[Bug libc/16364] sleep may leave SIGCHLD blocked on sync cancellation on GNU/Linux

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https://sourceware.org/bugzilla/show_bug.cgi?id=16364

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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8c873bf0190740ac1102e13ff7aeb6c08048abfd

commit 8c873bf0190740ac1102e13ff7aeb6c08048abfd
Author: Adhemerval Zanella <adhemerval.zanella@linaro.com>
Date:   Sun Nov 8 20:06:42 2015 -0200

    Remove signal handling for nanosleep (bug 16364)

    Linux 2.6.32 and forward do not show the issue regarding SysV SIGCHLD
    vs. SIG_IGN for nanosleep which make it feasible to use it for sleep
    implementation without requiring any hacking to handle the spurious
    wake up.  The issue is likely being fixed before 2.6 and git
    history [1] [2].

    This patch simplifies the sleep code to call nanosleep directly by
    using the posix default version.  It also removes the early cancellation
    tests for zero argument, since nanosleep will handle cancellation
    in this case.

    [1] https://lkml.org/lkml/2004/11/25/5
    [2] https://lkml.org/lkml/2003/11/8/50

    Checked on x86_64, ppc64le, and aarch64.

        [BZ #16364]
        * sysdeps/unix/sysv/linux/sleep.c: Remove file
        * sysdeps/posix/sleep.c (__sleep): Simplify cancellation handling.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                       |    6 ++
 sysdeps/posix/sleep.c           |    9 ---
 sysdeps/unix/sysv/linux/sleep.c |  149 ---------------------------------------
 3 files changed, 6 insertions(+), 158 deletions(-)
 delete mode 100644 sysdeps/unix/sysv/linux/sleep.c

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