NAME
socketpair —
create a pair of connected
sockets
LIBRARY
library “libc”
SYNOPSIS
#include
<sys/types.h>
#include <sys/socket.h>
int
socketpair(int
domain, int type,
int protocol,
int *sv);
DESCRIPTION
Thesocketpair()
system call creates an unnamed pair of connected sockets in the specified
communications domain, 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
STANDARDS
The socketpair() system call conforms to
IEEE Std 1003.1-2001 (“POSIX.1”) and
IEEE Std 1003.1-2008 (“POSIX.1”).
HISTORY
The socketpair() system call appeared in
4.2BSD.
BUGS
This call is currently implemented only for the UNIX domain.