NAME    [Toc]    [Back]

     socketpair - create a pair of connected sockets

LIBRARY    [Toc]    [Back]

     Standard C Library (libc, -lc)

SYNOPSIS    [Toc]    [Back]

     #include <sys/socket.h>

     int
     socketpair(int d, int type, int protocol, int *sv);

DESCRIPTION    [Toc]    [Back]

     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 VALUES    [Toc]    [Back]

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

ERRORS    [Toc]    [Back]

     The call succeeds unless:

     [EMFILE]           Too many descriptors are in use by this process.

     [ENFILE]           The system file table is full.

     [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.

SEE ALSO    [Toc]    [Back]

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

HISTORY    [Toc]    [Back]

     The socketpair() function call appeared in 4.2BSD.

BUGS    [Toc]    [Back]

     This call is currently implemented only for the UNIX domain.

BSD                            October 16, 2001                            BSD