[fpc-pascal] POpen en PClose

[Marco van de Voort]

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.