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comparison: util-src/signal.c

util-src/signal.c

changeset 2317
aa58136622bc
parent 1841
0dc1daa94e7f
child 2343
4b05fd561cbd
equal deleted inserted replaced
2316:049cebba35bf 2317:aa58136622bc
1 /*
2 * lsignal.h -- Signal Handler Library for Lua
3 *
4 * Version: 1.000
5 *
6 * Copyright (C) 2007 Patrick J. Donnelly (batrick@unm.edu)
7 *
8 * This software is distributed under the same license as Lua 5.0:
9 *
10 * Permission is hereby granted, free of charge, to any person obtaining a
11 * copy of this software and associated documentation files (the "Software"),
12 * to deal in the Software without restriction, including without limitation
13 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
14 * and/or sell copies of the Software, and to permit persons to whom the
15 * Software is furnished to do so, subject to the following conditions:
16 *
17 * The above copyright notice and this permission notice shall be included
18 * in all copies or substantial portions of the Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
21 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
24 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
26 * OTHER DEALINGS IN THE SOFTWARE.
27 */
28
29 #include <signal.h>
30
31 #include "lua.h"
32 #include "lauxlib.h"
33
34 #ifndef lsig
35
36 #define lsig
37
38 struct lua_signal
39 {
40 char *name; /* name of the signal */
41 int sig; /* the signal */
42 };
43
44 #endif
45
46 #define LUA_SIGNAL "lua_signal"
47
48 static const struct lua_signal lua_signals[] = {
49 /* ANSI C signals */
50 #ifdef SIGABRT
51 {"SIGABRT", SIGABRT},
52 #endif
53 #ifdef SIGFPE
54 {"SIGFPE", SIGFPE},
55 #endif
56 #ifdef SIGILL
57 {"SIGILL", SIGILL},
58 #endif
59 #ifdef SIGINT
60 {"SIGINT", SIGINT},
61 #endif
62 #ifdef SIGSEGV
63 {"SIGSEGV", SIGSEGV},
64 #endif
65 #ifdef SIGTERM
66 {"SIGTERM", SIGTERM},
67 #endif
68 /* posix signals */
69 #ifdef SIGHUP
70 {"SIGHUP", SIGHUP},
71 #endif
72 #ifdef SIGQUIT
73 {"SIGQUIT", SIGQUIT},
74 #endif
75 #ifdef SIGTRAP
76 {"SIGTRAP", SIGTRAP},
77 #endif
78 #ifdef SIGKILL
79 {"SIGKILL", SIGKILL},
80 #endif
81 #ifdef SIGUSR1
82 {"SIGUSR1", SIGUSR1},
83 #endif
84 #ifdef SIGUSR2
85 {"SIGUSR2", SIGUSR2},
86 #endif
87 #ifdef SIGPIPE
88 {"SIGPIPE", SIGPIPE},
89 #endif
90 #ifdef SIGALRM
91 {"SIGALRM", SIGALRM},
92 #endif
93 #ifdef SIGCHLD
94 {"SIGCHLD", SIGCHLD},
95 #endif
96 #ifdef SIGCONT
97 {"SIGCONT", SIGCONT},
98 #endif
99 #ifdef SIGSTOP
100 {"SIGSTOP", SIGSTOP},
101 #endif
102 #ifdef SIGTTIN
103 {"SIGTTIN", SIGTTIN},
104 #endif
105 #ifdef SIGTTOU
106 {"SIGTTOU", SIGTTOU},
107 #endif
108 /* some BSD signals */
109 #ifdef SIGIOT
110 {"SIGIOT", SIGIOT},
111 #endif
112 #ifdef SIGBUS
113 {"SIGBUS", SIGBUS},
114 #endif
115 #ifdef SIGCLD
116 {"SIGCLD", SIGCLD},
117 #endif
118 #ifdef SIGURG
119 {"SIGURG", SIGURG},
120 #endif
121 #ifdef SIGXCPU
122 {"SIGXCPU", SIGXCPU},
123 #endif
124 #ifdef SIGXFSZ
125 {"SIGXFSZ", SIGXFSZ},
126 #endif
127 #ifdef SIGVTALRM
128 {"SIGVTALRM", SIGVTALRM},
129 #endif
130 #ifdef SIGPROF
131 {"SIGPROF", SIGPROF},
132 #endif
133 #ifdef SIGWINCH
134 {"SIGWINCH", SIGWINCH},
135 #endif
136 #ifdef SIGPOLL
137 {"SIGPOLL", SIGPOLL},
138 #endif
139 #ifdef SIGIO
140 {"SIGIO", SIGIO},
141 #endif
142 /* add odd signals */
143 #ifdef SIGSTKFLT
144 {"SIGSTKFLT", SIGSTKFLT}, /* stack fault */
145 #endif
146 #ifdef SIGSYS
147 {"SIGSYS", SIGSYS},
148 #endif
149 {NULL, 0}
150 };
151
152 static int Nsig = 0;
153 static lua_State *Lsig = NULL;
154 static lua_Hook Hsig = NULL;
155 static int Hmask = 0;
156 static int Hcount = 0;
157
158 static void sighook(lua_State *L, lua_Debug *ar)
159 {
160 lua_pushstring(L, LUA_SIGNAL);
161 lua_gettable(L, LUA_REGISTRYINDEX);
162 lua_pushnumber(L, Nsig);
163 lua_gettable(L, -2);
164
165 lua_call(L, 0, 0);
166
167 /* set the old hook */
168 lua_sethook(L, Hsig, Hmask, Hcount);
169 }
170
171 static void handle(int sig)
172 {
173 Hsig = lua_gethook(Lsig);
174 Hmask = lua_gethookmask(Lsig);
175 Hcount = lua_gethookcount(Lsig);
176 Nsig = sig;
177
178 lua_sethook(Lsig, sighook, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
179 /*
180 switch (sig)
181 {
182 case SIGABRT: ;
183 case SIGFPE: ;
184 case SIGILL: ;
185 case SIGINT: ;
186 case SIGSEGV: ;
187 case SIGTERM: ;
188 } */
189 }
190
191 /*
192 * l_signal == signal(signal [, func [, chook]])
193 *
194 * signal = signal number or string
195 * func = Lua function to call
196 * chook = catch within C functions
197 * if caught, Lua function _must_
198 * exit, as the stack is most likely
199 * in an unstable state.
200 */
201
202 static int l_signal(lua_State *L)
203 {
204 int args = lua_gettop(L);
205 int t, sig; /* type, signal */
206
207 /* get type of signal */
208 luaL_checkany(L, 1);
209 t = lua_type(L, 1);
210 if (t == LUA_TNUMBER)
211 sig = (int) lua_tonumber(L, 1);
212 else if (t == LUA_TSTRING)
213 {
214 lua_pushstring(L, LUA_SIGNAL);
215 lua_gettable(L, LUA_REGISTRYINDEX);
216 lua_pushvalue(L, 1);
217 lua_gettable(L, -2);
218 if (!lua_isnumber(L, -1))
219 luaL_error(L, "invalid signal string");
220 sig = (int) lua_tonumber(L, -1);
221 lua_pop(L, 1); /* get rid of number we pushed */
222 } else
223 luaL_checknumber(L, 1); /* will always error, with good error msg */
224
225 /* set handler */
226 if (args == 1 || lua_isnil(L, 2)) /* clear handler */
227 {
228 lua_pushstring(L, LUA_SIGNAL);
229 lua_gettable(L, LUA_REGISTRYINDEX);
230 lua_pushnumber(L, sig);
231 lua_gettable(L, -2); /* return old handler */
232 lua_pushnumber(L, sig);
233 lua_pushnil(L);
234 lua_settable(L, -4);
235 lua_remove(L, -2); /* remove LUA_SIGNAL table */
236 signal(sig, SIG_DFL);
237 } else
238 {
239 luaL_checktype(L, 2, LUA_TFUNCTION);
240
241 lua_pushstring(L, LUA_SIGNAL);
242 lua_gettable(L, LUA_REGISTRYINDEX);
243
244 lua_pushnumber(L, sig);
245 lua_pushvalue(L, 2);
246 lua_settable(L, -3);
247
248 /* Set the state for the handler */
249 Lsig = L;
250
251 if (lua_toboolean(L, 3)) /* c hook? */
252 {
253 if (signal(sig, handle) == SIG_ERR)
254 lua_pushboolean(L, 0);
255 else
256 lua_pushboolean(L, 1);
257 } else /* lua_hook */
258 {
259 if (signal(sig, handle) == SIG_ERR)
260 lua_pushboolean(L, 0);
261 else
262 lua_pushboolean(L, 1);
263 }
264 }
265 return 1;
266 }
267
268 /*
269 * l_raise == raise(signal)
270 *
271 * signal = signal number or string
272 */
273
274 static int l_raise(lua_State *L)
275 {
276 /* int args = lua_gettop(L); */
277 int t = 0; /* type */
278 lua_Number ret;
279
280 luaL_checkany(L, 1);
281
282 t = lua_type(L, 1);
283 if (t == LUA_TNUMBER)
284 {
285 ret = (lua_Number) raise((int) lua_tonumber(L, 1));
286 lua_pushnumber(L, ret);
287 } else if (t == LUA_TSTRING)
288 {
289 lua_pushstring(L, LUA_SIGNAL);
290 lua_gettable(L, LUA_REGISTRYINDEX);
291 lua_pushvalue(L, 1);
292 lua_gettable(L, -2);
293 if (!lua_isnumber(L, -1))
294 luaL_error(L, "invalid signal string");
295 ret = (lua_Number) raise((int) lua_tonumber(L, -1));
296 lua_pop(L, 1); /* get rid of number we pushed */
297 lua_pushnumber(L, ret);
298 } else
299 luaL_checknumber(L, 1); /* will always error, with good error msg */
300
301 return 1;
302 }
303
304 #if defined _POSIX_SOURCE || (defined(sun) || defined(__sun))
305
306 /* define some posix only functions */
307
308 /*
309 * l_kill == kill(pid, signal)
310 *
311 * pid = process id
312 * signal = signal number or string
313 */
314
315 static int l_kill(lua_State *L)
316 {
317 int t; /* type */
318 lua_Number ret; /* return value */
319
320 luaL_checknumber(L, 1); /* must be int for pid */
321 luaL_checkany(L, 2); /* check for a second arg */
322
323 t = lua_type(L, 2);
324 if (t == LUA_TNUMBER)
325 {
326 ret = (lua_Number) kill((int) lua_tonumber(L, 1),
327 (int) lua_tonumber(L, 2));
328 lua_pushnumber(L, ret);
329 } else if (t == LUA_TSTRING)
330 {
331 lua_pushstring(L, LUA_SIGNAL);
332 lua_gettable(L, LUA_REGISTRYINDEX);
333 lua_pushvalue(L, 2);
334 lua_gettable(L, -2);
335 if (!lua_isnumber(L, -1))
336 luaL_error(L, "invalid signal string");
337 ret = (lua_Number) kill((int) lua_tonumber(L, 1),
338 (int) lua_tonumber(L, -1));
339 lua_pop(L, 1); /* get rid of number we pushed */
340 lua_pushnumber(L, ret);
341 } else
342 luaL_checknumber(L, 2); /* will always error, with good error msg */
343 return 1;
344 }
345
346 #endif
347
348 static const struct luaL_Reg lsignal_lib[] = {
349 {"signal", l_signal},
350 {"raise", l_raise},
351 #ifdef _POSIX_SOURCE
352 {"kill", l_kill},
353 #endif
354 {NULL, NULL}
355 };
356
357 int luaopen_util_signal(lua_State *L)
358 {
359 int i = 0;
360
361 /* add the library */
362 luaL_register(L, "signal", lsignal_lib);
363
364 /* push lua_signals table into the registry */
365 /* put the signals inside the library table too,
366 * they are only a reference */
367 lua_pushstring(L, LUA_SIGNAL);
368 lua_createtable(L, 0, 0);
369
370 while (lua_signals[i].name != NULL)
371 {
372 /* registry table */
373 lua_pushstring(L, lua_signals[i].name);
374 lua_pushnumber(L, lua_signals[i].sig);
375 lua_settable(L, -3);
376 /* signal table */
377 lua_pushstring(L, lua_signals[i].name);
378 lua_pushnumber(L, lua_signals[i].sig);
379 lua_settable(L, -5);
380 i++;
381 }
382
383 /* add newtable to the registry */
384 lua_settable(L, LUA_REGISTRYINDEX);
385
386 return 1;
387 }

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