SOCKETPAIR(2) | System Calls Manual | SOCKETPAIR(2) |
socketpair
—
create a pair of connected sockets
#include
<sys/socket.h>
int
socketpair
(int
domain, int type,
int protocol,
int sv[2]);
The
socketpair
()
call creates an unnamed pair of connected sockets. The descriptors used in
referencing the new sockets are returned in sv[0] and
sv[1]. The two sockets are indistinguishable.
The only supported domain is
AF_UNIX
. Possible values for the
type and protocol arguments are
explained in the socket(2)
manual page. The only useful value for protocol is 0,
which will let the system select an appropriate protocol for the requested
socket type.
Any combination of the following flags may additionally be used in the type argument:
Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error.
The call succeeds unless:
EAFNOSUPPORT
]EPROTONOSUPPORT
]EOPNOTSUPP
]EPROTOTYPE
]EMFILE
]ENFILE
]ENOBUFS
]EFAULT
]The socketpair
() function conforms to
IEEE Std 1003.1-2008 (“POSIX.1”). The
SOCK_CLOEXEC
and
SOCK_NONBLOCK
flags are expected to conform to a
future revision of that standard.
The socketpair
() function call appeared in
4.2BSD. Support for the
SOCK_CLOEXEC
and
SOCK_NONBLOCK
flags appeared in
OpenBSD 5.7.
April 8, 2018 | OpenBSD-7.0 |