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() system call creates an unnamed pair of connected sockets in the specified address family 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

socketpair() returns a −1 on failure, otherwise it returns the number of the second file descriptor it creates. 

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. 

SEE ALSO

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

BUGS

This call is currently implemented only for the AF_UNIX address family. 

Sun Release 4.0  —  Last change: 22 March 1989