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<h1 id="errors"><a class="header" href="#errors">Errors</a></h1>
<pre><code class="language-c">typedef enum ... nng_err;
</code></pre>
<p>Many <em>NNG</em> functions can fail for a variety of reasons.
These functions tend to return either zero on success,
or a non-zero error code to indicate failure.
<sup><a name="to-footnote-1"><a href="#footnote-1">1</a></a></sup></p>
<p>All these error codes are <code>nng_err</code>.</p>
<div class="mdbook-alerts mdbook-alerts-note">
<p class="mdbook-alerts-title">
<span class="mdbook-alerts-icon"></span>
note
</p>
<p>Many APIs are still using <code>int</code>, but the <code>nng_err</code> enumeration can be used
instead, and will help with debugging.</p>
</div>
<p>Not every possible error code is defined here, as sometimes
an underlying system or library error code is “wrapped”.</p>
<h2 id="human-readable-error-message"><a class="header" href="#human-readable-error-message">Human Readable Error Message</a></h2>
<pre><code class="language-c">const char *nng_strerror(nng_err err);
</code></pre>
<p>The <a name="a001"></a><code>nng_strerror</code> returns the human-readable description of the
given error in <code>err</code>.</p>
<p>The error message returned is a fixed <code>NUL</code>-terminated string and may be located in
read-only memory.</p>
<p>The returned <a name="a002"></a>error message is provided in US English, but in the
future locale-specific strings may be presented instead.</p>
<div class="mdbook-alerts mdbook-alerts-note">
<p class="mdbook-alerts-title">
<span class="mdbook-alerts-icon"></span>
note
</p>
<p>The specific strings associated with specific error messages are
subject to change.
Therefore applications must not depend on the message,
but may use them verbatim when supplying information to end-users, such
as in diagnostic messages or log entries.</p>
</div>
<h2 id="list-of-errors"><a class="header" href="#list-of-errors">List of Errors</a></h2>
<div class="table-wrapper"><table><thead><tr><th>Error</th><th>Value</th><th>Description</th></tr></thead><tbody>
<tr><td><code>NNG_EINTR</code><a name="NNG_EINTR"></a></td><td>1</td><td>Operation interrupted.</td></tr>
<tr><td><code>NNG_ENOMEM</code><a name="NNG_ENOMEM"></a></td><td>2</td><td>Out of memory, or other resource exhausted.</td></tr>
<tr><td><code>NNG_EINVAL</code><a name="NNG_EINVAL"></a></td><td>3</td><td>Invalid argument. The arguments are invalid or malformed somehow.</td></tr>
<tr><td><code>NNG_EBUSY</code><a name="NNG_EBUSY"></a></td><td>4</td><td>Resource busy.</td></tr>
<tr><td><code>NNG_ETIMEDOUT</code><a name="NNG_ETIMEDOUT"></a></td><td>5</td><td>Timed out. The operation took longer than the allotted time.</td></tr>
<tr><td><code>NNG_ECONNREFUSED</code><a name="NNG_ECONNREFUSED"></a></td><td>6</td><td>Connection refused. Usually indicates the wrong address or a server is running.</td></tr>
<tr><td><code>NNG_ECLOSED</code><a name="NNG_ECLOSED"></a></td><td>7</td><td>Object closed. Typically the <a href="../api/sock.html">socket</a> is closed.</td></tr>
<tr><td><code>NNG_EAGAIN</code><a name="NNG_EAGAIN"></a></td><td>8</td><td>Try again. Typcally for a non-blocking operation that might succeed later.</td></tr>
<tr><td><code>NNG_ENOTSUP</code><a name="NNG_ENOTSUP"></a></td><td>9</td><td>Not supported. Perhaps the protocol or transport is not supported, or the operation is not not supported with the transport or protocol.</td></tr>
<tr><td><code>NNG_EADDRINUSE</code><a name="NNG_EADDRINUSE"></a></td><td>10</td><td>Address in use. The network address is already used by another process. Most often this is seen for <a href="../TODO.html">listeners</a>.</td></tr>
<tr><td><code>NNG_ESTATE</code><a name="NNG_ESTATE"></a></td><td>11</td><td>Incorrect state. The operation cannot be performed in the current state, such as trying to send a response when no request has yet been received.</td></tr>
<tr><td><code>NNG_ENOENT</code><a name="NNG_ENOENT"></a></td><td>12</td><td>Entry not found (no such object.) Can also indicate that a file does not exist.</td></tr>
<tr><td><code>NNG_EPROTO</code><a name="NNG_EPROTO"></a></td><td>13</td><td>Protocol error. Typically this indicates incorrect messages over a network.</td></tr>
<tr><td><code>NNG_EUNREACHABLE</code><a name="NNG_EUNREACHABLE"></a></td><td>14</td><td>Destination unreachable.</td></tr>
<tr><td><code>NNG_EADDRINVAL</code><a name="NNG_EADDRINVAL"></a></td><td>15</td><td>Address invalid. Like <a href="../api/errors.html#NNG_EINVAL"><code>NNG_EINVAL</code></a>, but only for network addresses.</td></tr>
<tr><td><code>NNG_EPERM</code><a name="NNG_EPERM"></a></td><td>16</td><td>Permission denied.</td></tr>
<tr><td><code>NNG_EMSGSIZE</code><a name="NNG_EMSGSIZE"></a></td><td>17</td><td>Message too large.</td></tr>
<tr><td><code>NNG_ECONNABORTED</code><a name="NNG_ECONNABORTED"></a></td><td>18</td><td>Connection aborted. A connection attempt was aborted locally.</td></tr>
<tr><td><code>NNG_ECONNRESET</code><a name="NNG_ECONNRESET"></a></td><td>19</td><td>Connection reset. The remote peer reset the connection unexpectedly.</td></tr>
<tr><td><code>NNG_ECANCELED</code><a name="NNG_ECANCELED"></a></td><td>20</td><td>Operation canceled. Typically as a result of <a href="../api/aio.html#cancellation"><code>nng_aio_cancel</code></a> or similar.</td></tr>
<tr><td><code>NNG_ENOFILES</code><a name="NNG_ENOFILES"></a></td><td>21</td><td>Out of files. Either the destination file system cannot store files, or all available file handles are used.</td></tr>
<tr><td><code>NNG_ENOSPC</code><a name="NNG_ENOSPC"></a></td><td>22</td><td>Out of space. Destination table or filesystem is full.</td></tr>
<tr><td><code>NNG_EEXIST</code><a name="NNG_EEXIST"></a></td><td>23</td><td>Resource already exists.</td></tr>
<tr><td><code>NNG_EREADONLY</code><a name="NNG_EREADONLY"></a></td><td>24</td><td>Read only resource. An attempt to modify a read-only file or other object.</td></tr>
<tr><td><code>NNG_EWRITEONLY</code><a name="NNG_EWRITEONLY"></a></td><td>25</td><td>Write only resource. A read operation failed because the object only supports writes.</td></tr>
<tr><td><code>NNG_ECRYPTO</code><a name="NNG_ECRYPTO"></a></td><td>26</td><td>Cryptographic error. Usually indicates an invalid key was used for TLS.</td></tr>
<tr><td><code>NNG_EPEERAUTH</code><a name="NNG_EPEERAUTH"></a></td><td>27</td><td>Peer could not be authenticated.</td></tr>
<tr><td><code>NNG_EBADTYPE</code><a name="NNG_EBADTYPE"></a></td><td>30</td><td>Incorrect type. A type-specific function was used for an object of the wrong type.</td></tr>
<tr><td><code>NNG_ECONNSHUT</code><a name="NNG_ECONNSHUT"></a></td><td>31</td><td>Connection shutdown. The connection was shut down and cannot be used.</td></tr>
<tr><td><code>NNG_ESTOPPED</code><a name="NNG_ESTOPPED"></a></td><td>1000</td><td>Operation stopped. The operation was stopped with <a href="../api/aio.html#cancellation"><code>nng_aio_stop</code></a>.</td></tr>
<tr><td><code>NNG_EINTERNAL</code><a name="NNG_EINTERNAL"></a></td><td>1000</td><td>An unidentifier internal error occurred.</td></tr>
<tr><td><code>NNG_ESYSERR</code><a name="NNG_ESYSERR"></a></td><td>0x10000000 - 0x1FFFFFFF</td><td>An unidentified system error occurred. These are errors reported by the operating system.</td></tr>
<tr><td><code>NNG_ETRANERR</code><a name="NNG_ETRANERR"></a></td><td>0x20000000 - 0x2FFFFFFF</td><td>An unidentified transport error occurred.</td></tr>
</tbody></table>
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<p><hr/>
<p><a name="footnote-1"><a href="#to-footnote-1">1</a></a>: This convention goes back to UNIX system calls,
which behave the same way, but <em>NNG</em> does not use a separate
<em>errno</em> variable.</p>
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