NAME
socketpair —
create a pair of connected
sockets
LIBRARY
library “libc”
SYNOPSIS
#include
<sys/types.h>
#include <sys/socket.h>
int
socketpair(int
d, int type,
int protocol,
int *sv);
DESCRIPTION
Thesocketpair()
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.
The SOCK_CLOEXEC and
SOCK_NONBLOCK flags in the
type argument apply to both descriptors.
RETURN VALUES
The socketpair() 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
HISTORY
The socketpair() function call appeared in
4.2BSD.
BUGS
This call is currently implemented only for the UNIX domain.