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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 """ import warnings warnings.warn("The posixfile module is deprecated; " "fcntl.lockf() provides better locking", DeprecationWarning, 2) class _posixfile_: """File wrapper class that provides extra POSIX file routines.""" states = ['open', 'closed'] # # Internal routines # def __repr__(self): file = self._file_ return "<%s posixfile '%s', mode '%s' at %s>" % \ (self.states[file.closed], file.name, file.mode, \ hex(id(self))[2:]) # # Initialization routines # def open(self, name, mode='r', bufsize=-1): import __builtin__ return self.fileopen(__builtin__.open(name, mode, bufsize)) def fileopen(self, file): import types if repr(type(file)) != "": raise TypeError, 'posixfile.fileopen() arg must be file object' self._file_ = file # Copy basic file methods for maybemethod in dir(file): if not maybemethod.startswith('_'): attr = getattr(file, maybemethod) if isinstance(attr, types.BuiltinMethodType): setattr(self, maybemethod, attr) return self # # New methods # def file(self): return self._file_ def dup(self): import posix if not hasattr(posix, 'fdopen'): raise AttributeError, 'dup() method unavailable' return posix.fdopen(posix.dup(self._file_.fileno()), self._file_.mode) def dup2(self, fd): import posix if not hasattr(posix, 'fdopen'): raise AttributeError, 'dup() method unavailable' posix.dup2(self._file_.fileno(), fd) return posix.fdopen(fd, self._file_.mode) def flags(self, *which): import fcntl, os if which: if len(which) > 1: raise TypeError, 'Too many arguments' which = which[0] else: which = '?' l_flags = 0 if 'n' in which: l_flags = l_flags | os.O_NDELAY if 'a' in which: l_flags = l_flags | os.O_APPEND if 's' in which: l_flags = l_flags | os.O_SYNC file = self._file_ if '=' not in which: cur_fl = fcntl.fcntl(file.fileno(), fcntl.F_GETFL, 0) if '!' in which: l_flags = cur_fl & ~ l_flags else: l_flags = cur_fl | l_flags l_flags = fcntl.fcntl(file.fileno(), fcntl.F_SETFL, l_flags) if 'c' in which: arg = ('!' not in which) # 0 is don't, 1 is do close on exec l_flags = fcntl.fcntl(file.fileno(), fcntl.F_SETFD, arg) if '?' in which: which = '' # Return current flags l_flags = fcntl.fcntl(file.fileno(), fcntl.F_GETFL, 0) if os.O_APPEND & l_flags: which = which + 'a' if fcntl.fcntl(file.fileno(), fcntl.F_GETFD, 0) & 1: which = which + 'c' if os.O_NDELAY & l_flags: which = which + 'n' if os.O_SYNC & l_flags: which = which + 's' return which def lock(self, how, *args): import struct, fcntl if 'w' in how: l_type = fcntl.F_WRLCK elif 'r' in how: l_type = fcntl.F_RDLCK elif 'u' in how: l_type = fcntl.F_UNLCK else: raise TypeError, 'no type of lock specified' if '|' in how: cmd = fcntl.F_SETLKW elif '?' in how: cmd = fcntl.F_GETLK else: cmd = fcntl.F_SETLK l_whence = 0 l_start = 0 l_len = 0 if len(args) == 1: l_len = args[0] elif len(args) == 2: l_len, l_start = args elif len(args) == 3: l_len, l_start, l_whence = args elif len(args) > 3: raise TypeError, 'too many arguments' # Hack by davem@magnet.com to get locking to go on freebsd; # additions for AIX by Vladimir.Marangozov@imag.fr import sys, os if sys.platform in ('netbsd1', 'openbsd2', 'freebsd2', 'freebsd3', 'freebsd4', 'freebsd5', 'freebsd6', 'freebsd7', 'freebsd8', 'bsdos2', 'bsdos3', 'bsdos4'): flock = struct.pack('lxxxxlxxxxlhh', \ l_start, l_len, os.getpid(), l_type, l_whence) elif sys.platform in ('aix3', 'aix4'): flock = struct.pack('hhlllii', \ l_type, l_whence, l_start, l_len, 0, 0, 0) else: flock = struct.pack('hhllhh', \ l_type, l_whence, l_start, l_len, 0, 0) flock = fcntl.fcntl(self._file_.fileno(), cmd, flock) if '?' in how: if sys.platform in ('netbsd1', 'openbsd2', 'freebsd2', 'freebsd3', 'freebsd4', 'freebsd5', 'bsdos2', 'bsdos3', 'bsdos4'): l_start, l_len, l_pid, l_type, l_whence = \ struct.unpack('lxxxxlxxxxlhh', flock) elif sys.platform in ('aix3', 'aix4'): l_type, l_whence, l_start, l_len, l_sysid, l_pid, l_vfs = \ struct.unpack('hhlllii', flock) elif sys.platform == "linux2": l_type, l_whence, l_start, l_len, l_pid, l_sysid = \ struct.unpack('hhllhh', flock) else: l_type, l_whence, l_start, l_len, l_sysid, l_pid = \ struct.unpack('hhllhh', flock) if l_type != fcntl.F_UNLCK: if l_type == fcntl.F_RDLCK: return 'r', l_len, l_start, l_whence, l_pid else: return 'w', l_len, l_start, l_whence, l_pid def open(name, mode='r', bufsize=-1): """Public routine to open a file as a posixfile object.""" return _posixfile_().open(name, mode, bufsize) def fileopen(file): """Public routine to get a posixfile object from a Python file object.""" return _posixfile_().fileopen(file) # # Constants # SEEK_SET = 0 SEEK_CUR = 1 SEEK_END = 2 # # End of posixfile.py #