= nn_errno(3compat)
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//
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// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
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// Copyright 2018 Capitar IT Group BV <info@capitar.com>
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//
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// This document is supplied under the terms of the MIT License, a
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// copy of which should be located in the distribution where this
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// file was obtained (LICENSE.txt). A copy of the license may also be
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// found online at https://opensource.org/licenses/MIT.
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//
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== NAME
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nn_errno - return most recent error (compatible API)
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== SYNOPSIS
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[source,c]
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----
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#include <nanomsg/nn.h>
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int nn_errno(void);
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----
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== DESCRIPTION
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The `nn_errno()` function returns the error number corresponding to the
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most recent failed operation by the calling thread.
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NOTE: This function is provided for API
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xref:nng_compat.3compat.adoc[compatibility] with legacy _libnanomsg_.
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Consider using the relevant xref:libnng.3.adoc[modern API] instead.
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IMPORTANT: The error numbers returned from this function may include
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errors caused by system functions, which overlap the usual `errno` variable,
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and this function simply returns the value of `errno`.
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However, the values returned may include numeric values that are not
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defined by the system, but are unique to _libnanomsg_, such as `EFSM`.
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This library implements the following error numbers, in addition to any others
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that might be set for `errno` by the underlying system:
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== RETURN VALUES
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This function returns the value of `errno`.
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If no operation has failed, then this will be zero.
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== ERRORS
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[horizontal]
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`EINTR`:: Operation interrupted.
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`ENOMEM`:: Insufficient memory.
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`EINVAL`:: Invalid argument.
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`EBUSY`:: Resource is busy.
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`ETIMEDOUT`:: Operation timed out.
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`ECONNREFUSED`:: Connection refused by peer.
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`EBADF`:: Invalid or closed socket.
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`EAGAIN`:: Operation would block.
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`ENOTSUP`:: Protocol or option not supported.
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`EADDRINUSE`:: Requested address is already in use.
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`EFSM`:: Protocol state incorrect.
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`EPROTO`:: Protocol error.
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`EHOSTUNREACH`:: Remote peer is unreachable.
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`EADDRNOTAVAIL`:: Requested address is not available.
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`EACCES`:: Permission denied.
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`EMSGSIZE`:: Message is too large.
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`ECONNABORTED`:: Connection attempt aborted.
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`ECONNRESET`:: Connection reset by peer.
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`EEXIST`:: Resource already exists.
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`EMFILE`:: Too many open files.
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`ENOSPC`:: Insufficient persistent storage.
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== SEE ALSO
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[.text-left]
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xref:nn_strerror.3compat.adoc[nn_strerror(3compat)],
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xref:nng_compat.3compat.adoc[nng_compat(3compat)],
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xref:nng.7.adoc[nng(7)]
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