GETPEERNAME(2) Linux Programmer's Manual GETPEERNAME(2)
getpeername - get name of connected peer socket
int getpeername(int s, struct sockaddr *name, socklen_t *namelen);
getpeername() returns the name of the peer connected to socket s. The
namelen argument 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
On success, zero is returned. On error, -1 is returned, and errno is
EBADF The argument s is not a valid descriptor.
EFAULT The name argument points to memory not in a valid part of the
process address space.
EINVAL namelen is invalid (e.g., is negative).
Insufficient resources were available in the system to perform
The socket is not connected.
The argument s is a file, not a socket.
SVr4, 4.4BSD (the getpeername() function call first appeared in
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).
accept(2), bind(2), getsockname(2)
This page is part of release 3.05 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 1993-07-30 GETPEERNAME(2)