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->GETPEERNAME(2) System Calls Manual GETPEERNAME(2)
-
-NAME
- getpeername - get name of connected peer
-
-SYNOPSIS
- #include <sys/types.h>
- #include <sys/socket.h>
-
- int
- getpeername(int s, struct sockaddr *name, socklen_t *namelen);
-
-DESCRIPTION
- 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
- up.
-
- 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 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
- 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
- perform the operation.
-
- [EFAULT] The name parameter points to memory not in a valid
- part of the process address space.
-
-SEE ALSO
- accept(2), bind(2), getsockname(2), getpeereid(2), socket(2)
-
-HISTORY
- The getpeername() function call appeared in 4.2BSD.
-
-BSD July 17, 1999 BSD
- </PRE
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