Mmap - Memory-mapped File Support¶

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Maps size bytes from the file specified by the file descriptor fileno, and returns a mmap object. If size is 0, the maximum length of the map will probably be the present size of the file when mmap is known as. SHARED creates a mapping that’s shared with all different processes mapping the same areas of the file. WRITE, to specify that the pages could also be read or written. It's an error to specify both flags, prot and access. See the description of entry above for information on how to use this parameter. 0. offset have to be a multiple of ALLOCATIONGRANULARITY which is equal to PAGESIZE on Unix systems. If trackfd is False, the file descriptor specified by fileno will not be duplicated, and the resulting mmap object won't be related to the map’s underlying file. Because of this the size() and resize() strategies will fail. This mode is useful to restrict the number of open file descriptors.



To make sure validity of the created memory mapping the file specified by the descriptor fileno is internally routinely synchronized with the physical backing retailer on macOS. Changed in version 3.13: The trackfd parameter was added. Added in version 3.2: Context manager support. Closes the mmap. Subsequent calls to different methods of the thing will lead to a ValueError exception being raised. This is not going to shut the open file. True if the file is closed. Optional arguments begin and end are interpreted as in slice notation. Returns -1 on failure. Changed in model 3.5: Writable bytes-like object is now accepted. Flushes modifications made to the in-memory copy of a file again to disk. With out use of this name there isn't a assure that adjustments are written again earlier than the object is destroyed. If offset and size are specified, only adjustments to the given vary of bytes will likely be flushed to disk; in any other case, the entire extent of the mapping is flushed.



None is returned to point success. An exception is raised when the call failed. Changed in version 3.8: Beforehand, a nonzero value was returned on success; zero was returned on error under Windows. A zero worth was returned on success; an exception was raised on error below Unix. Ship recommendation option to the kernel concerning the memory area starting at start and extending length bytes. If start and length are omitted, the complete mapping is spanned. On some techniques (including Linux), start should be a a number of of the PAGESIZE. Availability: Methods with the madvise() system call. Copy the rely bytes beginning at offset src to the vacation spot index dest. Read, then calls to maneuver will increase a TypeError exception. Return a bytes containing as much as n bytes beginning from the present file place. If the argument is omitted, None or negative, return all bytes from the present file place to the top of the mapping. The file place is up to date to point after the bytes that were returned.



Changed in model 3.3: Argument may be omitted or Memory Wave None. Returns a single line, starting at the present file place and as much as the subsequent newline. The file place is up to date to level after the bytes that were returned. Resizes the map and the underlying file, if any. COPY, will raise a TypeError exception. Resizing a map created with trackfd set to False, will increase a ValueError exception. On Windows: Resizing the map will increase an OSError if there are different maps towards the identical named file. Resizing an anonymous map (ie towards the pagefile) will silently create a brand new map with the unique knowledge copied over up to the length of the new measurement. Optional arguments start and end are interpreted as in slice notation. Returns -1 on failure. Changed in version 3.5: Writable bytes-like object is now accepted. Set the file’s present position. Finish or 2 (search relative to the file’s finish). Modified in model 3.13: Return the brand new absolute position as a substitute of None. Return whether the file helps searching for, and the return value is always True. Return the length of the file, which could be bigger than the scale of the memory-mapped area. Returns the present position of the file pointer. Write the bytes in bytes into Memory Wave Method at the current position of the file pointer and return the number of bytes written (by no means lower than len(bytes), since if the write fails, a ValueError shall be raised). The file position is up to date to point after the bytes that had been written. Read, then writing to it'll elevate a TypeError exception.



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