1 /****************************************************************************
2 * Copyright (c) 1998-2011,2012 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 1.65 2012/08/25 18:38:43 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_sigtstp */
118 0, /* have_sigwinch */
119 0, /* cleanup_nested */
121 FALSE, /* init_signals */
122 FALSE, /* init_screen */
124 NULL, /* comp_sourcename */
125 NULL, /* comp_termtype */
127 FALSE, /* have_tic_directory */
128 FALSE, /* keep_tic_directory */
129 0, /* tic_directory */
134 NULL, /* first_name */
135 NULL, /* keyname_table */
139 NULL, /* safeprint_buf */
140 0, /* safeprint_used */
142 TGETENT_0s, /* tgetent_cache */
143 0, /* tgetent_index */
144 0, /* tgetent_sequence */
150 { { 0, 0 } }, /* dbd_vars */
152 #ifndef USE_SP_WINDOWLIST
153 0, /* _nc_windowlist */
156 #if USE_HOME_TERMINFO
157 NULL, /* home_terminfo */
160 #if !USE_SAFE_SPRINTF
161 0, /* safeprint_cols */
162 0, /* safeprint_rows */
165 #ifdef USE_TERM_DRIVER
170 FALSE, /* init_trace */
171 CHARS_0s, /* trace_fname */
175 NULL, /* tracearg_buf */
176 0, /* tracearg_used */
178 NULL, /* tracebuf_ptr */
179 0, /* tracebuf_used */
181 CHARS_0s, /* tracechr_buf */
183 NULL, /* tracedmp_buf */
184 0, /* tracedmp_used */
186 NULL, /* tracetry_buf */
187 0, /* tracetry_used */
189 { CHARS_0s, CHARS_0s }, /* traceatr_color_buf */
190 0, /* traceatr_color_sel */
191 -1, /* traceatr_color_last */
192 #if !defined(USE_PTHREADS) && USE_REENTRANT
193 0, /* nested_tracef */
197 PTHREAD_MUTEX_INITIALIZER, /* mutex_curses */
198 PTHREAD_MUTEX_INITIALIZER, /* mutex_tst_tracef */
199 PTHREAD_MUTEX_INITIALIZER, /* mutex_tracef */
200 0, /* nested_tracef */
201 0, /* use_pthreads */
203 #if USE_PTHREADS_EINTR
208 #define STACK_FRAME_0 { { 0 }, 0 }
209 #define STACK_FRAME_0s { STACK_FRAME_0 }
210 #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 #define RIPOFF_0 { 0,0,0 }
213 #define RIPOFF_0s { RIPOFF_0 }
215 NCURSES_EXPORT_VAR(NCURSES_PRESCREEN) _nc_prescreen = {
217 FALSE, /* filter_mode */
218 A_NORMAL, /* previous_attr */
219 #ifndef USE_SP_RIPOFF
220 RIPOFF_0s, /* ripoff */
227 NULL, /* tparam_base */
229 STACK_FRAME_0s, /* stack */
239 NUM_VARS_0s, /* dynamic_var */
240 NUM_VARS_0s, /* static_vars */
242 NULL, /* saved_tty */
243 #if NCURSES_NO_PADDING
244 FALSE, /* flag to set if padding disabled */
247 #if BROKEN_LINKER || USE_REENTRANT
248 NULL, /* real_acs_map */
256 NULL, /* _tputs_trace */
259 FALSE, /* use_tioctl */
264 * wgetch() and other functions with a WINDOW* parameter may use a SCREEN*
265 * internally, and it is useful to allow those to be invoked without switching
266 * SCREEN's, e.g., for multi-threaded applications.
268 NCURSES_EXPORT(SCREEN *)
269 _nc_screen_of(WINDOW *win)
274 sp = WINDOW_EXT(win, screen);
279 /******************************************************************************/
282 init_global_mutexes(void)
284 static bool initialized = FALSE;
288 _nc_mutex_init(&_nc_globals.mutex_curses);
289 _nc_mutex_init(&_nc_globals.mutex_tst_tracef);
290 _nc_mutex_init(&_nc_globals.mutex_tracef);
295 _nc_init_pthreads(void)
297 if (_nc_use_pthreads)
299 # if USE_WEAK_SYMBOLS
300 if ((pthread_mutex_init) == 0)
302 if ((pthread_mutex_lock) == 0)
304 if ((pthread_mutex_unlock) == 0)
306 if ((pthread_mutex_trylock) == 0)
308 if ((pthread_mutexattr_settype) == 0)
311 _nc_use_pthreads = 1;
312 init_global_mutexes();
316 * Use recursive mutexes if we have them - they're part of Unix98.
317 * For the cases where we do not, _nc_mutex_trylock() is used to avoid a
318 * deadlock, at the expense of memory leaks and unexpected failures that
319 * may not be handled by typical clients.
321 * FIXME - need configure check for PTHREAD_MUTEX_RECURSIVE, define it to
322 * PTHREAD_MUTEX_NORMAL if not supported.
325 _nc_mutex_init(pthread_mutex_t * obj)
327 pthread_mutexattr_t recattr;
329 if (_nc_use_pthreads) {
330 pthread_mutexattr_init(&recattr);
331 pthread_mutexattr_settype(&recattr, PTHREAD_MUTEX_RECURSIVE);
332 pthread_mutex_init(obj, &recattr);
337 _nc_mutex_lock(pthread_mutex_t * obj)
339 if (_nc_use_pthreads == 0)
341 return pthread_mutex_lock(obj);
345 _nc_mutex_trylock(pthread_mutex_t * obj)
347 if (_nc_use_pthreads == 0)
349 return pthread_mutex_trylock(obj);
353 _nc_mutex_unlock(pthread_mutex_t * obj)
355 if (_nc_use_pthreads == 0)
357 return pthread_mutex_unlock(obj);
359 #endif /* USE_PTHREADS */
361 #if defined(USE_PTHREADS) || USE_PTHREADS_EINTR
364 * NB: sigprocmask(2) is global but pthread_sigmask(3p)
365 * only for the calling thread.
368 _nc_sigprocmask(int how, const sigset_t * newmask, sigset_t * oldmask)
370 if ((pthread_sigmask))
371 return pthread_sigmask(how, newmask, oldmask);
373 return sigprocmask(how, newmask, oldmask);
376 #endif /* USE_PTHREADS */