src/udev/udev-ctrl.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 #pragma once
   3
   4 #include "sd-event.h"
   5
   6 #include "macro.h"
   7 #include "time-util.h"
   8
   9 struct udev_ctrl;
  10
  11 enum udev_ctrl_msg_type {
  12         _UDEV_CTRL_END_MESSAGES,
  13         UDEV_CTRL_SET_LOG_LEVEL,
  14         UDEV_CTRL_STOP_EXEC_QUEUE,
  15         UDEV_CTRL_START_EXEC_QUEUE,
  16         UDEV_CTRL_RELOAD,
  17         UDEV_CTRL_SET_ENV,
  18         UDEV_CTRL_SET_CHILDREN_MAX,
  19         UDEV_CTRL_PING,
  20         UDEV_CTRL_EXIT,
  21 };
  22
  23 union udev_ctrl_msg_value {
  24         int intval;
  25         char buf[256];
  26 };
  27
  28 typedef int (*udev_ctrl_handler_t)(struct udev_ctrl *udev_ctrl, enum udev_ctrl_msg_type type,
  29                                    const union udev_ctrl_msg_value *value, void *userdata);
  30
  31 int udev_ctrl_new_from_fd(struct udev_ctrl **ret, int fd);
  32 static inline int udev_ctrl_new(struct udev_ctrl **ret) {
  33         return udev_ctrl_new_from_fd(ret, -1);
  34 }
  35
  36 int udev_ctrl_enable_receiving(struct udev_ctrl *uctrl);
  37 struct udev_ctrl *udev_ctrl_ref(struct udev_ctrl *uctrl);
  38 struct udev_ctrl *udev_ctrl_unref(struct udev_ctrl *uctrl);
  39 int udev_ctrl_cleanup(struct udev_ctrl *uctrl);
  40 int udev_ctrl_attach_event(struct udev_ctrl *uctrl, sd_event *event);
  41 int udev_ctrl_start(struct udev_ctrl *uctrl, udev_ctrl_handler_t callback, void *userdata);
  42 sd_event_source *udev_ctrl_get_event_source(struct udev_ctrl *uctrl);
  43
  44 int udev_ctrl_wait(struct udev_ctrl *uctrl, usec_t timeout);
  45
  46 int udev_ctrl_send(struct udev_ctrl *uctrl, enum udev_ctrl_msg_type type, int intval, const char *buf);
  47 static inline int udev_ctrl_send_set_log_level(struct udev_ctrl *uctrl, int priority) {
  48         return udev_ctrl_send(uctrl, UDEV_CTRL_SET_LOG_LEVEL, priority, NULL);
  49 }
  50
  51 static inline int udev_ctrl_send_stop_exec_queue(struct udev_ctrl *uctrl) {
  52         return udev_ctrl_send(uctrl, UDEV_CTRL_STOP_EXEC_QUEUE, 0, NULL);
  53 }
  54
  55 static inline int udev_ctrl_send_start_exec_queue(struct udev_ctrl *uctrl) {
  56         return udev_ctrl_send(uctrl, UDEV_CTRL_START_EXEC_QUEUE, 0, NULL);
  57 }
  58
  59 static inline int udev_ctrl_send_reload(struct udev_ctrl *uctrl) {
  60         return udev_ctrl_send(uctrl, UDEV_CTRL_RELOAD, 0, NULL);
  61 }
  62
  63 static inline int udev_ctrl_send_set_env(struct udev_ctrl *uctrl, const char *key) {
  64         return udev_ctrl_send(uctrl, UDEV_CTRL_SET_ENV, 0, key);
  65 }
  66
  67 static inline int udev_ctrl_send_set_children_max(struct udev_ctrl *uctrl, int count) {
  68         return udev_ctrl_send(uctrl, UDEV_CTRL_SET_CHILDREN_MAX, count, NULL);
  69 }
  70
  71 static inline int udev_ctrl_send_ping(struct udev_ctrl *uctrl) {
  72         return udev_ctrl_send(uctrl, UDEV_CTRL_PING, 0, NULL);
  73 }
  74
  75 static inline int udev_ctrl_send_exit(struct udev_ctrl *uctrl) {
  76         return udev_ctrl_send(uctrl, UDEV_CTRL_EXIT, 0, NULL);
  77 }
  78
  79 DEFINE_TRIVIAL_CLEANUP_FUNC(struct udev_ctrl*, udev_ctrl_unref);