Mmap - Memory-mapped File Support¶ > 자유게시판

Maps length bytes from the file specified by the file descriptor fileno, and returns a mmap object. If length is 0, the utmost length of the map can be the current size of the file when mmap is called. 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 learn or written. It's an error to specify both flags, prot and entry. See the description of entry above for information on how to make use of 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 won't be duplicated, and the ensuing mmap object is not going to be related to the map’s underlying file. Which means the scale() and resize() methods will fail. This mode is beneficial to restrict the variety 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 retailer on macOS. Changed in version 3.13: The trackfd parameter was added. Added in model 3.2: Context manager support. Closes the mmap. Subsequent calls to different methods of the article will end in a ValueError exception being raised. This will not shut the open file. True if the file is closed. Non-compulsory arguments begin and finish are interpreted as in slice notation. Returns -1 on failure. Changed in model 3.5: Memory Wave Writable bytes-like object is now accepted. Flushes changes made to the in-Memory Wave Protocol copy of a file again to disk. Without use of this call there is no assure that adjustments are written back before the article is destroyed. If offset and measurement are specified, only modifications to the given range 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 decision failed. Modified in model 3.8: Previously, a nonzero worth was returned on success; zero was returned on error underneath Windows. A zero value was returned on success; an exception was raised on error below Unix. Send advice option to the kernel about the memory region starting at start and extending length bytes. If start and length are omitted, your entire mapping is spanned. On some systems (including Linux), start should be a multiple of the PAGESIZE. Availability: Techniques with the madvise() system call. Copy the depend bytes beginning at offset src to the vacation spot index dest. Read, then calls to maneuver will raise a TypeError exception. Return a bytes containing up to n bytes beginning from the current file place. 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 up to date to point after the bytes that were returned.

Modified in model 3.3: Argument may be omitted or None. Returns a single line, starting at the current file place and as much as the subsequent newline. The file place is updated to level after the bytes that have been returned. Resizes the map and the underlying file, if any. COPY, will increase a TypeError exception. Resizing a map created with trackfd set to False, will increase a ValueError exception. On Home windows: Resizing the map will elevate an OSError if there are other maps towards the identical named file. Resizing an anonymous map (ie in opposition to the pagefile) will silently create a new map with the original knowledge copied over up to the size of the new dimension. Elective arguments start and end 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 present position. End or 2 (seek relative to the file’s end). Modified in version 3.13: Return the brand new absolute position as a substitute of None. Return whether or not the file helps searching for, and the return worth is at all times True. Return the length of the file, which may be larger than the scale of the memory-mapped space. Returns the present place of the file pointer. Write the bytes in bytes into memory at the current position of the file pointer and return the number of bytes written (never lower than len(bytes), since if the write fails, a ValueError might be raised). The file position is updated to point after the bytes that have been written. Learn, then writing to it should increase a TypeError exception.

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