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| <div id="projectname">lwIP |
|  <span id="projectnumber">2.1.2</span> |
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| <div id="projectbrief">Lightweight IP stack</div> |
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| <div class="title">netdb.c File Reference</div> </div> |
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| <div class="textblock"><code>#include "<a class="el" href="lwip_2netdb_8h.html">lwip/netdb.h</a>"</code><br /> |
| <code>#include "<a class="el" href="err_8h.html">lwip/err.h</a>"</code><br /> |
| <code>#include "<a class="el" href="mem_8h.html">lwip/mem.h</a>"</code><br /> |
| <code>#include "<a class="el" href="memp_8h.html">lwip/memp.h</a>"</code><br /> |
| <code>#include "<a class="el" href="ip__addr_8h.html">lwip/ip_addr.h</a>"</code><br /> |
| <code>#include "<a class="el" href="api_8h.html">lwip/api.h</a>"</code><br /> |
| <code>#include "<a class="el" href="dns_8h.html">lwip/dns.h</a>"</code><br /> |
| <code>#include <string.h></code><br /> |
| <code>#include <stdlib.h></code><br /> |
| </div><table class="memberdecls"> |
| <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="nested-classes"></a> |
| Data Structures</h2></td></tr> |
| <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structgethostbyname__r__helper.html">gethostbyname_r_helper</a></td></tr> |
| <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> |
| </table><table class="memberdecls"> |
| <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a> |
| Macros</h2></td></tr> |
| <tr class="memitem:a768ab8ead892d6454709680340cd070e"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="netdb_8c.html#a768ab8ead892d6454709680340cd070e">LWIP_DNS_API_HOSTENT_STORAGE</a>   0</td></tr> |
| <tr class="separator:a768ab8ead892d6454709680340cd070e"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:acfc1e988534c0e497599b904739f92fe"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="netdb_8c.html#acfc1e988534c0e497599b904739f92fe">HOSTENT_STORAGE</a>   static</td></tr> |
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| <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a> |
| Functions</h2></td></tr> |
| <tr class="memitem:a8adc6d35c068a073369edde71c678cbc"><td class="memItemLeft" align="right" valign="top">struct hostent * </td><td class="memItemRight" valign="bottom"><a class="el" href="netdb_8c.html#a8adc6d35c068a073369edde71c678cbc">lwip_gethostbyname</a> (const char *name)</td></tr> |
| <tr class="separator:a8adc6d35c068a073369edde71c678cbc"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:afa229e90916f6c8d6308828f45351d2d"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="netdb_8c.html#afa229e90916f6c8d6308828f45351d2d">lwip_gethostbyname_r</a> (const char *name, struct hostent *ret, char *buf, size_t buflen, struct hostent **result, int *h_errnop)</td></tr> |
| <tr class="separator:afa229e90916f6c8d6308828f45351d2d"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:a7f65ff5982a0743849a644ef2cd15ef5"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="netdb_8c.html#a7f65ff5982a0743849a644ef2cd15ef5">lwip_freeaddrinfo</a> (struct addrinfo *ai)</td></tr> |
| <tr class="separator:a7f65ff5982a0743849a644ef2cd15ef5"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:af356989c172a51187e22b557f22d4165"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="netdb_8c.html#af356989c172a51187e22b557f22d4165">lwip_getaddrinfo</a> (const char *nodename, const char *servname, const struct addrinfo *hints, struct addrinfo **res)</td></tr> |
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| </table><table class="memberdecls"> |
| <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="var-members"></a> |
| Variables</h2></td></tr> |
| <tr class="memitem:a2a1ce3f2040007303d36c0b682b5ac10"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="netdb_8c.html#a2a1ce3f2040007303d36c0b682b5ac10">h_errno</a></td></tr> |
| <tr class="separator:a2a1ce3f2040007303d36c0b682b5ac10"><td class="memSeparator" colspan="2"> </td></tr> |
| </table> |
| <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2> |
| <div class="textblock"><p>API functions for name resolving </p> |
| </div><h2 class="groupheader">Macro Definition Documentation</h2> |
| <a id="acfc1e988534c0e497599b904739f92fe"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#acfc1e988534c0e497599b904739f92fe">◆ </a></span>HOSTENT_STORAGE</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">#define HOSTENT_STORAGE   static</td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>define "hostent" variables storage </p> |
| |
| </div> |
| </div> |
| <a id="a768ab8ead892d6454709680340cd070e"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#a768ab8ead892d6454709680340cd070e">◆ </a></span>LWIP_DNS_API_HOSTENT_STORAGE</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">#define LWIP_DNS_API_HOSTENT_STORAGE   0</td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>define "hostent" variables storage: 0 if we use a static (but unprotected) set of variables for lwip_gethostbyname, 1 if we use a local storage </p> |
| |
| </div> |
| </div> |
| <h2 class="groupheader">Function Documentation</h2> |
| <a id="a7f65ff5982a0743849a644ef2cd15ef5"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#a7f65ff5982a0743849a644ef2cd15ef5">◆ </a></span>lwip_freeaddrinfo()</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">void lwip_freeaddrinfo </td> |
| <td>(</td> |
| <td class="paramtype">struct addrinfo * </td> |
| <td class="paramname"><em>ai</em></td><td>)</td> |
| <td></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>Frees one or more addrinfo structures returned by <a class="el" href="group__netdbapi.html#ga558191530d91c101621b49e43bd5bbf5">getaddrinfo()</a>, along with any additional storage associated with those structures. If the ai_next field of the structure is not null, the entire list of structures is freed.</p> |
| <dl class="params"><dt>Parameters</dt><dd> |
| <table class="params"> |
| <tr><td class="paramname">ai</td><td>struct addrinfo to free </td></tr> |
| </table> |
| </dd> |
| </dl> |
| |
| </div> |
| </div> |
| <a id="af356989c172a51187e22b557f22d4165"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#af356989c172a51187e22b557f22d4165">◆ </a></span>lwip_getaddrinfo()</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">int lwip_getaddrinfo </td> |
| <td>(</td> |
| <td class="paramtype">const char * </td> |
| <td class="paramname"><em>nodename</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">const char * </td> |
| <td class="paramname"><em>servname</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">const struct addrinfo * </td> |
| <td class="paramname"><em>hints</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">struct addrinfo ** </td> |
| <td class="paramname"><em>res</em> </td> |
| </tr> |
| <tr> |
| <td></td> |
| <td>)</td> |
| <td></td><td></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>Translates the name of a service location (for example, a host name) and/or a service name and returns a set of socket addresses and associated information to be used in creating a socket with which to address the specified service. Memory for the result is allocated internally and must be freed by calling <a class="el" href="netdb_8c.html#a7f65ff5982a0743849a644ef2cd15ef5">lwip_freeaddrinfo()</a>!</p> |
| <p>Due to a limitation in dns_gethostbyname, only the first address of a host is returned. Also, service names are not supported (only port numbers)!</p> |
| <dl class="params"><dt>Parameters</dt><dd> |
| <table class="params"> |
| <tr><td class="paramname">nodename</td><td>descriptive name or address string of the host (may be NULL -> local address) </td></tr> |
| <tr><td class="paramname">servname</td><td>port number as string of NULL </td></tr> |
| <tr><td class="paramname">hints</td><td>structure containing input values that set socktype and protocol </td></tr> |
| <tr><td class="paramname">res</td><td>pointer to a pointer where to store the result (set to NULL on failure) </td></tr> |
| </table> |
| </dd> |
| </dl> |
| <dl class="section return"><dt>Returns</dt><dd>0 on success, non-zero on failure</dd></dl> |
| |
| </div> |
| </div> |
| <a id="a8adc6d35c068a073369edde71c678cbc"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#a8adc6d35c068a073369edde71c678cbc">◆ </a></span>lwip_gethostbyname()</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">struct hostent* lwip_gethostbyname </td> |
| <td>(</td> |
| <td class="paramtype">const char * </td> |
| <td class="paramname"><em>name</em></td><td>)</td> |
| <td></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>Returns an entry containing addresses of address family AF_INET for the host with name name. Due to dns_gethostbyname limitations, only one address is returned.</p> |
| <dl class="params"><dt>Parameters</dt><dd> |
| <table class="params"> |
| <tr><td class="paramname">name</td><td>the hostname to resolve </td></tr> |
| </table> |
| </dd> |
| </dl> |
| <dl class="section return"><dt>Returns</dt><dd>an entry containing addresses of address family AF_INET for the host with name name </dd></dl> |
| |
| </div> |
| </div> |
| <a id="afa229e90916f6c8d6308828f45351d2d"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#afa229e90916f6c8d6308828f45351d2d">◆ </a></span>lwip_gethostbyname_r()</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">int lwip_gethostbyname_r </td> |
| <td>(</td> |
| <td class="paramtype">const char * </td> |
| <td class="paramname"><em>name</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">struct hostent * </td> |
| <td class="paramname"><em>ret</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">char * </td> |
| <td class="paramname"><em>buf</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">size_t </td> |
| <td class="paramname"><em>buflen</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">struct hostent ** </td> |
| <td class="paramname"><em>result</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">int * </td> |
| <td class="paramname"><em>h_errnop</em> </td> |
| </tr> |
| <tr> |
| <td></td> |
| <td>)</td> |
| <td></td><td></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>Thread-safe variant of lwip_gethostbyname: instead of using a static buffer, this function takes buffer and errno pointers as arguments and uses these for the result.</p> |
| <dl class="params"><dt>Parameters</dt><dd> |
| <table class="params"> |
| <tr><td class="paramname">name</td><td>the hostname to resolve </td></tr> |
| <tr><td class="paramname">ret</td><td>pre-allocated struct where to store the result </td></tr> |
| <tr><td class="paramname">buf</td><td>pre-allocated buffer where to store additional data </td></tr> |
| <tr><td class="paramname">buflen</td><td>the size of buf </td></tr> |
| <tr><td class="paramname">result</td><td>pointer to a hostent pointer that is set to ret on success and set to zero on error </td></tr> |
| <tr><td class="paramname">h_errnop</td><td>pointer to an int where to store errors (instead of modifying the global h_errno) </td></tr> |
| </table> |
| </dd> |
| </dl> |
| <dl class="section return"><dt>Returns</dt><dd>0 on success, non-zero on error, additional error information is stored in *h_errnop instead of h_errno to be thread-safe </dd></dl> |
| |
| </div> |
| </div> |
| <h2 class="groupheader">Variable Documentation</h2> |
| <a id="a2a1ce3f2040007303d36c0b682b5ac10"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#a2a1ce3f2040007303d36c0b682b5ac10">◆ </a></span>h_errno</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">int h_errno</td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>h_errno is exported in netdb.h for access by applications. </p> |
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