'\" t
.\"     Title: nn_socket
.\"    Author: [see the "AUTHOR(S)" section]
.\" Generator: Asciidoctor 2.0.26
.\"      Date: 2021-02-08
.\"    Manual: NNG Reference Manual
.\"    Source: \ \&
.\"  Language: English
.\"
.TH "NN_SOCKET" "3compat" "2021-02-08" "\ \&" "NNG Reference Manual"
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.SH "NAME"
nn_socket \- create socket (compatible API)
.SH "SYNOPSIS"
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.fam C
#include <nanomsg/nn.h>

int nn_socket(int af, int proto);
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.if n .RE
.SH "DESCRIPTION"
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The \f(CRnn_socket()\fP function creates socket using the address family \fIaf\fP and
protocol \fIproto\fP and returns it.
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.B Note
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This function is provided for API
compatibility with legacy \fIlibnanomsg\fP.
Consider using the relevant modern API instead.
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Mixing the compatibility API and the modern API is not supported
on a given socket.
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Some protocols, transports, and features are only available in the modern API.
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The address family \fIaf\fP can be one of two values:
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\f(CRAF_SP\fP
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Normal socket.
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\f(CRAF_SP_RAW\fP
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Raw mode socket.
.RE
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The protocol indicates the protocol to be used when creating the socket.
The following protocols are defined:
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\f(CRNN_PAIR\fP
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Pair protocol.
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\f(CRNN_PUB\fP
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Publisher protocol.
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\f(CRNN_SUB\fP
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Subscriber protocol.
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\f(CRNN_REQ\fP
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Requestor protocol.
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\f(CRNN_REP\fP
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Replier protocol.
.RE
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\f(CRNN_PUSH\fP
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Push protocol.
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\f(CRNN_PULL\fP
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Pull protocol.
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\f(CRNN_SURVEYOR\fP
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Surveyor protocol.
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\f(CRNN_RESPONDENT\fP
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Respondent protocol.
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\f(CRNN_BUS\fP
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Bus protocol.
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.SH "RETURN VALUES"
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This function returns a valid socket number on success, and \-1 on failure.
.SH "ERRORS"
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\f(CRENOMEM\fP
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Insufficient memory is available.
.RE
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\f(CRENOTSUP\fP
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The protocol is not supported.
.RE
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\f(CRETERM\fP
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The library is shutting down.
.RE
.SH "SEE ALSO"
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nng_socket(5),
nn_close(3compat),
nn_errno(3compat),
nng_compat(3compat),
nng(7)