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32 .\" @(#)socketpair.2 8.1 (Berkeley) 6/4/93
39 .Nd create a pair of connected sockets
41 .Fd #include <sys/types.h>
42 .Fd #include <sys/socket.h>
44 .Fn socketpair "int d" "int type" "int protocol" "int *sv"
48 call creates an unnamed pair of connected sockets in
53 and using the optionally specified
55 The descriptors used in referencing the new sockets
60 The two sockets are indistinguishable.
62 A 0 is returned if the call succeeds, -1 if it fails.
64 The call succeeds unless:
65 .Bl -tag -width EPROTONOSUPPORTA
67 Too many descriptors are in use by this process.
68 .It Bq Er EAFNOSUPPORT
69 The specified address family is not supported on this machine.
70 .It Bq Er EPROTONOSUPPORT
71 The specified protocol is not supported on this machine.
72 .It Bq Er EOPNOSUPPORT
73 The specified protocol does not support creation of socket pairs.
77 does not specify a valid part of the
78 process address space.
84 This call is currently implemented only for the
90 function call appeared in