/usr/include/libnl3/netlink/socket.h is in libnl-3-dev 3.2.3-2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* netlink/socket.h Netlink Socket
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation version 2.1
* of the License.
*
* Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
*/
#ifndef NETLINK_SOCKET_H_
#define NETLINK_SOCKET_H_
#include <netlink/types.h>
#include <netlink/handlers.h>
#ifdef __cplusplus
extern "C" {
#endif
extern struct nl_sock * nl_socket_alloc(void);
extern struct nl_sock * nl_socket_alloc_cb(struct nl_cb *);
extern void nl_socket_free(struct nl_sock *);
extern uint32_t nl_socket_get_local_port(const struct nl_sock *);
extern void nl_socket_set_local_port(struct nl_sock *, uint32_t);
extern int nl_socket_add_memberships(struct nl_sock *, int, ...);
extern int nl_socket_add_membership(struct nl_sock *, int);
extern int nl_socket_drop_memberships(struct nl_sock *, int, ...);
extern int nl_socket_drop_membership(struct nl_sock *,
int);
extern void nl_join_groups(struct nl_sock *, int);
extern uint32_t nl_socket_get_peer_port(const struct nl_sock *);
extern void nl_socket_set_peer_port(struct nl_sock *,
uint32_t);
extern uint32_t nl_socket_get_peer_groups(const struct nl_sock *sk);
extern void nl_socket_set_peer_groups(struct nl_sock *sk, uint32_t groups);
extern struct nl_cb * nl_socket_get_cb(const struct nl_sock *);
extern void nl_socket_set_cb(struct nl_sock *,
struct nl_cb *);
extern int nl_socket_modify_cb(struct nl_sock *, enum nl_cb_type,
enum nl_cb_kind,
nl_recvmsg_msg_cb_t, void *);
extern int nl_socket_modify_err_cb(struct nl_sock *, enum nl_cb_kind,
nl_recvmsg_err_cb_t, void *);
extern int nl_socket_set_buffer_size(struct nl_sock *, int, int);
extern int nl_socket_set_passcred(struct nl_sock *, int);
extern int nl_socket_recv_pktinfo(struct nl_sock *, int);
extern void nl_socket_disable_seq_check(struct nl_sock *);
extern unsigned int nl_socket_use_seq(struct nl_sock *);
extern void nl_socket_disable_auto_ack(struct nl_sock *);
extern void nl_socket_enable_auto_ack(struct nl_sock *);
extern int nl_socket_get_fd(const struct nl_sock *);
extern int nl_socket_set_nonblocking(const struct nl_sock *);
extern void nl_socket_enable_msg_peek(struct nl_sock *);
extern void nl_socket_disable_msg_peek(struct nl_sock *);
#ifdef __cplusplus
}
#endif
#endif
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