Manpage of SOCKETPAIR
SOCKETPAIRSection: Linux Programmer's Manual (2)
NAMEsocketpair - create a pair of connected sockets
SYNOPSIS#include <sys/types.h> /* See NOTES */
DESCRIPTIONThe 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).
RETURN VALUEOn success, zero is returned. On error, -1 is returned, and errnois set appropriately.
- The specified address family is not supported on this machine.
- The address svdoes not specify a valid part of the process address space.
- The per-process limit on the number of open file descriptors has been reached.
- The system-wide limit on the total number of open files has been reached.
- The specified protocol does not support creation of socket pairs.
- The specified protocol is not supported on this machine.
CONFORMING TOPOSIX.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).
NOTESOn Linux, the only supported domain for this call is AF_UNIX(or synonymously, AF_LOCAL). (Most implementations have the same restriction.)
Since Linux 2.6.27, socketpair() supports the SOCK_NONBLOCKand SOCK_CLOEXECflags in the typeargument, as described in socket(2).
POSIX.1 does not require the inclusion of <sys/types.h>, and this header file is not required on Linux. However, some historical (BSD) implementations required this header file, and portable applications are probably wise to include it.
SEE ALSOpipe(2), read(2), socket(2), write(2), socket(7), unix(7)
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