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getsockname(2) System Calls Manual getsockname(2) NAME getsockname - Gets the socket name SYNOPSIS #include <sys/socket.h> int getsockname( int socket, struct sockaddr *address, size_t *ad- dress_len ); [Digital] The following definition of the getsockname() function does not conform to current standards and is supported only for backward compatibility (see standards(5)): #include <sys/socket.h> int getsockname( int socket, struct sockaddr *address, int *address_len ); STANDARDS Interfaces documented on this reference page conform to industry stan- dards as follows: getsockname(): XPG4-UNIX Refer to the standards(5) reference page for more information about in- dustry standards and associated tags. PARAMETERS Specifies the socket for which the local address is needed. Points to a sockaddr structure, the format of which is determined by the domain and by the behavior requested for the socket. The sockaddr structure is an overlay for a sockaddr_in or sockaddr_un structure, depending on which of the supported address families is active. [Digital] If the compile-time option _SOCKADDR_LEN is defined before the sys/socket.h header file is included, the sockaddr structure takes 4.4BSD behavior, with a field for specifying the length of the socket address. Otherwise, the default 4.3BSD sockaddr structure is used, with the length of the socket ad- dress assumed to be 14 bytes or less. If _SOCKADDR_LEN is defined, the 4.3BSD sockaddr structure is defined with the name osockaddr. Specifies the length of the sockaddr structure pointed to by the address parameter. DESCRIPTION The getsockname() function retrieves the locally bound address of the specified socket. A process created by another process can inherit open sockets. To use the inherited sockets, the created process may need to identify its ad- dress. The getsockname() function allows a process to retrieve the lo- cal address bound to the specified socket. A process can use the getpeername() function to determine the address of a destination socket in a socket connection. NOTES [Digital] When compiled in the X/Open UNIX environment, calls to the getsockname() function are internally renamed by prepending _E to the function name. When you are debugging a module that includes the get- sockname() function and for which _XOPEN_SOURCE_EXTENDED has been de- fined, use _Egetsockname to refer to the getsockname() call. See stan- dards(5) for further information. RETURN VALUES Upon successful completion, a value of 0 (zero) is returned, and the address_len parameter points to the size of the socket address. Other- wise, a value of -1 is returned and errno is set to indicate the error. ERRORS If the getsockname() function fails, errno may be set to one of the following values: The socket parameter is not valid. The address or address_len parameter is not in a writable part of the user address space. Insufficient resources are available in the system to complete the call. The socket parameter refers to a file, not a socket. The operation is not supported for this socket's protocol. RELATED INFORMATION Functions: accept(2), bind(2), getpeername(2), socket(2) Standards: standards(5) delim off getsockname(2)