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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/commit/7c03462269ddd7c6a8753c6f8796438e40193f2d#note_852536732">lib/record.c</a>:
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<td class="new_line diff-line-num new" data-linenumber="2190" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2190
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC2190" class="line" lang="c"> <span class="n" style="color: #333;">data_to_send</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ret</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="2191" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2191
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC2191" class="line" lang="c"> <span class="k" style="font-weight: 600;">while</span> <span class="p">(</span><span class="n" style="color: #333;">data_to_send</span> <span class="o" style="font-weight: 600;">></span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">{</span></span>
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<td class="new_line diff-line-num new" data-linenumber="2192" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2192
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC2192" class="line" lang="c"> <span class="n" style="color: #333;">ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">gnutls_record_send</span><span class="p">(</span><span class="n" style="color: #333;">session</span><span class="p">,</span> <span class="n" style="color: #333;">buf</span><span class="p">,</span> <span class="n" style="color: #333;">data_to_send</span><span class="p">);</span></span>
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<td class="new_line diff-line-num new" data-linenumber="2193" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2193
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC2193" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">ret</span> <span class="o" style="font-weight: 600;"><</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">{</span></span>
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<td class="new_line diff-line-num new" data-linenumber="2194" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2194
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC2194" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">ret</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">GNUTLS_E_INTERRUPTED</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">ret</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">GNUTLS_E_AGAIN</span><span class="p">)</span></span>
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<td class="new_line diff-line-num new" data-linenumber="2195" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2195
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC2195" class="line" lang="c"> <span class="k" style="font-weight: 600;">continue</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="2196" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2196
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC2196" class="line" lang="c"> <span class="k" style="font-weight: 600;">else</span></span>
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<td class="new_line diff-line-num new" data-linenumber="2197" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2197
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC2197" class="line" lang="c"> <span class="k" style="font-weight: 600;">goto</span> <span class="n" style="color: #333;">end</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="2198" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2198
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC2198" class="line" lang="c"> <span class="p">}</span></span>
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<td class="new_line diff-line-num new" data-linenumber="2199" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2199
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC2199" class="line" lang="c"> <span class="n" style="color: #333;">data_to_send</span> <span class="o" style="font-weight: 600;">-=</span> <span class="n" style="color: #333;">ret</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="2200" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2200
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC2200" class="line" lang="c"> <span class="p">}</span></span>
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<td class="new_line diff-line-num new" data-linenumber="2201" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2201
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC2201" class="line" lang="c"> <span class="n" style="color: #333;">send</span> <span class="o" style="font-weight: 600;">+=</span> <span class="n" style="color: #333;">ret</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="2202" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2202
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC2202" class="line" lang="c"> <span class="p">}</span></span>
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<td class="new_line diff-line-num new" data-linenumber="2203" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2203
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC2203" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">offset</span> <span class="o" style="font-weight: 600;">!=</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">){</span></span>
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<td class="new_line diff-line-num new" data-linenumber="2204" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2204
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC2204" class="line" lang="c"> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">offset</span> <span class="o" style="font-weight: 600;">+=</span> <span class="n" style="color: #333;">send</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="2205" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2205
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC2205" class="line" lang="c"> <span class="n" style="color: #333;">lseek</span><span class="p">(</span><span class="n" style="color: #333;">fd</span><span class="p">,</span> <span class="o" style="font-weight: 600;">-</span><span class="p">(</span><span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">offset</span><span class="p">),</span> <span class="n" style="color: #333;">SEEK_CUR</span><span class="p">);</span></span>
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<p dir="auto">Perhaps you could save the offset at the first <code>lseek</code> and restore it with SEEK_SET?</p>
<div class="gl-relative markdown-code-block js-markdown-code">
<pre class="code highlight js-syntax-highlight language-c" lang="c" v-pre="true" style="border-radius: 2px; background-color: #fff; font-family: monospace; font-size: 90%; -premailer-cellpadding: 0; -premailer-cellspacing: 0; -premailer-width: 100%; margin: 0 0 8px; padding: 8px 12px; border: 1px solid #dbdbdb;"><code><span id="LC1" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">off_t</span> <span class="n" style="color: #333;">save_offset</span><span class="p">;</span></span>
<span id="LC2" class="line" lang="c"><span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">offset</span><span class="p">)</span> <span class="p">{</span></span>
<span id="LC3" class="line" lang="c"> <span class="n" style="color: #333;">save_offset</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lseek</span><span class="p">(</span><span class="n" style="color: #333;">fd</span><span class="p">,</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">offset</span><span class="p">,</span> <span class="n" style="color: #333;">SEEK_CUR</span><span class="p">);</span></span>
<span id="LC4" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// error handling</span></span>
<span id="LC5" class="line" lang="c"><span class="p">}</span></span>
<span id="LC6" class="line" lang="c"></span>
<span id="LC7" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// read from fd</span></span>
<span id="LC8" class="line" lang="c"></span>
<span id="LC9" class="line" lang="c"><span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">offset</span><span class="p">)</span> <span class="p">{</span></span>
<span id="LC10" class="line" lang="c"> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">offset</span> <span class="o" style="font-weight: 600;">+=</span> <span class="n" style="color: #333;">send</span><span class="p">;</span></span>
<span id="LC11" class="line" lang="c"> <span class="n" style="color: #333;">lseek</span><span class="p">(</span><span class="n" style="color: #333;">fd</span><span class="p">,</span> <span class="n" style="color: #333;">save_offset</span><span class="p">,</span> <span class="n" style="color: #333;">SEEK_SET</span><span class="p">);</span></span>
<span id="LC12" class="line" lang="c"><span class="p">}</span></span></code></pre>
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