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NAMEsocketpair - create a pair of connected sockets
SYNOPSISIn sys/types.h In sys/socket.h Ft int Fn socketpair int fd int type int protocol int *sv
DESCRIPTIONThe Fn socketpair system call creates an unnamed pair of connected sockets in the specified domain Fa fd , of the specified Fa type , and using the optionally specified Fa protocol . The descriptors used in referencing the new sockets are returned in Fa sv Ns  and Fa sv Ns  . The two sockets are indistinguishable.
The SOCK_CLOEXEC and SOCK_NONBLOCK flags in the Fa type argument apply to both descriptors.
RETURN VALUESRv -std socketpair
ERRORSThe call succeeds unless:
- Bq Er EMFILE
- Too many descriptors are in use by this process.
- Bq Er EAFNOSUPPORT
- The specified address family is not supported on this machine.
- Bq Er EPROTONOSUPPORT
- The specified protocol is not supported on this machine.
- Bq Er EOPNOTSUPP
- The specified protocol does not support creation of socket pairs.
- Bq Er EFAULT
- The address Fa sv does not specify a valid part of the process address space.