table of contents
other sections
SOCKETPAIR(2) | 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¶
Thesocketpair
() 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¶
Thesocketpair
() function returns the
value 0 if successful; otherwise the value -1 is returned and
the global variable errno is set to indicate
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¶
Thesocketpair
() system call appeared in
4.2BSD.
BUGS¶
This call is currently implemented only for the UNIX domain.September 11, 2013 | Debian |