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annotate Modules/fpectlmodule.c @ 16798:258dcafe2d0b legacy-trunk

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Gustavo Niemeyer <niemeyer@conectiva.com>: Fixed recno support (keys are integers rather than strings). Work around DB bug that cause stdin to be closed by rnopen() when the DB file needed to exist but did not (no longer segfaults). This closes SF tracker patch #403445. Also wrapped some long lines and added whitespace around operators -- FLD.
author Fred Drake <fdrake@acm.org>
date Tue, 27 Feb 2001 18:56:46 +0000
parents 3693abd0eac1
children 99de4bf2b9e5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 ---------------------------------------------------------------------
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3 / Copyright (c) 1996. \
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4 | The Regents of the University of California. |
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5 | All rights reserved. |
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6 | |
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7 | Permission to use, copy, modify, and distribute this software for |
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8 | any purpose without fee is hereby granted, provided that this en- |
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9 | tire notice is included in all copies of any software which is or |
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10 | includes a copy or modification of this software and in all |
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11 | copies of the supporting documentation for such software. |
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12 | |
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13 | This work was produced at the University of California, Lawrence |
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14 | Livermore National Laboratory under contract no. W-7405-ENG-48 |
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15 | between the U.S. Department of Energy and The Regents of the |
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16 | University of California for the operation of UC LLNL. |
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17 | |
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18 | DISCLAIMER |
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19 | |
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20 | This software was prepared as an account of work sponsored by an |
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21 | agency of the United States Government. Neither the United States |
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22 | Government nor the University of California nor any of their em- |
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23 | ployees, makes any warranty, express or implied, or assumes any |
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24 | liability or responsibility for the accuracy, completeness, or |
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25 | usefulness of any information, apparatus, product, or process |
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26 | disclosed, or represents that its use would not infringe |
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27 | privately-owned rights. Reference herein to any specific commer- |
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28 | cial products, process, or service by trade name, trademark, |
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29 | manufacturer, or otherwise, does not necessarily constitute or |
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30 | imply its endorsement, recommendation, or favoring by the United |
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31 | States Government or the University of California. The views and |
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32 | opinions of authors expressed herein do not necessarily state or |
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33 | reflect those of the United States Government or the University |
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34 | of California, and shall not be used for advertising or product |
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35 \ endorsement purposes. /
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36 ---------------------------------------------------------------------
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37 */
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38
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39 /*
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40 Floating point exception control module.
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41
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42 This Python module provides bare-bones control over floating point
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43 units from several hardware manufacturers. Specifically, it allows
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44 the user to turn on the generation of SIGFPE whenever any of the
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45 three serious IEEE 754 exceptions (Division by Zero, Overflow,
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46 Invalid Operation) occurs. We currently ignore Underflow and
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47 Inexact Result exceptions, although those could certainly be added
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48 if desired.
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49
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50 The module also establishes a signal handler for SIGFPE during
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51 initialization. This builds on code found in the Python
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52 distribution at Include/pyfpe.h and Python/pyfpe.c. If those files
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53 are not in your Python distribution, find them in a patch at
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54 ftp://icf.llnl.gov/pub/python/busby/patches.961108.tgz.
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55
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56 This module is only useful to you if it happens to include code
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57 specific for your hardware and software environment. If you can
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58 contribute OS-specific code for new platforms, or corrections for
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59 the code provided, it will be greatly appreciated.
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60
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61 ** Version 1.0: September 20, 1996. Lee Busby, LLNL.
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62 */
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63
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64 #ifdef __cplusplus
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65 extern "C" {
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66 #endif
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67
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68 #include "Python.h"
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69 #include <signal.h>
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70
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71 #if defined(__FreeBSD__)
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72 # include <ieeefp.h>
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73 #endif
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74
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75 #ifndef WANT_SIGFPE_HANDLER
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76 /* Define locally if they are not defined in Python. This gives only
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77 * the limited control to induce a core dump in case of an exception.
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78 */
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79 #include <setjmp.h>
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80 static jmp_buf PyFPE_jbuf;
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81 static int PyFPE_counter = 0;
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82 #endif
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83
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84 typedef void Sigfunc(int);
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85 static Sigfunc sigfpe_handler;
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86 static void fpe_reset(Sigfunc *);
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87
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88 static PyObject *fpe_error;
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89 DL_EXPORT(void) initfpectl(void);
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90 static PyObject *turnon_sigfpe (PyObject *self,PyObject *args);
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91 static PyObject *turnoff_sigfpe (PyObject *self,PyObject *args);
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92
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93 static PyMethodDef fpectl_methods[] = {
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94 {"turnon_sigfpe", (PyCFunction) turnon_sigfpe, 1},
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95 {"turnoff_sigfpe", (PyCFunction) turnoff_sigfpe, 1},
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96 {0,0}
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97 };
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98
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99 static PyObject *turnon_sigfpe(PyObject *self,PyObject *args)
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100 {
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101 /* Do any architecture-specific one-time only initialization here. */
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102
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103 fpe_reset(sigfpe_handler);
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104 Py_INCREF (Py_None);
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105 return Py_None;
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106 }
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107
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108 static void fpe_reset(Sigfunc *handler)
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109 {
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110 /* Reset the exception handling machinery, and reset the signal
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111 * handler for SIGFPE to the given handler.
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112 */
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113
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114 /*-- IRIX -----------------------------------------------------------------*/
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115 #if defined(sgi)
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116 /* See man page on handle_sigfpes -- must link with -lfpe
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117 * My usage doesn't follow the man page exactly. Maybe somebody
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118 * else can explain handle_sigfpes to me....
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119 * cc -c -I/usr/local/python/include fpectlmodule.c
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120 * ld -shared -o fpectlmodule.so fpectlmodule.o -lfpe
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121 */
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122 #include <sigfpe.h>
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123 typedef void user_routine (unsigned[5], int[2]);
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124 typedef void abort_routine (unsigned long);
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125 handle_sigfpes(_OFF, 0,
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126 (user_routine *)0,
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127 _TURN_OFF_HANDLER_ON_ERROR,
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128 NULL);
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129 handle_sigfpes(_ON, _EN_OVERFL | _EN_DIVZERO | _EN_INVALID,
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130 (user_routine *)0,
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131 _ABORT_ON_ERROR,
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132 NULL);
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133 PyOS_setsig(SIGFPE, handler);
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134
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135 /*-- SunOS and Solaris ----------------------------------------------------*/
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136 #elif defined(sun)
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137 /* References: ieee_handler, ieee_sun, ieee_functions, and ieee_flags
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138 man pages (SunOS or Solaris)
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139 cc -c -I/usr/local/python/include fpectlmodule.c
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140 ld -G -o fpectlmodule.so -L/opt/SUNWspro/lib fpectlmodule.o -lsunmath -lm
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141 */
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142 #include <math.h>
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143 char *mode="exception", *in="all", *out;
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144 (void) nonstandard_arithmetic();
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145 (void) ieee_flags("clearall",mode,in,&out);
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146 (void) ieee_handler("set","common",(sigfpe_handler_type)handler);
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147 PyOS_setsig(SIGFPE, handler);
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148
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149 /*-- HPUX -----------------------------------------------------------------*/
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150 #elif defined(__hppa) || defined(hppa)
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151 /* References: fpsetmask man page */
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152 /* cc -Aa +z -c -I/usr/local/python/include fpectlmodule.c */
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153 /* ld -b -o fpectlmodule.sl fpectlmodule.o -lm */
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154 #include <math.h>
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155 fpsetdefaults();
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156 PyOS_setsig(SIGFPE, handler);
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157
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158 /*-- IBM AIX --------------------------------------------------------------*/
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159 #elif defined(__AIX) || defined(_AIX)
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160 /* References: fp_trap, fp_enable man pages */
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161 #include <fptrap.h>
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162 fp_trap(FP_TRAP_SYNC);
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163 fp_enable(TRP_INVALID | TRP_DIV_BY_ZERO | TRP_OVERFLOW);
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164 PyOS_setsig(SIGFPE, handler);
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165
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166 /*-- DEC ALPHA OSF --------------------------------------------------------*/
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167 #elif defined(__alpha) && defined(__osf__)
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168 /* References: exception_intro, ieee man pages */
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169 /* cc -c -I/usr/local/python/include fpectlmodule.c */
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170 /* ld -shared -o fpectlmodule.so fpectlmodule.o */
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171 #include <machine/fpu.h>
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172 unsigned long fp_control =
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173 IEEE_TRAP_ENABLE_INV | IEEE_TRAP_ENABLE_DZE | IEEE_TRAP_ENABLE_OVF;
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174 ieee_set_fp_control(fp_control);
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175 PyOS_setsig(SIGFPE, handler);
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176
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177 /*-- Cray Unicos ----------------------------------------------------------*/
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178 #elif defined(cray)
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179 /* UNICOS delivers SIGFPE by default, but no matherr */
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180 #ifdef HAS_LIBMSET
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181 libmset(-1);
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182 #endif
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183 PyOS_setsig(SIGFPE, handler);
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184
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185 /*-- FreeBSD ----------------------------------------------------------------*/
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186 #elif defined(__FreeBSD__)
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187 fpresetsticky(fpgetsticky());
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188 fpsetmask(FP_X_INV | FP_X_DZ | FP_X_OFL);
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189 PyOS_setsig(SIGFPE, handler);
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190
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191 /*-- Linux ----------------------------------------------------------------*/
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192 #elif defined(linux)
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193 #ifdef __GLIBC__
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194 #include <fpu_control.h>
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195 #else
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196 #include <i386/fpu_control.h>
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197 #endif
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198 #ifdef _FPU_SETCW
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199 {
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200 fpu_control_t cw = 0x1372;
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201 _FPU_SETCW(cw);
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202 }
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203 #else
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204 __setfpucw(0x1372);
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205 #endif
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206 PyOS_setsig(SIGFPE, handler);
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207
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208 /*-- NeXT -----------------------------------------------------------------*/
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209 #elif defined(NeXT) && defined(m68k) && defined(__GNUC__)
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210 /* NeXT needs explicit csr set to generate SIGFPE */
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211 asm("fmovel #0x1400,fpcr"); /* set OVFL and ZD bits */
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212 PyOS_setsig(SIGFPE, handler);
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213
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214 /*-- Microsoft Windows, NT ------------------------------------------------*/
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215 #elif defined(_MSC_VER)
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216 /* Reference: Visual C++ Books Online 4.2,
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217 Run-Time Library Reference, _control87, _controlfp */
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218 #include <float.h>
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219 unsigned int cw = _EM_INVALID | _EM_ZERODIVIDE | _EM_OVERFLOW;
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220 (void)_controlfp(0, cw);
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221 PyOS_setsig(SIGFPE, handler);
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222
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223 /*-- Give Up --------------------------------------------------------------*/
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224 #else
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225 fputs("Operation not implemented\n", stderr);
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226 #endif
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227
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228 }
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229
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230 static PyObject *turnoff_sigfpe(PyObject *self,PyObject *args)
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231 {
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232 #ifdef __FreeBSD__
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233 fpresetsticky(fpgetsticky());
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234 fpsetmask(0);
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235 #else
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236 fputs("Operation not implemented\n", stderr);
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237 #endif
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238 Py_INCREF(Py_None);
5120
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239 return Py_None;
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240 }
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241
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242 static void sigfpe_handler(int signo)
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243 {
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244 fpe_reset(sigfpe_handler);
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diff changeset
245 if(PyFPE_counter) {
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246 longjmp(PyFPE_jbuf, 1);
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247 } else {
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248 Py_FatalError("Unprotected floating point exception");
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249 }
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250 }
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251
9588
38023a425e48 Add DL_EXPORT() to all modules that could possibly be used
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252 DL_EXPORT(void) initfpectl(void)
5120
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253 {
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254 PyObject *m, *d;
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255 m = Py_InitModule("fpectl", fpectl_methods);
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256 d = PyModule_GetDict(m);
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257 fpe_error = PyErr_NewException("fpectl.error", NULL, NULL);
2c29b8982643 Apply two changes, systematically:
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diff changeset
258 if (fpe_error != NULL)
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259 PyDict_SetItemString(d, "error", fpe_error);
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260 }
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261
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262 #ifdef __cplusplus
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263 }
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264 #endif