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5.6.2 RedHat 4.0 – Problem With exec Within tcl

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  • April 3, 2009 at 3:00 pm #50768
    Bob Moriarty
    Participant

      Greetings,

      Moving from 5.3.2 on RedHat 3.0 to 5.6.2 on RedHat 4.0.

      I’ve noticed that tcl now complains when exec-ing a PostScript-to-PDF file conversion utility in /usr/bin. A converted file does get created but tcl reports an error.  Running the utility from the commandline shows no error. Both of the output PDFs are viewable but they differ in length by one byte.

      This worked OK in 5.3.2 on RedHat 3.0

      TIA for thoughts or solutions.

      #>ls -l 123.ps

      -rw-r–r–  1 hci staff 13762 Apr  3 10:26 123.ps

      #>tcl

      tcl>exec convert 123.ps aaa.pdf

      Error: child process exited abnormally

      tcl>exit

      #>ls -l aaa.pdf

      -rw-rw-r–  1 hci staff 46881 Apr  3 10:38 aaa.pdf

      #>convert 123.ps bbb.pdf

      #>ls -l [ab]*.pdf

      -rw-rw-r–  1 hci staff 46881 Apr  3 10:38 aaa.pdf

      -rw-rw-r–  1 hci staff 46880 Apr  3 10:39 bbb.pdf

      #>diff aaa.pdf bbb.pdf

      Binary files aaa.pdf and bbb.pdf differ

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      • April 3, 2009 at 4:15 pm #67449
        David Barr
        Participant

          Your script is probably exiting with a non-zero result code.  There are some TCL variables you can look at to see the cause of the exec failure.  You can also check the exit status of your script when you run it outside of TCL.

          Code:

          $ hcitcl
          hcitcl>exec ./test.sh
          Error: child process exited abnormally
          hcitcl>echo $errorCode
          CHILDSTATUS 16872 1
          hcitcl>exit
          $ ./test.sh
          $ echo $?
          1
          $

        • April 3, 2009 at 4:57 pm #67450
          David Barr
          Participant

            Also, I’m not sure if this “convert” script is something that you guys wrote.  It might be the “convert” command from ImageMagick.  You could try using the “-verbose” flag to see if it prints any messages about abnormal activity.

          • April 3, 2009 at 6:18 pm #67451
            Bob Moriarty
            Participant

              Thanks for the suggestions David.

              Yes, this is the ImageMagick convert. And yes, using your code I can see a non-zero exit code in both the unix and tcl shells.

              Thanks much!

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