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35 .\" @(#)socketpair.2 8.1 (Berkeley) 6/4/93
42 .Nd create a pair of connected sockets
44 .Fd #include <sys/types.h>
45 .Fd #include <sys/socket.h>
47 .Fn socketpair "int d" "int type" "int protocol" "int *sv"
51 call creates an unnamed pair of connected sockets in
56 and using the optionally specified
58 The descriptors used in referencing the new sockets
63 The two sockets are indistinguishable.
65 A 0 is returned if the call succeeds, \-1 if it fails.
67 The call succeeds unless:
70 Too many descriptors are in use by this process.
71 .It Bq Er EAFNOSUPPORT
72 The specified address family is not supported on this machine.
73 .It Bq Er EPROTONOSUPPORT
74 The specified protocol is not supported on this machine.
76 The specified protocol does not support creation of socket pairs.
80 does not specify a valid part of the
81 process address space.
83 The system file table is full.
90 This call is currently implemented only for the
93 Many operating systems only accept a
97 so that should be used instead of
99 for maximal portability.
108 function call appeared in