socketpair — create a pair of connected sockets
#include <sys/types.h> /* See NOTES */ #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 in the specified
domain, of the
specified type, and
using the optionally specified protocol. For further details
of these arguments, see socket(2).
The descriptors used in referencing the new sockets are
returned in sv[0] and
sv[1]. The two
sockets are indistinguishable.
On success, zero is returned. On error, −1 is
returned, and errno is set
appropriately.
The specified address family is not supported on this machine.
The address sv does not specify a
valid part of the process address space.
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 (or synonymously,
AF_LOCAL). (Most
implementations have the same restriction.)
Since Linux 2.6.27, socketpair() supports the SOCK_NONBLOCK and SOCK_CLOEXEC flags described in socket(2).
POSIX.1-2001 does not require the inclusion of
<sys/types.h> and 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.
This page is part of release 3.24 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
|
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