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Date: Sat, 18 Dec 2021 12:14:15 -0500
From: Rich Felker <dalias@...c.org>
To: Markus Wichmann <nullplan@....net>
Cc: musl@...ts.openwall.com
Subject: Re: Feasibility of FD_CLOEXEC on all streams
On Sat, Dec 18, 2021 at 05:33:20PM +0100, Markus Wichmann wrote:
> Hi all,
>
> I was recently reading the source code of popen(), and noticed that it
> has to iterate over all open files to close all the open pipe FDs the
> child might inherit. And that made me wonder:
>
> 1. Does POSIX allow for all FILE streams to have FD_CLOEXEC applied by
> default?
No. Accessing fileno(f) is permissible subject to following the rules
for active handle:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html#tag_15_05_01
and that entails being able to use them according to the rules for how
fds are inherited across exec.
Rich
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