diff options
Diffstat (limited to 'src/bus.py')
| -rw-r--r-- | src/bus.py | 83 |
1 files changed, 79 insertions, 4 deletions
@@ -57,7 +57,7 @@ class Bus: NOWAIT = 1 ''' - Function shall fail with errno set to `EAGAIN` + Function shall fail with `os.errno.EAGAIN` if the it would block and this flag is used ''' @@ -141,9 +141,10 @@ class Bus: ''' Broadcast a message a bus - @param message:str The message to write, may not be longer than 2047 bytes after UTF-8 encoding - @param flags:int `Bus.NOWAIT` if the function shall fail if there is another process attempting - to broadcast on the bus + @param message:str The message to write, may not be longer than 2047 bytes + after UTF-8 encoding + @param flags:int `Bus.NOWAIT` if the function shall fail with `os.errno.EAGAIN` + if there is another process attempting to broadcast on the bus ''' from native_bus import bus_write_wrapped if bus_write_wrapped(self.bus, message, flags) == -1: @@ -178,6 +179,80 @@ class Bus: raise self.__oserror() + def poll_start(self, flags : int = 0): + ''' + Announce that the thread is listening on the bus. + This is required so the will does not miss any + messages due to race conditions. Additionally, + not calling this function will cause the bus the + misbehave, is `Bus.poll` is written to expect + this function to have been called. + + @param flags:int `Bus.NOWAIT` if the bus should fail with `os.errno.EAGAIN` + if there isn't already a message available on the bus when + `Bus.poll` is called + ''' + from native_bus import bus_poll_start_wrapped + if bus_poll_start_wrapped(self.bus, flags) == -1: + raise self.__oserror() + + + def poll_stop(self): + ''' + Announce that the thread has stopped listening on the bus. + This is required so that the thread does not cause others + to wait indefinitely. + ''' + from native_bus import bus_poll_stop_wrapped + if bus_poll_stop_wrapped(self.bus) == -1: + raise self.__oserror() + + + def poll(self) -> str: + ''' + Wait for a message to be broadcasted on the bus. + The caller should make a copy of the received message, + without freeing the original copy, and parse it in a + separate thread. When the new thread has started be + started, the caller of this function should then + either call `Bus.poll` again or `Bus.poll_stop`. + + @return :str The received message + ''' + from native_bus import bus_poll_wrapped + if bus_poll_wrapped(self.bus) == None: + raise self.__oserror() + + + def chown(self, owner : int, group : int): + ''' + Change the ownership of a bus + + `os.stat` can be used of the bus's associated file to get the bus's ownership + + @param owner:int The user ID of the bus's new owner + @param group:int The group ID of the bus's new group + ''' + from native_bus import bus_chown_wrapped + if bus_chown_wrapped(self.pathname, owner, group) == -1: + raise self.__oserror() + + + def chmod(self, mode : int): + ''' + Change the permissions for a bus + + `os.stat` can be used of the bus's associated file to get the bus's permissions + + @param mode:int The permissions of the bus, any permission for a user implies + full permissions for that user, except only the owner may + edit the bus's associated file + ''' + from native_bus import bus_chmod_wrapped + if bus_chmod_wrapped(self.pathname, mode) == -1: + raise self.__oserror() + + def __oserror(self): ''' Create an OSError |