[fpc-pascal] POpen en PClose

[Michael Van Canneyt]

On Mon, 20 Jul 2026, Marco van de Voort via fpc-pascal wrote:

>
> Op 20-7-2026 om 10:13 schreef Adriaan van Os via fpc-pascal:
>> 
>> I am looking at the implementation of POpen and PClose in the 
>> runtime-library for Darwin (or more general for UNIX). It seems like it 
>> doesn't call into libc popen and pclose, but instead follows its own 
>> implementation in unix.pp in POpen_internal. I am just curious to know the 
>> reason.
>> 
> Phew, that was over twenty years ago, but afaik the reason is that libc popen 
> and pclose us C FILE descriptors, which the RTL in general doesn't use to 
> avoid a mix of functions with pascal and C file types.
>
> So popen/pclose are a more high level (FILE * using) part of libc, while we 
> tend to only use the basis.

Glad our memories agree on this :-)

Michael.