NAME

socketpair − create a pair of connected sockets

SYNOPSIS

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

socketpair(d, type, protocol, sv)
int d, type, 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.

DIAGNOSTICS

A 0 is returned if the call succeeds, −1 if it fails. 

ERRORS

The call succeeds unless:

[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.

[EOPNOSUPPORT] 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. 

NOTE

The primitives documented on this manual page are system calls, but unlike most system calls they are not resolved by libc.  To compile and link a program that makes these calls, follow the procedures for section (3B) routines as described in intro(3).

SEE ALSO

read(2), write(2), pipe(2)

BUGS

This call is currently implemented only for the UNIX domain. 

Version 2.5r1  —  October 29, 1986