Staging
v0.5.1
v0.5.1
Revision b6b43e00f8ba7ffd142795d2ed2e340e4a897a95 authored by cvs2svn on 08 August 1996, 19:05:09 UTC, committed by cvs2svn on 08 August 1996, 19:05:09 UTC
1 parent b4ae6a3
popen2.py
import os
import sys
import string
MAXFD = 100 # Max number of file descriptors (os.getdtablesize()???)
def popen2(cmd):
cmd = ['/bin/sh', '-c', cmd]
p2cread, p2cwrite = os.pipe()
c2pread, c2pwrite = os.pipe()
pid = os.fork()
if pid == 0:
# Child
os.close(0)
os.close(1)
if os.dup(p2cread) <> 0:
sys.stderr.write('popen2: bad read dup\n')
if os.dup(c2pwrite) <> 1:
sys.stderr.write('popen2: bad write dup\n')
for i in range(3, MAXFD):
try:
os.close(i)
except:
pass
try:
os.execv(cmd[0], cmd)
finally:
os._exit(1)
# Shouldn't come here, I guess
os._exit(1)
os.close(p2cread)
tochild = os.fdopen(p2cwrite, 'w')
os.close(c2pwrite)
fromchild = os.fdopen(c2pread, 'r')
return fromchild, tochild
Computing file changes ...
