Mercurial > cpython-lru_cache-weakref
annotate Python/sysmodule.c @ 6600:83ccf44bf195 legacy-trunk
Two changes (here we go again :-( ).
1) The __builtins__ variable in the __main__ module is set to the
__builtin__ module instead of its __dict__.
2) Get rid of the SIGHUP and SIGTERM handlers. They can't be made to
work reliably when threads may be in use, they are Unix specific, and
Python programmers can now program this functionality is a safer way
using the signal module.
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Wed, 19 Nov 1997 16:15:37 +0000 |
| parents | f406ec35bfca |
| children | c7454ca7d3ac |
| rev | line source |
|---|---|
| 145 | 1 /*********************************************************** |
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam, |
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3 The Netherlands. |
| 145 | 4 |
| 5 All Rights Reserved | |
| 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, |
| 145 | 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 |
| 145 | 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. |
| 145 | 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. |
| 145 | 29 |
| 30 ******************************************************************/ | |
| 31 | |
| 6 | 32 /* System module */ |
| 33 | |
| 34 /* | |
| 35 Various bits of information used by the interpreter are collected in | |
| 36 module 'sys'. | |
| 86 | 37 Function member: |
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38 - exit(sts): raise SystemExit |
| 6 | 39 Data members: |
| 40 - stdin, stdout, stderr: standard file objects | |
| 86 | 41 - modules: the table of modules (dictionary) |
| 6 | 42 - path: module search path (list of strings) |
| 86 | 43 - argv: script arguments (list of strings) |
| 44 - ps1, ps2: optional primary and secondary prompts (strings) | |
| 6 | 45 */ |
| 46 | |
| 5372 | 47 #include "Python.h" |
| 86 | 48 |
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49 #include "osdefs.h" |
| 86 | 50 |
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51 #ifdef HAVE_UNISTD_H |
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52 #include <unistd.h> |
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53 #endif |
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54 |
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55 #ifdef MS_COREDLL |
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56 extern void *PyWin_DLLhModule; |
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57 /* A string loaded from the DLL at startup: */ |
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58 extern const char *PyWin_DLLVersionString; |
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59 #endif |
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60 |
| 5372 | 61 PyObject * |
| 62 PySys_GetObject(name) | |
| 6 | 63 char *name; |
| 64 { | |
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65 PyThreadState *tstate = PyThreadState_Get(); |
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66 PyObject *sd = tstate->interp->sysdict; |
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67 return PyDict_GetItemString(sd, name); |
| 6 | 68 } |
| 69 | |
| 70 FILE * | |
| 5372 | 71 PySys_GetFile(name, def) |
| 6 | 72 char *name; |
| 73 FILE *def; | |
| 74 { | |
| 75 FILE *fp = NULL; | |
| 5372 | 76 PyObject *v = PySys_GetObject(name); |
| 77 if (v != NULL && PyFile_Check(v)) | |
| 78 fp = PyFile_AsFile(v); | |
| 6 | 79 if (fp == NULL) |
| 80 fp = def; | |
| 81 return fp; | |
| 82 } | |
| 83 | |
| 84 int | |
| 5372 | 85 PySys_SetObject(name, v) |
| 6 | 86 char *name; |
| 5372 | 87 PyObject *v; |
| 6 | 88 { |
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89 PyThreadState *tstate = PyThreadState_Get(); |
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90 PyObject *sd = tstate->interp->sysdict; |
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91 if (v == NULL) { |
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92 if (PyDict_GetItemString(sd, name) == NULL) |
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93 return 0; |
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94 else |
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95 return PyDict_DelItemString(sd, name); |
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96 } |
| 6 | 97 else |
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98 return PyDict_SetItemString(sd, name, v); |
| 6 | 99 } |
| 100 | |
| 5372 | 101 static PyObject * |
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102 sys_exc_info(self, args) |
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103 PyObject *self; |
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104 PyObject *args; |
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105 { |
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106 PyThreadState *tstate; |
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107 if (!PyArg_Parse(args, "")) |
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108 return NULL; |
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109 tstate = PyThreadState_Get(); |
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110 return Py_BuildValue( |
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111 "(OOO)", |
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112 tstate->exc_type != NULL ? tstate->exc_type : Py_None, |
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113 tstate->exc_value != NULL ? tstate->exc_value : Py_None, |
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114 tstate->exc_traceback != NULL ? |
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115 tstate->exc_traceback : Py_None); |
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116 } |
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117 |
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118 static PyObject * |
| 6 | 119 sys_exit(self, args) |
| 5372 | 120 PyObject *self; |
| 121 PyObject *args; | |
| 6 | 122 { |
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123 /* Raise SystemExit so callers may catch it or clean up. */ |
| 5372 | 124 PyErr_SetObject(PyExc_SystemExit, args); |
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125 return NULL; |
| 6 | 126 } |
| 127 | |
| 5372 | 128 static PyObject * |
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129 sys_settrace(self, args) |
| 5372 | 130 PyObject *self; |
| 131 PyObject *args; | |
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132 { |
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133 PyThreadState *tstate = PyThreadState_Get(); |
| 5372 | 134 if (args == Py_None) |
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135 args = NULL; |
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136 else |
| 5372 | 137 Py_XINCREF(args); |
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138 Py_XDECREF(tstate->sys_tracefunc); |
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139 tstate->sys_tracefunc = args; |
| 5372 | 140 Py_INCREF(Py_None); |
| 141 return Py_None; | |
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142 } |
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143 |
| 5372 | 144 static PyObject * |
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145 sys_setprofile(self, args) |
| 5372 | 146 PyObject *self; |
| 147 PyObject *args; | |
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148 { |
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149 PyThreadState *tstate = PyThreadState_Get(); |
| 5372 | 150 if (args == Py_None) |
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151 args = NULL; |
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152 else |
| 5372 | 153 Py_XINCREF(args); |
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154 Py_XDECREF(tstate->sys_profilefunc); |
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155 tstate->sys_profilefunc = args; |
| 5372 | 156 Py_INCREF(Py_None); |
| 157 return Py_None; | |
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158 } |
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159 |
| 5372 | 160 static PyObject * |
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161 sys_setcheckinterval(self, args) |
| 5372 | 162 PyObject *self; |
| 163 PyObject *args; | |
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164 { |
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165 PyThreadState *tstate = PyThreadState_Get(); |
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166 if (!PyArg_ParseTuple(args, "i", &tstate->interp->checkinterval)) |
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167 return NULL; |
| 5372 | 168 Py_INCREF(Py_None); |
| 169 return Py_None; | |
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170 } |
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171 |
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172 #ifdef USE_MALLOPT |
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173 /* Link with -lmalloc (or -lmpc) on an SGI */ |
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174 #include <malloc.h> |
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175 |
| 5372 | 176 static PyObject * |
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177 sys_mdebug(self, args) |
| 5372 | 178 PyObject *self; |
| 179 PyObject *args; | |
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180 { |
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181 int flag; |
| 5372 | 182 if (!PyArg_Parse(args, "i", &flag)) |
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183 return NULL; |
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184 mallopt(M_DEBUG, flag); |
| 5372 | 185 Py_INCREF(Py_None); |
| 186 return Py_None; | |
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187 } |
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188 #endif /* USE_MALLOPT */ |
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189 |
| 5372 | 190 static PyObject * |
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191 sys_getrefcount(self, args) |
| 5372 | 192 PyObject *self; |
| 193 PyObject *args; | |
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194 { |
| 5372 | 195 PyObject *arg; |
| 196 if (!PyArg_Parse(args, "O", &arg)) | |
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197 return NULL; |
| 5372 | 198 return PyInt_FromLong((long) arg->ob_refcnt); |
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199 } |
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200 |
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201 #ifdef COUNT_ALLOCS |
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202 static PyObject * |
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203 sys_getcounts(self, args) |
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204 PyObject *self, *args; |
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205 { |
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206 extern PyObject *get_counts Py_PROTO((void)); |
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207 |
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208 if (!PyArg_Parse(args, "")) |
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209 return NULL; |
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210 return get_counts(); |
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211 } |
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212 #endif |
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213 |
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214 #ifdef Py_TRACE_REFS |
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215 /* Defined in objects.c because it uses static globals if that file */ |
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216 extern PyObject *_Py_GetObjects Py_PROTO((PyObject *, PyObject *)); |
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217 #endif |
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218 |
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219 #ifdef DYNAMIC_EXECUTION_PROFILE |
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220 /* Defined in ceval.c because it uses static globals if that file */ |
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221 extern PyObject *_Py_GetDXProfile Py_PROTO((PyObject *, PyObject *)); |
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222 #endif |
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223 |
| 5372 | 224 static PyMethodDef sys_methods[] = { |
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225 /* Might as well keep this in alphabetic order */ |
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226 {"exc_info", sys_exc_info, 0}, |
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227 {"exit", sys_exit, 0}, |
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228 #ifdef COUNT_ALLOCS |
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229 {"getcounts", sys_getcounts, 0}, |
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230 #endif |
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231 #ifdef DYNAMIC_EXECUTION_PROFILE |
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232 {"getdxp", _Py_GetDXProfile, 1}, |
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233 #endif |
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234 #ifdef Py_TRACE_REFS |
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235 {"getobjects", _Py_GetObjects, 1}, |
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236 #endif |
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237 {"getrefcount", sys_getrefcount, 0}, |
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238 #ifdef USE_MALLOPT |
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239 {"mdebug", sys_mdebug, 0}, |
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240 #endif |
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241 {"setcheckinterval", sys_setcheckinterval, 1}, |
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242 {"setprofile", sys_setprofile, 0}, |
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243 {"settrace", sys_settrace, 0}, |
| 86 | 244 {NULL, NULL} /* sentinel */ |
| 245 }; | |
| 246 | |
| 5372 | 247 static PyObject * |
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248 list_builtin_module_names() |
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249 { |
| 5372 | 250 PyObject *list = PyList_New(0); |
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251 int i; |
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252 if (list == NULL) |
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253 return NULL; |
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254 for (i = 0; PyImport_Inittab[i].name != NULL; i++) { |
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255 PyObject *name = PyString_FromString( |
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256 PyImport_Inittab[i].name); |
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257 if (name == NULL) |
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258 break; |
| 5372 | 259 PyList_Append(list, name); |
| 260 Py_DECREF(name); | |
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261 } |
| 5372 | 262 if (PyList_Sort(list) != 0) { |
| 263 Py_DECREF(list); | |
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264 list = NULL; |
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265 } |
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266 if (list) { |
| 5372 | 267 PyObject *v = PyList_AsTuple(list); |
| 268 Py_DECREF(list); | |
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269 list = v; |
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270 } |
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271 return list; |
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272 } |
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273 |
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274 PyObject * |
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275 _PySys_Init() |
| 6 | 276 { |
| 5372 | 277 extern int fclose Py_PROTO((FILE *)); |
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278 PyObject *m, *v, *sysdict; |
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279 PyObject *sysin, *sysout, *syserr; |
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280 |
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281 m = Py_InitModule("sys", sys_methods); |
| 5372 | 282 sysdict = PyModule_GetDict(m); |
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283 |
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284 sysin = PyFile_FromFile(stdin, "<stdin>", "r", NULL); |
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285 sysout = PyFile_FromFile(stdout, "<stdout>", "w", NULL); |
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286 syserr = PyFile_FromFile(stderr, "<stderr>", "w", NULL); |
| 5372 | 287 if (PyErr_Occurred()) |
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288 return NULL; |
| 5372 | 289 PyDict_SetItemString(sysdict, "stdin", sysin); |
| 290 PyDict_SetItemString(sysdict, "stdout", sysout); | |
| 291 PyDict_SetItemString(sysdict, "stderr", syserr); | |
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292 Py_XDECREF(sysin); |
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293 Py_XDECREF(sysout); |
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294 Py_XDECREF(syserr); |
| 5372 | 295 PyDict_SetItemString(sysdict, "version", |
| 296 v = PyString_FromString(Py_GetVersion())); | |
| 297 Py_XDECREF(v); | |
| 298 PyDict_SetItemString(sysdict, "copyright", | |
| 299 v = PyString_FromString(Py_GetCopyright())); | |
| 300 Py_XDECREF(v); | |
| 301 PyDict_SetItemString(sysdict, "platform", | |
| 302 v = PyString_FromString(Py_GetPlatform())); | |
| 303 Py_XDECREF(v); | |
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304 PyDict_SetItemString(sysdict, "executable", |
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305 v = PyString_FromString(Py_GetProgramFullPath())); |
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306 Py_XDECREF(v); |
| 5372 | 307 PyDict_SetItemString(sysdict, "prefix", |
| 308 v = PyString_FromString(Py_GetPrefix())); | |
| 309 Py_XDECREF(v); | |
| 310 PyDict_SetItemString(sysdict, "exec_prefix", | |
| 311 v = PyString_FromString(Py_GetExecPrefix())); | |
| 312 Py_XDECREF(v); | |
| 313 PyDict_SetItemString(sysdict, "maxint", | |
| 314 v = PyInt_FromLong(PyInt_GetMax())); | |
| 315 Py_XDECREF(v); | |
| 316 PyDict_SetItemString(sysdict, "builtin_module_names", | |
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317 v = list_builtin_module_names()); |
| 5372 | 318 Py_XDECREF(v); |
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319 #ifdef MS_COREDLL |
| 5372 | 320 PyDict_SetItemString(sysdict, "dllhandle", |
| 321 v = PyInt_FromLong((int)PyWin_DLLhModule)); | |
| 322 Py_XDECREF(v); | |
| 323 PyDict_SetItemString(sysdict, "winver", | |
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324 v = PyString_FromString(PyWin_DLLVersionString)); |
| 5372 | 325 Py_XDECREF(v); |
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326 #endif |
| 5372 | 327 if (PyErr_Occurred()) |
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328 return NULL; |
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329 return m; |
| 86 | 330 } |
| 331 | |
| 5372 | 332 static PyObject * |
| 86 | 333 makepathobject(path, delim) |
| 334 char *path; | |
| 335 int delim; | |
| 336 { | |
| 337 int i, n; | |
| 338 char *p; | |
| 5372 | 339 PyObject *v, *w; |
| 6 | 340 |
| 86 | 341 n = 1; |
| 342 p = path; | |
| 343 while ((p = strchr(p, delim)) != NULL) { | |
| 344 n++; | |
| 345 p++; | |
| 346 } | |
| 5372 | 347 v = PyList_New(n); |
| 86 | 348 if (v == NULL) |
| 349 return NULL; | |
| 350 for (i = 0; ; i++) { | |
| 351 p = strchr(path, delim); | |
| 352 if (p == NULL) | |
| 353 p = strchr(path, '\0'); /* End of string */ | |
| 5372 | 354 w = PyString_FromStringAndSize(path, (int) (p - path)); |
| 86 | 355 if (w == NULL) { |
| 5372 | 356 Py_DECREF(v); |
| 86 | 357 return NULL; |
| 358 } | |
| 5372 | 359 PyList_SetItem(v, i, w); |
| 86 | 360 if (*p == '\0') |
| 361 break; | |
| 362 path = p+1; | |
| 363 } | |
| 364 return v; | |
| 365 } | |
| 366 | |
| 367 void | |
| 5372 | 368 PySys_SetPath(path) |
| 86 | 369 char *path; |
| 370 { | |
| 5372 | 371 PyObject *v; |
| 86 | 372 if ((v = makepathobject(path, DELIM)) == NULL) |
| 5372 | 373 Py_FatalError("can't create sys.path"); |
| 374 if (PySys_SetObject("path", v) != 0) | |
| 375 Py_FatalError("can't assign sys.path"); | |
| 376 Py_DECREF(v); | |
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377 } |
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378 |
| 5372 | 379 static PyObject * |
| 86 | 380 makeargvobject(argc, argv) |
| 381 int argc; | |
| 382 char **argv; | |
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383 { |
| 5372 | 384 PyObject *av; |
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385 if (argc <= 0 || argv == NULL) { |
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386 /* Ensure at least one (empty) argument is seen */ |
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387 static char *empty_argv[1] = {""}; |
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388 argv = empty_argv; |
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389 argc = 1; |
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390 } |
| 5372 | 391 av = PyList_New(argc); |
| 86 | 392 if (av != NULL) { |
| 393 int i; | |
| 394 for (i = 0; i < argc; i++) { | |
| 5372 | 395 PyObject *v = PyString_FromString(argv[i]); |
| 86 | 396 if (v == NULL) { |
| 5372 | 397 Py_DECREF(av); |
| 86 | 398 av = NULL; |
| 399 break; | |
| 400 } | |
| 5372 | 401 PyList_SetItem(av, i, v); |
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402 } |
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403 } |
| 86 | 404 return av; |
| 6 | 405 } |
| 406 | |
| 407 void | |
| 5372 | 408 PySys_SetArgv(argc, argv) |
| 86 | 409 int argc; |
| 410 char **argv; | |
| 6 | 411 { |
| 5372 | 412 PyObject *av = makeargvobject(argc, argv); |
| 413 PyObject *path = PySys_GetObject("path"); | |
| 86 | 414 if (av == NULL) |
| 5372 | 415 Py_FatalError("no mem for sys.argv"); |
| 416 if (PySys_SetObject("argv", av) != 0) | |
| 417 Py_FatalError("can't assign sys.argv"); | |
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418 if (path != NULL) { |
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419 char *argv0 = argv[0]; |
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420 char *p = NULL; |
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421 int n = 0; |
| 5372 | 422 PyObject *a; |
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423 #ifdef HAVE_READLINK |
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424 char link[MAXPATHLEN+1]; |
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425 char argv0copy[2*MAXPATHLEN+1]; |
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426 int nr = 0; |
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427 if (argc > 0 && argv0 != NULL) |
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428 nr = readlink(argv0, link, MAXPATHLEN); |
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429 if (nr > 0) { |
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430 /* It's a symlink */ |
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431 link[nr] = '\0'; |
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432 if (link[0] == SEP) |
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433 argv0 = link; /* Link to absolute path */ |
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434 else if (strchr(link, SEP) == NULL) |
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435 ; /* Link without path */ |
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436 else { |
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437 /* Must join(dirname(argv0), link) */ |
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438 char *q = strrchr(argv0, SEP); |
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439 if (q == NULL) |
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440 argv0 = link; /* argv0 without path */ |
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441 else { |
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442 /* Must make a copy */ |
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443 strcpy(argv0copy, argv0); |
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444 q = strrchr(argv0copy, SEP); |
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445 strcpy(q+1, link); |
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446 argv0 = argv0copy; |
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447 } |
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448 } |
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449 } |
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450 #endif /* HAVE_READLINK */ |
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451 #if SEP == '\\' /* Special case for MS filename syntax */ |
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452 if (argc > 0 && argv0 != NULL) { |
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453 char *q; |
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454 p = strrchr(argv0, SEP); |
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455 /* Test for alternate separator */ |
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456 q = strrchr(p ? p : argv0, '/'); |
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457 if (q != NULL) |
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458 p = q; |
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459 if (p != NULL) { |
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460 n = p + 1 - argv0; |
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461 if (n > 1 && p[-1] != ':') |
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462 n--; /* Drop trailing separator */ |
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463 } |
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464 } |
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465 #else /* All other filename syntaxes */ |
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466 if (argc > 0 && argv0 != NULL) |
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467 p = strrchr(argv0, SEP); |
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468 if (p != NULL) { |
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469 n = p + 1 - argv0; |
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470 #if SEP == '/' /* Special case for Unix filename syntax */ |
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471 if (n > 1) |
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472 n--; /* Drop trailing separator */ |
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473 #endif /* Unix */ |
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474 } |
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475 #endif /* All others */ |
| 5372 | 476 a = PyString_FromStringAndSize(argv0, n); |
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477 if (a == NULL) |
| 5372 | 478 Py_FatalError("no mem for sys.path insertion"); |
| 479 if (PyList_Insert(path, 0, a) < 0) | |
| 480 Py_FatalError("sys.path.insert(0) failed"); | |
| 481 Py_DECREF(a); | |
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482 } |
| 5372 | 483 Py_DECREF(av); |
| 6 | 484 } |