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NAME="NET-COMMON-TCPIP-MANPAGES-GETPEERNAME">getpeername</H1
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NAME="NET-COMMON-TCPIP-MANPAGES-GETPEERNAME">getpeername</H1
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>GETPEERNAME(2) System Calls Manual GETPEERNAME(2)
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>GETPEERNAME(2) System Calls Manual GETPEERNAME(2)
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NAME
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NAME
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getpeername - get name of connected peer
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getpeername - get name of connected peer
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SYNOPSIS
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SYNOPSIS
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#include <sys/types.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/socket.h>
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int
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int
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getpeername(int s, struct sockaddr *name, socklen_t *namelen);
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getpeername(int s, struct sockaddr *name, socklen_t *namelen);
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DESCRIPTION
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DESCRIPTION
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getpeername() returns the address information of the peer connected to
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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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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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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() is used to determine the connecting client's IP address.
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getpeername() takes three parameters:
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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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s Contains the file descriptor of the socket whose peer should be looked
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up.
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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the result will be truncated to namelen bytes.
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RETURN VALUES
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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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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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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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a value of -1 is returned.
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ERRORS
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ERRORS
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On failure, errno is set to one of the following:
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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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[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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[ENOTSOCK] The argument s is a file, not a socket.
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[ENOTCONN] The socket is not connected.
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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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[ENOBUFS] Insufficient resources were available in the system to
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perform the operation.
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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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[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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part of the process address space.
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SEE ALSO
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SEE ALSO
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accept(2), bind(2), getsockname(2), getpeereid(2), socket(2)
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accept(2), bind(2), getsockname(2), getpeereid(2), socket(2)
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HISTORY
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HISTORY
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The getpeername() function call appeared in 4.2BSD.
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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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BSD July 17, 1999 BSD
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