Re: Python (was Re: I did not inhale)

On Sun, 25 Aug 2024 12:32:10 +0200, "Dmitry A. Kazakov"
<mailbox@dmitry-kazakov.de> wrote in <vaf179$1rnhl$1@dont-email.me>:

On 2024-08-25 09:50, Sebastian wrote:

In comp.unix.programmer Dmitry A. Kazakov <mailbox@dmitry-kazakov.de>
wrote:

Windows did many things wrong, but accessing file descriptors by
numbers is beyond even Windows. In Windows a file is an OS object. You
access it getting an opaque handle to. Note that a handle can be
marshaled from one process to another. Try that with process-local
numbers!

 
UNIX domain sockets support the passing of file descriptors between
processes.

 
File descriptor (a pointer to) is not file number.
 
You cannot pass number 1 simply because 1 is already in use.

On this Linux system, "man 7 unix", in the section
"SCM_RIGHTS", it explains how the passing mechanism
is handled.  One paragraph reads:

              Commonly, this operation is referred to as "passing  a
              file  descriptor"  to  another process.  However, more
              accurately, what is being passed is a reference to  an
              open  file  description  (see open(2)), and in the re‐
              ceiving process it is likely that a different file de‐
              scriptor  number will be used.  Semantically, this op‐
              eration is equivalent to duplicating (dup(2))  a  file
              descriptor  into  the file descriptor table of another
              process.

--
-v