GETSOCKNAME(2) Linux Programmer's Manual GETSOCKNAME(2)
getsockname - get socket name
int getsockname(int sockfd, struct sockaddr *addr, socklen_t *addrlen);
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
On success, zero is returned. On error, -1 is returned, and errno is
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).
Insufficient resources were available in the system to perform
The file descriptor sockfd does not refer to a socket.
POSIX.1-2001, POSIX.1-2008, SVr4, 4.4BSD (getsockname() first appeared
For background on the socklen_t type, see accept(2).
bind(2), socket(2), getifaddrs(3), ip(7), socket(7), unix(7)
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Linux 2017-09-15 GETSOCKNAME(2)