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| 54 | ||
| 55 | <H1><A NAME="SECTION00101000000000000000000"> | |
| 56 | 8.10 <tt class="module">pty</tt> -- | |
| 57 | Pseudo-terminal utilities</A> | |
| 58 | </H1> | |
| 59 | <A NAME="module-pty"></A> | |
| 60 | <p class="availability">Availability: <span | |
| 61 | class="platform">IRIX, Linux</span>.</p> | |
| 62 | ||
| 63 | <P> | |
| 64 | The <tt class="module">pty</tt> module defines operations for handling the | |
| 65 | pseudo-terminal concept: starting another process and being able to | |
| 66 | write to and read from its controlling terminal programmatically. | |
| 67 | ||
| 68 | <P> | |
| 69 | Because pseudo-terminal handling is highly platform dependant, there | |
| 70 | is code to do it only for SGI and Linux. (The Linux code is supposed | |
| 71 | to work on other platforms, but hasn't been tested yet.) | |
| 72 | ||
| 73 | <P> | |
| 74 | The <tt class="module">pty</tt> module defines the following functions: | |
| 75 | ||
| 76 | <P> | |
| 77 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 78 | <td><nobr><b><tt id='l2h-3020' xml:id='l2h-3020' class="function">fork</tt></b>(</nobr></td> | |
| 79 | <td><var></var>)</td></tr></table></dt> | |
| 80 | <dd> | |
| 81 | Fork. Connect the child's controlling terminal to a pseudo-terminal. | |
| 82 | Return value is <code>(<var>pid</var>, <var>fd</var>)</code>. Note that the child | |
| 83 | gets <var>pid</var> 0, and the <var>fd</var> is <em>invalid</em>. The parent's | |
| 84 | return value is the <var>pid</var> of the child, and <var>fd</var> is a file | |
| 85 | descriptor connected to the child's controlling terminal (and also | |
| 86 | to the child's standard input and output). | |
| 87 | </dl> | |
| 88 | ||
| 89 | <P> | |
| 90 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 91 | <td><nobr><b><tt id='l2h-3021' xml:id='l2h-3021' class="function">openpty</tt></b>(</nobr></td> | |
| 92 | <td><var></var>)</td></tr></table></dt> | |
| 93 | <dd> | |
| 94 | Open a new pseudo-terminal pair, using <tt class="function">os.openpty()</tt> if | |
| 95 | possible, or emulation code for SGI and generic <span class="Unix">Unix</span> systems. | |
| 96 | Return a pair of file descriptors <code>(<var>master</var>, <var>slave</var>)</code>, | |
| 97 | for the master and the slave end, respectively. | |
| 98 | </dl> | |
| 99 | ||
| 100 | <P> | |
| 101 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 102 | <td><nobr><b><tt id='l2h-3022' xml:id='l2h-3022' class="function">spawn</tt></b>(</nobr></td> | |
| 103 | <td><var>argv</var><big>[</big><var>, master_read</var><big>[</big><var>, stdin_read</var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt> | |
| 104 | <dd> | |
| 105 | Spawn a process, and connect its controlling terminal with the current | |
| 106 | process's standard io. This is often used to baffle programs which | |
| 107 | insist on reading from the controlling terminal. | |
| 108 | ||
| 109 | <P> | |
| 110 | The functions <var>master_read</var> and <var>stdin_read</var> should be | |
| 111 | functions which read from a file-descriptor. The defaults try to read | |
| 112 | 1024 bytes each time they are called. | |
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