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From: "eru at netti dot fi" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/27883] New: The memusage script does not work if
 LD_PRELOAD used also for other purposes
Date: Tue, 18 May 2021 08:27:38 +0000
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X-Bugzilla-Version: 2.32
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27883

            Bug ID: 27883
           Summary: The memusage script does not work if LD_PRELOAD used
                    also for other purposes
           Product: glibc
           Version: 2.32
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: eru at netti dot fi
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

The memusage script uses LD_PRELOAD to inject libmemusage.so at start-up.
However, it completely overrides the variable, which causes problems, if the
user also needs to define the variable to add other .so files. (Happened in=
 a
testing framework I am using). One possible fix:

if [[ "${LD_PRELOAD:-UNSET}" =3D "UNSET" ]]; then
  add_env=3D"LD_PRELOAD=3D$memusageso"
else
  add_env=3D"LD_PRELOAD=3D${LD_PRELOAD}:$memusageso"
fi

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