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 buf-
fer 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
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.
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
EBADF The argument sockfd is not a valid descriptor.
EFAULT The addr argument points to memory not in a valid part of the process address
EINVAL addrlen is invalid (e.g., is negative).
Insufficient resources were available in the system to perform the operation.
The argument sockfd is a file, not a socket.
SVr4, 4.4BSD (the getsockname() function call appeared in 4.2BSD), POSIX.1-2001.
The third argument of getsockname() is in reality an int * (and this is what 4.x BSD and
libc4 and libc5 have). Some POSIX confusion resulted in the present socklen_t, also used
by glibc. See also accept(2).
bind(2), socket(2), getifaddrs(3), ip(7), socket(7), unix(7)
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Linux 2008-12-03 GETSOCKNAME(2)