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->GETSOCKNAME(2) System Calls Manual GETSOCKNAME(2)
-
-NAME
- getsockname - get socket name
-
-SYNOPSIS
- #include <sys/types.h>
- #include <sys/socket.h>
-
- int
- getsockname(int s, struct sockaddr *name, socklen_t *namelen);
-
-DESCRIPTION
- getsockname() returns the locally bound address information for a speci-
- fied socket.
-
- Common uses of this function are as follows:
-
- o When bind(2) is called with a port number of 0 (indicating the kernel
- should pick an ephemeral port) getsockname() is used to retrieve the
- kernel-assigned port number.
-
- o When a process calls bind(2) on a wildcard IP address, getsockname()
- is used to retrieve the local IP address for the connection.
-
- o When a function wishes to know the address family of a socket,
- getsockname() can be used.
-
- getsockname() takes three parameters:
-
- s, Contains the file desriptor for the socket to be looked up.
-
- name points to a sockaddr structure which will hold the resulting address
- information. 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 (such as newer protocol families) the new struc-
- ture sockaddr_storage exists. sockaddr_storage is large enough to hold
- any of the other sockaddr_* variants. On return, it should be cast to
- the correct sockaddr type, according to the current protocol family.
-
- namelen Indicates the amount of space pointed to by name, in bytes. Upon
- return, namelen is set to the actual size of the returned address infor-
- mation.
-
- If the address of the destination socket for a given socket connection is
- needed, the getpeername(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
- On success, getsockname() returns a 0, 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
- If getsockname() fails, 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.
-
- [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), getpeername(2), getpeereid(2), socket(2)
-
-BUGS
- Names bound to sockets in the UNIX domain are inaccessible; getsockname
- returns a zero length name.
-
-HISTORY
- The getsockname() function call appeared in 4.2BSD.
-
-BSD July 17, 1999 BSD
- </PRE
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