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<a href="https://gitlab.com/rockdaboot">Tim Rühsen</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/809#note_119183599">tests/scripts/common.sh</a>:
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="shell"><span class="o" style="font-weight: 600;">}</span></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="shell"></span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="shell"><span class="c" style="color: #998; font-style: italic;"># Find a port number not currently in use.</span></span>
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<pre style="margin: 0;">-<span id="LC62" class="line" lang="shell"><span class="nv" style="color: teal;">GETPORT</span><span class="o" style="font-weight: 600;">=</span><span class="s1" style="color: #d14;">'rc=0; myrandom=$(date +%N | sed s/^0*//)</span></span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="shell"><span class="nv" style="color: teal;">GETPORT</span><span class="o" style="font-weight: 600;">=</span><span class="s1" style="color: #d14;">'rc=0; unset myrandom</span></span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="shell"><span class="s1" style="color: #d14;"> if test -n "$RANDOM"; then myrandom=$(($RANDOM + $RANDOM)); fi</span></span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="shell"><span class="s1" style="color: #d14;"> if test -z "$myrandom"; then myrandom=$(date +%N | sed s/^0*//); fi</span></span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="shell"><span class="s1" style="color: #d14;"> if test -z "$myrandom"; then myrandom=0; fi</span></span>
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<p dir="auto">That's a fallback in case we can't get a random value. It means that we try getting an unused port based starting at <code>PID % 63001 + 2000</code>, which is IMO quite OK.</p>
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