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    <p>As the "GNU C Library Reference Manual" says</p> <pre><code>off_t This is a signed integer type used to represent file sizes. In the GNU C Library, this type is no narrower than int. If the source is compiled with _FILE_OFFSET_BITS == 64 this type is transparently replaced by off64_t. </code></pre> <p>and</p> <pre><code>off64_t This type is used similar to off_t. The difference is that even on 32 bit machines, where the off_t type would have 32 bits, off64_t has 64 bits and so is able to address files up to 2^63 bytes in length. When compiling with _FILE_OFFSET_BITS == 64 this type is available under the name off_t. </code></pre> <p>Thus if you want reliable way of representing file size between client and server, you can:</p> <ol> <li>Use <code>off64_t</code> type and <code>stat64()</code> function accordingly (as it fills structure <code>stat64</code>, which contains <code>off64_t</code> type itself). Type <code>off64_t</code> guaranties the same size on 32 and 64 bit machines.</li> <li>As was mentioned before compile <strong>your code</strong> with <code>-D_FILE_OFFSET_BITS == 64</code> and use usual <code>off_t</code> and <code>stat()</code>.</li> <li><p>Convert <code>off_t</code> to type <code>int64_t</code> with fixed size (C99 standard). <strong>Note:</strong> (my book <strong>'C in a Nutshell'</strong> says that it is C99 standard, but optional in implementation). The newest C11 standard says:</p> <pre><code>7.20.1.1 Exact-width integer types 1 The typedef name intN_t designates a signed integer type with width N , no padding bits, and a two’s complement representation. Thus, int8_t denotes such a signed integer type with a width of exactly 8 bits. without mentioning. </code></pre> <p>And about implementation:</p> <pre><code>7.20 Integer types &lt;stdint.h&gt; ... An implementation shall provide those types described as ‘‘required’’, but need not provide any of the others (described as ‘‘optional’’). ... The following types are required: int_least8_t uint_least8_t int_least16_t uint_least16_t int_least32_t uint_least32_t int_least64_t uint_least64_t All other types of this form are optional. </code></pre></li> </ol> <p>Thus, in general, C standard can't guarantee types with fixed sizes. But most compilers (including gcc) support this feature.</p>
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