@@ -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
@@ -125,4 +125,7 @@ libc {
GLIBC_2.23 {
fts64_children; fts64_close; fts64_open; fts64_read; fts64_set;
}
+ GLIBC_2.27 {
+ copy_file_range;
+ }
}
new file mode 100644
@@ -0,0 +1,163 @@
+/* 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))
+ 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];
+ 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)
+ {
+ /* Assume that this means no space on the target file
+ system, and use the error handling path below. */
+ __set_errno (ENOSPC);
+ write_count = -1;
+ }
+ 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;
+ size_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;
+}
new file mode 100644
@@ -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-common.c>
new file mode 100644
@@ -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-common.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"
new file mode 100644
@@ -0,0 +1,729 @@
+/* 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 (lseek (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 (lseek (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 (pread (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 (pread (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 (pread (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 (pread (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 (pread (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>
@@ -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.
@@ -1363,6 +1364,80 @@ may be easier to use than these functions. However, @code{readv} and
(as opposed to the total output), are large. In that case, a high-level
stream would not be able to cache the data efficiently.
+@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 result with the error codes
+which are used by @code{read}, @code{pread}, @code{write}, and
+@code{pwrite}.
+
+The @code{copy_file_range} 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
@@ -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
@@ -36,12 +36,14 @@ libsupport-routines = \
oom_error \
resolv_test \
set_fortify_handler \
+ support-xfstat \
support-xstat \
support_become_root \
support_can_chroot \
support_capture_subprocess \
support_capture_subprocess_check \
support_chroot \
+ support_enter_mount_namespace \
support_enter_network_namespace \
support_format_address_family \
support_format_addrinfo \
@@ -72,8 +74,10 @@ libsupport-routines = \
xfclose \
xfopen \
xfork \
+ xftruncate \
xgetsockname \
xlisten \
+ xlseek \
xmalloc \
xmemstream \
xmkdir \
@@ -51,6 +51,11 @@ bool support_can_chroot (void);
has sufficient privileges. */
bool support_enter_network_namespace (void);
+/* Enter a mount namespace and mark / as private (not shared). If
+ this function returns true, mount operations in this process will
+ not affect the host system afterwards. */
+bool support_enter_mount_namespace (void);
+
/* Return true if support_enter_network_namespace managed to enter a
UTS namespace. */
bool support_in_uts_namespace (void);
new file mode 100644
@@ -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);
+}
new file mode 100644
@@ -0,0 +1,45 @@
+/* Enter a mount namespace.
+ 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/namespace.h>
+
+#include <sched.h>
+#include <stdio.h>
+#include <sys/mount.h>
+
+bool
+support_enter_mount_namespace (void)
+{
+#ifdef CLONE_NEWNS
+ if (unshare (CLONE_NEWNS) == 0)
+ {
+ /* On some systems, / is marked as MS_SHARED, which means that
+ mounts within the namespace leak to the rest of the system,
+ which is not what we want. */
+ if (mount ("none", "/", NULL, MS_REC | MS_PRIVATE, NULL) != 0)
+ {
+ printf ("warning: making the mount namespace private failed: %m\n");
+ return false;
+ }
+ return true;
+ }
+ else
+ printf ("warning: unshare (CLONE_NEWNS) failed: %m\n");
+#endif /* CLONE_NEWNS */
+ return false;
+}
new file mode 100644
@@ -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);
+}
new file mode 100644
@@ -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;
+}
@@ -36,10 +36,13 @@ 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 xsysconf (int name);
+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. */
@@ -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
@@ -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
@@ -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
new file mode 100644
@@ -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-common.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
+}
@@ -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
@@ -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
@@ -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
@@ -107,3 +107,8 @@
#if __LINUX_KERNEL_VERSION >= 0x031300
# define __ASSUME_EXECVEAT 1
#endif
+
+/* Support for the copy_file_range syscall was added in 4.5. */
+#if __LINUX_KERNEL_VERSION >= 0x040500
+# define __ASSUME_COPY_FILE_RANGE 1
+#endif
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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