1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: t -*-*/ 2 3 #ifndef fooreservemonitorhfoo 4 #define fooreservemonitorhfoo 5 6 /*** 7 Copyright 2009 Lennart Poettering 8 9 Permission is hereby granted, free of charge, to any person 10 obtaining a copy of this software and associated documentation files 11 (the "Software"), to deal in the Software without restriction, 12 including without limitation the rights to use, copy, modify, merge, 13 publish, distribute, sublicense, and/or sell copies of the Software, 14 and to permit persons to whom the Software is furnished to do so, 15 subject to the following conditions: 16 17 The above copyright notice and this permission notice shall be 18 included in all copies or substantial portions of the Software. 19 20 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 21 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 22 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 23 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 24 BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 25 ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 26 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 27 SOFTWARE. 28 ***/ 29 30 #include <dbus/dbus.h> 31 32 #ifdef __cplusplus 33 extern "C" { 34 #endif 35 36 typedef struct rm_monitor rm_monitor; 37 38 /* Prototype for a function that is called whenever the reservation 39 * device of a device changes. Use rm_monitor_busy() to find out the 40 * new state.*/ 41 typedef void (*rm_change_cb_t)(rm_monitor *m); 42 43 /* Creates a monitor for watching the lock status of a device. Returns 44 * 0 on success, a negative errno style return value on error. The 45 * DBus error might be set as well if the error was caused D-Bus. */ 46 int rm_watch( 47 rm_monitor **m, /* On success a pointer to the newly allocated rm_device object will be filled in here */ 48 DBusConnection *connection, /* Session bus (when D-Bus learns about user busses we should switch to user busses) */ 49 const char *device_name, /* The device to monitor, e.g. "Audio0" */ 50 rm_change_cb_t change_cb, /* Will be called whenever the lock status changes. May be NULL */ 51 DBusError *error); /* If we fail due to a D-Bus related issue the error will be filled in here. May be NULL. */ 52 53 /* Free a rm_monitor object */ 54 void rm_release(rm_monitor *m); 55 56 /* Checks whether the device is currently reserved, and returns 1 57 * then, 0 if not, negative errno style error code value on error. */ 58 int rm_busy(rm_monitor *m); 59 60 /* Attach a userdata pointer to an rm_monitor */ 61 void rm_set_userdata(rm_monitor *m, void *userdata); 62 63 /* Query the userdata pointer from an rm_monitor. Returns NULL if no 64 * userdata was set. */ 65 void* rm_get_userdata(rm_monitor *m); 66 67 #ifdef __cplusplus 68 } 69 #endif 70 71 #endif 72