GETPEERNAME(2) Linux Programmer s Manual GETPEERNAME(2)
NAME getpeername - get name of connected peer socket
SYNOPSIS #include <sys/socket.h>
int getpeername(int s, struct sockaddr *name, socklen_t *namelen);
DESCRIPTION getpeername() returns the name of the peer connected to socket s. The namelen parameter should be initialized to indicate the amount of space pointed to by name. On return it contains the actual size of the name returned (in bytes). The name is truncated if the buffer provided is too small.
RETURN VALUE On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORS EBADF The argument s is not a valid descriptor.
EFAULT The name parameter points to memory not in a valid part of the process address space.
EINVAL namelen is invalid (e.g., is negative).
ENOBUFS Insufficient resources were available in the system to perform the operation.
ENOTCONN The socket is not connected.
ENOTSOCK The argument s is a file, not a socket.
CONFORMING TO SVr4, 4.4BSD (the getpeername() function call first appeared in 4.2BSD), POSIX.1-2001.
NOTE The third argument of getpeername() is in reality an int * (and this is what 4.x BSD and libc4 and libc5 have). Some POSIX confusion resulted in the present socklen_t, also used by glibc. See also accept(2).
SEE ALSO accept(2), bind(2), getsockname(2)
BSD Man Page 1993-07-30 GETPEERNAME(2)