Mercurial > cpython-lru_cache-weakref

annotate Lib/popen2.py @ 5817:48b94de85bf3 legacy-trunk

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Extensive changes by AMK.
author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents 67995bc17f62
children 8abb4d8c3134
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1 import os
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2 import sys
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3 import string
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4
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5 MAXFD = 100 # Max number of file descriptors (os.getdtablesize()???)
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6
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7 def _popen2(cmd, capturestderr=0):
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44145eeb6100 pass the command to sh -c
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8 cmd = ['/bin/sh', '-c', cmd]
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9 p2cread, p2cwrite = os.pipe()
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10 c2pread, c2pwrite = os.pipe()
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11 if capturestderr:
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12 errout, errin = os.pipe()
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13 pid = os.fork()
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14 if pid == 0:
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15 # Child
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16 os.close(0)
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17 os.close(1)
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18 if os.dup(p2cread) <> 0:
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19 sys.stderr.write('popen2: bad read dup\n')
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20 if os.dup(c2pwrite) <> 1:
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21 sys.stderr.write('popen2: bad write dup\n')
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22 if capturestderr:
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23 os.close(2)
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24 if os.dup(errin) <> 2: pass
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25 for i in range(3, MAXFD):
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26 try:
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27 os.close(i)
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28 except: pass
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29 try:
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30 os.execv(cmd[0], cmd)
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31 finally:
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32 os._exit(1)
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33 # Shouldn't come here, I guess
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34 os._exit(1)
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35 os.close(p2cread)
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36 tochild = os.fdopen(p2cwrite, 'w')
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37 os.close(c2pwrite)
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38 fromchild = os.fdopen(c2pread, 'r')
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39 if capturestderr:
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40 os.close(errin)
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41 childerr = os.fdopen(errout, 'r')
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42 return fromchild, tochild, childerr
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43 else:
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44 return fromchild, tochild, None
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45
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46 def popen2(cmd):
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47 return _popen2(cmd, 0)[:2]
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48
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49 def popen3(cmd):
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50 return _popen2(cmd, 1)