socketpair - create a pair of connected sockets
/* See NOTES */
int socketpair(int domain, int type, int
protocol, int sv);
() call creates an unnamed pair of connected sockets in the
, of the specified type
, and using the
optionally specified protocol
. For further details of these arguments,
The descriptors used in referencing the new sockets are returned in sv
. The two sockets are indistinguishable.
On success, zero is returned. On error, -1 is returned, and errno
- The specified address family is not supported on this machine.
- The address sv does not specify a valid part of the process address
- Too many descriptors are in use by this process.
- The system limit on the total number of open files has been reached.
- The specified protocol does not support creation of socket pairs.
- The specified protocol is not supported on this machine.
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).
On Linux, the only supported domain for this call is AF_UNIX
). (Most implementations have the same
Since Linux 2.6.27, socketpair
() supports the SOCK_NONBLOCK
flags described in socket(2)
POSIX.1-2001 does not require the inclusion of <sys/types.h>
this header file is not required on Linux. However, some historical (BSD)
implementations required this header file, and portable applications are
probably wise to include it.
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