socketpair(2)socketpair(2)NAMEsocketpair - Create a pair of connected sockets
SYNOPSIS
#include <sys/socket.h>
int socketpair(
int domain,
int type,
int protocol,
int socket_vector[2] );
STANDARDS
Interfaces documented on this reference page conform to industry stan‐
dards as follows:
socketpair(): XNS4.0, XNS5.0
Refer to the standards(5) reference page for more information about
industry standards and associated tags.
PARAMETERS
Specifies the communications domain in which the sockets are created.
This function does not create sockets in the Internet domain. Speci‐
fies the communications method that sockets use, for example SOCK_DGRAM
or SOCK_STREAM. Specifies an optional identifier used to define the
communications protocols used in the transport layer interface. Speci‐
fies a two-integer array used to hold the file descriptors of the
socket pair created with the call to this function.
DESCRIPTION
The socketpair() function creates an unnamed pair of connected sockets
in a specified domain, of a specified type, under the protocol option‐
ally specified by the protocol parameter. The two sockets are identi‐
cal. The file descriptors used in referencing the created sockets are
returned to socket_vector[0] and socket_vector[1]. The sys/socket.h
include file contains definitions for socket domains, types, and proto‐
cols.
Not all protocol families support the socketpair() function.
RETURN VALUES
Upon successful completion, this function returns a value of 0 (zero).
Otherwise, -1 is returned and errno is specified to indicate the error.
ERRORS
If the socketpair() function fails, errno may be set to one of the fol‐
lowing values: The process have not have appropriate privileges. The
addresses in the specified address family cannot be used to create this
socket pair. [Tru64 UNIX] The socket_vector array is not located in a
writable part of user address space. The current process has too many
open file descriptors. No more file descriptors are available for the
system. Insufficient resources were available in the system to com‐
plete the call. The system was unable to allocate kernel memory to
increase the process descriptor table. The available STREAMS resources
were insufficient for the operation to complete. The specified proto‐
col does not permit creation of socket pairs. The specified protocol
cannot be used in this system. The socket type is not supported by the
protocol.
SEE ALSO
Functions: socket(2)
Standards: standards(5)
Network Programmer's Guide
socketpair(2)