NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON
GETPEERNAME(2) Linux Programmer's Manual GETPEERNAME(2)
getpeername - get name of connected peer socket
#include <sys/socket.h>
int getpeername(int sockfd, struct sockaddr *addr, socklen_t *addrlen);
getpeername() returns the address of the peer connected to the socket sockfd,
in the buffer pointed to by addr. The addrlen argument should be initialized
to indicate the amount of space pointed to by addr. On return it contains the
actual size of the name returned (in bytes). The name is truncated if the
buffer provided is too small.
The returned address is truncated if the buffer provided is too small; in this
case, addrlen will return a value greater than was supplied to the call.
On success, zero is returned. On error, -1 is returned, and errno is set
appropriately.
EBADF The argument sockfd is not a valid descriptor.
EFAULT The addr argument points to memory not in a valid part of the process
address space.
EINVAL addrlen 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 sockfd is a file, not a socket.
SVr4, 4.4BSD (the getpeername() function call first appeared in 4.2BSD),
POSIX.1-2001.
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), ip(7), socket(7), unix(7)
This page is part of release 3.23 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 2008-12-03 GETPEERNAME(2)