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50 lines
1.1 KiB
Python
50 lines
1.1 KiB
Python
import os
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import sys
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import string
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MAXFD = 100 # Max number of file descriptors (os.getdtablesize()???)
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def _popen2(cmd, capturestderr=0):
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cmd = ['/bin/sh', '-c', cmd]
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p2cread, p2cwrite = os.pipe()
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c2pread, c2pwrite = os.pipe()
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if capturestderr:
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errout, errin = os.pipe()
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pid = os.fork()
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if pid == 0:
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# Child
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os.close(0)
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os.close(1)
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if os.dup(p2cread) <> 0:
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sys.stderr.write('popen2: bad read dup\n')
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if os.dup(c2pwrite) <> 1:
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sys.stderr.write('popen2: bad write dup\n')
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if capturestderr:
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os.close(2)
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if os.dup(errin) <> 2: pass
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for i in range(3, MAXFD):
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try:
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os.close(i)
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except: pass
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try:
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os.execv(cmd[0], cmd)
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finally:
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os._exit(1)
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# Shouldn't come here, I guess
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os._exit(1)
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os.close(p2cread)
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tochild = os.fdopen(p2cwrite, 'w')
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os.close(c2pwrite)
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fromchild = os.fdopen(c2pread, 'r')
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if capturestderr:
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os.close(errin)
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childerr = os.fdopen(errout, 'r')
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return fromchild, tochild, childerr
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else:
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return fromchild, tochild, None
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def popen2(cmd):
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return _popen2(cmd, 0)[:2]
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def popen3(cmd):
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return _popen2(cmd, 1)
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