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>Chapter 38. TCP/IP Library Reference</TD
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>GETPEERNAME(2)                System Calls Manual               GETPEERNAME(2)
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NAME
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     getpeername - get name of connected peer
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SYNOPSIS
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     #include &lt;sys/types.h&#62;
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     #include &lt;sys/socket.h&#62;
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     int
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     getpeername(int s, struct sockaddr *name, socklen_t *namelen);
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DESCRIPTION
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     getpeername() returns the address information of the peer connected to
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     socket s.  One common use occurs when a process inherits an open socket,
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     such as TCP servers forked from inetd(8).  In this scenario,
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     getpeername() is used to determine the connecting client's IP address.
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     getpeername() takes three parameters:
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     s Contains the file descriptor of the socket whose peer should be looked
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     up.
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     name Points to a sockaddr structure that will hold the address informa-
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     tion for the connected peer.  Normal use requires one to use a structure
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     specific to the protocol family in use, such as sockaddr_in (IPv4) or
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     sockaddr_in6 (IPv6), cast to a (struct sockaddr *).
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     For greater portability, especially with the newer protocol families, the
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     new struct sockaddr_storage should be used.  sockaddr_storage is large
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     enough to hold any of the other sockaddr_* variants.  On return, it can
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     be cast to the correct sockaddr type, based the protocol family contained
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     in its ss_family field.
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     namelen Indicates the amount of space pointed to by name, in bytes.
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     If address information for the local end of the socket is required, the
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     getsockname(2) function should be used instead.
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     If name does not point to enough space to hold the entire socket address,
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     the result will be truncated to namelen bytes.
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RETURN VALUES
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     If the call succeeds, a 0 is returned and namelen is set to the actual
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     size of the socket address returned in name.  Otherwise, errno is set and
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     a value of -1 is returned.
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ERRORS
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     On failure, errno is set to one of the following:
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     [EBADF]            The argument s is not a valid descriptor.
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     [ENOTSOCK]         The argument s is a file, not a socket.
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     [ENOTCONN]         The socket is not connected.
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     [ENOBUFS]          Insufficient resources were available in the system to
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                        perform the operation.
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     [EFAULT]           The name parameter points to memory not in a valid
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                        part of the process address space.
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SEE ALSO
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     accept(2), bind(2), getsockname(2), getpeereid(2), socket(2)
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HISTORY
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     The getpeername() function call appeared in 4.2BSD.
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BSD                              July 17, 1999                             BSD
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