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| <h4 class="subsection">E.13.10 File-I/O Examples</h4> |
| <a name="index-file_002di_002fo-examples"></a> |
| |
| <p>Example sequence of a write call, file descriptor 3, buffer is at target |
| address 0x1234, 6 bytes should be written: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample"><- <code>Fwrite,3,1234,6</code> |
| <em>request memory read from target</em> |
| -> <code>m1234,6</code> |
| <- XXXXXX |
| <em>return "6 bytes written"</em> |
| -> <code>F6</code> |
| </pre></div> |
| |
| <p>Example sequence of a read call, file descriptor 3, buffer is at target |
| address 0x1234, 6 bytes should be read: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample"><- <code>Fread,3,1234,6</code> |
| <em>request memory write to target</em> |
| -> <code>X1234,6:XXXXXX</code> |
| <em>return "6 bytes read"</em> |
| -> <code>F6</code> |
| </pre></div> |
| |
| <p>Example sequence of a read call, call fails on the host due to invalid |
| file descriptor (<code>EBADF</code>): |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample"><- <code>Fread,3,1234,6</code> |
| -> <code>F-1,9</code> |
| </pre></div> |
| |
| <p>Example sequence of a read call, user presses <kbd>Ctrl-c</kbd> before syscall on |
| host is called: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample"><- <code>Fread,3,1234,6</code> |
| -> <code>F-1,4,C</code> |
| <- <code>T02</code> |
| </pre></div> |
| |
| <p>Example sequence of a read call, user presses <kbd>Ctrl-c</kbd> after syscall on |
| host is called: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample"><- <code>Fread,3,1234,6</code> |
| -> <code>X1234,6:XXXXXX</code> |
| <- <code>T02</code> |
| </pre></div> |
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