socketpair - create a pair of connected sockets
#include <sys/socket.h> int socketpair(int domain, int type, int protocol, int sv);
The socketpair() library call creates an unnamed pair of connected sockets in the specified address family domain, of the specified type, that uses the optionally specified protocol. The descriptors that are used in referencing the new sockets are returned in sv and sv. The two sockets are indistinguishable.
Some file descriptor flags can be specified at socket creation time to avoid race conditions. These options are passed by using a bitwise-inclusive-OR of flags with the value passed for the type parameter to the socket(). See the socket(3c) man page for the available flags.
socketpair() returns −1 on failure and 0 on success.
The call succeeds unless:
The specified address family is not supported on this machine.
Too many descriptors are in use by this process.
There was insufficient user memory for the operation to complete.
There were insufficient STREAMS resources for the operation to complete.
The specified protocol does not support creation of socket pairs.
The specified protocol is not supported on this machine.
The process does not have appropriate privileges.
See attributes(7) for descriptions of the following attributes:
This call is currently implemented only for the AF_UNIX address family.
Support for SOCK_* flags as part of the type parameter was added to Oracle Solaris in the 11.4 release.