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.TH SOCKETPAIR 2
.SH NAME
socketpair \- creates a pair of connected sockets.
.SH SYNOPSIS
.ft B
#include <sys/socket.h>

int socketpair(int \fIdomain\fP, int \fItype\fP, int \fIprotocol\fP, int \fIsv[2]\fP);
.br
.ft P
.SH DESCRIPTION
socketpair() creates two connected sockets of the specified \fItype\fP 
in the specified \fIdomain\fP using the specified \fIprotocol\fP and 
stores the two resulting socket descriptors in \fIsv[2]\fP.
.SH RETURN VALUES
On success, this function returns 0, and \fIsv[2]\fP is set to the two 
newly created socket descriptors. On error, -1 is returned and 
\fIerrno\fP is set.
.SH ERRORS
.TP 15
[EAFNOSUPPORT]
The \fIdomain\fP is not supported.
.TP 15
[EPROTOTYPE]
The \fIprotocol\fP is not supported by the \fIdomain\fP.
.TP 15
[EPROTONOSUPPORT]
The \fIprotocol\fP is not supported by the \fItype\fP.
.TP 15
[EINVAL]
The pair of sockets aren't in a valid state or are not connection oriented sockets.
.TP 15
[EPERM]
The user ID, group ID, and process ID of the first socket doesn't match that of the second.
.SH NOTES
This function is only implemented for unix domain sockets. Therefore, 
the only valid value for \fIdomain\fP is
.B AF_UNIX
.SH SEE ALSO
.BR socket (2),
.BR unix (8)

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