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Add const to error and newstring functions
author Guido van Rossum <guido@python.org>
date Tue, 10 Dec 1996 15:33:34 +0000
parents 65d2d8e67da3
children 00fd6857f76b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
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4
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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 and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI or Corporation for National Research Initiatives or
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13 CNRI not be used in advertising or publicity pertaining to
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14 distribution of the software without specific, written prior
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15 permission.
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16
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17 While CWI is the initial source for this software, a modified version
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18 is made available by the Corporation for National Research Initiatives
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19 (CNRI) at the Internet address ftp://ftp.python.org.
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20
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21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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28 PERFORMANCE OF THIS SOFTWARE.
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30 ******************************************************************/
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31
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32 /* Error handling -- see also run.c */
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33
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34 /* New error handling interface.
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35
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36 The following problem exists (existed): methods of built-in modules
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37 are called with 'self' and 'args' arguments, but without a context
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38 argument, so they have no way to raise a specific exception.
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39 The same is true for the object implementations: no context argument.
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40 The old convention was to set 'errno' and to return NULL.
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41 The caller (usually call_function() in eval.c) detects the NULL
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42 return value and then calls puterrno(ctx) to turn the errno value
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43 into a true exception. Problems with this approach are:
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44 - it used standard errno values to indicate Python-specific errors,
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45 but this means that when such an error code is reported by a system
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46 call (e.g., in module posix), the user gets a confusing message
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47 - errno is a global variable, which makes extensions to a multi-
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48 threading environment difficult; e.g., in IRIX, multi-threaded
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49 programs must use the function oserror() instead of looking in errno
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50 - there is no portable way to add new error numbers for specic
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51 situations -- the value space for errno is reserved to the OS, yet
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52 the way to turn module-specific errors into a module-specific
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53 exception requires module-specific values for errno
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54 - there is no way to add a more situation-specific message to an
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55 error.
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56
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57 The new interface solves all these problems. To return an error, a
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58 built-in function calls err_set(exception), err_setval(exception,
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59 value) or err_setstr(exception, string), and returns NULL. These
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60 functions save the value for later use by puterrno(). To adapt this
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61 scheme to a multi-threaded environment, only the implementation of
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62 err_setval() has to be changed.
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63 */
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64
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65 #include "allobjects.h"
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66 #include "traceback.h"
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67
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68 #include <errno.h>
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69
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70 #ifdef SYMANTEC__CFM68K__
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71 #pragma lib_export on
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72 #endif
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73
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74 #ifdef macintosh
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75 /* Replace strerror with a Mac specific routine.
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76 XXX PROBLEM: some positive errors have a meaning for MacOS,
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77 but some library routines set Unix error numbers...
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78 */
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79 extern char *PyMac_StrError PROTO((int));
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80 #undef strerror
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81 #define strerror PyMac_StrError
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82 #endif /* macintosh */
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83
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84 #ifndef __STDC__
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85 extern char *strerror PROTO((int));
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86 #endif
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87
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88 /* Last exception stored by err_setval() */
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89
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90 static object *last_exception;
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91 static object *last_exc_val;
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92
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93 void
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94 err_restore(exception, value, traceback)
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95 object *exception;
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96 object *value;
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97 object *traceback;
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98 {
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99 err_clear();
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100
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101 last_exception = exception;
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102 last_exc_val = value;
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103 (void) tb_store(traceback);
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104 XDECREF(traceback);
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105 }
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106
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107 void
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108 err_setval(exception, value)
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109 object *exception;
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110 object *value;
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111 {
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112 XINCREF(exception);
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113 XINCREF(value);
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114 err_restore(exception, value, (object *)NULL);
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115 }
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116
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117 void
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118 err_set(exception)
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119 object *exception;
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120 {
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121 err_setval(exception, (object *)NULL);
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122 }
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123
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124 void
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125 err_setstr(exception, string)
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126 object *exception;
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127 const char *string;
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128 {
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129 object *value = newstringobject(string);
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130 err_setval(exception, value);
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131 XDECREF(value);
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132 }
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133
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134
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135 object *
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136 err_occurred()
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137 {
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138 return last_exception;
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139 }
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140
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141 void
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142 err_fetch(p_exc, p_val, p_tb)
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143 object **p_exc;
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144 object **p_val;
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145 object **p_tb;
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146 {
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147 *p_exc = last_exception;
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148 last_exception = NULL;
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149 *p_val = last_exc_val;
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150 last_exc_val = NULL;
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151 *p_tb = tb_fetch();
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152 }
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153
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154 void
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155 err_clear()
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156 {
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157 object *tb;
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158 XDECREF(last_exception);
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159 last_exception = NULL;
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160 XDECREF(last_exc_val);
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161 last_exc_val = NULL;
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162 /* Also clear interpreter stack trace */
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163 tb = tb_fetch();
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164 XDECREF(tb);
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165 }
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166
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167 /* Convenience functions to set a type error exception and return 0 */
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168
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169 int
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170 err_badarg()
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171 {
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172 err_setstr(TypeError, "illegal argument type for built-in operation");
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173 return 0;
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174 }
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175
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176 object *
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177 err_nomem()
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178 {
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179 err_set(MemoryError);
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180 return NULL;
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181 }
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182
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183 object *
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184 err_errno(exc)
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185 object *exc;
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186 {
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187 object *v;
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188 int i = errno;
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189 #ifdef EINTR
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190 if (i == EINTR && sigcheck())
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191 return NULL;
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192 #endif
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193 v = mkvalue("(is)", i, strerror(i));
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194 if (v != NULL) {
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195 err_setval(exc, v);
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196 DECREF(v);
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197 }
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198 return NULL;
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199 }
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200
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201 void
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202 err_badcall()
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203 {
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204 err_setstr(SystemError, "bad argument to internal function");
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205 }