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= nng_ctx_recvmsg(3)
//
// Copyright 2021 Staysail Systems, Inc. <info@staysail.tech>
//
// This document is supplied under the terms of the MIT License, a
// copy of which should be located in the distribution where this
// file was obtained (LICENSE.txt). A copy of the license may also be
// found online at https://opensource.org/licenses/MIT.
//
== NAME
nng_ctx_recvmsg - receive message using socket
== SYNOPSIS
[source, c]
----
#include <nng/nng.h>
int nng_ctx_recvmsg(nng_ctx ctx, nng_msg **msgp, int flags);
----
== DESCRIPTION
The `nng_ctx_recvmsg()` receives a message on context _ctx_, storing the
received message at the location pointed to by _msgp_.
The _flags_ may contain the following value:
`NNG_FLAG_NONBLOCK`::
The function returns immediately, even if no message is available.
Without this flag, the function will wait until a message is receivable
on the context _ctx_, or any configured timer expires.
NOTE: The semantics of what receiving a message means vary from protocol to
protocol, so examination of the protocol documentation is encouraged.
== RETURN VALUES
This function returns 0 on success, and non-zero otherwise.
== ERRORS
[horizontal]
`NNG_EAGAIN`:: The operation would block, but `NNG_FLAG_NONBLOCK` was specified.
`NNG_ECLOSED`:: The context or socket is not open.
`NNG_EINVAL`:: An invalid set of _flags_ was specified.
`NNG_ENOMEM`:: Insufficient memory is available.
`NNG_ENOTSUP`:: The protocol does not support receiving.
`NNG_ESTATE`:: The context cannot receive data in this state.
`NNG_ETIMEDOUT`:: The operation timed out.
== SEE ALSO
[.text-left]
xref:nng_msg_free.3.adoc[nng_msg_free(3)],
xref:nng_ctx_open.3.adoc[nng_ctx_open(3)],
xref:nng_ctx_recv.3.adoc[nng_ctx_recv(3)],
xref:nng_ctx_sendmsg.3.adoc[nng_ctx_sendmsg(3)],
xref:nng_strerror.3.adoc[nng_strerror(3)],
xref:nng_ctx.5.adoc[nng_ctx(5)],
xref:nng.7.adoc[nng(7)]
|
