author | martin.trojer@nokia.com |
Fri, 31 Jul 2009 15:01:17 +0100 | |
changeset 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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.. highlightlang:: c |
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.. _os: |
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Operating System Utilities |
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========================== |
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.. cfunction:: int Py_FdIsInteractive(FILE *fp, const char *filename) |
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Return true (nonzero) if the standard I/O file *fp* with name *filename* is |
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deemed interactive. This is the case for files for which ``isatty(fileno(fp))`` |
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is true. If the global flag :cdata:`Py_InteractiveFlag` is true, this function |
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also returns true if the *filename* pointer is *NULL* or if the name is equal to |
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one of the strings ``'<stdin>'`` or ``'???'``. |
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.. cfunction:: long PyOS_GetLastModificationTime(char *filename) |
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Return the time of last modification of the file *filename*. The result is |
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encoded in the same way as the timestamp returned by the standard C library |
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function :cfunc:`time`. |
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.. cfunction:: void PyOS_AfterFork() |
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Function to update some internal state after a process fork; this should be |
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called in the new process if the Python interpreter will continue to be used. |
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If a new executable is loaded into the new process, this function does not need |
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to be called. |
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.. cfunction:: int PyOS_CheckStack() |
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Return true when the interpreter runs out of stack space. This is a reliable |
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check, but is only available when :const:`USE_STACKCHECK` is defined (currently |
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on Windows using the Microsoft Visual C++ compiler). :const:`USE_STACKCHECK` |
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will be defined automatically; you should never change the definition in your |
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own code. |
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.. cfunction:: PyOS_sighandler_t PyOS_getsig(int i) |
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Return the current signal handler for signal *i*. This is a thin wrapper around |
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either :cfunc:`sigaction` or :cfunc:`signal`. Do not call those functions |
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directly! :ctype:`PyOS_sighandler_t` is a typedef alias for :ctype:`void |
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(\*)(int)`. |
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.. cfunction:: PyOS_sighandler_t PyOS_setsig(int i, PyOS_sighandler_t h) |
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Set the signal handler for signal *i* to be *h*; return the old signal handler. |
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This is a thin wrapper around either :cfunc:`sigaction` or :cfunc:`signal`. Do |
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not call those functions directly! :ctype:`PyOS_sighandler_t` is a typedef |
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alias for :ctype:`void (\*)(int)`. |
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.. _systemfunctions: |
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System Functions |
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================ |
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These are utility functions that make functionality from the :mod:`sys` module |
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accessible to C code. They all work with the current interpreter thread's |
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:mod:`sys` module's dict, which is contained in the internal thread state structure. |
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.. cfunction:: PyObject *PySys_GetObject(char *name) |
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Return the object *name* from the :mod:`sys` module or *NULL* if it does |
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not exist, without setting an exception. |
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.. cfunction:: FILE *PySys_GetFile(char *name, FILE *def) |
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Return the :ctype:`FILE*` associated with the object *name* in the |
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:mod:`sys` module, or *def* if *name* is not in the module or is not associated |
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with a :ctype:`FILE*`. |
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.. cfunction:: int PySys_SetObject(char *name, PyObject *v) |
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Set *name* in the :mod:`sys` module to *v* unless *v* is *NULL*, in which |
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case *name* is deleted from the sys module. Returns ``0`` on success, ``-1`` |
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on error. |
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.. cfunction:: void PySys_ResetWarnOptions(void) |
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Reset :data:`sys.warnoptions` to an empty list. |
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.. cfunction:: void PySys_AddWarnOption(char *s) |
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Append *s* to :data:`sys.warnoptions`. |
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.. cfunction:: void PySys_SetPath(char *path) |
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Set :data:`sys.path` to a list object of paths found in *path* which should |
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be a list of paths separated with the platform's search path delimiter |
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(``:`` on Unix, ``;`` on Windows). |
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.. cfunction:: void PySys_WriteStdout(const char *format, ...) |
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Write the output string described by *format* to :data:`sys.stdout`. No |
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exceptions are raised, even if truncation occurs (see below). |
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*format* should limit the total size of the formatted output string to |
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1000 bytes or less -- after 1000 bytes, the output string is truncated. |
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In particular, this means that no unrestricted "%s" formats should occur; |
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these should be limited using "%.<N>s" where <N> is a decimal number |
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106 |
calculated so that <N> plus the maximum size of other formatted text does not |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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107 |
exceed 1000 bytes. Also watch out for "%f", which can print hundreds of |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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108 |
digits for very large numbers. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
109 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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110 |
If a problem occurs, or :data:`sys.stdout` is unset, the formatted message |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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111 |
is written to the real (C level) *stdout*. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
112 |
|
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113 |
.. cfunction:: void PySys_WriteStderr(const char *format, ...) |
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114 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
115 |
As above, but write to :data:`sys.stderr` or *stderr* instead. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
116 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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117 |
|
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118 |
.. _processcontrol: |
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119 |
|
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120 |
Process Control |
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121 |
=============== |
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122 |
|
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123 |
|
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124 |
.. cfunction:: void Py_FatalError(const char *message) |
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125 |
|
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126 |
.. index:: single: abort() |
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127 |
|
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128 |
Print a fatal error message and kill the process. No cleanup is performed. |
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129 |
This function should only be invoked when a condition is detected that would |
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130 |
make it dangerous to continue using the Python interpreter; e.g., when the |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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131 |
object administration appears to be corrupted. On Unix, the standard C library |
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132 |
function :cfunc:`abort` is called which will attempt to produce a :file:`core` |
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133 |
file. |
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134 |
|
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135 |
|
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136 |
.. cfunction:: void Py_Exit(int status) |
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|
137 |
|
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138 |
.. index:: |
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139 |
single: Py_Finalize() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
140 |
single: exit() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
141 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
142 |
Exit the current process. This calls :cfunc:`Py_Finalize` and then calls the |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
143 |
standard C library function ``exit(status)``. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
144 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
145 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
146 |
.. cfunction:: int Py_AtExit(void (*func) ()) |
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|
147 |
|
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|
148 |
.. index:: |
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149 |
single: Py_Finalize() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
150 |
single: cleanup functions |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
151 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
152 |
Register a cleanup function to be called by :cfunc:`Py_Finalize`. The cleanup |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
153 |
function will be called with no arguments and should return no value. At most |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
154 |
32 cleanup functions can be registered. When the registration is successful, |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
155 |
:cfunc:`Py_AtExit` returns ``0``; on failure, it returns ``-1``. The cleanup |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
156 |
function registered last is called first. Each cleanup function will be called |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
157 |
at most once. Since Python's internal finalization will have completed before |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
158 |
the cleanup function, no Python APIs should be called by *func*. |