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# socketpair() - Unix, Linux System Call

# NAME

socketpair - create a pair of connected sockets

# SYNOPSIS

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

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

# DESCRIPTION

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.

# RETURN VALUE

On success, zero is returned. On error, -1 is returned, and errno is set appropriately.

# ERRORS

Tag | Description
--- | ---
EAFNOSUPPORT
| The specified address family is not supported on this machine.
EFAULT | The address sv does not specify a valid part of the process address space.
EMFILE | Too many descriptors are in use by this process.
ENFILE | The system limit on the total number of open files has been reached.
EOPNOTSUPP
| The specified protocol does not support creation of socket pairs.
EPROTONOSUPPORT
| The specified protocol is not supported on this machine.

# CONFORMING TO

4.4BSD, POSIX.1-2001. The socketpair() function call appeared in 4.2BSD. It is generally portable to/from non-BSD systems supporting clones of the BSD socket layer (including System V variants).

# NOTES

On Linux, the only supported domain for this call is AF_UNIX (or synonymously, AF_LOCAL). (Most implementations have the same restriction.)

# SEE ALSO

- pipe (2)

- read (2)

- socket (2)

- write (2)

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