This is based on the patch by sagil@infinidat.com, but heavily modified.
Add a function nl_socket_set_fd(), I renamed it from nl_connect_fd().
Now nl_connect() and nl_socket_set_fd() are implemented independently as
they share little code. But they have similar functionality:
to initialize a libnl socket and set it's file descriptor.
A user who wants libnl to setup the socket can continue to use nl_connect().
A user with special requirements should setup the socket entirely. That includes
calling socket() (with or without SOCK_CLOEXEC), bind(), setting buffer size.
For the same reason I dropped nl_create_fd(). It didn't do much more then
calling socket() -- which the user can do directly.
https://github.com/thom311/libnl/pull/68
Signed-off-by: Thomas Haller <thaller@redhat.com>
- Added option to create socket (fd) without bind.
It is now possible to forward the socket fd to another child process...
...later use nl_connect_fd() to connect to socket from the child process.
- Added option to disable CLOEXEC even if defined (in socket.h)
'nl_socket_enable_cloexec' & 'nl_socket_disable_cloexec'
No change to current default behavior.
Signed-off-by: Sagi Lowenhardt <sagil@infinidat.com>
I have a patch against commit d378220c96
extending libnl with a facility to receive generic netlink messages sent
to multicast groups.
Essentially it add one new function genl_ctrl_resolve_grp which
prototype looks like this
int genl_ctrl_resolve_grp(struct nl_sock *sk, const char *family_name,
const char *grp_name)
It resolves the family name and the group name to group id. Then
the returned id can be used in nl_socket_add_membership to subscribe
to multicast messages.
Besides that it adds two more functions
uint32_t nl_socket_get_peer_groups(struct nl_sock *sk)
void nl_socket_set_peer_groups(struct nl_sock *sk, uint32_t groups)
allowing to modify the socket peer groups field. So it's possible to
multicast messages from the user space using the legacy interface.
Looks like there is no way (or I was not able to find one?) to modify
the netlink socket destination group from the user space, when the
group id is greater then 32.
Instead of calling the membership functions several times it is
helpfull to extend the API and make the single group functions a
special case.
The value 0 (NFNLGRP_NONE) terminates this list.
Example use:
nl_socket_add_memberships(sock, group_1, group_2, 0);
nl_socket_drop_memberships(sock, group_1, group_2, 0);
Signed-off-by: Holger Eitzenberger <holger@eitzenberger.org>
The idea of a common handle is long revised and only misleading,
nl_handle really represents a socket with some additional
action handlers assigned to it.
Alias for nl_handle is kept for backwards compatibility.
