reallocarray F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> index 3ad08c20bf..d2e0ebfebe 100644
> --- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> @@ -1983,6 +1983,7 @@ GLIBC_2.26 pwritev2 F
> GLIBC_2.26 pwritev64v2 F
> GLIBC_2.26 reallocarray F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/microblaze/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/libc.abilist
> index 6bd7be1929..c58669ba2e 100644
> --- a/sysdeps/unix/sysv/linux/microblaze/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/microblaze/libc.abilist
> @@ -2104,6 +2104,7 @@ GLIBC_2.26 pwritev2 F
> GLIBC_2.26 pwritev64v2 F
> GLIBC_2.26 reallocarray F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> index 9b1e890eda..dd120b02c9 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> @@ -1958,6 +1958,7 @@ GLIBC_2.26 pwritev2 F
> GLIBC_2.26 pwritev64v2 F
> GLIBC_2.26 reallocarray F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> index 3eb5b66f8b..2aeb46917c 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> @@ -1956,6 +1956,7 @@ GLIBC_2.26 pwritev2 F
> GLIBC_2.26 pwritev64v2 F
> GLIBC_2.26 reallocarray F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> index 543a725114..b24b4134ca 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> @@ -1954,6 +1954,7 @@ GLIBC_2.26 pwritev2 F
> GLIBC_2.26 pwritev64v2 F
> GLIBC_2.26 reallocarray F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> index a9198a3936..6e4f827b69 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> @@ -1949,6 +1949,7 @@ GLIBC_2.26 pwritev2 F
> GLIBC_2.26 pwritev64v2 F
> GLIBC_2.26 reallocarray F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist
> index afacf1ff2d..ff4a3b9515 100644
> --- a/sysdeps/unix/sysv/linux/nios2/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist
> @@ -2145,6 +2145,7 @@ GLIBC_2.26 pwritev2 F
> GLIBC_2.26 pwritev64v2 F
> GLIBC_2.26 reallocarray F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> index 48af097b6a..71e49a13d8 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> @@ -1987,6 +1987,7 @@ GLIBC_2.26 pwritev2 F
> GLIBC_2.26 pwritev64v2 F
> GLIBC_2.26 reallocarray F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> index e30535dac9..2e8ca8bd93 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> @@ -1992,6 +1992,7 @@ GLIBC_2.26 pwritev2 F
> GLIBC_2.26 pwritev64v2 F
> GLIBC_2.26 reallocarray F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
> index f522700890..f0c7a65b39 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
> @@ -2199,6 +2199,7 @@ GLIBC_2.26 strtof128_l F
> GLIBC_2.26 wcstof128 F
> GLIBC_2.26 wcstof128_l F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
> index d3092afd25..95db2aad5c 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
> @@ -106,6 +106,7 @@ GLIBC_2.26 pwritev2 F
> GLIBC_2.26 pwritev64v2 F
> GLIBC_2.26 reallocarray F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> index 752176108e..c77fa8e07f 100644
> --- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> @@ -1987,6 +1987,7 @@ GLIBC_2.26 pwritev2 F
> GLIBC_2.26 pwritev64v2 F
> GLIBC_2.26 reallocarray F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> index b6d4c73635..c48fdcb978 100644
> --- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> @@ -1888,6 +1888,7 @@ GLIBC_2.26 pwritev2 F
> GLIBC_2.26 pwritev64v2 F
> GLIBC_2.26 reallocarray F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/sh/libc.abilist b/sysdeps/unix/sysv/linux/sh/libc.abilist
> index 1ee21fe8e8..7c77f15c65 100644
> --- a/sysdeps/unix/sysv/linux/sh/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sh/libc.abilist
> @@ -1873,6 +1873,7 @@ GLIBC_2.26 pwritev2 F
> GLIBC_2.26 pwritev64v2 F
> GLIBC_2.26 reallocarray F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> index e652191c60..c23a2d9ca7 100644
> --- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> @@ -1980,6 +1980,7 @@ GLIBC_2.26 pwritev2 F
> GLIBC_2.26 pwritev64v2 F
> GLIBC_2.26 reallocarray F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> index 37cf8713a5..1c035bceec 100644
> --- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> @@ -1917,6 +1917,7 @@ GLIBC_2.26 pwritev2 F
> GLIBC_2.26 pwritev64v2 F
> GLIBC_2.26 reallocarray F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist
> index 57427eb3ee..d843815aa6 100644
> --- a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist
> @@ -2111,6 +2111,7 @@ GLIBC_2.26 pwritev2 F
> GLIBC_2.26 pwritev64v2 F
> GLIBC_2.26 reallocarray F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist
> index 321f65c600..9d8b6f7ed2 100644
> --- a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist
> @@ -2111,6 +2111,7 @@ GLIBC_2.26 pwritev2 F
> GLIBC_2.26 pwritev64v2 F
> GLIBC_2.26 reallocarray F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist b/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist
> index 57427eb3ee..d843815aa6 100644
> --- a/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist
> @@ -2111,6 +2111,7 @@ GLIBC_2.26 pwritev2 F
> GLIBC_2.26 pwritev64v2 F
> GLIBC_2.26 reallocarray F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> index f26c8b99d5..7365702953 100644
> --- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> @@ -1875,6 +1875,7 @@ GLIBC_2.26 strtof128_l F
> GLIBC_2.26 wcstof128 F
> GLIBC_2.26 wcstof128_l F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
> diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> index 2a6057154b..ebc228d4e7 100644
> --- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> @@ -2118,6 +2118,7 @@ GLIBC_2.26 strtof128_l F
> GLIBC_2.26 wcstof128 F
> GLIBC_2.26 wcstof128_l F
> GLIBC_2.27 GLIBC_2.27 A
> +GLIBC_2.27 copy_file_range F
> GLIBC_2.27 glob F
> GLIBC_2.27 glob64 F
> GLIBC_2.27 memfd_create F
>
Attachment:
tst-copy_file_range.out
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