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55 | <H2><A NAME="SECTION0024110000000000000000"></A><A NAME="msvcrt-files"></A> | |
56 | <BR> | |
57 | 22.1.1 File Operations | |
58 | </H2> | |
59 | ||
60 | <P> | |
61 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
62 | <td><nobr><b><tt id='l2h-5240' xml:id='l2h-5240' class="function">locking</tt></b>(</nobr></td> | |
63 | <td><var>fd, mode, nbytes</var>)</td></tr></table></dt> | |
64 | <dd> | |
65 | Lock part of a file based on file descriptor <var>fd</var> from the C | |
66 | runtime. Raises <tt class="exception">IOError</tt> on failure. The locked region | |
67 | of the file extends from the current file position for <var>nbytes</var> | |
68 | bytes, and may continue beyond the end of the file. <var>mode</var> must | |
69 | be one of the <tt class="constant">LK_<var>*</var></tt> constants listed below. | |
70 | Multiple regions in a file may be locked at the same time, but may | |
71 | not overlap. Adjacent regions are not merged; they must be unlocked | |
72 | individually. | |
73 | </dl> | |
74 | ||
75 | <P> | |
76 | <dl><dt><b><tt id='l2h-5241' xml:id='l2h-5241'>LK_LOCK</tt></b></dt> | |
77 | <dd> | |
78 | <dt><b><tt id='l2h-5247' xml:id='l2h-5247'>LK_RLCK</tt></b></dt><dd> | |
79 | Locks the specified bytes. If the bytes cannot be locked, the | |
80 | program immediately tries again after 1 second. If, after 10 | |
81 | attempts, the bytes cannot be locked, <tt class="exception">IOError</tt> is | |
82 | raised. | |
83 | </dd></dl> | |
84 | ||
85 | <P> | |
86 | <dl><dt><b><tt id='l2h-5242' xml:id='l2h-5242'>LK_NBLCK</tt></b></dt> | |
87 | <dd> | |
88 | <dt><b><tt id='l2h-5248' xml:id='l2h-5248'>LK_NBRLCK</tt></b></dt><dd> | |
89 | Locks the specified bytes. If the bytes cannot be locked, | |
90 | <tt class="exception">IOError</tt> is raised. | |
91 | </dd></dl> | |
92 | ||
93 | <P> | |
94 | <dl><dt><b><tt id='l2h-5243' xml:id='l2h-5243'>LK_UNLCK</tt></b></dt> | |
95 | <dd> | |
96 | Unlocks the specified bytes, which must have been previously locked. | |
97 | </dd></dl> | |
98 | ||
99 | <P> | |
100 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
101 | <td><nobr><b><tt id='l2h-5244' xml:id='l2h-5244' class="function">setmode</tt></b>(</nobr></td> | |
102 | <td><var>fd, flags</var>)</td></tr></table></dt> | |
103 | <dd> | |
104 | Set the line-end translation mode for the file descriptor <var>fd</var>. | |
105 | To set it to text mode, <var>flags</var> should be <tt class="constant">os.O_TEXT</tt>; | |
106 | for binary, it should be <tt class="constant">os.O_BINARY</tt>. | |
107 | </dl> | |
108 | ||
109 | <P> | |
110 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
111 | <td><nobr><b><tt id='l2h-5245' xml:id='l2h-5245' class="function">open_osfhandle</tt></b>(</nobr></td> | |
112 | <td><var>handle, flags</var>)</td></tr></table></dt> | |
113 | <dd> | |
114 | Create a C runtime file descriptor from the file handle | |
115 | <var>handle</var>. The <var>flags</var> parameter should be a bit-wise OR of | |
116 | <tt class="constant">os.O_APPEND</tt>, <tt class="constant">os.O_RDONLY</tt>, and | |
117 | <tt class="constant">os.O_TEXT</tt>. The returned file descriptor may be used as a | |
118 | parameter to <tt class="function">os.fdopen()</tt> to create a file object. | |
119 | </dl> | |
120 | ||
121 | <P> | |
122 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
123 | <td><nobr><b><tt id='l2h-5246' xml:id='l2h-5246' class="function">get_osfhandle</tt></b>(</nobr></td> | |
124 | <td><var>fd</var>)</td></tr></table></dt> | |
125 | <dd> | |
126 | Return the file handle for the file descriptor <var>fd</var>. Raises | |
127 | <tt class="exception">IOError</tt> if <var>fd</var> is not recognized. | |
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