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how to determine number of open files

SnakesForBrains
Prodigy 110 points
Other Parts Discussed in Thread: TMS320VC5505

hi all,

 

I'm using a TMS320Vc5505 eZdsp USB stick with Code Composer Version: 4.0.0.16000 

I've determined that the maximum number of open files allowed by the system (via stdio's fopen) is 10; you can use this code snippet to verify:

    printf("Max number of files: FOPEN_MAX=(%d)\n",FOPEN_MAX);

 

My question is:  is there any way to determine how many files are currently open?

 

thanks!

-Rob

 

  • 0
    TI__Guru**** 249520 points

    There is no standard C RTS function you can call which tells you the number of currently open files.  There might be some very system specific not portable way to do it.  But I highly advise against any hack like that.

    Thanks and regards,

    -George

     

  • 0 in reply to George Mock
    Prodigy 110 points

    Thanks Georgem.  I'm aware that there's no platform-independent way to do this, but I was hoping somebody would have a hack just for my Code Composer setup--especially given its smaller-than-usual file limit.

     

  • 0 in reply to SnakesForBrains
    TI__Guru* 84285 points

    You could modify the RTS source file fopen.c to add a function which iterates through the internal C I/O structure counting assigned FILE slots.  See _search_fp() in particular. 

    However, if you're willing to modify the RTS source, you would probably be better served just changing the definition of _NFILE in stdio.h and recompiling the RTS.

    Note that the reason there's no standard function is that it's of limited utility; it's easier to keep track of how many files you've opened, and add 3 for stdin, stdout, and stderr.

  • 0 in reply to Archaeologist
    Prodigy 110 points

    thanks, Archaeologist.  Useful advice.  It occurred to me that I could also "overload" fopen and fclose to count the number of times it opens and closes a file.

     

    I agree that it's easy enough to count how many files _I've_ personally opened, but I'm trying to gain visibility into how many files _everybody else_ have opened.

     

  • 0 in reply to SnakesForBrains
    Prodigy 110 points

    I wanted to start looking at the RTS source code files mentioned above, but I don't see the rts.src archive anywhere in my c:\Program Files\Texas Instruments installation (I have the CCSv4 installation which came with my C5505 EZDSP).   

    Did I miss an installation step?  Am I supposed to download it from elsewhere?

     

  • 0 in reply to SnakesForBrains
    Prodigy 110 points

    Ah, I found the source code in a zip file:

    C:\Program Files\Texas Instruments\ccsv4\tools\compiler\c5500\lib\rtssrc.zip