1 /****************************************************************************
2 * Copyright (c) 1998-2012,2013 Free Software Foundation, Inc. *
3 * *
4 * Permission is hereby granted, free of charge, to any person obtaining a *
5 * copy of this software and associated documentation files (the *
6 * "Software"), to deal in the Software without restriction, including *
7 * without limitation the rights to use, copy, modify, merge, publish, *
8 * distribute, distribute with modifications, sublicense, and/or sell *
9 * copies of the Software, and to permit persons to whom the Software is *
10 * furnished to do so, subject to the following conditions: *
11 * *
12 * The above copyright notice and this permission notice shall be included *
13 * in all copies or substantial portions of the Software. *
14 * *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
22 * *
23 * Except as contained in this notice, the name(s) of the above copyright *
24 * holders shall not be used in advertising or otherwise to promote the *
25 * sale, use or other dealings in this Software without prior written *
26 * authorization. *
27 ****************************************************************************/
28
29 /****************************************************************************
30 * Author: Zeyd M. Ben-Halim <[email protected]> 1992,1995 *
31 * and: Eric S. Raymond <[email protected]> *
32 * and: Thomas E. Dickey 1996-on *
33 * and: Juergen Pfeifer *
34 ****************************************************************************/
35
36 /*
37 ** lib_data.c
38 **
39 ** Common data that may/may not be allocated, but is referenced globally
40 **
41 */
42
43 #include <curses.priv.h>
44
45 MODULE_ID("$Id: lib_data.c,v 1.66 2013/08/24 17:28:24 tom Exp $")
46
47 /*
48 * OS/2's native linker complains if we don't initialize public data when
49 * constructing a dll (reported by J.J.G.Ripoll).
50 */
51 #if USE_REENTRANT
NCURSES_EXPORT(WINDOW *)52 NCURSES_EXPORT(WINDOW *)
53 NCURSES_PUBLIC_VAR(stdscr) (void)
54 {
55 return CURRENT_SCREEN ? StdScreen(CURRENT_SCREEN) : 0;
56 }
57 NCURSES_EXPORT(WINDOW *)
NCURSES_PUBLIC_VAR(curscr)58 NCURSES_PUBLIC_VAR(curscr) (void)
59 {
60 return CURRENT_SCREEN ? CurScreen(CURRENT_SCREEN) : 0;
61 }
62 NCURSES_EXPORT(WINDOW *)
NCURSES_PUBLIC_VAR(newscr)63 NCURSES_PUBLIC_VAR(newscr) (void)
64 {
65 return CURRENT_SCREEN ? NewScreen(CURRENT_SCREEN) : 0;
66 }
67 #else
68 NCURSES_EXPORT_VAR(WINDOW *) stdscr = 0;
69 NCURSES_EXPORT_VAR(WINDOW *) curscr = 0;
70 NCURSES_EXPORT_VAR(WINDOW *) newscr = 0;
71 #endif
72
73 NCURSES_EXPORT_VAR(SCREEN *) _nc_screen_chain = 0;
74
75 /*
76 * The variable 'SP' will be defined as a function on systems that cannot link
77 * data-only modules, since it is used in a lot of places within ncurses and we
78 * cannot guarantee that any application will use any particular function. We
79 * put the WINDOW variables in this module, because it appears that any
80 * application that uses them will also use 'SP'.
81 *
82 * This module intentionally does not reference other ncurses modules, to avoid
83 * module coupling that increases the size of the executable.
84 */
85 #if BROKEN_LINKER
86 static SCREEN *my_screen;
87
88 NCURSES_EXPORT(SCREEN *)
_nc_screen(void)89 _nc_screen(void)
90 {
91 return my_screen;
92 }
93
94 NCURSES_EXPORT(int)
_nc_alloc_screen(void)95 _nc_alloc_screen(void)
96 {
97 return ((my_screen = _nc_alloc_screen_sp()) != 0);
98 }
99
100 NCURSES_EXPORT(void)
_nc_set_screen(SCREEN * sp)101 _nc_set_screen(SCREEN *sp)
102 {
103 my_screen = sp;
104 }
105
106 #else
107
108 NCURSES_EXPORT_VAR(SCREEN *) SP = NULL; /* Some linkers require initialized data... */
109 #endif
110 /* *INDENT-OFF* */
111 #define CHARS_0s { '\0' }
112
113 #define TGETENT_0 { 0L, FALSE, NULL, NULL, NULL }
114 #define TGETENT_0s { TGETENT_0, TGETENT_0, TGETENT_0, TGETENT_0 }
115
116 NCURSES_EXPORT_VAR(NCURSES_GLOBALS) _nc_globals = {
117 0, /* have_sigtstp */
118 0, /* have_sigwinch */
119 0, /* cleanup_nested */
120
121 FALSE, /* init_signals */
122 FALSE, /* init_screen */
123
124 NULL, /* comp_sourcename */
125 NULL, /* comp_termtype */
126
127 FALSE, /* have_tic_directory */
128 FALSE, /* keep_tic_directory */
129 0, /* tic_directory */
130
131 NULL, /* dbi_list */
132 0, /* dbi_size */
133
134 NULL, /* first_name */
135 NULL, /* keyname_table */
136 0, /* init_keyname */
137
138 0, /* slk_format */
139
140 NULL, /* safeprint_buf */
141 0, /* safeprint_used */
142
143 TGETENT_0s, /* tgetent_cache */
144 0, /* tgetent_index */
145 0, /* tgetent_sequence */
146
147 0, /* dbd_blob */
148 0, /* dbd_list */
149 0, /* dbd_size */
150 0, /* dbd_time */
151 { { 0, 0 } }, /* dbd_vars */
152
153 #ifndef USE_SP_WINDOWLIST
154 0, /* _nc_windowlist */
155 #endif
156
157 #if USE_HOME_TERMINFO
158 NULL, /* home_terminfo */
159 #endif
160
161 #if !USE_SAFE_SPRINTF
162 0, /* safeprint_cols */
163 0, /* safeprint_rows */
164 #endif
165
166 #ifdef USE_TERM_DRIVER
167 0, /* term_driver */
168 #endif
169
170 #ifdef TRACE
171 FALSE, /* init_trace */
172 CHARS_0s, /* trace_fname */
173 0, /* trace_level */
174 NULL, /* trace_fp */
175
176 NULL, /* tracearg_buf */
177 0, /* tracearg_used */
178
179 NULL, /* tracebuf_ptr */
180 0, /* tracebuf_used */
181
182 CHARS_0s, /* tracechr_buf */
183
184 NULL, /* tracedmp_buf */
185 0, /* tracedmp_used */
186
187 NULL, /* tracetry_buf */
188 0, /* tracetry_used */
189
190 { CHARS_0s, CHARS_0s }, /* traceatr_color_buf */
191 0, /* traceatr_color_sel */
192 -1, /* traceatr_color_last */
193 #if !defined(USE_PTHREADS) && USE_REENTRANT
194 0, /* nested_tracef */
195 #endif
196 #endif /* TRACE */
197 #ifdef USE_PTHREADS
198 PTHREAD_MUTEX_INITIALIZER, /* mutex_curses */
199 PTHREAD_MUTEX_INITIALIZER, /* mutex_tst_tracef */
200 PTHREAD_MUTEX_INITIALIZER, /* mutex_tracef */
201 0, /* nested_tracef */
202 0, /* use_pthreads */
203 #endif
204 #if USE_PTHREADS_EINTR
205 0, /* read_thread */
206 #endif
207 };
208
209 #define STACK_FRAME_0 { { 0 }, 0 }
210 #define STACK_FRAME_0s { STACK_FRAME_0 }
211 #define NUM_VARS_0s { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 }
212
213 #define RIPOFF_0 { 0,0,0 }
214 #define RIPOFF_0s { RIPOFF_0 }
215
216 NCURSES_EXPORT_VAR(NCURSES_PRESCREEN) _nc_prescreen = {
217 TRUE, /* use_env */
218 FALSE, /* filter_mode */
219 A_NORMAL, /* previous_attr */
220 #ifndef USE_SP_RIPOFF
221 RIPOFF_0s, /* ripoff */
222 NULL, /* rsp */
223 #endif
224 { /* tparm_state */
225 #ifdef TRACE
226 NULL, /* tname */
227 #endif
228 NULL, /* tparam_base */
229
230 STACK_FRAME_0s, /* stack */
231 0, /* stack_ptr */
232
233 NULL, /* out_buff */
234 0, /* out_size */
235 0, /* out_used */
236
237 NULL, /* fmt_buff */
238 0, /* fmt_size */
239
240 NUM_VARS_0s, /* dynamic_var */
241 NUM_VARS_0s, /* static_vars */
242 },
243 NULL, /* saved_tty */
244 #if NCURSES_NO_PADDING
245 FALSE, /* flag to set if padding disabled */
246 #endif
247 0, /* _outch */
248 #if BROKEN_LINKER || USE_REENTRANT
249 NULL, /* real_acs_map */
250 0, /* LINES */
251 0, /* COLS */
252 8, /* TABSIZE */
253 1000, /* ESCDELAY */
254 0, /* cur_term */
255 #ifdef TRACE
256 0L, /* _outchars */
257 NULL, /* _tputs_trace */
258 #endif
259 #endif
260 FALSE, /* use_tioctl */
261 };
262 /* *INDENT-ON* */
263
264 /*
265 * wgetch() and other functions with a WINDOW* parameter may use a SCREEN*
266 * internally, and it is useful to allow those to be invoked without switching
267 * SCREEN's, e.g., for multi-threaded applications.
268 */
269 NCURSES_EXPORT(SCREEN *)
_nc_screen_of(WINDOW * win)270 _nc_screen_of(WINDOW *win)
271 {
272 SCREEN *sp = 0;
273
274 if (win != 0) {
275 sp = WINDOW_EXT(win, screen);
276 }
277 return (sp);
278 }
279
280 /******************************************************************************/
281 #ifdef USE_PTHREADS
282 static void
init_global_mutexes(void)283 init_global_mutexes(void)
284 {
285 static bool initialized = FALSE;
286
287 if (!initialized) {
288 initialized = TRUE;
289 _nc_mutex_init(&_nc_globals.mutex_curses);
290 _nc_mutex_init(&_nc_globals.mutex_tst_tracef);
291 _nc_mutex_init(&_nc_globals.mutex_tracef);
292 }
293 }
294
295 NCURSES_EXPORT(void)
_nc_init_pthreads(void)296 _nc_init_pthreads(void)
297 {
298 if (_nc_use_pthreads)
299 return;
300 # if USE_WEAK_SYMBOLS
301 if ((pthread_mutex_init) == 0)
302 return;
303 if ((pthread_mutex_lock) == 0)
304 return;
305 if ((pthread_mutex_unlock) == 0)
306 return;
307 if ((pthread_mutex_trylock) == 0)
308 return;
309 if ((pthread_mutexattr_settype) == 0)
310 return;
311 # endif
312 _nc_use_pthreads = 1;
313 init_global_mutexes();
314 }
315
316 /*
317 * Use recursive mutexes if we have them - they're part of Unix98.
318 * For the cases where we do not, _nc_mutex_trylock() is used to avoid a
319 * deadlock, at the expense of memory leaks and unexpected failures that
320 * may not be handled by typical clients.
321 *
322 * FIXME - need configure check for PTHREAD_MUTEX_RECURSIVE, define it to
323 * PTHREAD_MUTEX_NORMAL if not supported.
324 */
325 NCURSES_EXPORT(void)
_nc_mutex_init(pthread_mutex_t * obj)326 _nc_mutex_init(pthread_mutex_t * obj)
327 {
328 pthread_mutexattr_t recattr;
329
330 if (_nc_use_pthreads) {
331 pthread_mutexattr_init(&recattr);
332 pthread_mutexattr_settype(&recattr, PTHREAD_MUTEX_RECURSIVE);
333 pthread_mutex_init(obj, &recattr);
334 }
335 }
336
337 NCURSES_EXPORT(int)
_nc_mutex_lock(pthread_mutex_t * obj)338 _nc_mutex_lock(pthread_mutex_t * obj)
339 {
340 if (_nc_use_pthreads == 0)
341 return 0;
342 return pthread_mutex_lock(obj);
343 }
344
345 NCURSES_EXPORT(int)
_nc_mutex_trylock(pthread_mutex_t * obj)346 _nc_mutex_trylock(pthread_mutex_t * obj)
347 {
348 if (_nc_use_pthreads == 0)
349 return 0;
350 return pthread_mutex_trylock(obj);
351 }
352
353 NCURSES_EXPORT(int)
_nc_mutex_unlock(pthread_mutex_t * obj)354 _nc_mutex_unlock(pthread_mutex_t * obj)
355 {
356 if (_nc_use_pthreads == 0)
357 return 0;
358 return pthread_mutex_unlock(obj);
359 }
360 #endif /* USE_PTHREADS */
361
362 #if defined(USE_PTHREADS) || USE_PTHREADS_EINTR
363 #if USE_WEAK_SYMBOLS
364 /*
365 * NB: sigprocmask(2) is global but pthread_sigmask(3p)
366 * only for the calling thread.
367 */
368 NCURSES_EXPORT(int)
_nc_sigprocmask(int how,const sigset_t * newmask,sigset_t * oldmask)369 _nc_sigprocmask(int how, const sigset_t * newmask, sigset_t * oldmask)
370 {
371 if ((pthread_sigmask))
372 return pthread_sigmask(how, newmask, oldmask);
373 else
374 return sigprocmask(how, newmask, oldmask);
375 }
376 #endif
377 #endif /* USE_PTHREADS */
378