socketpair(2) [freebsd man page]

SOCKETPAIR(2)						      BSD System Calls Manual						     SOCKETPAIR(2)

NAME

     socketpair -- create a pair of connected sockets

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

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

     int
     socketpair(int fd, int type, int protocol, int *sv);

DESCRIPTION

     The socketpair() system call creates an unnamed pair of connected sockets in the specified domain fd, 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.

     The SOCK_CLOEXEC and SOCK_NONBLOCK flags in the type argument apply to both descriptors.

RETURN VALUES

     The socketpair() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indi-
     cate the error.

ERRORS

     The call succeeds unless:

     [EMFILE]		Too many descriptors are in use by this process.

     [EAFNOSUPPORT]	The specified address family is not supported on this machine.

     [EPROTONOSUPPORT]	The specified protocol is not supported on this machine.

     [EOPNOTSUPP]	The specified protocol does not support creation of socket pairs.

     [EFAULT]		The address sv does not specify a valid part of the process address space.

SEE ALSO

     pipe(2), read(2), socket(2), write(2)

HISTORY

     The socketpair() system call appeared in 4.2BSD.

BUGS

     This call is currently implemented only for the UNIX domain.

BSD
								September 11, 2013							       BSD

SOCKETPAIR(2)						     Linux Programmer's Manual						     SOCKETPAIR(2)

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  indistin-
       guishable.

RETURN VALUE

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

ERRORS

       EMFILE Too many descriptors are in use by this process.

       EAFNOSUPPORT
	      The specified address family is not supported on this machine.

       EPROTONOSUPPORT
	      The specified protocol is not supported on this machine.

       EOPNOTSUPP
	      The specified protocol does not support creation of socket pairs.

       EFAULT The address sv does not specify a valid part of the process address space.

CONFORMING TO

       4.4BSD  (the  socketpair  function call appeared in 4.2BSD). 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  restric-
       tion.)

SEE ALSO

       read(2), write(2), pipe(2), socket(2), unix(7)

BSD Man Page							    1993-07-24							     SOCKETPAIR(2)