Mmap - Memory-mapped File Support¶

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Maps length 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 be the present dimension of the file when mmap is named. SHARED creates a mapping that’s shared with all other processes mapping the identical areas of the file. WRITE, to specify that the pages could also be learn or written. It's an error to specify each flags, prot and entry. See the outline of entry above for data on how to use this parameter. 0. offset must be a a number of of ALLOCATIONGRANULARITY which is equal to PAGESIZE on Unix methods. If trackfd is False, the file descriptor specified by fileno is not going to be duplicated, and the ensuing mmap object will not be related to the map’s underlying file. Which means that the dimensions() 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 robotically synchronized with the bodily backing store on macOS. Changed in version 3.13: The trackfd parameter was added. Added in model 3.2: Context supervisor assist. Closes the mmap. Subsequent calls to other strategies of the item will lead to a ValueError Memory Wave System exception being raised. This will not shut the open file. True if the file is closed. Non-obligatory arguments start and finish are interpreted as in slice notation. Returns -1 on failure. Changed in version 3.5: Writable bytes-like object is now accepted. Flushes modifications made to the in-Memory Wave System copy of a file back to disk. With out use of this name there is no such thing as a assure that modifications are written back earlier than the article is destroyed. If offset and dimension are specified, solely changes to the given range of bytes shall be flushed to disk; in any other case, the whole extent of the mapping is flushed.



None is returned to point success. An exception is raised when the decision failed. Changed in model 3.8: Previously, a nonzero value was returned on success; zero was returned on error beneath Windows. A zero worth was returned on success; an exception was raised on error under Unix. Ship advice option to the kernel concerning the memory region starting at start and extending length bytes. If start and size are omitted, your entire mapping is spanned. On some systems (including Linux), start should be a a number of of the PAGESIZE. Availability: Systems with the madvise() system name. Copy the depend bytes starting at offset src to the vacation spot index dest. Read, then calls to move will raise a TypeError exception. Return a bytes containing up to n bytes beginning from the present file position. If the argument is omitted, None or damaging, return all bytes from the current file place to the end of the mapping. The file place is updated to point after the bytes that have been returned.



Changed in model 3.3: Argument can be omitted or None. Returns a single line, starting at the present file place and up to the subsequent newline. The file position is up to date to point after the bytes that had been 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 elevate a ValueError exception. On Home windows: Resizing the map will increase an OSError if there are other maps towards the same named file. Resizing an nameless map (ie in opposition to the pagefile) will silently create a new map with the original information copied over as much as the length of the brand new size. Optional arguments start and finish are interpreted as in slice notation. Returns -1 on failure. Modified in version 3.5: Writable bytes-like object is now accepted. Set the file’s current place. End or 2 (search relative to the file’s finish). Modified in model 3.13: Return the brand new absolute place instead of None. Return whether or not the file supports seeking, and the return value is all the time True. Return the length of the file, which could be larger than the size of the Memory Wave-mapped area. Returns the present place of the file pointer. Write the bytes in bytes into Memory Wave at the present place of the file pointer and return the variety of bytes written (never less than len(bytes), since if the write fails, a ValueError will be raised). The file place is up to date to point after the bytes that have been written. Read, then writing to it'll elevate a TypeError exception.



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