.\" SCCSID: @(#)socketpair.2	8.1	9/11/90.TH socketpair 2.SH Namesocketpair \- create a pair of connected sockets.SH Syntax.nf.ft B#include <sys/types.h>#include <sys/socket.h>.PP.ft Bsocketpair(d, type, protocol, sv)int d, type, protocol;int sv[2];.fi.SH Description.NXR "socketpair system call".NXA "socketpair system call" "pipe system call".NXA "socketpair system call" "getpeername system call".NXR "socket" "creating connected pair"The.PN socketpaircall creates an unnamed pair of connected sockets inthe specified domain.IR d ,of the specified.IR type ,and using the optionally specified.IR protocol .The descriptors used in referencing the new socketsare returned in.IR sv [0]and.IR sv [1].The two sockets are indistinguishable..SH Return ValuesA zero (0) is returned if the call succeeds, \-1 if it fails..SH DiagnosticsThe call succeeds unless:.TP 20[EMFILE]Too many descriptors are in use by this process..TP 20[EAFNOSUPPORT]The specified address family is not supported on this machine..TP 20[EPROTONOSUPPORT]The specified protocol is not supported on this machine..TP 20[EOPNOSUPPORT]The specified protocol does not support creation of socket pairs..TP 20[EFAULT]The address \fIsv\fP does not specify a valid part of theprocess address space..SH See Alsopipe(2), read(2), write(2)