mirror of
https://github.com/python/cpython
synced 2024-09-21 10:47:07 +00:00
54f22ed30b
who writes: Here is batch 2, as a big collection of CVS context diffs. Along with moving comments into docstrings, i've added a couple of missing docstrings and attempted to make sure more module docstrings begin with a one-line summary. I did not add docstrings to the methods in profile.py for fear of upsetting any careful optimizations there, though i did move class documentation into class docstrings. The convention i'm using is to leave credits/version/copyright type of stuff in # comments, and move the rest of the descriptive stuff about module usage into module docstrings. Hope this is okay.
233 lines
7.5 KiB
Python
233 lines
7.5 KiB
Python
"""Extended file operations available in POSIX.
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f = posixfile.open(filename, [mode, [bufsize]])
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will create a new posixfile object
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f = posixfile.fileopen(fileobject)
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will create a posixfile object from a builtin file object
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f.file()
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will return the original builtin file object
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f.dup()
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will return a new file object based on a new filedescriptor
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f.dup2(fd)
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will return a new file object based on the given filedescriptor
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f.flags(mode)
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will turn on the associated flag (merge)
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mode can contain the following characters:
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(character representing a flag)
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a append only flag
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c close on exec flag
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n no delay flag
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s synchronization flag
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(modifiers)
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! turn flags 'off' instead of default 'on'
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= copy flags 'as is' instead of default 'merge'
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? return a string in which the characters represent the flags
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that are set
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note: - the '!' and '=' modifiers are mutually exclusive.
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- the '?' modifier will return the status of the flags after they
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have been changed by other characters in the mode string
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f.lock(mode [, len [, start [, whence]]])
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will (un)lock a region
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mode can contain the following characters:
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(character representing type of lock)
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u unlock
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r read lock
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w write lock
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(modifiers)
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| wait until the lock can be granted
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? return the first lock conflicting with the requested lock
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or 'None' if there is no conflict. The lock returned is in the
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format (mode, len, start, whence, pid) where mode is a
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character representing the type of lock ('r' or 'w')
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note: - the '?' modifier prevents a region from being locked; it is
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query only
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"""
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class _posixfile_:
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"""File wrapper class that provides extra POSIX file routines."""
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states = ['open', 'closed']
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#
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# Internal routines
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#
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def __repr__(self):
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file = self._file_
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return "<%s posixfile '%s', mode '%s' at %s>" % \
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(self.states[file.closed], file.name, file.mode, \
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hex(id(self))[2:])
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def __del__(self):
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self._file_.close()
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#
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# Initialization routines
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#
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def open(self, name, mode='r', bufsize=-1):
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import __builtin__
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return self.fileopen(__builtin__.open(name, mode, bufsize))
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def fileopen(self, file):
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if `type(file)` != "<type 'file'>":
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raise TypeError, 'posixfile.fileopen() arg must be file object'
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self._file_ = file
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# Copy basic file methods
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for method in file.__methods__:
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setattr(self, method, getattr(file, method))
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return self
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#
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# New methods
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#
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def file(self):
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return self._file_
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def dup(self):
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import posix
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try: ignore = posix.fdopen
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except: raise AttributeError, 'dup() method unavailable'
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return posix.fdopen(posix.dup(self._file_.fileno()), self._file_.mode)
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def dup2(self, fd):
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import posix
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try: ignore = posix.fdopen
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except: raise AttributeError, 'dup() method unavailable'
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posix.dup2(self._file_.fileno(), fd)
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return posix.fdopen(fd, self._file_.mode)
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def flags(self, *which):
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import fcntl, FCNTL
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if which:
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if len(which) > 1:
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raise TypeError, 'Too many arguments'
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which = which[0]
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else: which = '?'
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l_flags = 0
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if 'n' in which: l_flags = l_flags | FCNTL.O_NDELAY
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if 'a' in which: l_flags = l_flags | FCNTL.O_APPEND
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if 's' in which: l_flags = l_flags | FCNTL.O_SYNC
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file = self._file_
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if '=' not in which:
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cur_fl = fcntl.fcntl(file.fileno(), FCNTL.F_GETFL, 0)
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if '!' in which: l_flags = cur_fl & ~ l_flags
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else: l_flags = cur_fl | l_flags
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l_flags = fcntl.fcntl(file.fileno(), FCNTL.F_SETFL, l_flags)
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if 'c' in which:
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arg = ('!' not in which) # 0 is don't, 1 is do close on exec
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l_flags = fcntl.fcntl(file.fileno(), FCNTL.F_SETFD, arg)
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if '?' in which:
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which = '' # Return current flags
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l_flags = fcntl.fcntl(file.fileno(), FCNTL.F_GETFL, 0)
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if FCNTL.O_APPEND & l_flags: which = which + 'a'
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if fcntl.fcntl(file.fileno(), FCNTL.F_GETFD, 0) & 1:
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which = which + 'c'
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if FCNTL.O_NDELAY & l_flags: which = which + 'n'
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if FCNTL.O_SYNC & l_flags: which = which + 's'
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return which
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def lock(self, how, *args):
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import struct, fcntl, FCNTL
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if 'w' in how: l_type = FCNTL.F_WRLCK
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elif 'r' in how: l_type = FCNTL.F_RDLCK
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elif 'u' in how: l_type = FCNTL.F_UNLCK
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else: raise TypeError, 'no type of lock specified'
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if '|' in how: cmd = FCNTL.F_SETLKW
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elif '?' in how: cmd = FCNTL.F_GETLK
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else: cmd = FCNTL.F_SETLK
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l_whence = 0
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l_start = 0
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l_len = 0
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if len(args) == 1:
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l_len = args[0]
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elif len(args) == 2:
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l_len, l_start = args
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elif len(args) == 3:
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l_len, l_start, l_whence = args
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elif len(args) > 3:
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raise TypeError, 'too many arguments'
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# Hack by davem@magnet.com to get locking to go on freebsd;
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# additions for AIX by Vladimir.Marangozov@imag.fr
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import sys, os
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if sys.platform in ('netbsd1',
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'openbsd2',
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'freebsd2', 'freebsd3',
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'bsdos2', 'bsdos3', 'bsdos4'):
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flock = struct.pack('lxxxxlxxxxlhh', \
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l_start, l_len, os.getpid(), l_type, l_whence)
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elif sys.platform in ['aix3', 'aix4']:
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flock = struct.pack('hhlllii', \
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l_type, l_whence, l_start, l_len, 0, 0, 0)
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else:
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flock = struct.pack('hhllhh', \
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l_type, l_whence, l_start, l_len, 0, 0)
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flock = fcntl.fcntl(self._file_.fileno(), cmd, flock)
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if '?' in how:
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if sys.platform in ('netbsd1',
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'openbsd2',
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'freebsd2', 'freebsd3',
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'bsdos2', 'bsdos3', 'bsdos4'):
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l_start, l_len, l_pid, l_type, l_whence = \
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struct.unpack('lxxxxlxxxxlhh', flock)
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elif sys.platform in ['aix3', 'aix4']:
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l_type, l_whence, l_start, l_len, l_sysid, l_pid, l_vfs = \
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struct.unpack('hhlllii', flock)
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elif sys.platform == "linux2":
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l_type, l_whence, l_start, l_len, l_pid, l_sysid = \
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struct.unpack('hhllhh', flock)
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else:
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l_type, l_whence, l_start, l_len, l_sysid, l_pid = \
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struct.unpack('hhllhh', flock)
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if l_type != FCNTL.F_UNLCK:
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if l_type == FCNTL.F_RDLCK:
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return 'r', l_len, l_start, l_whence, l_pid
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else:
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return 'w', l_len, l_start, l_whence, l_pid
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def open(name, mode='r', bufsize=-1):
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"""Public routine to open a file as a posixfile object."""
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return _posixfile_().open(name, mode, bufsize)
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def fileopen(file):
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"""Public routine to get a posixfile object from a Python file object."""
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return _posixfile_().fileopen(file)
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#
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# Constants
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#
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SEEK_SET = 0
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SEEK_CUR = 1
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SEEK_END = 2
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#
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# End of posixfile.py
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#
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