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| <h3 class="section">13.14 File Status Flags</h3> |
| |
| <p><a name="index-file-status-flags-1328"></a> |
| <dfn>File status flags</dfn> are used to specify attributes of the opening of a |
| file. Unlike the file descriptor flags discussed in <a href="Descriptor-Flags.html#Descriptor-Flags">Descriptor Flags</a>, the file status flags are shared by duplicated file descriptors |
| resulting from a single opening of the file. The file status flags are |
| specified with the <var>flags</var> argument to <code>open</code>; |
| see <a href="Opening-and-Closing-Files.html#Opening-and-Closing-Files">Opening and Closing Files</a>. |
| |
| <p>File status flags fall into three categories, which are described in the |
| following sections. |
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| <ul> |
| <li><a href="Access-Modes.html#Access-Modes">Access Modes</a>, specify what type of access is allowed to the |
| file: reading, writing, or both. They are set by <code>open</code> and are |
| returned by <code>fcntl</code>, but cannot be changed. |
| |
| <li><a href="Open_002dtime-Flags.html#Open_002dtime-Flags">Open-time Flags</a>, control details of what <code>open</code> will do. |
| These flags are not preserved after the <code>open</code> call. |
| |
| <li><a href="Operating-Modes.html#Operating-Modes">Operating Modes</a>, affect how operations such as <code>read</code> and |
| <code>write</code> are done. They are set by <code>open</code>, and can be fetched or |
| changed with <code>fcntl</code>. |
| </ul> |
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| <p>The symbols in this section are defined in the header file |
| <samp><span class="file">fcntl.h</span></samp>. |
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| <li><a accesskey="1" href="Access-Modes.html#Access-Modes">Access Modes</a>: Whether the descriptor can read or write. |
| <li><a accesskey="2" href="Open_002dtime-Flags.html#Open_002dtime-Flags">Open-time Flags</a>: Details of <code>open</code>. |
| <li><a accesskey="3" href="Operating-Modes.html#Operating-Modes">Operating Modes</a>: Special modes to control I/O operations. |
| <li><a accesskey="4" href="Getting-File-Status-Flags.html#Getting-File-Status-Flags">Getting File Status Flags</a>: Fetching and changing these flags. |
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