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getsockname(2) [mojave man page]

GETSOCKNAME(2)						      BSD System Calls Manual						    GETSOCKNAME(2)

NAME
getsockname -- get socket name SYNOPSIS
#include <sys/socket.h> int getsockname(int socket, struct sockaddr *restrict address, socklen_t *restrict address_len); DESCRIPTION
The getsockname() function returns the current address for the specified socket. The address_len parameter should be initialized to indicate the amount of space pointed to by address. On return it contains the actual size of the address returned (in bytes). The address is truncated if the buffer provided is too small. RETURN VALUES
The getsockname() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error. ERRORS
The getsockname() system call will succeed unless: [EBADF] The argument socket is not a valid file descriptor. [EFAULT] The address parameter points to memory not in a valid part of the process address space. [EINVAL] socket has been shut down. [ENOBUFS] Insufficient resources were available in the system to perform the operation. [ENOTSOCK] The argument socket is not a socket (e.g., a plain file). [EOPNOTSUPP] getsockname() is not supported for the protocol in use by socket. SEE ALSO
bind(2), socket(2) BUGS
Names bound to sockets in the UNIX domain are inaccessible; getsockname() returns a zero-length address. HISTORY
The getsockname() call appeared in 4.2BSD. 4.2 Berkeley Distribution June 4, 1993 4.2 Berkeley Distribution

Check Out this Related Man Page

GETPEERNAME(2)						      BSD System Calls Manual						    GETPEERNAME(2)

NAME
getpeername -- get address of connected peer SYNOPSIS
#include <sys/socket.h> int getpeername(int socket, struct sockaddr *restrict address, socklen_t *restrict address_len); DESCRIPTION
The getpeername() function returns the address of the peer connected to the specified socket. The address_len parameter should be initialized to indicate the amount of space pointed to by address. On return it contains the actual size of the address returned (in bytes). The address is truncated if the buffer provided is too small. RETURN VALUES
The getpeername() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error. ERRORS
The call succeeds unless: [EBADF] The argument socket is not a valid descriptor. [EFAULT] The address parameter points to memory not in a valid part of the process address space. [EINVAL] socket has been shut down. [ENOBUFS] Insufficient resources were available in the system to perform the operation. [ENOTCONN] Either the socket is not connected or it has not had the peer pre-specified. [ENOTSOCK] The argument socket refers to something other than a socket (e.g., a file). [EOPNOTSUPP] getpeername() is not supported for the protocol in use by socket. SEE ALSO
accept(2), bind(2), getsockname(2), socket(2) HISTORY
The getpeername() function call appeared in 4.2BSD. 4.2 Berkeley Distribution June 4, 1993 4.2 Berkeley Distribution

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