1 /****************************************************************************
2 * Copyright (c) 1998-2008,2009 Free Software Foundation, Inc. *
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: *
12 * The above copyright notice and this permission notice shall be included *
13 * in all copies or substantial portions of the Software. *
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. *
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 *
27 ****************************************************************************/
29 /****************************************************************************
30 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
31 * and: Eric S. Raymond <esr@snark.thyrsus.com> *
32 * and: Thomas E. Dickey 1996-on *
33 * and: Juergen Pfeifer *
34 ****************************************************************************/
39 ** Common data that may/may not be allocated, but is referenced globally
43 #include <curses.priv.h>
45 MODULE_ID("$Id: lib_data.c,v 1.55 2009/06/07 14:48:25 tom Exp $")
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).
52 NCURSES_EXPORT(WINDOW *)
53 NCURSES_PUBLIC_VAR(stdscr) (void)
55 return CURRENT_SCREEN ? StdScreen(CURRENT_SCREEN) : 0;
57 NCURSES_EXPORT(WINDOW *)
58 NCURSES_PUBLIC_VAR(curscr) (void)
60 return CURRENT_SCREEN ? CurScreen(CURRENT_SCREEN) : 0;
62 NCURSES_EXPORT(WINDOW *)
63 NCURSES_PUBLIC_VAR(newscr) (void)
65 return CURRENT_SCREEN ? NewScreen(CURRENT_SCREEN) : 0;
68 NCURSES_EXPORT_VAR(WINDOW *) stdscr = 0;
69 NCURSES_EXPORT_VAR(WINDOW *) curscr = 0;
70 NCURSES_EXPORT_VAR(WINDOW *) newscr = 0;
73 NCURSES_EXPORT_VAR(SCREEN *) _nc_screen_chain = 0;
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'.
82 * This module intentionally does not reference other ncurses modules, to avoid
83 * module coupling that increases the size of the executable.
86 static SCREEN *my_screen;
88 NCURSES_EXPORT(SCREEN *)
95 _nc_alloc_screen(void)
97 return ((my_screen = _nc_alloc_screen_sp()) != 0);
101 _nc_set_screen(SCREEN *sp)
108 NCURSES_EXPORT_VAR(SCREEN *) SP = NULL; /* Some linkers require initialized data... */
111 #define CHARS_0s { '\0' }
113 #define TGETENT_0 { 0L, FALSE, NULL, NULL, NULL }
114 #define TGETENT_0s { TGETENT_0, TGETENT_0, TGETENT_0, TGETENT_0 }
116 NCURSES_EXPORT_VAR(NCURSES_GLOBALS) _nc_globals = {
117 0, /* have_sigwinch */
118 0, /* cleanup_nested */
120 FALSE, /* init_signals */
121 FALSE, /* init_screen */
123 NULL, /* comp_sourcename */
124 NULL, /* comp_termtype */
126 FALSE, /* have_tic_directory */
127 FALSE, /* keep_tic_directory */
128 TERMINFO, /* tic_directory */
133 NULL, /* first_name */
134 NULL, /* keyname_table */
138 NULL, /* safeprint_buf */
139 0, /* safeprint_used */
141 TGETENT_0s, /* tgetent_cache */
142 0, /* tgetent_index */
143 0, /* tgetent_sequence */
145 #ifndef USE_SP_WINDOWLIST
146 0, /* _nc_windowlist */
149 #if USE_HOME_TERMINFO
150 NULL, /* home_terminfo */
153 #if !USE_SAFE_SPRINTF
154 0, /* safeprint_cols */
155 0, /* safeprint_rows */
159 FALSE, /* init_trace */
160 CHARS_0s, /* trace_fname */
164 NULL, /* tracearg_buf */
165 0, /* tracearg_used */
167 NULL, /* tracebuf_ptr */
168 0, /* tracebuf_used */
170 CHARS_0s, /* tracechr_buf */
172 NULL, /* tracedmp_buf */
173 0, /* tracedmp_used */
175 NULL, /* tracetry_buf */
176 0, /* tracetry_used */
178 { CHARS_0s, CHARS_0s }, /* traceatr_color_buf */
179 0, /* traceatr_color_sel */
180 -1, /* traceatr_color_last */
181 #if !defined(USE_PTHREADS) && USE_REENTRANT
182 0, /* nested_tracef */
186 PTHREAD_MUTEX_INITIALIZER, /* mutex_curses */
187 PTHREAD_MUTEX_INITIALIZER, /* mutex_tst_tracef */
188 PTHREAD_MUTEX_INITIALIZER, /* mutex_tracef */
189 0, /* nested_tracef */
190 0, /* use_pthreads */
194 #define STACK_FRAME_0 { { 0 }, 0 }
195 #define STACK_FRAME_0s { STACK_FRAME_0 }
196 #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 }
198 #define RIPOFF_0 { 0,0,0 }
199 #define RIPOFF_0s { RIPOFF_0 }
201 NCURSES_EXPORT_VAR(NCURSES_PRESCREEN) _nc_prescreen = {
203 FALSE, /* filter_mode */
204 A_NORMAL, /* previous_attr */
205 #ifndef USE_SP_RIPOFF
206 RIPOFF_0s, /* ripoff */
213 NULL, /* tparam_base */
215 STACK_FRAME_0s, /* stack */
225 NUM_VARS_0s, /* dynamic_var */
226 NUM_VARS_0s, /* static_vars */
228 NULL, /* saved_tty */
229 #if NCURSES_NO_PADDING
230 FALSE, /* flag to set if padding disabled */
232 #if BROKEN_LINKER || USE_REENTRANT
233 NULL, /* real_acs_map */
241 NULL, /* _tputs_trace */
248 * wgetch() and other functions with a WINDOW* parameter may use a SCREEN*
249 * internally, and it is useful to allow those to be invoked without switching
250 * SCREEN's, e.g., for multi-threaded applications.
252 NCURSES_EXPORT(SCREEN *)
253 _nc_screen_of(WINDOW *win)
258 WINDOWLIST *wp = (WINDOWLIST *) win;
264 /******************************************************************************/
267 init_global_mutexes(void)
269 static bool initialized = FALSE;
273 _nc_mutex_init(&_nc_globals.mutex_curses);
274 _nc_mutex_init(&_nc_globals.mutex_tst_tracef);
275 _nc_mutex_init(&_nc_globals.mutex_tracef);
280 _nc_init_pthreads(void)
282 if (_nc_use_pthreads)
284 # if USE_WEAK_SYMBOLS
285 if ((pthread_mutex_init) == 0)
287 if ((pthread_mutex_lock) == 0)
289 if ((pthread_mutex_unlock) == 0)
291 if ((pthread_mutex_trylock) == 0)
293 if ((pthread_mutexattr_settype) == 0)
296 _nc_use_pthreads = 1;
297 init_global_mutexes();
301 * Use recursive mutexes if we have them - they're part of Unix98.
302 * For the cases where we do not, _nc_mutex_trylock() is used to avoid a
303 * deadlock, at the expense of memory leaks and unexpected failures that
304 * may not be handled by typical clients.
306 * FIXME - need configure check for PTHREAD_MUTEX_RECURSIVE, define it to
307 * PTHREAD_MUTEX_NORMAL if not supported.
310 _nc_mutex_init(pthread_mutex_t * obj)
312 pthread_mutexattr_t recattr;
314 if (_nc_use_pthreads) {
315 pthread_mutexattr_init(&recattr);
316 pthread_mutexattr_settype(&recattr, PTHREAD_MUTEX_RECURSIVE);
317 pthread_mutex_init(obj, &recattr);
322 _nc_mutex_lock(pthread_mutex_t * obj)
324 if (_nc_use_pthreads == 0)
326 return pthread_mutex_lock(obj);
330 _nc_mutex_trylock(pthread_mutex_t * obj)
332 if (_nc_use_pthreads == 0)
334 return pthread_mutex_trylock(obj);
338 _nc_mutex_unlock(pthread_mutex_t * obj)
340 if (_nc_use_pthreads == 0)
342 return pthread_mutex_unlock(obj);
347 * NB: sigprocmask(2) is global but pthread_sigmask(3p)
348 * only for the calling thread.
351 _nc_sigprocmask(int how, const sigset_t * newmask, sigset_t * oldmask)
353 if ((pthread_sigmask))
354 return pthread_sigmask(how, newmask, oldmask);
356 return sigprocmask(how, newmask, oldmask);
359 #endif /* USE_PTHREADS */