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RedHat 9 (Linux i386) - man page for getpeername (redhat section 2)

GETPEERNAME(2)						     Linux Programmer's Manual						    GETPEERNAME(2)

getpeername - get name of connected peer socket
#include <sys/socket.h> int getpeername(int s, struct sockaddr *name, socklen_t *namelen);
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 pro- vided is too small.
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
EBADF The argument s is not a valid descriptor. ENOTSOCK The argument s is a file, not a socket. ENOTCONN The socket is not connected. ENOBUFS Insufficient resources were available in the system to perform the operation. EFAULT The name parameter points to memory not in a valid part of the process address space.
SVr4, 4.4BSD (the getpeername function call first appeared in 4.2BSD).
The third argument of getpeername is in reality an `int *' (and this is what BSD 4.* and libc4 and libc5 have). Some POSIX confusion resulted in the present socklen_t. The draft standard has not been adopted yet, but glibc2 already follows it and also has socklen_t. See also accept(2).
accept(2), bind(2), getsockname(2) BSD Man Page 1993-07-30 GETPEERNAME(2)