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<a href="https://gitlab.com/Courmisch">Remi Denis-Courmont</a>
commented:
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<p dir="auto">As far as I know, there are two ways to solve this (and none else):</p>
<ul dir="auto">
<li>use the "e" flag to <code>fopen()</code> (specified in POSIX.next if I understood correctly, originating in glibc), or</li>
<li>use <code>open() with the </code>O_CLOEXEC<code>flag followed by</code>fdopen()` (specified in POSIX.2008 already).</li>
</ul>
<p dir="auto">As to portability, you have four cases:</p>
<ol dir="auto">
<li>The OS does not support <code>fork()</code> (e.g. Windows): no need to do anything.</li>
<li>The OS supports <code>fork()</code>, lacks POSIX.2008: this is broken beyond repair.</li>
<li>The OS supports <code>fork()</code> and POSIX.2008: using <code>open()</code> then <code>fdopen()</code> is the only solution.</li>
<li>The OS supports both solutions.</li>
</ol>
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