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| <h4 class="subsection">16.3.2 Setting the Address of a Socket</h4> |
| |
| <p><a name="index-sys_002fsocket_002eh-1662"></a>Use the <code>bind</code> function to assign an address to a socket. The |
| prototype for <code>bind</code> is in the header file <samp><span class="file">sys/socket.h</span></samp>. |
| For examples of use, see <a href="Local-Socket-Example.html#Local-Socket-Example">Local Socket Example</a>, or see <a href="Inet-Example.html#Inet-Example">Inet Example</a>. |
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| <!-- sys/socket.h --> |
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| — Function: int <b>bind</b> (<var>int socket, struct sockaddr *addr, socklen_t length</var>)<var><a name="index-bind-1663"></a></var><br> |
| <blockquote><p>The <code>bind</code> function assigns an address to the socket |
| <var>socket</var>. The <var>addr</var> and <var>length</var> arguments specify the |
| address; the detailed format of the address depends on the namespace. |
| The first part of the address is always the format designator, which |
| specifies a namespace, and says that the address is in the format of |
| that namespace. |
| |
| <p>The return value is <code>0</code> on success and <code>-1</code> on failure. The |
| following <code>errno</code> error conditions are defined for this function: |
| |
| <dl> |
| <dt><code>EBADF</code><dd>The <var>socket</var> argument is not a valid file descriptor. |
| |
| <br><dt><code>ENOTSOCK</code><dd>The descriptor <var>socket</var> is not a socket. |
| |
| <br><dt><code>EADDRNOTAVAIL</code><dd>The specified address is not available on this machine. |
| |
| <br><dt><code>EADDRINUSE</code><dd>Some other socket is already using the specified address. |
| |
| <br><dt><code>EINVAL</code><dd>The socket <var>socket</var> already has an address. |
| |
| <br><dt><code>EACCES</code><dd>You do not have permission to access the requested address. (In the |
| Internet domain, only the super-user is allowed to specify a port number |
| in the range 0 through <code>IPPORT_RESERVED</code> minus one; see |
| <a href="Ports.html#Ports">Ports</a>.) |
| </dl> |
| |
| <p>Additional conditions may be possible depending on the particular namespace |
| of the socket. |
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