net_ns.cc File Reference

#include "sql-common/net_ns.h"
#include <assert.h>
#include <sched.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <map>
#include <mutex>
#include <unordered_map>
#include "my_sys.h"
#include "mysql/components/services/log_builtins.h"
#include "mysqld_error.h"

Macros
#define	_GNU_SOURCE

Typedefs
using	namespaces_registry_t = std::map< std::string, int >

Functions
static bool	open_network_namespace (const std::string &network_namespace, int *fd)
	Open a network namespace specified by function argument. More...
static bool	save_original_network_namespace (int *orig_ns_fd)
	Remember a file descriptor corresponding to the current active network namespace. More...
bool	set_network_namespace (const std::string &network_namespace)
	Set active network namespace specified by a name. More...
bool	restore_original_network_namespace ()
	Restore original network namespace used to be active before a new network namespace has been set. More...
void	release_network_namespace_resources ()
	Close file descriptors for every opened network namespace file and release a memory used by internal cache of opened network namespaces. More...

Variables
static namespaces_registry_t	opened_namespaces
static std::mutex	lock
static int	original_ns_fd = -1

Macro Definition Documentation

_GNU_SOURCE

#define _GNU_SOURCE

Typedef Documentation

namespaces_registry_t

using namespaces_registry_t = std::map<std::string, int>

Function Documentation

open_network_namespace()

static bool open_network_namespace ( const std::string &  network_namespace, int *  fd  )

static

Open a network namespace specified by function argument.

Parameters

	network_namespace	a name of the network namespace to open
[out]	fd	file descriptor corresponding to the opened network namespace

Returns

false on success, true on failure

release_network_namespace_resources()

void release_network_namespace_resources

(

)

Close file descriptors for every opened network namespace file and release a memory used by internal cache of opened network namespaces.

restore_original_network_namespace()

bool restore_original_network_namespace

(

)

Restore original network namespace used to be active before a new network namespace has been set.

Returns

false on success, true on failure

save_original_network_namespace()

static bool save_original_network_namespace ( int *  orig_ns_fd )

static

Remember a file descriptor corresponding to the current active network namespace.

Parameters

[out]

orig_ns_fd

file descriptor corresponding to a network namespace used to be active before

Returns

false on success, true on failure

set_network_namespace()

bool set_network_namespace

(

const std::string &

network_namespace

)

Set active network namespace specified by a name.

Parameters

network_namespace

the name of a network namespace to be set active

Returns

false on success, true on error

Note

all opened descriptors used during function run are closed on error

Variable Documentation

lock

std::mutex lock

static

opened_namespaces

namespaces_registry_t opened_namespaces

static

original_ns_fd

int original_ns_fd = -1

static