socketpair.2

<B>Digital的Unix操作系统VAX 4.2源码</B>

.\" SCCSID: @(#)socketpair.2	8.1	9/11/90
.TH socketpair 2
.SH Name
socketpair \- create a pair of connected sockets
.SH Syntax
.nf
.ft B
#include <sys/types.h>
#include <sys/socket.h>
.PP
.ft B
socketpair(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 socketpair
call creates an unnamed pair of connected sockets in
the specified domain
.IR d ,
of the specified
.IR type ,
and using the optionally specified
.IR protocol .
The descriptors used in referencing the new sockets
are returned in
.IR sv [0]
and
.IR sv [1].
The two sockets are indistinguishable.
.SH Return Values
A zero (0) is returned if the call succeeds, \-1 if it fails.
.SH Diagnostics
The 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 the
process address space.
.SH See Also
pipe(2), read(2), write(2)