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# This is part of UMView
# The user-mode implementation of View-OS: A Process with a View
#
# Sample Python module that mimics the unreal testmodule
#
# Copyright 2008 Ludovico Gardenghi, University of Bologna, Italy
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License, version 2, as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
import os
import umpyew
def modInit():
global t1, t2
t1 = umpyew.tstTimestamp()
t2 = umpyew.tstTimestamp()
def modCheckFun(*arg, **kw):
if kw.has_key('path') and kw['path'][0:7] == '/unreal':
e = umpyew.tstMatchingEpoch(t2)
if e == 0:
return umpyew.tstMatchingEpoch(t1)
return e
return 0
def unwrap(path):
if type(path) == str:
return path[0] + path[8:]
else:
return path
############################
# System calls definitions #
############################
# These functions can be safely mapped to the corresponding real syscalls.
sysRead = sysWrite = sysClose = sysFstat64 = sysLseek = None
def sysGenericPath(path, *arg, **kw):
try:
rv = getattr(os, kw['cname'])(unwrap(path), *arg)
if rv == None:
return (0, 0)
elif type(rv) == bool:
# syscalls like os.access() return True or False. Since True means
# success, and for UNIX syscalls succes is 0, we must negate the
# value (True is represented as 1 and False as 0).
return (not rv, 0)
else:
return (rv, 0)
except OSError, (errno, strerror):
return (-1, errno)
sysOpen = sysRmdir = sysUnlink = sysAccess = sysMkdir = sysChmod = sysUtime = sysUtimes = sysGenericPath
# Manages also symlink()
def sysLink(oldpath, newpath, **kw):
try:
if kw['cname'] == 'symlink':
os.symlink(oldpath, unwrap(newpath))
else: # link
os.link(unwrap(oldpath), unwrap(newpath))
return (0, 0)
except OSError, (errno, strerror):
return (-1, errno)
sysSymlink = sysLink
# manages stat64, lstat64()
def sysStats(path, **kw):
try:
os.stat_float_times(False)
return (0, 0, getattr(os, kw['cname'].rstrip('64'))(unwrap(path)))
except OSError, (errno, strerror):
return (-1, errno)
sysStat64 = sysLstat64 = sysStats
def sysStatfs64(**kw):
try:
return (0, 0, os.statvfs(unwrap(path)))
except OSError, (errno, strerror):
return (-1, errno)
def sysReadlink(path, bufsiz, **kw):
try:
tmplink = os.readlink(unwrap(path))
return (min(bufsiz, len(tmplink)), 0, tmplink[0:bufsiz])
except OSError, (errno, strerror):
return (-1, errno)
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