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[Octave-bug-tracker] [bug #32319] GL2PS error: Bad file pointer


From: Michael Godfrey
Subject: [Octave-bug-tracker] [bug #32319] GL2PS error: Bad file pointer
Date: Tue, 01 Feb 2011 18:28:30 +0000
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.13) Gecko/20110103 Fedora/3.6.13-1.fc14 Firefox/3.6.13

URL:
  <http://savannah.gnu.org/bugs/?32319>

                 Summary: GL2PS error: Bad file pointer
                 Project: GNU Octave
            Submitted by: godfrey
            Submitted on: Tue 01 Feb 2011 06:28:29 PM GMT
                Category: Plotting with OpenGL
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Crash
                  Status: None
             Assigned to: None
         Originator Name: Michael Godfrey
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

    _______________________________________________________

Details:

I thought that there was an outstanding report on this, but I
could not find it.  In any case, I have tested this problem
and it still happens when fltk plotting is used over a remote
connection or a connection such that graphics rendering takes
too long.  This has been a long standing failure.  But, I
have an interim suggestion:

The failure now occurs at line 5650 of gl2ps.c:
    gl2psMsg(GL2PS_ERROR, "Bad file pointer");
    gl2psFree(gl2ps);
    gl2ps = NULL;
    return GL2PS_ERROR;
==========================
However, the specific cause is at line 46 of gl2ps-renderer.cc:
      FILE *fp = fdopen (fid, "wb");
============================
It is the fact that fdopen returns NULL that causes the failure.
Would it be better to test for fp == NULL at this point and if
possible make a non-fatal return?  This would be better than the
current SEG FAULT which loses any current work.

I have attached a bt of the current failure.  And, I will
try to learn more about the cause of this problem, but I
know little about OpenGL.

Michael




    _______________________________________________________

File Attachments:


-------------------------------------------------------
Date: Tue 01 Feb 2011 06:28:29 PM GMT  Name: fltk_bad_pointer  Size: 3kB  
By: godfrey

<http://savannah.gnu.org/bugs/download.php?file_id=22582>

    _______________________________________________________

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