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# os.py -- either mac, dos or posix depending on what system we're on.
# This exports:
# - all functions from either posix or mac, e.g., os.unlink, os.stat, etc.
# - os.path is either module posixpath or macpath
# - os.name is either 'posix' or 'mac'
# - os.curdir is a string representing the current directory ('.' or ':')
# - os.pardir is a string representing the parent directory ('..' or '::')
# - os.sep is the (or a most common) pathname separator ('/' or ':')
# Programs that import and use 'os' stand a better chance of being
# portable between different platforms. Of course, they must then
# only use functions that are defined by all platforms (e.g., unlink
# and opendir), and leave all pathname manipulation to os.path
# (e.g., split and join).
# XXX This is incorrect if the import *path fails...
try:
from posix import *
try:
from posix import _exit
except ImportError:
pass
name = 'posix'
curdir = '.'
pardir = '..'
sep = '/'
import posixpath
path = posixpath
del posixpath
except ImportError:
try:
from mac import *
name = 'mac'
curdir = ':'
pardir = '::'
sep = ':'
import macpath
path = macpath
del macpath
except ImportError:
from dos import *
name = 'dos'
curdir = '.' # XXX doesn't always work
pardir = '..' # XXX doesn't always work
sep = '/' # XXX or '\\' ???
import dospath
path = dospath
del dospath
def execl(file, *args):
execv(file, args)
def execle(file, *args):
env = args[-1]
execve(file, args[:-1], env)
def execlp(file, *args):
execvp(file, args)
def execvp(file, args):
if '/' in file:
execv(file, args)
return
ENOENT = 2
if environ.has_key('PATH'):
import string
PATH = string.splitfields(environ['PATH'], ':')
else:
PATH = ['', '/bin', '/usr/bin']
exc, arg = (ENOENT, 'No such file or directory')
for dir in PATH:
fullname = path.join(dir, file)
try:
execv(fullname, args)
except error, (errno, msg):
if errno != ENOENT:
exc, arg = error, (errno, msg)
raise exc, arg
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