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# Copyright (c) 2005-2007 Forest Bond.
# This file is part of the sclapp software package.
#
# sclapp 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.
#
# A copy of the license has been included in the COPYING file.
import sys, os, types
from sclapp import error_output
def _dup(n, f, flags = None):
os.close(n)
try:
return os.dup(f.fileno())
except (AttributeError, TypeError):
try:
return os.dup(f)
except TypeError:
try:
return os.open(f, flags)
except TypeError:
raise TypeError, (
'f is neither a usable file-like object, '
'an integer file descriptor, nor a filename.'
)
def redirectFds(stdin = None, stdout = None, stderr = None):
'''Redirects the standard I/O file descriptors for the current process.
stdin, stdout, and stderr can be either a filename, an fd (integer), or
None (to indicate no redirection).
'''
pid = os.getpid()
if stdin is not None:
error_output._printSclappDebug(
u'pid %u: redirecting stdin to %s' % (pid, stdin))
_dup(0, stdin, os.O_RDONLY)
if stdout is not None:
error_output._printSclappDebug(
u'pid %u: redirecting stdout to %s' % (pid, stdout))
_dup(1, stdout, os.O_RDWR | os.O_APPEND | os.O_CREAT)
if stderr is not None:
error_output._printSclappDebug(
u'pid %u: redirecting stderr to %s' % (pid, stderr))
_dup(2, stderr, os.O_RDWR | os.O_APPEND | os.O_CREAT)
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