[GRASS-dev] opencell opening temp null file: no temp files available

[Andruit at gmx.de]

It seems that the files are not closed, but I use

    if((elev_fd = G_open_cell_old (name, mapset)) < 0)
    G_fatal_error( _("can't open %s"), name);
   
    if((output_fd = G_open_cell_new(outname)) < 0)
    G_fatal_error( _("can't open outname %s"), outname);

to open the files and

    G_close_cell(output_fd);
    G_close_cell(elev_fd);

to close the files again.

Is there anything wrong?

Andi

Glynn Clements wrote:
> Andruit at gmx.de wrote:
>
>> I am writing a Grass programm which creates a raster, reads the values
>> of the raster map at certain points and creates a new rastermap having
>> the same name as the old one.
>>
>> I am using the function
>>
>> G_open_cell_new()  to overwrite the existing raster map.
>>
>> and the function
>>
>>  G_close_cell()
>>
>>
>> It works fine.
>>
>> But after about 1000 loops I get the following messsage.
>>
>> WARNING: opencell opening temp null file: no temp files available
>>
>> Does anyone know what it means. I have enough space left in my ./tmp
>> folder. And I also have write permissions on it.
>
> It probably means that files aren't getting closed, so you are
> exceeding the limit on the number of open files per process (by
> default 1024, check with ulimit -n).
>
> On Linux, you can check which files a process has open by looking in
> the /proc/<pid>/fd directory, where <pid> is the PID of the process.
>
> If you're modifying a map "in-place", you'll need to close and re-open
> the input map in order to see the changes. Opening a map for write
> creates a temporary file, which is renamed over the original when
> closed. If the original cell/fcell file is still open for read at that
> point, it will still exist and still be open (it will show up as
> "(deleted)" in /proc/<pid>/fd).
>


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