SOCKETPAIR

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
CONFORMING TO
NOTES
SEE ALSO

NAME

socketpair − create a pair of connected sockets

SYNOPSIS

#include <sys/types.h>
#include <sys/socket.h>

int socketpair(int d, int type, int protocol, int sv[2]);

DESCRIPTION

The socketpair call creates an unnamed pair of connected sockets in the specified domain d, of the specified type, and using the optionally specified protocol. The descriptors used in referencing the new sockets are returned in sv[0] and sv[1]. The two sockets are indistinguishable.

RETURN VALUE

On success, zero is returned. On error, −1 is returned, and errno is set appropriately.

ERRORS

EMFILE

Too many descriptors are in use by this process.

EAFNOSUPPORT

The specified address family is not supported on this machine.

EPROTONOSUPPORT

The specified protocol is not supported on this machine.

EOPNOTSUPP

The specified protocol does not support creation of socket pairs.

EFAULT

The address sv does not specify a valid part of the process address space.

CONFORMING TO

4.4BSD, SUSv2, POSIX 1003.1-2001. The socketpair function call appeared in 4.2BSD. It is generally portable to/from non-BSD systems supporting clones of the BSD socket layer (including System V variants).

NOTES

On Linux, the only supported domain for this call is AF_UNIX (or synonymously, AF_LOCAL). (Most implementations have the same restriction.)

SEE ALSO

read(2), write(2), pipe(2), socket(2), unix(7)






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