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#/*##########################################################################
# Copyright (C) 2001-2013 European Synchrotron Radiation Facility
#
# PyHST2
# European Synchrotron Radiation Facility, Grenoble,France
#
# PyHST2 is developed at
# the ESRF by the Scientific Software staff.
# Principal author for PyHST2: Alessandro Mirone.
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the Free
# Software Foundation; either version 2 of the License, or (at your option)
# any later version.
#
# PyHST2 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
# PyHST2; if not, write to the Free Software Foundation, Inc., 59 Temple Place,
# Suite 330, Boston, MA 02111-1307, USA.
#
# PyHST2 follows the dual licensing model of Trolltech's Qt and Riverbank's PyQt
# and cannot be used as a free plugin for a non-free program.
#
# Please contact the ESRF industrial unit (industry@esrf.fr) if this license
# is a problem for you.
#############################################################################*/
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import string
import sys
import os
import select
HUGE = 10000
def getSysOutput(command):
rd, wr = os.pipe() # Create the pipe
pid = os.fork() # Create a new process
if pid: # Parent code
print( "MYPID ", pid)
os.close(wr) # The parent won't write the pipe
fdlist=[rd]
msgtot=""
while fdlist != []:
(readable, writeable, oob) = select.select(fdlist, [], [])
# writeable and oob will always be '[]' here, since we're
# not waiting for them
for f in readable:
msg=os.read(f, HUGE)
if msg != '':
if msg[-1:] == '\n': # This is always the case
msg = msg[:-1] # Strip the newline
msgtot=msgtot+msg
else: # Read zero bytes => child terminated
os.close(f)
fdlist=[]
break
else:
os.close(rd) # The child won't read the pipe
# Make sure the child won't read input intended for the parent:
null = open('/dev/null')
os.dup2(null.fileno(), sys.stdin.fileno())
null.close()
os.dup2(wr, sys.stdout.fileno())
os.system(command )
os.close(wr)
sys.exit(0) # Terminate the child process
return msgtot
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