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>GETPEERNAME(2)                System Calls Manual               GETPEERNAME(2)
 
NAME
     getpeername - get name of connected peer
 
SYNOPSIS
     #include &lt;sys/types.h&#62;
     #include &lt;sys/socket.h&#62;
 
     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
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85			`NAME="NET-COMMON-TCPIP-MANPAGES-GETPEERNAME">getpeername</H1`
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94			`>GETPEERNAME(2) System Calls Manual GETPEERNAME(2)`
95
96			`NAME`
97			`getpeername - get name of connected peer`
98
99			`SYNOPSIS`
100			`#include <sys/types.h>`
101			`#include <sys/socket.h>`
102
103			`int`
104			`getpeername(int s, struct sockaddr name, socklen_t namelen);`
105
106			`DESCRIPTION`
107			`getpeername() returns the address information of the peer connected to`
108			`socket s. One common use occurs when a process inherits an open socket,`
109			`such as TCP servers forked from inetd(8). In this scenario,`
110			`getpeername() is used to determine the connecting client's IP address.`
111
112			`getpeername() takes three parameters:`
113
114			`s Contains the file descriptor of the socket whose peer should be looked`
115			`up.`
116
117			`name Points to a sockaddr structure that will hold the address informa-`
118			`tion for the connected peer. Normal use requires one to use a structure`
119			`specific to the protocol family in use, such as sockaddr_in (IPv4) or`
120			`sockaddr_in6 (IPv6), cast to a (struct sockaddr *).`
121
122			`For greater portability, especially with the newer protocol families, the`
123			`new struct sockaddr_storage should be used. sockaddr_storage is large`
124			`enough to hold any of the other sockaddr_* variants. On return, it can`
125			`be cast to the correct sockaddr type, based the protocol family contained`
126			`in its ss_family field.`
127
128			`namelen Indicates the amount of space pointed to by name, in bytes.`
129
130			`If address information for the local end of the socket is required, the`
131			`getsockname(2) function should be used instead.`
132
133			`If name does not point to enough space to hold the entire socket address,`
134			`the result will be truncated to namelen bytes.`
135
136			`RETURN VALUES`
137			`If the call succeeds, a 0 is returned and namelen is set to the actual`
138			`size of the socket address returned in name. Otherwise, errno is set and`
139			`a value of -1 is returned.`
140
141			`ERRORS`
142			`On failure, errno is set to one of the following:`
143
144			`[EBADF] The argument s is not a valid descriptor.`
145
146			`[ENOTSOCK] The argument s is a file, not a socket.`
147
148			`[ENOTCONN] The socket is not connected.`
149
150			`[ENOBUFS] Insufficient resources were available in the system to`
151			`perform the operation.`
152
153			`[EFAULT] The name parameter points to memory not in a valid`
154			`part of the process address space.`
155
156			`SEE ALSO`
157			`accept(2), bind(2), getsockname(2), getpeereid(2), socket(2)`
158
159			`HISTORY`
160			`The getpeername() function call appeared in 4.2BSD.`
161
162			`BSD July 17, 1999 BSD`
163			`</PRE`
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