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SOCKETPAIR(2) Linux Programmer's Manual SOCKETPAIR(2) NAME socketpair - create a pair of connected sockets SYNOPSIS #include <sys/socket.h> int socketpair(int domain, int type, int protocol, int sv[2]); DESCRIPTION The socketpair() call creates an unnamed pair of connected sockets in the specified domain, of the specified type, and using the optionally specified protocol. For further details of these arguments, see socket(2). The file descriptors used in referencing the new sockets are returned in sv[0] and sv[1]. The two sockets are indistinguishable. RETURN VALUE On success, zero is returned. On error, -1 is returned, errno is set to indicate the error, and sv is left unchanged On Linux (and other systems), socketpair() does not modify sv on failure. A requirement standardizing this behavior was added in POSIX.1-2008 TC2. ERRORS EAFNOSUPPORT The specified address family is not supported on this machine. EFAULT The address sv does not specify a valid part of the process address space. EMFILE The per-process limit on the number of open file descriptors has been reached. ENFILE The system-wide limit on the total number of open files has been reached. EOPNOTSUPP The specified protocol does not support creation of socket pairs. EPROTONOSUPPORT The specified protocol is not supported on this machine. CONFORMING TO POSIX.1-2001, POSIX.1-2008, 4.4BSD. socketpair() first appeared in 4.2BSD. It is generally portable to/from non-BSD systems supporting clones of the BSD socket layer (including System V variants). NOTES On Linux, the only supported domains for this call are AF_UNIX (or synonymously, AF_LOCAL) and AF_TIPC (since Linux 4.12). Since Linux 2.6.27, socketpair() supports the SOCK_NONBLOCK and SOCK_CLOEXEC flags in the type argument, as described in socket(2). SEE ALSO pipe(2), read(2), socket(2), write(2), socket(7), unix(7) Linux 2021-03-22 SOCKETPAIR(2)