Mercurial > cpython-lru_cache-weakref
annotate Python/errors.c @ 1319:cd397266dc1c legacy-trunk
* Makefile: added all: and default: targets.
* many files: made some functions static; removed "extern int errno;".
* frozenmain.c: fixed bugs introduced on 24 June...
* flmodule.c: remove 1.5 bw compat hacks, add new functions in 2.2a
(and some old functions that were omitted).
* timemodule.c: added MSDOS floatsleep version .
* pgenmain.c: changed exit() to goaway() and added defn of goaway().
* intrcheck.c: add hack (to UNIX only) so interrupting 3 times
will exit from a hanging program. The second interrupt prints
a message explaining this to the user.
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Mon, 05 Jul 1993 10:31:29 +0000 |
| parents | c4cd0d9d8281 |
| children | 79e420805c67 |
| rev | line source |
|---|---|
| 145 | 1 /*********************************************************** |
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2 Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum, |
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3 Amsterdam, The Netherlands. |
| 145 | 4 |
| 5 All Rights Reserved | |
| 6 | |
| 7 Permission to use, copy, modify, and distribute this software and its | |
| 8 documentation for any purpose and without fee is hereby granted, | |
| 9 provided that the above copyright notice appear in all copies and that | |
| 10 both that copyright notice and this permission notice appear in | |
| 11 supporting documentation, and that the names of Stichting Mathematisch | |
| 12 Centrum or CWI not be used in advertising or publicity pertaining to | |
| 13 distribution of the software without specific, written prior permission. | |
| 14 | |
| 15 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO | |
| 16 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND | |
| 17 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE | |
| 18 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
| 19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
| 20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT | |
| 21 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
| 22 | |
| 23 ******************************************************************/ | |
| 24 | |
| 6 | 25 /* Error handling -- see also run.c */ |
| 26 | |
| 27 /* New error handling interface. | |
| 28 | |
| 29 The following problem exists (existed): methods of built-in modules | |
| 30 are called with 'self' and 'args' arguments, but without a context | |
| 31 argument, so they have no way to raise a specific exception. | |
| 32 The same is true for the object implementations: no context argument. | |
| 33 The old convention was to set 'errno' and to return NULL. | |
| 34 The caller (usually call_function() in eval.c) detects the NULL | |
| 35 return value and then calls puterrno(ctx) to turn the errno value | |
| 36 into a true exception. Problems with this approach are: | |
| 37 - it used standard errno values to indicate Python-specific errors, | |
| 86 | 38 but this means that when such an error code is reported by a system |
| 39 call (e.g., in module posix), the user gets a confusing message | |
| 6 | 40 - errno is a global variable, which makes extensions to a multi- |
| 41 threading environment difficult; e.g., in IRIX, multi-threaded | |
| 86 | 42 programs must use the function oserror() instead of looking in errno |
| 6 | 43 - there is no portable way to add new error numbers for specic |
| 44 situations -- the value space for errno is reserved to the OS, yet | |
| 45 the way to turn module-specific errors into a module-specific | |
| 46 exception requires module-specific values for errno | |
| 47 - there is no way to add a more situation-specific message to an | |
| 48 error. | |
| 49 | |
| 50 The new interface solves all these problems. To return an error, a | |
| 86 | 51 built-in function calls err_set(exception), err_setval(exception, |
| 6 | 52 value) or err_setstr(exception, string), and returns NULL. These |
| 53 functions save the value for later use by puterrno(). To adapt this | |
| 54 scheme to a multi-threaded environment, only the implementation of | |
| 55 err_setval() has to be changed. | |
| 56 */ | |
| 57 | |
|
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58 #include "allobjects.h" |
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59 #include "modsupport.h" |
| 6 | 60 |
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61 #include <errno.h> |
| 86 | 62 |
| 63 #include "errcode.h" | |
| 6 | 64 |
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59
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65 extern char *strerror PROTO((int)); |
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66 |
| 6 | 67 /* Last exception stored by err_setval() */ |
| 68 | |
| 69 static object *last_exception; | |
| 70 static object *last_exc_val; | |
| 71 | |
| 72 void | |
| 73 err_setval(exception, value) | |
| 74 object *exception; | |
| 75 object *value; | |
| 76 { | |
| 86 | 77 XDECREF(last_exception); |
| 78 XINCREF(exception); | |
| 6 | 79 last_exception = exception; |
| 80 | |
| 86 | 81 XDECREF(last_exc_val); |
| 82 XINCREF(value); | |
| 6 | 83 last_exc_val = value; |
| 84 } | |
| 85 | |
| 86 void | |
| 87 err_set(exception) | |
| 88 object *exception; | |
| 89 { | |
| 90 err_setval(exception, (object *)NULL); | |
| 91 } | |
| 92 | |
| 93 void | |
| 94 err_setstr(exception, string) | |
| 95 object *exception; | |
| 96 char *string; | |
| 97 { | |
| 98 object *value = newstringobject(string); | |
| 99 err_setval(exception, value); | |
| 86 | 100 XDECREF(value); |
| 6 | 101 } |
| 102 | |
| 103 int | |
| 104 err_occurred() | |
| 105 { | |
| 106 return last_exception != NULL; | |
| 107 } | |
| 108 | |
| 109 void | |
| 110 err_get(p_exc, p_val) | |
| 111 object **p_exc; | |
| 112 object **p_val; | |
| 113 { | |
| 114 *p_exc = last_exception; | |
| 115 last_exception = NULL; | |
| 116 *p_val = last_exc_val; | |
| 117 last_exc_val = NULL; | |
| 118 } | |
| 119 | |
| 120 void | |
| 121 err_clear() | |
| 122 { | |
| 86 | 123 XDECREF(last_exception); |
| 124 last_exception = NULL; | |
| 125 XDECREF(last_exc_val); | |
| 126 last_exc_val = NULL; | |
| 6 | 127 } |
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128 |
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129 /* Convenience functions to set a type error exception and return 0 */ |
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130 |
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131 int |
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132 err_badarg() |
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133 { |
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134 err_setstr(TypeError, "illegal argument type for built-in operation"); |
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135 return 0; |
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136 } |
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137 |
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138 object * |
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139 err_nomem() |
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140 { |
| 86 | 141 err_set(MemoryError); |
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142 return NULL; |
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143 } |
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144 |
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145 object * |
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146 err_errno(exc) |
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147 object *exc; |
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148 { |
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149 object *v; |
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150 if (errno == EINTR && intrcheck()) { |
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151 err_set(KeyboardInterrupt); |
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152 return NULL; |
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153 } |
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154 v = mkvalue("(is)", errno, strerror(errno)); |
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155 if (v != NULL) { |
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156 err_setval(exc, v); |
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157 DECREF(v); |
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158 } |
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159 return NULL; |
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160 } |
| 22 | 161 |
| 162 void | |
| 163 err_badcall() | |
| 164 { | |
| 165 err_setstr(SystemError, "bad argument to internal function"); | |
| 166 } | |
| 86 | 167 |
| 168 /* Set the error appropriate to the given input error code (see errcode.h) */ | |
| 169 | |
| 170 void | |
| 171 err_input(err) | |
| 172 int err; | |
| 173 { | |
| 174 switch (err) { | |
| 175 case E_DONE: | |
| 176 case E_OK: | |
| 177 break; | |
| 178 case E_SYNTAX: | |
| 484 | 179 err_setstr(SyntaxError, "invalid syntax"); |
| 86 | 180 break; |
| 181 case E_TOKEN: | |
| 484 | 182 err_setstr(SyntaxError, "invalid token"); |
| 86 | 183 break; |
| 184 case E_INTR: | |
| 185 err_set(KeyboardInterrupt); | |
| 186 break; | |
| 187 case E_NOMEM: | |
| 188 err_nomem(); | |
| 189 break; | |
| 190 case E_EOF: | |
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191 err_setstr(SyntaxError, "unexpected EOF while parsing"); |
| 86 | 192 break; |
| 193 default: | |
| 484 | 194 err_setstr(SystemError, "unknown parsing error"); |
| 86 | 195 break; |
| 196 } | |
| 197 } |