getsockname(2)

NAME
getsockname - get socket name

LIBRARY
Standard C library (libc, -lc)

SYNOPSIS
#include <sys/socket.h>

int getsockname(int sockfd, struct sockaddr *restrict addr,
                socklen_t *restrict 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 to indicate the error.

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.

STANDARDS
POSIX.1-2024.

HISTORY
POSIX.1-2001, SVr4, 4.2BSD.

SEE ALSO
bind(2), socket(2), getifaddrs(3), ip(7), socket(7), unix(7)