Manpage of GETPEERNAME

GETPEERNAME

Section: Linux Programmer's Manual (2)
Updated: 2016-03-15
Index
 

NAME

getpeername - get name of connected peer socket  

SYNOPSIS

#include <sys/socket.h>

int getpeername(int sockfd, struct sockaddr *addr, socklen_t *addrlen); 

DESCRIPTION

getpeername() returns the address of the peer connected to the socket sockfd, in the buffer pointed to by addr. The addrlenargument 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, addrlenwill return a value greater than was supplied to the call.  

RETURN VALUE

On success, zero is returned. On error, -1 is returned, and errnois set appropriately.  

ERRORS

EBADF
The argument sockfdis not a valid file descriptor.
EFAULT
The addrargument points to memory not in a valid part of the process address space.
EINVAL
addrlenis 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 file descriptor sockfddoes not refer to a socket.
 

CONFORMING TO

POSIX.1-2001, POSIX.1-2008, SVr4, 4.4BSD (getpeername() first appeared in 4.2BSD).  

NOTES

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).

For stream sockets, once a connect(2) has been performed, either socket can call getpeername() to obtain the address of the peer socket. On the other hand, datagram sockets are connectionless. Calling connect(2) on a datagram socket merely sets the peer address for outgoing datagrams sent with write(2) or recv(2). The caller of connect(2) can use getpeername() to obtain the peer address that it earlier set for the socket. However, the peer socket is unaware of this information, and calling getpeername() on the peer socket will return no useful information (unless a connect(2) call was also executed on the peer). Note also that the receiver of a datagram can obtain the address of the sender when using recvfrom(2).  

SEE ALSO

accept(2), bind(2), getsockname(2), ip(7), socket(7), unix(7)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
CONFORMING TO
NOTES
SEE ALSO

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