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Initial commit of OpenSPARC T2 design and verification files.
[OpenSPARC-T2-DV] / tools / src / nas,5.n2.os.2 / lib / python / html / python / lib / node246.html
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53
54<H3><A NAME="SECTION008836000000000000000">
556.8.3.6 Replacing popen2.*</A>
56</H3>
57
58<P>
59<span class="note"><b class="label">Note:</b>
60If the cmd argument to popen2 functions is a string, the command
61is executed through /bin/sh. If it is a list, the command is directly
62executed.</span>
63
64<P>
65<div class="verbatim"><pre>
66(child_stdout, child_stdin) = popen2.popen2("somestring", bufsize, mode)
67==&gt;
68p = Popen(["somestring"], shell=True, bufsize=bufsize,
69 stdin=PIPE, stdout=PIPE, close_fds=True)
70(child_stdout, child_stdin) = (p.stdout, p.stdin)
71</pre></div>
72
73<P>
74<div class="verbatim"><pre>
75(child_stdout, child_stdin) = popen2.popen2(["mycmd", "myarg"], bufsize, mode)
76==&gt;
77p = Popen(["mycmd", "myarg"], bufsize=bufsize,
78 stdin=PIPE, stdout=PIPE, close_fds=True)
79(child_stdout, child_stdin) = (p.stdout, p.stdin)
80</pre></div>
81
82<P>
83The popen2.Popen3 and popen3.Popen4 basically works as subprocess.Popen,
84except that:
85
86<P>
87
88<UL>
89<LI>subprocess.Popen raises an exception if the execution fails
90
91<P>
92</LI>
93<LI>the <var>capturestderr</var> argument is replaced with the <var>stderr</var>
94 argument.
95
96<P>
97</LI>
98<LI>stdin=PIPE and stdout=PIPE must be specified.
99
100<P>
101</LI>
102<LI>popen2 closes all file descriptors by default, but you have to
103 specify close_fds=True with subprocess.Popen.
104</LI>
105</UL>
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141<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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Full OpenSPARC design & verification tarball including full HDL.