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@(#)socketpair.2 6.2 (Berkeley) 02/14/89

C 5 socketpair - create a pair of connected sockets

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

socketpair(d, type, protocol, sv)
int d, type, protocol;
int sv[2];

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

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

20 [EAFNOSUPPORT] The specified address family is not supported on this machine.

20 [EPROTONOSUPPORT] The specified protocol is not supported on this machine.

20 [EOPNOSUPPORT] The specified protocol does not support creation of socket pairs.

20 [EFAULT] The address sv does not specify a valid part of the process address space.

read(2), write(2), pipe(2) This call is currently implemented only for the UNIX domain.