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Re: [PATCH v3 2/2] posix: Implement preadv2 and pwritev2
I will commit this shortly.
On 30/05/2017 11:18, Adhemerval Zanella wrote:
> Ping x2. Any impeding issue about this patch? Otherwise I would like to push it.
>
> On 11/05/2017 16:01, Adhemerval Zanella wrote:
>> Ping.
>>
>> On 04/05/2017 09:43, Adhemerval Zanella wrote:
>>> Change from previous version:
>>>
>>> * Add unsupported flag check for Linux implementation.
>>>
>>> * Unsupported/invalid flags now return EOPNOTSUPP instead of
>>> EINVAL.
>>>
>>> * Add comment about preadv2 and pwritev2 support on kernel-features.h.
>>>
>>> * Add NEWS entry.
>>>
>>> * Fix typo in documentation.
>>>
>>> --
>>>
>>> This patch adds support of preadv2 and pwritev2 which are similar to
>>> preadv/pwritev but adds an extra flag argument. As for preadv/pwritev
>>> both interfaces are added a non-standard standard GNU API.
>>>
>>> On default 'posix' implementation trying to emulate the Linux supported
>>> flags is troublesome:
>>>
>>> * We can not temporary change the file state of the O_DSYNC and O_SYNC
>>> flags to emulate RWF_{D}SYNC (attempts to change the state of using
>>> fcntl are silently ignored).
>>>
>>> * IOCB_HIPRI requires the file opened in O_DIRECT and uses an internal
>>> semantic not provided by any other flag (O_NONBLOCK for instance).
>>>
>>> So default sysdeps/posix implementations fails with EINVAL for any non
>>> supported flag (which are none currently) calls generic preadv/pwritev.
>>> Basically, it supports only preadv2 called as preadv (with flags sets
>>> to 0).
>>>
>>> The Linux one uses the preadv2/pwritev2 syscall if defined, otherwise it
>>> call preadv/writev. Instead of using the previous __ASSUME_* to
>>> unconditionally issue the syscall (and avoid building the fallback routine),
>>> it call pread/write if the preadv2/pwritev2 syscalls fails. The idea
>>> is just avoid adding another __ASSUME_* and checking each architecture
>>> on every kernel bump and simplify code conditionals.
>>>
>>> Checked on x86_64-linux-gnu and on i686-linux-gnu and a check with
>>> run-built-tests=no on aarch64-linux-gnu, alpha-linux-gnu, arm-linux-gnueabihf,
>>> ia64-linux-gnu, m68k-linux-gnu, microblaze-linux-gnu, mips{64,64n32}-linux-gnu,
>>> nios2-linux-gnu, powerpc{64,64le}-linux-gnu, s390{x}-linux-gnu,
>>> sparc{64,v9}-linux-gnu, tile{gx,pro}-linux-gnu, and sh4-linux-gnu (all using
>>> gcc 6.3).
>>>
>>> * NEWS: Add note about pwritev2 and preadv2 inclusion.
>>> * misc/Makefile (routines): Add preadv2, preadv64v2, pwritev2, and
>>> pwritev64v2.
>>> (tests): Add tst-preadvwritev2 and tst-preadvwritev64v2.
>>> * misc/Versions (GLIBC_2.26): Add preadv2, preadv64v2, pwritev2, and
>>> pwritev64v2.
>>> * misc/preadv2.c: New file.
>>> * misc/preadv64v2.c: Likewise.
>>> * misc/pwritev2.c: Likewise.
>>> * misc/pwritev64v2.c: Likewise.
>>> * misc/tst-preadvwritev2.c: Likewise.
>>> * misc/tst-preadvwritev64v2.c: Likewise.
>>> * manual/llio.texi: Add preadv2 and pwritev2 documentation.
>>> * misc/sys/uio.h [__USE_GNU && !__USE_FILE_OFFSET64] (preadv2): New
>>> prototype.
>>> [__USE_GNU && !__USE_FILE_OFFSET64] (pwritev2): Likewise.
>>> [__USE_GNU && __USE_FILE_OFFSET64] (preadv64v2): Likewise.
>>> [__USE_GNU && __USE_FILE_OFFSET64] (pwritev64v2): Likewise.
>>> * misc/tst-preadvwritev-common.c (PREADV): Define if not defined.
>>> (PWRITEV): Likewise.
>>> (do_test_with_offset): Use PREADV and PWRITEV macros and check for
>>> ENOSYS.
>>> * nptl/tst-cancel4.c (tf_pwritev2): New test.
>>> (tf_preadv2): Likewise.
>>> (tf_fsync): Add tf_pwritev2 and tf_preadv2.
>>> * sysdeps/posix/preadv2.c: Likewise.
>>> * sysdeps/posix/preadv64v2.c: Likewise.
>>> * sysdeps/posix/pwritev2.c: Likewise.
>>> * sysdeps/posix/pwritev64v2.c: Likewise.
>>> * sysdeps/unix/sysv/linux/kernel-features.h: Add comment for syscall
>>> support in kernel.
>>> * sysdeps/unix/sysv/linux/preadv2.c: Likewise.
>>> * sysdeps/unix/sysv/linux/preadv64v2.c: Likewise.
>>> * sysdeps/unix/sysv/linux/pwritev2.c: Likewise.
>>> * sysdeps/unix/sysv/linux/pwritev64v2.c: Likewise.
>>> * sysdeps/unix/sysv/linux/preadv.c (preadv): Add libc_hidden_def.
>>> * sysdeps/unix/sysv/linux/preadv64.c (preadv64): Likewise.
>>> * sysdeps/unix/sysv/linux/pwritev.c (pwritev): Likewise.
>>> * sysdeps/unix/sysv/linux/pwritev64.c (pwritev64): Likewise.
>>> * sysdeps/unix/sysv/linux/bits/uio.h: Add supported preadv2/pwritev2
>>> support flags on Linux.
>>> * sysdeps/unix/sysv/linux/aarch64/libc.abilist (GLIBC_2.26): Add
>>> preadv2, preadv64v2, pwritev2, pwritev64v2.
>>> * sysdeps/unix/sysv/linux/alpha/libc.abilist (GLIBC_2.26): Likewise.
>>> * sysdeps/unix/sysv/linux/arm/libc.abilist (GLIBC_2.26): Likewise.
>>> * sysdeps/unix/sysv/linux/hppa/libc.abilist (GLIBC_2.26): Likewise.
>>> * sysdeps/unix/sysv/linux/i386/libc.abilist (GLIBC_2.26): Likewise.
>>> * sysdeps/unix/sysv/linux/ia64/libc.abilist (GLIBC_2.26): Likewise.
>>> * sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist (GLIBC_2.26):
>>> Likewise.
>>> * sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist (GLIBC_2.26):
>>> Likewise.
>>> * sysdeps/unix/sysv/linux/microblaze/libc.abilist (GLIBC_2.26):
>>> Likewise.
>>> * sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist (GLIBC_2.26):
>>> Likewise.
>>> * sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist (GLIBC_2.26):
>>> Likewise.
>>> * sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist (GLIBC_2.26):
>>> Likewise.
>>> * sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist (GLIBC_2.26):
>>> Likewise.
>>> * sysdeps/unix/sysv/linux/nios2/libc.abilist (GLIBC_2.26): Likewise.
>>> * sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
>>> (GLIBC_2.26): Likewise.
>>> * sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
>>> (GLIBC_2.26): Likewise.
>>> * sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist (GLIBC_2.26):
>>> Likewise.
>>> * sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
>>> (GLIBC_2.26): Likewise.
>>> * sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist (GLIBC_2.26):
>>> Likewise.
>>> * sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist (GLIBC_2.26):
>>> Likewise.
>>> * sysdeps/unix/sysv/linux/sh/libc.abilist (GLIBC_2.26): Likewise.
>>> * sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist (GLIBC_2.26):
>>> Likewise.
>>> * sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist (GLIBC_2.26):
>>> Likewise.
>>> * sysdeps/sysv/linux/tile/tilegx/tilegx32/libc.abilist (GLIBC_2.26):
>>> Likewise.
>>> * sysdeps/sysv/linux/tile/tilegx/tilegx64/libc.abilist (GLIBC_2.26):
>>> Likewise.
>>> * sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist (GLIBC_2.26):
>>> Likewise.
>>> * sysdeps/unix/sysv/linux/x86_64/64/libc.abilist (GLIBC_2.26):
>>> Likewise.
>>> * sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist (GLIBC_2.26):
>>> Likewise.
>>> ---
>>> ChangeLog | 91 +++++++++++++++++
>>> NEWS | 7 ++
>>> include/sys/uio.h | 6 ++
>>> manual/llio.texi | 109 +++++++++++++++++++++
>>> misc/Makefile | 5 +-
>>> misc/Versions | 3 +
>>> misc/preadv2.c | 30 ++++++
>>> misc/preadv64v2.c | 30 ++++++
>>> misc/pwritev2.c | 30 ++++++
>>> misc/pwritev64v2.c | 30 ++++++
>>> misc/sys/uio.h | 41 ++++++++
>>> misc/tst-preadvwritev-common.c | 19 +++-
>>> misc/tst-preadvwritev2.c | 31 ++++++
>>> misc/tst-preadvwritev64v2.c | 33 +++++++
>>> nptl/tst-cancel4.c | 71 ++++++++++++++
>>> sysdeps/posix/preadv2.c | 38 +++++++
>>> sysdeps/posix/preadv64v2.c | 37 +++++++
>>> sysdeps/posix/pwritev2.c | 38 +++++++
>>> sysdeps/posix/pwritev64v2.c | 38 +++++++
>>> sysdeps/unix/sysv/linux/aarch64/libc.abilist | 5 +
>>> sysdeps/unix/sysv/linux/alpha/libc.abilist | 5 +
>>> sysdeps/unix/sysv/linux/arm/libc.abilist | 5 +
>>> sysdeps/unix/sysv/linux/bits/uio.h | 6 ++
>>> sysdeps/unix/sysv/linux/hppa/libc.abilist | 5 +
>>> sysdeps/unix/sysv/linux/i386/libc.abilist | 5 +
>>> sysdeps/unix/sysv/linux/ia64/libc.abilist | 5 +
>>> sysdeps/unix/sysv/linux/kernel-features.h | 5 +
>>> sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist | 5 +
>>> sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist | 5 +
>>> sysdeps/unix/sysv/linux/microblaze/libc.abilist | 5 +
>>> .../unix/sysv/linux/mips/mips32/fpu/libc.abilist | 5 +
>>> .../unix/sysv/linux/mips/mips32/nofpu/libc.abilist | 5 +
>>> .../unix/sysv/linux/mips/mips64/n32/libc.abilist | 5 +
>>> .../unix/sysv/linux/mips/mips64/n64/libc.abilist | 5 +
>>> sysdeps/unix/sysv/linux/nios2/libc.abilist | 5 +
>>> .../sysv/linux/powerpc/powerpc32/fpu/libc.abilist | 5 +
>>> .../linux/powerpc/powerpc32/nofpu/libc.abilist | 5 +
>>> .../sysv/linux/powerpc/powerpc64/libc-le.abilist | 5 +
>>> .../unix/sysv/linux/powerpc/powerpc64/libc.abilist | 5 +
>>> sysdeps/unix/sysv/linux/preadv.c | 2 +
>>> sysdeps/unix/sysv/linux/preadv2.c | 55 +++++++++++
>>> sysdeps/unix/sysv/linux/preadv64.c | 2 +
>>> sysdeps/unix/sysv/linux/preadv64v2.c | 55 +++++++++++
>>> sysdeps/unix/sysv/linux/pwrite64.c | 1 +
>>> sysdeps/unix/sysv/linux/pwritev.c | 2 +
>>> sysdeps/unix/sysv/linux/pwritev2.c | 51 ++++++++++
>>> sysdeps/unix/sysv/linux/pwritev64.c | 2 +
>>> sysdeps/unix/sysv/linux/pwritev64v2.c | 55 +++++++++++
>>> sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist | 5 +
>>> sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist | 5 +
>>> sysdeps/unix/sysv/linux/sh/libc.abilist | 5 +
>>> sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist | 5 +
>>> sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist | 5 +
>>> .../sysv/linux/tile/tilegx/tilegx32/libc.abilist | 5 +
>>> .../sysv/linux/tile/tilegx/tilegx64/libc.abilist | 5 +
>>> sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist | 5 +
>>> sysdeps/unix/sysv/linux/x86_64/64/libc.abilist | 5 +
>>> sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist | 5 +
>>> 58 files changed, 1058 insertions(+), 5 deletions(-)
>>> create mode 100644 misc/preadv2.c
>>> create mode 100644 misc/preadv64v2.c
>>> create mode 100644 misc/pwritev2.c
>>> create mode 100644 misc/pwritev64v2.c
>>> create mode 100644 misc/tst-preadvwritev2.c
>>> create mode 100644 misc/tst-preadvwritev64v2.c
>>> create mode 100644 sysdeps/posix/preadv2.c
>>> create mode 100644 sysdeps/posix/preadv64v2.c
>>> create mode 100644 sysdeps/posix/pwritev2.c
>>> create mode 100644 sysdeps/posix/pwritev64v2.c
>>> create mode 100644 sysdeps/unix/sysv/linux/preadv2.c
>>> create mode 100644 sysdeps/unix/sysv/linux/preadv64v2.c
>>> create mode 100644 sysdeps/unix/sysv/linux/pwritev2.c
>>> create mode 100644 sysdeps/unix/sysv/linux/pwritev64v2.c
>>>
>>> diff --git a/NEWS b/NEWS
>>> index 5558ca3..afad4b1 100644
>>> --- a/NEWS
>>> +++ b/NEWS
>>> @@ -57,6 +57,13 @@ Version 2.26
>>> be added on next major revision of POSIX, so current support is enabled
>>> with _GNU_SOURCE.
>>>
>>> +* New preadv2 and pwritev2 are added to libc. They are Linux extensions to
>>> + preadv and pwritev with an additional flag argument where it is possible
>>> + to set high priority or use O_DSYNC or O_SYNC for an specific IO operation.
>>> + For complete support it requires Linux kernel version 4.6, otherwise a
>>> + compat implementation will be used (which refuses all flags and routes it
>>> + to preadv or pwritev).
>>> +
>>> Security related changes:
>>>
>>> * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
>>> diff --git a/include/sys/uio.h b/include/sys/uio.h
>>> index f44ce18..20860bf 100644
>>> --- a/include/sys/uio.h
>>> +++ b/include/sys/uio.h
>>> @@ -7,5 +7,11 @@ extern ssize_t __readv (int __fd, const struct iovec *__iovec,
>>> int __count);
>>> extern ssize_t __writev (int __fd, const struct iovec *__iovec,
>>> int __count);
>>> +
>>> +/* Used for p{read,write}{v64}v2 implementation. */
>>> +libc_hidden_proto (preadv)
>>> +libc_hidden_proto (preadv64)
>>> +libc_hidden_proto (pwritev)
>>> +libc_hidden_proto (pwritev64)
>>> #endif
>>> #endif
>>> diff --git a/manual/llio.texi b/manual/llio.texi
>>> index dae3754..404a966 100644
>>> --- a/manual/llio.texi
>>> +++ b/manual/llio.texi
>>> @@ -756,6 +756,115 @@ When the source file is compiled using @code{_FILE_OFFSET_BITS == 64} on a
>>> @code{pwritev} and so transparently replaces the 32 bit interface.
>>> @end deftypefun
>>>
>>> +@comment sys/uio.h
>>> +@comment GNU
>>> +@deftypefun ssize_t preadv2 (int @var{fd}, const struct iovec *@var{iov}, int @var{iovcnt}, off_t @var{offset}, int @var{flags})
>>> +@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
>>> +@c This is a syscall for Linux v4.6. The sysdeps/posix fallback emulation
>>> +@c is also MT-Safe since it calls preadv.
>>> +
>>> +This function is similar to the @code{preadv} function, with the difference
>>> +it adds an extra @var{flags} parameter of type @code{int}. The supported
>>> +@var{flags} are dependent of the underlying system. For Linux it supports:
>>> +
>>> +@vtable @code
>>> +@item RWF_HIPRI
>>> +High priority request. This adds a flag that tells the file system that
>>> +this is a high priority request for which it is worth to poll the hardware.
>>> +The flag is purely advisory and can be ignored if not supported. The
>>> +@var{fd} must be opened using @code{O_DIRECT}.
>>> +
>>> +@item RWF_DSYNC
>>> +Per-IO synchronization as if the file was opened with @code{O_DSYNC} flag.
>>> +
>>> +@item RWF_SYNC
>>> +Per-IO synchronization as if the file was opened with @code{O_SYNC} flag.
>>> +@end vtable
>>> +
>>> +When the source file is compiled with @code{_FILE_OFFSET_BITS == 64} the
>>> +@code{preadv2} function is in fact @code{preadv64v2} and the type
>>> +@code{off_t} has 64 bits, which makes it possible to handle files up to
>>> +@twoexp{63} bytes in length.
>>> +
>>> +The return value is a count of bytes (@emph{not} buffers) read, @math{0}
>>> +indicating end-of-file, or @math{-1} indicating an error. The possible
>>> +errors are the same as in @code{preadv} with the addition of:
>>> +
>>> +@table @code
>>> +
>>> +@item EOPNOTSUPP
>>> +
>>> +@c The default sysdeps/posix code will return it for any flags value
>>> +@c different than 0.
>>> +An unsupported @var{flags} was used.
>>> +
>>> +@end table
>>> +
>>> +@end deftypefun
>>> +
>>> +@comment unistd.h
>>> +@comment GNU
>>> +@deftypefun ssize_t preadv64v2 (int @var{fd}, const struct iovec *@var{iov}, int @var{iovcnt}, off64_t @var{offset}, int @var{flags})
>>> +@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
>>> +@c This is a syscall for Linux v4.6. The sysdeps/posix fallback emulation
>>> +@c is also MT-Safe since it calls preadv.
>>> +
>>> +This function is similar to the @code{preadv2} function with the difference
>>> +is that the @var{offset} parameter is of type @code{off64_t} instead of
>>> +@code{off_t}. It makes it possible on 32 bit machines to address
>>> +files larger than @twoexp{31} bytes and up to @twoexp{63} bytes. The
>>> +file descriptor @code{filedes} must be opened using @code{open64} since
>>> +otherwise the large offsets possible with @code{off64_t} will lead to
>>> +errors with a descriptor in small file mode.
>>> +
>>> +When the source file is compiled using @code{_FILE_OFFSET_BITS == 64} on a
>>> +32 bit machine this function is actually available under the name
>>> +@code{preadv2} and so transparently replaces the 32 bit interface.
>>> +@end deftypefun
>>> +
>>> +
>>> +@comment sys/uio.h
>>> +@comment GNU
>>> +@deftypefun ssize_t pwritev2 (int @var{fd}, const struct iovec *@var{iov}, int @var{iovcnt}, off_t @var{offset}, int @var{flags})
>>> +@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
>>> +@c This is a syscall for Linux v4.6. The sysdeps/posix fallback emulation
>>> +@c is also MT-Safe since it calls pwritev.
>>> +
>>> +This function is similar to the @code{pwritev} function, with the difference
>>> +it adds an extra @var{flags} parameter of type @code{int}. The supported
>>> +@var{flags} are dependent of the underlying system and for Linux it supports
>>> +the same ones as for @code{preadv2}.
>>> +
>>> +When the source file is compiled with @code{_FILE_OFFSET_BITS == 64} the
>>> +@code{pwritev2} function is in fact @code{pwritev64v2} and the type
>>> +@code{off_t} has 64 bits, which makes it possible to handle files up to
>>> +@twoexp{63} bytes in length.
>>> +
>>> +The return value is a count of bytes (@emph{not} buffers) write, @math{0}
>>> +indicating end-of-file, or @math{-1} indicating an error. The possible
>>> +errors are the same as in @code{preadv2}.
>>> +@end deftypefun
>>> +
>>> +@comment unistd.h
>>> +@comment GNU
>>> +@deftypefun ssize_t pwritev64v2 (int @var{fd}, const struct iovec *@var{iov}, int @var{iovcnt}, off64_t @var{offset}, int @var{flags})
>>> +@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
>>> +@c This is a syscall for Linux v4.6. The sysdeps/posix fallback emulation
>>> +@c is also MT-Safe since it calls pwritev.
>>> +
>>> +This function is similar to the @code{pwritev2} function with the difference
>>> +is that the @var{offset} parameter is of type @code{off64_t} instead of
>>> +@code{off_t}. It makes it possible on 32 bit machines to address
>>> +files larger than @twoexp{31} bytes and up to @twoexp{63} bytes. The
>>> +file descriptor @code{filedes} must be opened using @code{open64} since
>>> +otherwise the large offsets possible with @code{off64_t} will lead to
>>> +errors with a descriptor in small file mode.
>>> +
>>> +When the source file is compiled using @code{_FILE_OFFSET_BITS == 64} on a
>>> +32 bit machine this function is actually available under the name
>>> +@code{pwritev2} and so transparently replaces the 32 bit interface.
>>> +@end deftypefun
>>> +
>>>
>>> @node File Position Primitive
>>> @section Setting the File Position of a Descriptor
>>> diff --git a/misc/Makefile b/misc/Makefile
>>> index 622da67..bed46d7 100644
>>> --- a/misc/Makefile
>>> +++ b/misc/Makefile
>>> @@ -39,6 +39,7 @@ headers := sys/uio.h bits/uio.h sys/ioctl.h bits/ioctls.h bits/ioctl-types.h \
>>>
>>> routines := brk sbrk sstk ioctl \
>>> readv writev preadv preadv64 pwritev pwritev64 \
>>> + preadv2 preadv64v2 pwritev2 pwritev64v2 \
>>> setreuid setregid \
>>> seteuid setegid \
>>> getpagesize \
>>> @@ -79,7 +80,9 @@ gpl2lgpl := error.c error.h
>>> tests := tst-dirname tst-tsearch tst-fdset tst-efgcvt tst-mntent tst-hsearch \
>>> tst-error1 tst-pselect tst-insremque tst-mntent2 bug-hsearch1 \
>>> tst-mntent-blank-corrupt tst-mntent-blank-passno bug18240 \
>>> - tst-preadvwritev tst-preadvwritev64 tst-makedev tst-empty \
>>> + tst-preadvwritev tst-preadvwritev64 tst-preadvwritev2 \
>>> + tst-preadvwritev64v2 \
>>> + tst-makedev tst-empty \
>>> tst-atomic tst-atomic-long
>>> tests-static := tst-empty
>>>
>>> diff --git a/misc/Versions b/misc/Versions
>>> index f2c90ff..bafda78 100644
>>> --- a/misc/Versions
>>> +++ b/misc/Versions
>>> @@ -155,6 +155,9 @@ libc {
>>> GLIBC_2.25 {
>>> gnu_dev_major; gnu_dev_minor; gnu_dev_makedev;
>>> }
>>> + GLIBC_2.26 {
>>> + preadv2; preadv64v2; pwritev2; pwritev64v2;
>>> + }
>>> GLIBC_PRIVATE {
>>> __madvise;
>>> __mktemp;
>>> diff --git a/misc/preadv2.c b/misc/preadv2.c
>>> new file mode 100644
>>> index 0000000..a62dcaa
>>> --- /dev/null
>>> +++ b/misc/preadv2.c
>>> @@ -0,0 +1,30 @@
>>> +/* Default implementation of preadv2.
>>> + 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 <sys/uio.h>
>>> +
>>> +/* Same as preadv but with an additional flags argument. */
>>> +ssize_t
>>> +preadv2 (int fd, const struct iovec *vector, int count, off_t offset,
>>> + int flags)
>>> +{
>>> + __set_errno (ENOSYS);
>>> + return -1;
>>> +}
>>> +
>>> +stub_warning (preadv2)
>>> diff --git a/misc/preadv64v2.c b/misc/preadv64v2.c
>>> new file mode 100644
>>> index 0000000..a802c2f
>>> --- /dev/null
>>> +++ b/misc/preadv64v2.c
>>> @@ -0,0 +1,30 @@
>>> +/* Default implementation of preadv2 (LFS version).
>>> + 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 <sys/uio.h>
>>> +
>>> +/* Same as preadv64 but with an addional flag argument. */
>>> +ssize_t
>>> +preadv64v2 (int fd, const struct iovec *vector, int count, off64_t offset,
>>> + int flags)
>>> +{
>>> + __set_errno (ENOSYS);
>>> + return -1;
>>> +}
>>> +
>>> +stub_warning (preadv64v2)
>>> diff --git a/misc/pwritev2.c b/misc/pwritev2.c
>>> new file mode 100644
>>> index 0000000..b9e0727
>>> --- /dev/null
>>> +++ b/misc/pwritev2.c
>>> @@ -0,0 +1,30 @@
>>> +/* Default implementation of pwritev2.
>>> + 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 <sys/uio.h>
>>> +
>>> +/* Same as pwritev but with an additional flags argument. */
>>> +ssize_t
>>> +pwritev2 (int fd, const struct iovec *vector, int count, off_t offset,
>>> + int flags)
>>> +{
>>> + __set_errno (ENOSYS);
>>> + return -1;
>>> +}
>>> +
>>> +stub_warning (pwritev2)
>>> diff --git a/misc/pwritev64v2.c b/misc/pwritev64v2.c
>>> new file mode 100644
>>> index 0000000..1f874f0
>>> --- /dev/null
>>> +++ b/misc/pwritev64v2.c
>>> @@ -0,0 +1,30 @@
>>> +/* Default implementation of pwritev2 (LFS version).
>>> + 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 <sys/uio.h>
>>> +
>>> +/* Same as preadv64 but with an addional flag argument. */
>>> +ssize_t
>>> +pwritev64v2 (int fd, const struct iovec *vector, int count, off64_t offset,
>>> + int flags)
>>> +{
>>> + __set_errno (ENOSYS);
>>> + return -1;
>>> +}
>>> +
>>> +stub_warning (pwritev64v2)
>>> diff --git a/misc/sys/uio.h b/misc/sys/uio.h
>>> index e80f013..66c22f0 100644
>>> --- a/misc/sys/uio.h
>>> +++ b/misc/sys/uio.h
>>> @@ -76,6 +76,7 @@ extern ssize_t preadv (int __fd, const struct iovec *__iovec, int __count,
>>> __THROW. */
>>> extern ssize_t pwritev (int __fd, const struct iovec *__iovec, int __count,
>>> __off_t __offset) __wur;
>>> +
>>> # else
>>> # ifdef __REDIRECT
>>> extern ssize_t __REDIRECT (preadv, (int __fd, const struct iovec *__iovec,
>>> @@ -117,6 +118,46 @@ extern ssize_t pwritev64 (int __fd, const struct iovec *__iovec, int __count,
>>> # endif
>>> #endif /* Use misc. */
>>>
>>> +
>>> +#ifdef __USE_GNU
>>> +# ifndef __USE_FILE_OFFSET64
>>> +/* Same as preadv but with an additional flag argumenti defined at uio.h. */
>>> +extern ssize_t preadv2 (int __fp, const struct iovec *__iovec, int __count,
>>> + __off_t __offset, int ___flags) __wur;
>>> +
>>> +/* Same as preadv but with an additional flag argument defined at uio.h. */
>>> +extern ssize_t pwritev2 (int __fd, const struct iovec *__iodev, int __count,
>>> + __off_t __offset, int __flags) __wur;
>>> +
>>> +# else
>>> +# ifdef __REDIRECT
>>> +extern ssize_t __REDIRECT (pwritev2, (int __fd, const struct iovec *__iovec,
>>> + int __count, __off64_t __offset,
>>> + int __flags),
>>> + pwritev64v2) __wur;
>>> +extern ssize_t __REDIRECT (preadv2, (int __fd, const struct iovec *__iovec,
>>> + int __count, __off64_t __offset,
>>> + int __flags),
>>> + preadv64v2) __wur;
>>> +# else
>>> +# define preadv2 preadv64v2
>>> +# define pwritev2 pwritev64v2
>>> +# endif
>>> +# endif
>>> +
>>> +# ifdef __USE_LARGEFILE64
>>> +/* Same as preadv but with an additional flag argumenti defined at uio.h. */
>>> +extern ssize_t preadv64v2 (int __fp, const struct iovec *__iovec,
>>> + int __count, __off64_t __offset,
>>> + int ___flags) __wur;
>>> +
>>> +/* Same as preadv but with an additional flag argument defined at uio.h. */
>>> +extern ssize_t pwritev64v2 (int __fd, const struct iovec *__iodev,
>>> + int __count, __off64_t __offset,
>>> + int __flags) __wur;
>>> +# endif
>>> +#endif /* Use GNU. */
>>> +
>>> __END_DECLS
>>>
>>> #endif /* sys/uio.h */
>>> diff --git a/misc/tst-preadvwritev-common.c b/misc/tst-preadvwritev-common.c
>>> index 5540dfb..676d495 100644
>>> --- a/misc/tst-preadvwritev-common.c
>>> +++ b/misc/tst-preadvwritev-common.c
>>> @@ -18,6 +18,7 @@
>>>
>>> #include <stdio.h>
>>> #include <stdint.h>
>>> +#include <errno.h>
>>> #include <string.h>
>>> #include <sys/uio.h>
>>> #include <sys/stat.h>
>>> @@ -39,6 +40,16 @@ do_prepare (int argc, char **argv)
>>> }
>>> #define PREPARE do_prepare
>>>
>>> +#ifndef PREADV
>>> +# define PREADV(__fd, __iov, __iovcnt, __offset) \
>>> + preadv (__fd, __iov, __iovcnt, __offset)
>>> +#endif
>>> +
>>> +#ifndef PWRITEV
>>> +# define PWRITEV(__fd, __iov, __iovcnt, __offset) \
>>> + pwritev (__fd, __iov, __iovcnt, __offset)
>>> +#endif
>>> +
>>> static int
>>> do_test_with_offset (off_t offset)
>>> {
>>> @@ -58,13 +69,13 @@ do_test_with_offset (off_t offset)
>>> iov[1].iov_base = buf2;
>>> iov[1].iov_len = sizeof buf2;
>>>
>>> - ret = pwritev (temp_fd, iov, 2, offset);
>>> + ret = PWRITEV (temp_fd, iov, 2, offset);
>>> if (ret == -1)
>>> FAIL_RET ("first pwritev returned -1");
>>> if (ret != (sizeof buf1 + sizeof buf2))
>>> FAIL_RET ("first pwritev returned an unexpected value");
>>>
>>> - ret = pwritev (temp_fd, iov, 2, sizeof buf1 + sizeof buf2 + offset);
>>> + ret = PWRITEV (temp_fd, iov, 2, sizeof buf1 + sizeof buf2 + offset);
>>> if (ret == -1)
>>> FAIL_RET ("second pwritev returned -1");
>>> if (ret != (sizeof buf1 + sizeof buf2))
>>> @@ -82,7 +93,7 @@ do_test_with_offset (off_t offset)
>>> iov[1].iov_len = sizeof buf4;
>>>
>>> /* Now read two buffer with 32 and 64 bytes respectively. */
>>> - ret = preadv (temp_fd, iov, 2, offset);
>>> + ret = PREADV (temp_fd, iov, 2, offset);
>>> if (ret == -1)
>>> FAIL_RET ("first preadv returned -1");
>>> if (ret != (sizeof buf3 + sizeof buf4))
>>> @@ -93,7 +104,7 @@ do_test_with_offset (off_t offset)
>>> if (memcmp (buf2, buf4, sizeof buf2) != 0)
>>> FAIL_RET ("second buffer from first preadv different than expected");
>>>
>>> - ret = preadv (temp_fd, iov, 2, sizeof buf3 + sizeof buf4 + offset);
>>> + ret = PREADV (temp_fd, iov, 2, sizeof buf3 + sizeof buf4 + offset);
>>> if (ret == -1)
>>> FAIL_RET ("second preadv returned -1");
>>> if (ret != (sizeof buf3 + sizeof buf4))
>>> diff --git a/misc/tst-preadvwritev2.c b/misc/tst-preadvwritev2.c
>>> new file mode 100644
>>> index 0000000..cf36272
>>> --- /dev/null
>>> +++ b/misc/tst-preadvwritev2.c
>>> @@ -0,0 +1,31 @@
>>> +/* Tests for preadv2 and pwritev2.
>>> + Copyright (C) 2016-2017 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 PREADV(__fd, __iov, __iovcnt, __offset) \
>>> + preadv2 (__fd, __iov, __iovcnt, __offset, 0)
>>> +
>>> +#define PWRITEV(__fd, __iov, __iovcnt, __offset) \
>>> + pwritev2 (__fd, __iov, __iovcnt, __offset, 0)
>>> +
>>> +#include "tst-preadvwritev-common.c"
>>> +
>>> +static int
>>> +do_test (void)
>>> +{
>>> + return do_test_with_offset (0);
>>> +}
>>> diff --git a/misc/tst-preadvwritev64v2.c b/misc/tst-preadvwritev64v2.c
>>> new file mode 100644
>>> index 0000000..8d0c48e
>>> --- /dev/null
>>> +++ b/misc/tst-preadvwritev64v2.c
>>> @@ -0,0 +1,33 @@
>>> +/* Tests for preadv2 and pwritev2 (LFS version).
>>> + 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 _FILE_OFFSET_BITS 64
>>> +
>>> +#define PREADV(__fd, __iov, __iovcnt, __offset) \
>>> + preadv2 (__fd, __iov, __iovcnt, __offset, 0)
>>> +
>>> +#define PWRITEV(__fd, __iov, __iovcnt, __offset) \
>>> + pwritev2 (__fd, __iov, __iovcnt, __offset, 0)
>>> +
>>> +#include "tst-preadvwritev-common.c"
>>> +
>>> +static int
>>> +do_test (void)
>>> +{
>>> + return do_test_with_offset (0);
>>> +}
>>> diff --git a/nptl/tst-cancel4.c b/nptl/tst-cancel4.c
>>> index e66961f..7a560a1 100644
>>> --- a/nptl/tst-cancel4.c
>>> +++ b/nptl/tst-cancel4.c
>>> @@ -1079,6 +1079,75 @@ tf_pwritev (void *arg)
>>> }
>>>
>>> static void *
>>> +tf_pwritev2 (void *arg)
>>> +{
>>> + int fd;
>>> +
>>> + if (arg == NULL)
>>> + /* XXX If somebody can provide a portable test case in which pwritev2
>>> + blocks we can enable this test to run in both rounds. */
>>> + abort ();
>>> +
>>> + errno = 0;
>>> +
>>> + char fname[] = "/tmp/tst-cancel4-fd-XXXXXX";
>>> + tempfd = fd = mkstemp (fname);
>>> + if (fd == -1)
>>> + FAIL_EXIT1 ("mkstemp: %m");
>>> + unlink (fname);
>>> +
>>> + xpthread_barrier_wait (&b2);
>>> +
>>> + xpthread_barrier_wait (&b2);
>>> +
>>> + ssize_t s;
>>> + pthread_cleanup_push (cl, NULL);
>>> +
>>> + char buf[WRITE_BUFFER_SIZE];
>>> + memset (buf, '\0', sizeof (buf));
>>> + struct iovec iov[1] = { [0] = { .iov_base = buf, .iov_len = sizeof (buf) } };
>>> + s = pwritev2 (fd, iov, 1, 0, 0);
>>> +
>>> + pthread_cleanup_pop (0);
>>> +
>>> + FAIL_EXIT1 ("pwritev2 returns with %zd", s);
>>> +}
>>> +
>>> +static void *
>>> +tf_preadv2 (void *arg)
>>> +{
>>> + int fd;
>>> +
>>> + if (arg == NULL)
>>> + /* XXX If somebody can provide a portable test case in which preadv2
>>> + blocks we can enable this test to run in both rounds. */
>>> + abort ();
>>> +
>>> + errno = 0;
>>> +
>>> + char fname[] = "/tmp/tst-cancel4-fd-XXXXXX";
>>> + tempfd = fd = mkstemp (fname);
>>> + if (fd == -1)
>>> + FAIL_EXIT1 ("mkstemp failed: %m");
>>> + unlink (fname);
>>> +
>>> + xpthread_barrier_wait (&b2);
>>> +
>>> + xpthread_barrier_wait (&b2);
>>> +
>>> + ssize_t s;
>>> + pthread_cleanup_push (cl, NULL);
>>> +
>>> + char buf[100];
>>> + struct iovec iov[1] = { [0] = { .iov_base = buf, .iov_len = sizeof (buf) } };
>>> + s = preadv2 (fd, iov, 1, 0, 0);
>>> +
>>> + pthread_cleanup_pop (0);
>>> +
>>> + FAIL_EXIT1 ("preadv2 returns with %zd", s);
>>> +}
>>> +
>>> +static void *
>>> tf_fsync (void *arg)
>>> {
>>> if (arg == NULL)
>>> @@ -1473,7 +1542,9 @@ struct cancel_tests tests[] =
>>> ADD_TEST (recvfrom, 2, 0),
>>> ADD_TEST (recvmsg, 2, 0),
>>> ADD_TEST (preadv, 2, 1),
>>> + ADD_TEST (preadv2, 2, 1),
>>> ADD_TEST (pwritev, 2, 1),
>>> + ADD_TEST (pwritev2, 2, 1),
>>> ADD_TEST (open, 2, 1),
>>> ADD_TEST (close, 2, 1),
>>> ADD_TEST (pread, 2, 1),
>>> diff --git a/sysdeps/posix/preadv2.c b/sysdeps/posix/preadv2.c
>>> new file mode 100644
>>> index 0000000..2a7cf11
>>> --- /dev/null
>>> +++ b/sysdeps/posix/preadv2.c
>>> @@ -0,0 +1,38 @@
>>> +/* Generic version of preadv2.
>>> + 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 <unistd.h>
>>> +#include <sys/uio.h>
>>> +
>>> +#ifndef __OFF_T_MATCHES_OFF64_T
>>> +
>>> +/* Since we define no flags for preadv2 just route to preadv. */
>>> +ssize_t
>>> +preadv2 (int fd, const struct iovec *vector, int count, OFF_T offset,
>>> + int flags)
>>> +{
>>> + if (flags != 0)
>>> + {
>>> + __set_errno (EOPNOTSUPP);
>>> + return -1;
>>> + }
>>> +
>>> + return preadv (fd, vector, count, offset);
>>> +}
>>> +
>>> +#endif
>>> diff --git a/sysdeps/posix/preadv64v2.c b/sysdeps/posix/preadv64v2.c
>>> new file mode 100644
>>> index 0000000..e084f3f
>>> --- /dev/null
>>> +++ b/sysdeps/posix/preadv64v2.c
>>> @@ -0,0 +1,37 @@
>>> +/* Generic version of preadv2.
>>> + 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 <unistd.>
>>> +#include <sys/uio.h>
>>> +
>>> +ssize_t
>>> +preadv64v2 (int fd, const struct iovec *vector, int count, OFF_T offset,
>>> + int flags)
>>> +{
>>> + if (flags != 0)
>>> + {
>>> + __set_errno (EOPNOTSUPP);
>>> + return -1;
>>> + }
>>> +
>>> + return preadv64 (fd, vector, count, offset);
>>> +}
>>> +
>>> +#ifdef __OFF_T_MATCHES_OFF64_T
>>> +strong_alias (preadv64v2, preadv2)
>>> +#endif
>>> diff --git a/sysdeps/posix/pwritev2.c b/sysdeps/posix/pwritev2.c
>>> new file mode 100644
>>> index 0000000..5b7650c
>>> --- /dev/null
>>> +++ b/sysdeps/posix/pwritev2.c
>>> @@ -0,0 +1,38 @@
>>> +/* Generic version of pwritev2.
>>> + 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 <unistd.h>
>>> +#include <sys/uio.h>
>>> +
>>> +#ifndef __OFF_T_MATCHES_OFF64_T
>>> +
>>> +/* Since we define no flags for pwritev2 just route to pwritev. */
>>> +ssize_t
>>> +pwritev2 (int fd, const struct iovec *vector, int count, OFF_T offset,
>>> + int flags)
>>> +{
>>> + if (flags != 0)
>>> + {
>>> + __set_errno (EOPNOTSUPP);
>>> + return -1;
>>> + }
>>> +
>>> + return pwritev (fd, vector, count, offset);
>>> +}
>>> +
>>> +#endif
>>> diff --git a/sysdeps/posix/pwritev64v2.c b/sysdeps/posix/pwritev64v2.c
>>> new file mode 100644
>>> index 0000000..d9727b9
>>> --- /dev/null
>>> +++ b/sysdeps/posix/pwritev64v2.c
>>> @@ -0,0 +1,38 @@
>>> +/* Generic version of pwritev2.
>>> + 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 <unistd.h>
>>> +#include <sys/uio.h>
>>> +
>>> +/* Since we define no flags for pwritev2 just route to pwritev. */
>>> +ssize_t
>>> +pwritev64v2 (int fd, const struct iovec *vector, int count, OFF_T offset,
>>> + int flags)
>>> +{
>>> + if (flags != 0)
>>> + {
>>> + __set_errno (EOPNOTSUPP);
>>> + return -1;
>>> + }
>>> +
>>> + return pwritev64 (fd, vector, count, offset);
>>> +}
>>> +
>>> +#ifdef __OFF_T_MATCHES_OFF64_T
>>> +strong_alias (pwritev64v2, pwritev2)
>>> +#endif
>>> diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
>>> index 58d768c..296f2a5 100644
>>> --- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
>>> @@ -2097,3 +2097,8 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist
>>> index 906050d..8006e72 100644
>>> --- a/sysdeps/unix/sysv/linux/alpha/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist
>>> @@ -2008,6 +2008,11 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> GLIBC_2.3 GLIBC_2.3 A
>>> GLIBC_2.3 __ctype_b_loc F
>>> GLIBC_2.3 __ctype_tolower_loc F
>>> diff --git a/sysdeps/unix/sysv/linux/arm/libc.abilist b/sysdeps/unix/sysv/linux/arm/libc.abilist
>>> index 66112dd..29f9688 100644
>>> --- a/sysdeps/unix/sysv/linux/arm/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/arm/libc.abilist
>>> @@ -98,6 +98,11 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> GLIBC_2.4 GLIBC_2.4 A
>>> GLIBC_2.4 _Exit F
>>> GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
>>> diff --git a/sysdeps/unix/sysv/linux/bits/uio.h b/sysdeps/unix/sysv/linux/bits/uio.h
>>> index 1583f04..d5701f8 100644
>>> --- a/sysdeps/unix/sysv/linux/bits/uio.h
>>> +++ b/sysdeps/unix/sysv/linux/bits/uio.h
>>> @@ -69,4 +69,10 @@ extern ssize_t process_vm_writev (pid_t __pid, const struct iovec *__lvec,
>>> __END_DECLS
>>>
>>> # endif
>>> +
>>> +/* Flags for preadv2/pwritev2: */
>>> +#define RWF_HIPRI 0x00000001 /* High priority request. */
>>> +#define RWF_DSYNC 0x00000002 /* per-IO O_DSYNC. */
>>> +#define RWF_SYNC 0x00000004 /* per-IO O_SYNC. */
>>> +
>>> #endif
>>> diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
>>> index 3ddadd2..e9cfbaf 100644
>>> --- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
>>> @@ -1862,6 +1862,11 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> GLIBC_2.3 GLIBC_2.3 A
>>> GLIBC_2.3 __ctype_b_loc F
>>> GLIBC_2.3 __ctype_tolower_loc F
>>> diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
>>> index 977ab90..c6ad3c3 100644
>>> --- a/sysdeps/unix/sysv/linux/i386/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
>>> @@ -2020,6 +2020,11 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> GLIBC_2.3 GLIBC_2.3 A
>>> GLIBC_2.3 __ctype_b_loc F
>>> GLIBC_2.3 __ctype_tolower_loc F
>>> diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist
>>> index c7edb9a..d0055a2 100644
>>> --- a/sysdeps/unix/sysv/linux/ia64/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist
>>> @@ -1884,6 +1884,11 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> GLIBC_2.3 GLIBC_2.3 A
>>> GLIBC_2.3 __ctype_b_loc F
>>> GLIBC_2.3 __ctype_tolower_loc F
>>> diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h
>>> index b981466..8ee1af7 100644
>>> --- a/sysdeps/unix/sysv/linux/kernel-features.h
>>> +++ b/sysdeps/unix/sysv/linux/kernel-features.h
>>> @@ -137,3 +137,8 @@
>>> /* Support for SysV IPC through wired syscalls. All supported architectures
>>> either support ipc syscall and/or all the ipc correspondent syscalls. */
>>> #define __ASSUME_DIRECT_SYSVIPC_SYSCALLS 1
>>> +
>>> +/* Support for p{read,write}v2 was added in 4.6. However Linux default
>>> + implementation does not assume the __ASSUME_* and instead use a fallback
>>> + implementation based on p{read,write}v and returning an error for
>>> + non supported flags. */
>>> diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
>>> index 450be4e..3777676 100644
>>> --- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
>>> @@ -99,6 +99,11 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> GLIBC_2.4 GLIBC_2.4 A
>>> GLIBC_2.4 _Exit F
>>> GLIBC_2.4 _IO_2_1_stderr_ D 0x98
>>> diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
>>> index 9e016bd..8b1f80c 100644
>>> --- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
>>> @@ -1976,6 +1976,11 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> GLIBC_2.3 GLIBC_2.3 A
>>> GLIBC_2.3 __ctype_b_loc F
>>> GLIBC_2.3 __ctype_tolower_loc F
>>> diff --git a/sysdeps/unix/sysv/linux/microblaze/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/libc.abilist
>>> index 1a455be..d4db9a8 100644
>>> --- a/sysdeps/unix/sysv/linux/microblaze/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/microblaze/libc.abilist
>>> @@ -2097,3 +2097,8 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
>>> index 8eb5e66..f430bdb 100644
>>> --- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
>>> @@ -1951,6 +1951,11 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> GLIBC_2.3 GLIBC_2.3 A
>>> GLIBC_2.3 __ctype_b_loc F
>>> GLIBC_2.3 __ctype_tolower_loc F
>>> diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
>>> index 416d9ac..a4dca19 100644
>>> --- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
>>> @@ -1949,6 +1949,11 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> GLIBC_2.3 GLIBC_2.3 A
>>> GLIBC_2.3 __ctype_b_loc F
>>> GLIBC_2.3 __ctype_tolower_loc F
>>> diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
>>> index f4949e5..0814fa8 100644
>>> --- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
>>> @@ -1947,6 +1947,11 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> GLIBC_2.3 GLIBC_2.3 A
>>> GLIBC_2.3 __ctype_b_loc F
>>> GLIBC_2.3 __ctype_tolower_loc F
>>> diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
>>> index c7375ae..a0bdeff 100644
>>> --- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
>>> @@ -1942,6 +1942,11 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> GLIBC_2.3 GLIBC_2.3 A
>>> GLIBC_2.3 __ctype_b_loc F
>>> GLIBC_2.3 __ctype_tolower_loc F
>>> diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist
>>> index 724a0e3..b201290 100644
>>> --- a/sysdeps/unix/sysv/linux/nios2/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist
>>> @@ -2138,3 +2138,8 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
>>> index 2dc32b6..6e7ff24 100644
>>> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
>>> @@ -1980,6 +1980,11 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> GLIBC_2.3 GLIBC_2.3 A
>>> GLIBC_2.3 __ctype_b_loc F
>>> GLIBC_2.3 __ctype_tolower_loc F
>>> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
>>> index 5658109..19c7c7d 100644
>>> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
>>> @@ -1985,6 +1985,11 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> GLIBC_2.3 GLIBC_2.3 A
>>> GLIBC_2.3 __ctype_b_loc F
>>> GLIBC_2.3 __ctype_tolower_loc F
>>> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
>>> index c761221..e94ce38 100644
>>> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
>>> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
>>> @@ -2185,3 +2185,8 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
>>> index 265c769..f3daa33 100644
>>> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
>>> @@ -99,6 +99,11 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> GLIBC_2.3 GLIBC_2.3 A
>>> GLIBC_2.3 _Exit F
>>> GLIBC_2.3 _IO_2_1_stderr_ D 0xe0
>>> diff --git a/sysdeps/unix/sysv/linux/preadv.c b/sysdeps/unix/sysv/linux/preadv.c
>>> index 7d971cc..ecabc8c 100644
>>> --- a/sysdeps/unix/sysv/linux/preadv.c
>>> +++ b/sysdeps/unix/sysv/linux/preadv.c
>>> @@ -50,4 +50,6 @@ preadv (int fd, const struct iovec *vector, int count, off_t offset)
>>> # define OFF_T off_t
>>> # include <sysdeps/posix/preadv_common.c>
>>> # endif /* __ASSUME_PREADV */
>>> +
>>> +libc_hidden_def (preadv)
>>> #endif
>>> diff --git a/sysdeps/unix/sysv/linux/preadv2.c b/sysdeps/unix/sysv/linux/preadv2.c
>>> new file mode 100644
>>> index 0000000..11fe85e
>>> --- /dev/null
>>> +++ b/sysdeps/unix/sysv/linux/preadv2.c
>>> @@ -0,0 +1,55 @@
>>> +/* Linux implementation of preadv2.
>>> + 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 <sys/uio.h>
>>> +#include <sysdep-cancel.h>
>>> +
>>> +#ifndef __OFF_T_MATCHES_OFF64_T
>>> +
>>> +# if !defined (__NR_preadv2) && defined (__NR_pread64v2)
>>> +# define __NR_preadv2 __NR_pread64v2
>>> +# endif
>>> +
>>> +ssize_t
>>> +preadv2 (int fd, const struct iovec *vector, int count, off_t offset,
>>> + int flags)
>>> +{
>>> +# ifdef __NR_preadv2
>>> + ssize_t result = SYSCALL_CANCEL (preadv2, fd, vector, count,
>>> + LO_HI_LONG (offset), flags);
>>> + if (result >= 0 || errno != ENOSYS)
>>> + return result;
>>> +# endif
>>> + /* Trying to emulate the preadv2 syscall flags is troublesome:
>>> +
>>> + * We can not temporary change the file state of the O_DSYNC and O_SYNC
>>> + flags to emulate RWF_{D}SYNC (attempts to change the state of using
>>> + fcntl are silently ignored).
>>> +
>>> + * IOCB_HIPRI requires the file opened in O_DIRECT and uses an internal
>>> + semantic not provided by any other flag (O_NONBLOCK for instance). */
>>> +
>>> + if (flags != 0)
>>> + {
>>> + __set_errno (EOPNOTSUPP);
>>> + return -1;
>>> + }
>>> + return preadv (fd, vector, count, offset);
>>> +}
>>> +
>>> +#endif
>>> diff --git a/sysdeps/unix/sysv/linux/preadv64.c b/sysdeps/unix/sysv/linux/preadv64.c
>>> index 66daa74..c96b214 100644
>>> --- a/sysdeps/unix/sysv/linux/preadv64.c
>>> +++ b/sysdeps/unix/sysv/linux/preadv64.c
>>> @@ -48,7 +48,9 @@ preadv64 (int fd, const struct iovec *vector, int count, off64_t offset)
>>> # define OFF_T off64_t
>>> # include <sysdeps/posix/preadv_common.c>
>>> #endif
>>> +libc_hidden_def (preadv64)
>>>
>>> #ifdef __OFF_T_MATCHES_OFF64_T
>>> strong_alias (preadv64, preadv)
>>> +libc_hidden_def (preadv)
>>> #endif
>>> diff --git a/sysdeps/unix/sysv/linux/preadv64v2.c b/sysdeps/unix/sysv/linux/preadv64v2.c
>>> new file mode 100644
>>> index 0000000..9d7f8c9
>>> --- /dev/null
>>> +++ b/sysdeps/unix/sysv/linux/preadv64v2.c
>>> @@ -0,0 +1,55 @@
>>> +/* Linux implementation of preadv2 (LFS version).
>>> + 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 <sys/uio.h>
>>> +#include <sysdep-cancel.h>
>>> +
>>> +#if !defined(__NR_preadv64v2) && defined(__NR_preadv2)
>>> +# define __NR_preadv64v2 __NR_preadv2
>>> +#endif
>>> +
>>> +ssize_t
>>> +preadv64v2 (int fd, const struct iovec *vector, int count, off64_t offset,
>>> + int flags)
>>> +{
>>> +#ifdef __NR_preadv64v2
>>> + ssize_t result = SYSCALL_CANCEL (preadv64v2, fd, vector, count,
>>> + LO_HI_LONG (offset), flags);
>>> + if (result >= 0 || errno != ENOSYS)
>>> + return result;
>>> +#endif
>>> + /* Trying to emulate the preadv2 syscall flags is troublesome:
>>> +
>>> + * We can not temporary change the file state of the O_DSYNC and O_SYNC
>>> + flags to emulate RWF_{D}SYNC (attempts to change the state of using
>>> + fcntl are silently ignored).
>>> +
>>> + * IOCB_HIPRI requires the file opened in O_DIRECT and uses an internal
>>> + semantic not provided by any other flag (O_NONBLOCK for instance). */
>>> +
>>> + if (flags != 0)
>>> + {
>>> + __set_errno (EOPNOTSUPP);
>>> + return -1;
>>> + }
>>> + return preadv64 (fd, vector, count, offset);
>>> +}
>>> +
>>> +#ifdef __OFF_T_MATCHES_OFF64_T
>>> +strong_alias (preadv64v2, preadv2)
>>> +#endif
>>> diff --git a/sysdeps/unix/sysv/linux/pwrite64.c b/sysdeps/unix/sysv/linux/pwrite64.c
>>> index 57e5d20..71959c0 100644
>>> --- a/sysdeps/unix/sysv/linux/pwrite64.c
>>> +++ b/sysdeps/unix/sysv/linux/pwrite64.c
>>> @@ -28,6 +28,7 @@ __libc_pwrite64 (int fd, const void *buf, size_t count, off64_t offset)
>>> {
>>> return SYSCALL_CANCEL (pwrite64, fd, buf, count, SYSCALL_LL64_PRW (offset));
>>> }
>>> +
>>> weak_alias (__libc_pwrite64, __pwrite64)
>>> libc_hidden_weak (__pwrite64)
>>> weak_alias (__libc_pwrite64, pwrite64)
>>> diff --git a/sysdeps/unix/sysv/linux/pwritev.c b/sysdeps/unix/sysv/linux/pwritev.c
>>> index ce02996..7545cb3 100644
>>> --- a/sysdeps/unix/sysv/linux/pwritev.c
>>> +++ b/sysdeps/unix/sysv/linux/pwritev.c
>>> @@ -50,4 +50,6 @@ pwritev (int fd, const struct iovec *vector, int count, off_t offset)
>>> # define OFF_T off_t
>>> # include <sysdeps/posix/pwritev_common.c>
>>> # endif /* __ASSUME_PREADV */
>>> +
>>> +libc_hidden_def (pwritev)
>>> #endif
>>> diff --git a/sysdeps/unix/sysv/linux/pwritev2.c b/sysdeps/unix/sysv/linux/pwritev2.c
>>> new file mode 100644
>>> index 0000000..72f0471
>>> --- /dev/null
>>> +++ b/sysdeps/unix/sysv/linux/pwritev2.c
>>> @@ -0,0 +1,51 @@
>>> +/* Linux implementation of pwritev2.
>>> + 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 <sys/uio.h>
>>> +#include <sysdep-cancel.h>
>>> +
>>> +#ifndef __OFF_T_MATCHES_OFF64_T
>>> +
>>> +ssize_t
>>> +pwritev2 (int fd, const struct iovec *vector, int count, off_t offset,
>>> + int flags)
>>> +{
>>> +# ifdef __NR_pwritev2
>>> + ssize_t result = SYSCALL_CANCEL (pwritev2, fd, vector, count,
>>> + LO_HI_LONG (offset), flags);
>>> + if (result >= 0 || errno != ENOSYS)
>>> + return result;
>>> +# endif
>>> + /* Trying to emulate the pwritev2 syscall flags is troublesome:
>>> +
>>> + * We can not temporary change the file state of the O_DSYNC and O_SYNC
>>> + flags to emulate RWF_{D}SYNC (attempts to change the state of using
>>> + fcntl are silently ignored).
>>> +
>>> + * IOCB_HIPRI requires the file opened in O_DIRECT and uses an internal
>>> + semantic not provided by any other flag (O_NONBLOCK for instance). */
>>> +
>>> + if (flags != 0)
>>> + {
>>> + __set_errno (EOPNOTSUPP);
>>> + return -1;
>>> + }
>>> + return pwritev (fd, vector, count, offset);
>>> +}
>>> +
>>> +#endif
>>> diff --git a/sysdeps/unix/sysv/linux/pwritev64.c b/sysdeps/unix/sysv/linux/pwritev64.c
>>> index 45fb90b..9dc4e55 100644
>>> --- a/sysdeps/unix/sysv/linux/pwritev64.c
>>> +++ b/sysdeps/unix/sysv/linux/pwritev64.c
>>> @@ -48,7 +48,9 @@ pwritev64 (int fd, const struct iovec *vector, int count, off64_t offset)
>>> # define OFF_T off64_t
>>> # include <sysdeps/posix/pwritev_common.c>
>>> #endif
>>> +libc_hidden_def (pwritev64)
>>>
>>> #ifdef __OFF_T_MATCHES_OFF64_T
>>> strong_alias (pwritev64, pwritev)
>>> +libc_hidden_def (pwritev)
>>> #endif
>>> diff --git a/sysdeps/unix/sysv/linux/pwritev64v2.c b/sysdeps/unix/sysv/linux/pwritev64v2.c
>>> new file mode 100644
>>> index 0000000..def9a0b
>>> --- /dev/null
>>> +++ b/sysdeps/unix/sysv/linux/pwritev64v2.c
>>> @@ -0,0 +1,55 @@
>>> +/* Linux implementation of pwritev2 (LFS version).
>>> + 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 <sys/uio.h>
>>> +#include <sysdep-cancel.h>
>>> +
>>> +#if !defined(__NR_pwritev64v2) && defined(__NR_pwritev2)
>>> +# define __NR_pwritev64v2 __NR_pwritev2
>>> +#endif
>>> +
>>> +ssize_t
>>> +pwritev64v2 (int fd, const struct iovec *vector, int count, off64_t offset,
>>> + int flags)
>>> +{
>>> +#ifdef __NR_pwritev64v2
>>> + ssize_t result = SYSCALL_CANCEL (pwritev64v2, fd, vector, count,
>>> + LO_HI_LONG (offset), flags);
>>> + if (result >= 0 || errno != ENOSYS)
>>> + return result;
>>> +#endif
>>> + /* Trying to emulate the pwritev2 syscall flags is troublesome:
>>> +
>>> + * We can not temporary change the file state of the O_DSYNC and O_SYNC
>>> + flags to emulate RWF_{D}SYNC (attempts to change the state of using
>>> + fcntl are silently ignored).
>>> +
>>> + * IOCB_HIPRI requires the file opened in O_DIRECT and uses an internal
>>> + semantic not provided by any other flag (O_NONBLOCK for instance). */
>>> +
>>> + if (flags != 0)
>>> + {
>>> + __set_errno (EOPNOTSUPP);
>>> + return -1;
>>> + }
>>> + return pwritev64 (fd, vector, count, offset);
>>> +}
>>> +
>>> +#ifdef __OFF_T_MATCHES_OFF64_T
>>> +strong_alias (pwritev64v2, pwritev2)
>>> +#endif
>>> diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
>>> index ed1b6bf..eb9e72f 100644
>>> --- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
>>> @@ -1980,6 +1980,11 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> GLIBC_2.3 GLIBC_2.3 A
>>> GLIBC_2.3 __ctype_b_loc F
>>> GLIBC_2.3 __ctype_tolower_loc F
>>> diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
>>> index 2e75d29..1402959 100644
>>> --- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
>>> @@ -1881,6 +1881,11 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> GLIBC_2.3 GLIBC_2.3 A
>>> GLIBC_2.3 __ctype_b_loc F
>>> GLIBC_2.3 __ctype_tolower_loc F
>>> diff --git a/sysdeps/unix/sysv/linux/sh/libc.abilist b/sysdeps/unix/sysv/linux/sh/libc.abilist
>>> index bd74c0c..e9eefcb 100644
>>> --- a/sysdeps/unix/sysv/linux/sh/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/sh/libc.abilist
>>> @@ -1866,6 +1866,11 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> GLIBC_2.3 GLIBC_2.3 A
>>> GLIBC_2.3 __ctype_b_loc F
>>> GLIBC_2.3 __ctype_tolower_loc F
>>> diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
>>> index 5584838..967699e 100644
>>> --- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
>>> @@ -1972,6 +1972,11 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> GLIBC_2.3 GLIBC_2.3 A
>>> GLIBC_2.3 __ctype_b_loc F
>>> GLIBC_2.3 __ctype_tolower_loc F
>>> diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
>>> index efedbe2..9dd938a 100644
>>> --- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
>>> @@ -1910,6 +1910,11 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> GLIBC_2.3 GLIBC_2.3 A
>>> GLIBC_2.3 __ctype_b_loc F
>>> GLIBC_2.3 __ctype_tolower_loc F
>>> diff --git a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist
>>> index ffd988a..68c9887 100644
>>> --- a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist
>>> @@ -2104,3 +2104,8 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> diff --git a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist
>>> index f0c13ce..97aa0f7 100644
>>> --- a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist
>>> @@ -2104,3 +2104,8 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> diff --git a/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist b/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist
>>> index ffd988a..68c9887 100644
>>> --- a/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist
>>> @@ -2104,3 +2104,8 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
>>> index f57004c..2032659 100644
>>> --- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
>>> @@ -1861,6 +1861,11 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>> GLIBC_2.3 GLIBC_2.3 A
>>> GLIBC_2.3 __ctype_b_loc F
>>> GLIBC_2.3 __ctype_tolower_loc F
>>> diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
>>> index 05629e1..11a278c 100644
>>> --- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
>>> +++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
>>> @@ -2104,3 +2104,8 @@ GLIBC_2.25 getrandom F
>>> GLIBC_2.25 strfromd F
>>> GLIBC_2.25 strfromf F
>>> GLIBC_2.25 strfroml F
>>> +GLIBC_2.26 GLIBC_2.26 A
>>> +GLIBC_2.26 preadv2 F
>>> +GLIBC_2.26 preadv64v2 F
>>> +GLIBC_2.26 pwritev2 F
>>> +GLIBC_2.26 pwritev64v2 F
>>>