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Michael Gage - inappropriate ioctl error

Michael Gage - inappropriate ioctl error

by Arnold Pizer -
Number of replies: 0
inactiveTopicinappropriate ioctl error topic started 8/19/2004; 10:41:09 AM
last post 8/25/2004; 1:23:58 PM
userMichael Gage - inappropriate ioctl error  blueArrow
8/19/2004; 10:41:09 AM (reads: 1467, responses: 1)
I have found the following error on some machines: 


cd /usr/local/webwork/webwork2/tmp/ImageGenerator.zFDShKtW && 
/usr/local/bin/dvipng -x4000.5 -bgTransparent -Q6 -mode toshiba -D180 
equation > dvipng.out 2> dvipng.err 
returned non-zero status 256: 
Inappropriate ioctl for device at /usr/local/webwork/pg/lib/WeBWorK/PG/ImageGenerator.pm line 361.



I have seen this error in cases where the image was created perfectly.  It seems that on some installations 256 is returned
instead of 0 on successful completion of the dvipng process. (???) 


Changing lines 361 and 362 to 

	warn "$dvipngCommand returned non-zero status $dvipngStatus: $!"
		if $dvipngStatus and $dvipngStatus !=256;  # some installations return 256? FIXME




Seems to work, but I would like to have a clearer explanation of what is going wrong.


Can someone who knows more about dvipng help out?
(See also the webworkFAQ http://devel.webwork.rochester.edu/twiki/bin/view/Webwork/ImageGenerationErrorIoctl )


-- Mike
 

            
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userJohn Jones - Re: inappropriate ioctl error  blueArrow
8/25/2004; 1:23:58 PM (reads: 1748, responses: 
            0) 		
        
I think this is highly dependent on the version of dvipng.  Do you see this with version 1.0?

One thing which may be worth testing is to see if it makes a difference
where the dvipng executable is. I get warnings about not being able to
find some font related components of TeX unless I put the executable in
.../texmf/bin . Does moving it there (and updating webwork's
configuration to find it) change the exit code?


John 
            

            
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