mtcp_socket

NAME

mtcp_socket − instantiate an mTCP endpoint for communication

SYNOPSIS

#include <mtcp_api.h>

int mtcp_socket(mctx_t mctx, int domain, int type, int protocol);

DESCRIPTION

mtcp_socket() can be used to create a communication endpoint for mTCP-based network connection. In many ways, it behaves similar to a BSD socket. An mtcp_socket() call takes an additional argument named mctx that represents the per-core mTCP context in an application (see mtcp_create_context() for details).

The domain argument is used to specify a communication domain; in mTCP, the only available protocol family for the domain is AF_INET which represents IPv4 Internet protocol.

The socket type denotes the communication semantics and the only available type in mTCP at the moment is SOCK_STREAM which represents TCP’s reliable, sequenced, full-duplex communication between two endpoints.

The protocol argument represents the specific protocol ID to be used with the socket. mTCP assumes this argument to be 0 (since it only supports single-protocol sockets).

Sockets of type SOCK_STREAM are full-duplex bytestreams. A stream socket must be in ESTABLISHED TCP state before data can be sent or received on it. A connection to another peer endpoint can be created with an mtcp_connect() call. Once connected, data may be exchanged using mtcp_read() and mtcp_write() calls. When a session needs to be terminated, mtcp_close() can be called. Socket operations can be manipulated using socket level options via mtcp_setsockopt() and mtcp_getsockopt() function calls. mTCP sockets run in non-blocking mode by default.

RETURN VALUE

Returns an mTCP descriptor ID on success; -1 on failure. In case of failure, errno is set appropriately. Please note that each mTCP context (referred to by mctx ) creates its own dedicated pool of sockets.

ERRORS

	EAFNOSUPPORT		domain is not supported.
	EINVAL		The socket type is invalid.
	ENFILE		No socket descriptor is available in the pool at the moment.

AUTHORS

mTCP development team <mtcp-user@list.ndsl.kaist.edu>

COLOPHON

This page is part of mTCP release 3.0 docs section. A description of the project, and information about reporting bugs, can be found at http://shader.kaist.edu/mtcp/.