[Bugs] [Bug 1331759] runner: extract and return actual exit status of child

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1331759



--- Comment #2 from Vijay Bellur <vbellur at redhat.com> ---
COMMIT: http://review.gluster.org/14116 committed in release-3.7 by Atin
Mukherjee (amukherj at redhat.com) 
------
commit d6b406b84dd840d15472b203052f7679d96dc321
Author: Prasanna Kumar Kalever <prasanna.kalever at redhat.com>
Date:   Fri Apr 29 18:28:20 2016 +0530

    runner: extract and return actual exit status of child

    Intro:
    pid_t waitpid(pid_t pid, int *status, int options);

    The waitpid() system call suspends execution of the calling process
    until a child specified by pid  argument has  changed  state.

    Here the ret (pid) value is not equal to the exit status of the child
process.
    Check manpages for more info on this.

    Problem:
    In the current runner framework we always return the pid i.e ret value
    of the waitpid, as said above it is not the exit value of the child process

    Solution:
    Extract the actual exit code/status in case if the child terminated
normally,
    that is, by calling exit(3) or _exit(2), or by returning from main()

    Backport of:
    > Change-Id: Iffae99a43e540af66917b3745f21ea3c2a5a3c2d
    > BUG: 1329129
    > Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever at redhat.com>
    > Reviewed-on: http://review.gluster.org/14042
    > Tested-by: Prasanna Kumar Kalever <pkalever at redhat.com>
    > Reviewed-by: Kaleb KEITHLEY <kkeithle at redhat.com>
    > CentOS-regression: Gluster Build System <jenkins at build.gluster.com>
    > NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    > Smoke: Gluster Build System <jenkins at build.gluster.com>
    > Reviewed-by: Jeff Darcy <jdarcy at redhat.com>

    Change-Id: I137b2fc120ec2b1137bf8a4e6b180f1787bf5908
    BUG: 1331759
    Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever at redhat.com>
    Reviewed-on: http://review.gluster.org/14116
    Tested-by: Prasanna Kumar Kalever <pkalever at redhat.com>
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.com>
    Smoke: Gluster Build System <jenkins at build.gluster.com>
    Reviewed-by: Kaleb KEITHLEY <kkeithle at redhat.com>

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