posixfile¶
Extended file operations available in POSIX.
- f = posixfile.open(filename, [mode, [bufsize]])
- will create a new posixfile object
- f = posixfile.fileopen(fileobject)
- will create a posixfile object from a builtin file object
- f.file()
- will return the original builtin file object
- f.dup()
- will return a new file object based on a new filedescriptor
- f.dup2(fd)
- will return a new file object based on the given filedescriptor
- f.flags(mode)
- will turn on the associated flag (merge) mode can contain the following characters:
- (character representing a flag)
- a append only flag c close on exec flag n no delay flag s synchronization flag
- (modifiers)
! turn flags ‘off’ instead of default ‘on’ = copy flags ‘as is’ instead of default ‘merge’ ? return a string in which the characters represent the flags
that are set- note: - the ‘!’ and ‘=’ modifiers are mutually exclusive.
- the ‘?’ modifier will return the status of the flags after they have been changed by other characters in the mode string
- f.lock(mode [, len [, start [, whence]]])
- will (un)lock a region mode can contain the following characters:
- (character representing type of lock)
- u unlock r read lock w write lock
- (modifiers)
- wait until the lock can be granted
- ? return the first lock conflicting with the requested lock
- or ‘None’ if there is no conflict. The lock returned is in the format (mode, len, start, whence, pid) where mode is a character representing the type of lock (‘r’ or ‘w’)
- note: - the ‘?’ modifier prevents a region from being locked; it is
- query only