Systemd/src/core/swap.h
Lennart Poettering 072993504e core: move enforcement of the start limit into per-unit-type code again
Let's move the enforcement of the per-unit start limit from unit.c into the
type-specific files again. For unit types that know a concept of "result" codes
this allows us to hook up the start limit condition to it with an explicit
result code. Also, this makes sure that the state checks in clal like
service_start() may be done before the start limit is checked, as the start
limit really should be checked last, right before everything has been verified
to be in order.

The generic start limit logic is left in unit.c, but the invocation of it is
moved into the per-type files, in the various xyz_start() functions, so that
they may place the check at the right location.

Note that this change drops the enforcement entirely from device, slice, target
and scope units, since these unit types generally may not fail activation, or
may only be activated a single time. This is also documented now.

Note that restores the "start-limit-hit" result code that existed before
6bf0f408e4 already in the service code. However,
it's not introduced for all units that have a result code concept.

Fixes #3166.
2016-05-02 13:08:00 +02:00

111 lines
3.1 KiB
C

#pragma once
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
Copyright 2010 Maarten Lankhorst
systemd 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; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include "libudev.h"
typedef struct Swap Swap;
typedef enum SwapExecCommand {
SWAP_EXEC_ACTIVATE,
SWAP_EXEC_DEACTIVATE,
_SWAP_EXEC_COMMAND_MAX,
_SWAP_EXEC_COMMAND_INVALID = -1
} SwapExecCommand;
typedef enum SwapResult {
SWAP_SUCCESS,
SWAP_FAILURE_RESOURCES,
SWAP_FAILURE_TIMEOUT,
SWAP_FAILURE_EXIT_CODE,
SWAP_FAILURE_SIGNAL,
SWAP_FAILURE_CORE_DUMP,
SWAP_FAILURE_START_LIMIT_HIT,
_SWAP_RESULT_MAX,
_SWAP_RESULT_INVALID = -1
} SwapResult;
typedef struct SwapParameters {
char *what;
char *options;
int priority;
} SwapParameters;
struct Swap {
Unit meta;
char *what;
/* If the device has already shown up, this is the device
* node, which might be different from what, due to
* symlinks */
char *devnode;
SwapParameters parameters_proc_swaps;
SwapParameters parameters_fragment;
bool from_proc_swaps:1;
bool from_fragment:1;
/* Used while looking for swaps that vanished or got added
* from/to /proc/swaps */
bool is_active:1;
bool just_activated:1;
bool reset_cpu_usage:1;
SwapResult result;
usec_t timeout_usec;
ExecCommand exec_command[_SWAP_EXEC_COMMAND_MAX];
ExecContext exec_context;
KillContext kill_context;
CGroupContext cgroup_context;
ExecRuntime *exec_runtime;
SwapState state, deserialized_state;
ExecCommand* control_command;
SwapExecCommand control_command_id;
pid_t control_pid;
sd_event_source *timer_event_source;
/* In order to be able to distinguish dependencies on
different device nodes we might end up creating multiple
devices for the same swap. We chain them up here. */
LIST_FIELDS(struct Swap, same_devnode);
};
extern const UnitVTable swap_vtable;
int swap_process_device_new(Manager *m, struct udev_device *dev);
int swap_process_device_remove(Manager *m, struct udev_device *dev);
const char* swap_exec_command_to_string(SwapExecCommand i) _const_;
SwapExecCommand swap_exec_command_from_string(const char *s) _pure_;
const char* swap_result_to_string(SwapResult i) _const_;
SwapResult swap_result_from_string(const char *s) _pure_;