SOCKETPAIR(2) | System Calls Manual | SOCKETPAIR(2) |
socketpair
—
create a pair of connected sockets
#include
<sys/socket.h>
int
socketpair
(int
d, int type,
int protocol,
int sv[2]);
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.
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.
This call is currently implemented only for the LOCAL domain. Many
operating systems only accept a protocol of
AF_UNSPEC
, so that should be used instead of
AF_LOCAL
for maximal portability.
May 29, 2016 | OpenBSD-6.1 |