projects / OpenSPARC-T2-SAM / blame
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| 17 | <title>6.8.2 Popen Objects</title> | |
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| 54 | ||
| 55 | <H2><A NAME="SECTION008820000000000000000"> | |
| 56 | 6.8.2 Popen Objects</A> | |
| 57 | </H2> | |
| 58 | ||
| 59 | <P> | |
| 60 | Instances of the <tt class="class">Popen</tt> class have the following methods: | |
| 61 | ||
| 62 | <P> | |
| 63 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 64 | <td><nobr><b><tt id='l2h-1835' xml:id='l2h-1835' class="method">poll</tt></b>(</nobr></td> | |
| 65 | <td><var></var>)</td></tr></table></dt> | |
| 66 | <dd> | |
| 67 | Check if child process has terminated. Returns returncode | |
| 68 | attribute. | |
| 69 | </dl> | |
| 70 | ||
| 71 | <P> | |
| 72 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 73 | <td><nobr><b><tt id='l2h-1836' xml:id='l2h-1836' class="method">wait</tt></b>(</nobr></td> | |
| 74 | <td><var></var>)</td></tr></table></dt> | |
| 75 | <dd> | |
| 76 | Wait for child process to terminate. Returns returncode attribute. | |
| 77 | </dl> | |
| 78 | ||
| 79 | <P> | |
| 80 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 81 | <td><nobr><b><tt id='l2h-1837' xml:id='l2h-1837' class="method">communicate</tt></b>(</nobr></td> | |
| 82 | <td><var>input=None</var>)</td></tr></table></dt> | |
| 83 | <dd> | |
| 84 | Interact with process: Send data to stdin. Read data from stdout and | |
| 85 | stderr, until end-of-file is reached. Wait for process to terminate. | |
| 86 | The optional <var>input</var> argument should be a string to be sent to the | |
| 87 | child process, or <code>None</code>, if no data should be sent to the child. | |
| 88 | ||
| 89 | <P> | |
| 90 | communicate() returns a tuple (stdout, stderr). | |
| 91 | ||
| 92 | <P> | |
| 93 | <span class="note"><b class="label">Note:</b> | |
| 94 | The data read is buffered in memory, so do not use this method | |
| 95 | if the data size is large or unlimited.</span> | |
| 96 | </dl> | |
| 97 | ||
| 98 | <P> | |
| 99 | The following attributes are also available: | |
| 100 | ||
| 101 | <P> | |
| 102 | <dl><dt><b><tt id='l2h-1838' xml:id='l2h-1838' class="member">stdin</tt></b></dt> | |
| 103 | <dd> | |
| 104 | If the <var>stdin</var> argument is <code>PIPE</code>, this attribute is a file | |
| 105 | object that provides input to the child process. Otherwise, it is | |
| 106 | <code>None</code>. | |
| 107 | </dl> | |
| 108 | ||
| 109 | <P> | |
| 110 | <dl><dt><b><tt id='l2h-1839' xml:id='l2h-1839' class="member">stdout</tt></b></dt> | |
| 111 | <dd> | |
| 112 | If the <var>stdout</var> argument is <code>PIPE</code>, this attribute is a file | |
| 113 | object that provides output from the child process. Otherwise, it is | |
| 114 | <code>None</code>. | |
| 115 | </dl> | |
| 116 | ||
| 117 | <P> | |
| 118 | <dl><dt><b><tt id='l2h-1840' xml:id='l2h-1840' class="member">stderr</tt></b></dt> | |
| 119 | <dd> | |
| 120 | If the <var>stderr</var> argument is <code>PIPE</code>, this attribute is file | |
| 121 | object that provides error output from the child process. Otherwise, | |
| 122 | it is <code>None</code>. | |
| 123 | </dl> | |
| 124 | ||
| 125 | <P> | |
| 126 | <dl><dt><b><tt id='l2h-1841' xml:id='l2h-1841' class="member">pid</tt></b></dt> | |
| 127 | <dd> | |
| 128 | The process ID of the child process. | |
| 129 | </dl> | |
| 130 | ||
| 131 | <P> | |
| 132 | <dl><dt><b><tt id='l2h-1842' xml:id='l2h-1842' class="member">returncode</tt></b></dt> | |
| 133 | <dd> | |
| 134 | The child return code. A <code>None</code> value indicates that the process | |
| 135 | hasn't terminated yet. A negative value -N indicates that the child | |
| 136 | was terminated by signal N (<span class="Unix">Unix</span> only). | |
| 137 | </dl> | |
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