MirBSD manpage: getpeername(2)

GETPEERNAME(2)             BSD Programmer's Manual              GETPEERNAME(2)


     getpeername - get name of connected peer


     #include <sys/types.h>
     #include <sys/socket.h>

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


     getpeername() returns the address information of the peer connected to
     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.

     getpeername() takes three parameters:

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

     name points to a sockaddr structure that will hold the address informa-
     tion 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 sockaddr *).

     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 sockaddr 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.


     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.


     On failure, errno is set to one of the following:

     [EBADF]       The argument s is not a valid descriptor.

     [ENOTSOCK]    The argument s is a file, not a socket.

     [ENOTCONN]    The socket is not connected.

     [ENOBUFS]     Insufficient resources were available in the system to per-
                   form the operation.

     [EFAULT]      The name parameter points to memory not in a valid part of
                   the process address space.


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


     The getpeername() function call appeared in 4.2BSD.

MirBSD #10-current              July 17, 1999                                1

Generated on 2022-12-24 01:00:14 by $MirOS: src/scripts/roff2htm,v 1.113 2022/12/21 23:14:31 tg Exp $ — This product includes material provided by mirabilos.

These manual pages and other documentation are copyrighted by their respective writers; their sources are available at the project’s CVSweb, AnonCVS and other mirrors. The rest is Copyright © 2002–2022 MirBSD.

This manual page’s HTML representation is supposed to be valid XHTML/1.1; if not, please send a bug report — diffs preferred.

Kontakt / Impressum & Datenschutzerklärung