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[Bug libc/22321] sysconf(_SC_IOV_MAX) returns -1 on Linux

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The branch, release/2.26/master has been updated
       via  2e78ea7a207e49a47a3448fbbc387d606141ec9d (commit)
      from  05155f0772a4befcc10da16ab64060ae7836ff7c (commit)

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- Log -----------------------------------------------------------------;h=2e78ea7a207e49a47a3448fbbc387d606141ec9d

commit 2e78ea7a207e49a47a3448fbbc387d606141ec9d
Author: Florian Weimer <>
Date:   Fri Oct 20 04:10:15 2017 +0200

    sysconf: Fix missing definition of UIO_MAXIOV on Linux [BZ #22321]

    After commit 37f802f86400684c8d13403958b2c598721d6360 (Remove
    __need_IOV_MAX and __need_FOPEN_MAX), UIO_MAXIOV is no longer supplied
    (indirectly) through <bits/stdio_lim.h>, so sysdeps/posix/sysconf.c no
    longer sees the definition.

    (cherry picked from commit 63b4baa44e8d22501c433c4093aa3310f91b6aa2)


Summary of changes:
 ChangeLog                                          |   10 ++++++
 NEWS                                               |    1 +
 sysdeps/posix/sysconf.c                            |    1 +
 sysdeps/unix/sysv/linux/Makefile                   |    8 +++-
 .../unix/sysv/linux/tst-sysconf-iov_max-uapi.c     |   13 +++----
 .../unix/sysv/linux/tst-sysconf-iov_max.c          |   33 ++++++++-----------
 6 files changed, 38 insertions(+), 28 deletions(-)
 copy support/xpipe.c => sysdeps/unix/sysv/linux/tst-sysconf-iov_max-uapi.c
 copy debug/tst-ssp-1.c => sysdeps/unix/sysv/linux/tst-sysconf-iov_max.c (59%)

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