projects / OpenSPARC-T2-SAM / blame
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| 17 | <title>6.9.1 Popen3 and Popen4 Objects </title> | |
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| 54 | ||
| 55 | <H2><A NAME="SECTION008910000000000000000"></A><A NAME="popen3-objects"></A> | |
| 56 | <BR> | |
| 57 | 6.9.1 Popen3 and Popen4 Objects | |
| 58 | </H2> | |
| 59 | ||
| 60 | <P> | |
| 61 | Instances of the <tt class="class">Popen3</tt> and <tt class="class">Popen4</tt> classes have the | |
| 62 | following methods: | |
| 63 | ||
| 64 | <P> | |
| 65 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 66 | <td><nobr><b><tt id='l2h-1849' xml:id='l2h-1849' class="method">poll</tt></b>(</nobr></td> | |
| 67 | <td><var></var>)</td></tr></table></dt> | |
| 68 | <dd> | |
| 69 | Returns <code>-1</code> if child process hasn't completed yet, or its return | |
| 70 | code otherwise. | |
| 71 | </dl> | |
| 72 | ||
| 73 | <P> | |
| 74 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 75 | <td><nobr><b><tt id='l2h-1850' xml:id='l2h-1850' class="method">wait</tt></b>(</nobr></td> | |
| 76 | <td><var></var>)</td></tr></table></dt> | |
| 77 | <dd> | |
| 78 | Waits for and returns the status code of the child process. The | |
| 79 | status code encodes both the return code of the process and | |
| 80 | information about whether it exited using the <tt class="cfunction">exit()</tt> | |
| 81 | system call or died due to a signal. Functions to help interpret the | |
| 82 | status code are defined in the <tt class="module"><a href="module-os.html">os</a></tt> module; see section | |
| 83 | <A href="os-process.html#os-process">6.1.5</A> for the <tt class="function">W<var>*</var>()</tt> family of functions. | |
| 84 | </dl> | |
| 85 | ||
| 86 | <P> | |
| 87 | The following attributes are also available: | |
| 88 | ||
| 89 | <P> | |
| 90 | <dl><dt><b><tt id='l2h-1851' xml:id='l2h-1851' class="member">fromchild</tt></b></dt> | |
| 91 | <dd> | |
| 92 | A file object that provides output from the child process. For | |
| 93 | <tt class="class">Popen4</tt> instances, this will provide both the standard output | |
| 94 | and standard error streams. | |
| 95 | </dl> | |
| 96 | ||
| 97 | <P> | |
| 98 | <dl><dt><b><tt id='l2h-1852' xml:id='l2h-1852' class="member">tochild</tt></b></dt> | |
| 99 | <dd> | |
| 100 | A file object that provides input to the child process. | |
| 101 | </dl> | |
| 102 | ||
| 103 | <P> | |
| 104 | <dl><dt><b><tt id='l2h-1853' xml:id='l2h-1853' class="member">childerr</tt></b></dt> | |
| 105 | <dd> | |
| 106 | A file object that provides error output from the child process, if | |
| 107 | <var>capturestderr</var> was true for the constructor, otherwise | |
| 108 | <code>None</code>. This will always be <code>None</code> for <tt class="class">Popen4</tt> | |
| 109 | instances. | |
| 110 | </dl> | |
| 111 | ||
| 112 | <P> | |
| 113 | <dl><dt><b><tt id='l2h-1854' xml:id='l2h-1854' class="member">pid</tt></b></dt> | |
| 114 | <dd> | |
| 115 | The process ID of the child process. | |
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| 154 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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