[Bug binutils/22555] New: readelf exit status is 0 for empty zero-length file

[mstahl at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=22555

            Bug ID: 22555
           Summary: readelf exit status is 0 for empty zero-length file
           Product: binutils
           Version: 2.29
            Status: NEW
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: mstahl at redhat dot com
  Target Milestone: ---

from Fedora 26 to Fedora 27, the readelf exit status changed from 1
to 0 when running "readelf -d" on an empty file:

old:

> touch /tmp/foo
> readelf -d /tmp/foo 
readelf: /tmp/foo: Error: Failed to read file's magic number
> echo $?
1
> readelf --version
GNU readelf version 2.27-28.fc26
Copyright (C) 2016 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) any later version.
This program has absolutely no warranty.

new:

> touch /tmp/foo
> readelf -d /tmp/foo
readelf: /tmp/foo: Error: Failed to read file's magic number
> echo $?
0
> readelf --version
GNU readelf version 2.29-6.fc27
Copyright (C) 2017 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) any later version.
This program has absolutely no warranty.


but readelf still prints an error - so i think it should not exit with 0.

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