NN_SOCKET(3) nanomsg manual NN_SOCKET(3)NAMEnn_socket - create an SP socket
SYNOPSIS
#include <nanomsg/nn.h>
int nn_socket (int domain, int protocol);
DESCRIPTION
Creates an SP socket with specified domain and protocol. Returns a file
descriptor for the newly created socket.
Following domains are defined at the moment:
AF_SP
Standard full-blown SP socket.
AF_SP_RAW
Raw SP socket. Raw sockets omit the end-to-end functionality found
in AF_SP sockets and thus can be used to implement intermediary
devices in SP topologies.
protocol parameter defines the type of the socket, which in turn
determines the exact semantics of the socket. Check manual pages for
individual SP protocols to get the list of available socket types.
The newly created socket is initially not associated with any
endpoints. In order to establish a message flow at least one endpoint
has to be added to the socket using nn_bind(3) or nn_connect(3)
function.
Also note that type argument as found in standard socket(2) function is
omitted from nn_socket. All the SP sockets are message-based and thus
of SOCK_SEQPACKET type.
RETURN VALUE
If the function succeeds file descriptor of the new socket is returned.
Otherwise, -1 is returned and errno is set to to one of the values
defined below.
Note that file descriptors returned by nn_socket function are not
standard file descriptors and will exhibit undefined behaviour when
used with system functions. Moreover, it may happen that a system file
descriptor and file descriptor of an SP socket will incidentally
collide (be equal).
ERRORS
EAFNOSUPPORT
Specified address family is not supported.
EINVAL
Unknown protocol.
EMFILE
The limit on the total number of open SP sockets or OS limit for
file descriptors has been reached.
ETERM
The library is terminating.
EXAMPLE
int s = nn_socket (AF_SP, NN_PUB);
assert (s >= 0);
SEE ALSOnn_pubsub(7)nn_reqrep(7)nn_pipeline(7)nn_survey(7)nn_bus(7)nn_bind(3)nn_connect(3)nn_close(3)nanomsg(7)AUTHORS
Martin Sustrik <sustrik@250bpm.com[1]>
NOTES
1. sustrik@250bpm.com
mailto:sustrik@250bpm.com
nanomsg Unknown 12/23/2015 NN_SOCKET(3)
