Op 20-7-2026 om 11:57 schreef Michael Van Canneyt 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 :-)
Well aside from the fact that FreeBSD was the architecture where the
baseunix/unix RTL was done. The port to Linux was only done later :-)
This shows the tension a bit between libc the system lib, and libc the C
runtime. We are only interested in the system lib part.
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