socketpair2
Create a pair of connected sockets
Usage
#include <sys/types.h>
#include <sys/socket.h>
int
socketpair(int domain, int type, int protocol, int *sv);
Library
Standard C Library (libc, -lc)
Overview
The socketpair() 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, SOCK_CLOFORK 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.
Releases
87 releases since FreeBSD 2.0.5-RELEASE; the text changed 43 times.