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man page for getsockname

GETSOCKNAME(2)						     Linux Programmer's Manual						    GETSOCKNAME(2)

getsockname - get socket name SYNOPSIS
#include <sys/socket.h> int getsockname(int sockfd, struct sockaddr *addr, socklen_t *addrlen); DESCRIPTION
getsockname() returns the current address to which the socket sockfd is bound, in the buffer pointed to by addr. The addrlen argument should be initialized to indicate the amount of space (in bytes) pointed to by addr. On return it contains the actual size of the socket address. The returned address is truncated if the buffer provided is too small; in this case, addrlen will return a value greater than was supplied to the call. RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately. ERRORS
EBADF The argument sockfd is not a valid file descriptor. EFAULT The addr argument points to memory not in a valid part of the process address space. EINVAL addrlen is invalid (e.g., is negative). ENOBUFS Insufficient resources were available in the system to perform the operation. ENOTSOCK The file descriptor sockfd does not refer to a socket. CONFORMING TO
POSIX.1-2001, POSIX.1-2008, SVr4, 4.4BSD (getsockname() first appeared in 4.2BSD). NOTES
For background on the socklen_t type, see accept(2). SEE ALSO
bind(2), socket(2), getifaddrs(3), ip(7), socket(7), unix(7) Linux 2017-09-15 GETSOCKNAME(2)

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