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From: vallor <vallor@cultnix.org>
Newsgroups: comp.unix.shell,comp.unix.programmer,comp.lang.misc
Subject: Re: Python (was Re: I did not inhale)
Date: Sun, 25 Aug 2024 13:41:50 -0000 (UTC)
Organization: A noiseless patient Spider
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References: <uu54la$3su5b$6@dont-email.me> <87il0lldf8.fsf@tudado.org>
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<vaennp$1q5l3$2@dont-email.me> <vaf179$1rnhl$1@dont-email.me>
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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