getpeername(2) [netbsd man page]

GETPEERNAME(2)						      BSD System Calls Manual						    GETPEERNAME(2)

NAME

     getpeername -- get name of connected peer

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <sys/socket.h>

     int
     getpeername(int s, struct sockaddr * restrict name, socklen_t * restrict namelen);

DESCRIPTION

     The getpeername() function returns the name of the peer connected to the socket s.  One common use occurs when a process inherits an open
     socket, such as TCP servers forked from inetd(8).	In this scenario, getpeername() is used to determine the connecting client's IP address.

     The function takes three parameters:

	   s	    contains the file descriptor of the socket whose peer should be looked up.

	   name     points to a sockaddr structure that will hold the address information for the connected peer.  Normal use requires one to use
		    a structure specific to the protocol family in use, such as sockaddr_in (IPv4) or sockaddr_in6 (IPv6), cast to a (struct sock-
		    addr *).

		    For greater portability, especially with the newer protocol families, the new struct sockaddr_storage should be used.
		    sockaddr_storage is large enough to hold any of the other sockaddr_* variants.  On return, it can be cast to the correct sock-
		    addr type, based on the protocol family contained in its ss_family field.

	   namelen  indicates the amount of space pointed to by name, in bytes.

     If address information for the local end of the socket is required, the getsockname(2) function should be used instead.

     If name does not point to enough space to hold the entire socket address, the result will be truncated to namelen bytes.

RETURN VALUES

     If the call succeeds, a 0 is returned and namelen is set to the actual size of the socket address returned in name.  Otherwise, errno is set
     and a value of -1 is returned.

ERRORS

     The call succeeds unless:

     [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.

     [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.

SEE ALSO

     accept(2), bind(2), getsockname(2), socket(2)

STANDARDS

     The function conforms to IEEE Std 1003.1-2008 (``POSIX.1'').

HISTORY

     The getpeername() function call appeared in 4.2BSD.

BSD
								   June 3, 2011 							       BSD

Check Out this Related Man Page

getpeername(3XNET)				   X/Open Networking Services Library Functions 				getpeername(3XNET)

NAME

       getpeername - get the name of the peer socket

SYNOPSIS

       cc [ flag ... ] file ... -lxnet [ library ... ]
       #include <sys/socket.h>

       int getpeername(int socket, struct sockaddr *restrict address, socklen_t *restrict address_len);

DESCRIPTION

       The  getpeername() function retrieves the peer address of the specified socket, stores this address in the sockaddr structure pointed to by
       the address argument, and stores the length of this address in the object pointed to by the address_len argument.

       If the actual length of the address is greater than the length of the supplied sockaddr structure, the stored address will be truncated.

       If the protocol permits connections by unbound clients, and the peer is not bound, then the value  stored  in  the  object  pointed  to	by
       address is unspecified.

RETURN VALUES

       Upon successful completion, 0 is returned.  Otherwise, -1 is returned and errno is set to indicate the error.

ERRORS

       The getpeername() function will fail if:

       EBADF	       The socket argument is not a valid file descriptor.

       EFAULT	       The  address or	address_len parameter can not be accessed or written.

       EINVAL	       The socket has been shut down.

       ENOTCONN        The socket is not connected or otherwise has not had the peer prespecified.

       ENOTSOCK        The socket argument does not refer to a socket.

       EOPNOTSUPP      The operation is not supported for the socket protocol.

       The getpeername() function may fail if:

       ENOBUFS	       Insufficient resources were available in the system to complete the call.

       ENOSR	       There were insufficient STREAMS resources available for the operation to complete.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       accept(3XNET), bind(3XNET), getsockname(3XNET), socket(3XNET), attributes(5), standards(5)

SunOS 5.10							    10 Jun 2002 						getpeername(3XNET)

Linux and UNIX Man Pages

getpeername(2) [netbsd man page]

Check Out this Related Man Page