1 /****************************************************************************
2 * Copyright (c) 1998-2007,2008 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 ****************************************************************************/
38 ** Common data that may/may not be allocated, but is referenced globally
42 #include <curses.priv.h>
44 MODULE_ID("$Id: lib_data.c,v 1.52 2008/08/23 22:16:15 tom Exp $")
47 * OS/2's native linker complains if we don't initialize public data when
48 * constructing a dll (reported by J.J.G.Ripoll).
51 NCURSES_EXPORT(WINDOW *)
52 NCURSES_PUBLIC_VAR(stdscr) (void)
54 return SP ? SP->_stdscr : 0;
56 NCURSES_EXPORT(WINDOW *)
57 NCURSES_PUBLIC_VAR(curscr) (void)
59 return SP ? SP->_curscr : 0;
61 NCURSES_EXPORT(WINDOW *)
62 NCURSES_PUBLIC_VAR(newscr) (void)
64 return SP ? SP->_newscr : 0;
67 NCURSES_EXPORT_VAR(WINDOW *) stdscr = 0;
68 NCURSES_EXPORT_VAR(WINDOW *) curscr = 0;
69 NCURSES_EXPORT_VAR(WINDOW *) newscr = 0;
72 NCURSES_EXPORT_VAR(SCREEN *) _nc_screen_chain = 0;
75 * The variable 'SP' will be defined as a function on systems that cannot link
76 * data-only modules, since it is used in a lot of places within ncurses and we
77 * cannot guarantee that any application will use any particular function. We
78 * put the WINDOW variables in this module, because it appears that any
79 * application that uses them will also use 'SP'.
81 * This module intentionally does not reference other ncurses modules, to avoid
82 * module coupling that increases the size of the executable.
85 static SCREEN *my_screen;
87 NCURSES_EXPORT(SCREEN *)
94 _nc_alloc_screen(void)
96 return ((my_screen = typeCalloc(SCREEN, 1)) != 0);
100 _nc_set_screen(SCREEN *sp)
106 NCURSES_EXPORT_VAR(SCREEN *) SP = NULL; /* Some linkers require initialized data... */
109 #define CHARS_0s { '\0' }
111 #define TGETENT_0 { 0L, FALSE, NULL, NULL, NULL }
112 #define TGETENT_0s { TGETENT_0, TGETENT_0, TGETENT_0, TGETENT_0 }
114 NCURSES_EXPORT_VAR(NCURSES_GLOBALS) _nc_globals = {
115 0, /* have_sigwinch */
116 0, /* cleanup_nested */
118 FALSE, /* init_signals */
119 FALSE, /* init_screen */
121 NULL, /* comp_sourcename */
122 NULL, /* comp_termtype */
124 FALSE, /* have_tic_directory */
125 FALSE, /* keep_tic_directory */
126 TERMINFO, /* tic_directory */
131 NULL, /* first_name */
132 NULL, /* keyname_table */
136 NULL, /* safeprint_buf */
137 0, /* safeprint_used */
139 TGETENT_0s, /* tgetent_cache */
140 0, /* tgetent_index */
141 0, /* tgetent_sequence */
143 0, /* _nc_windowlist */
145 #if USE_HOME_TERMINFO
146 NULL, /* home_terminfo */
149 #if !USE_SAFE_SPRINTF
150 0, /* safeprint_cols */
151 0, /* safeprint_rows */
155 FALSE, /* init_trace */
156 CHARS_0s, /* trace_fname */
160 NULL, /* tracearg_buf */
161 0, /* tracearg_used */
163 NULL, /* tracebuf_ptr */
164 0, /* tracebuf_used */
166 CHARS_0s, /* tracechr_buf */
168 NULL, /* tracedmp_buf */
169 0, /* tracedmp_used */
171 NULL, /* tracetry_buf */
172 0, /* tracetry_used */
174 { CHARS_0s, CHARS_0s }, /* traceatr_color_buf */
175 0, /* traceatr_color_sel */
176 -1, /* traceatr_color_last */
180 PTHREAD_MUTEX_INITIALIZER, /* mutex_curses */
181 PTHREAD_MUTEX_INITIALIZER, /* mutex_tst_tracef */
182 PTHREAD_MUTEX_INITIALIZER, /* mutex_tracef */
183 0, /* nested_tracef */
184 0, /* use_pthreads */
188 #define STACK_FRAME_0 { { 0 }, 0 }
189 #define STACK_FRAME_0s { STACK_FRAME_0 }
190 #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 }
192 #define RIPOFF_0 { 0,0,0 }
193 #define RIPOFF_0s { RIPOFF_0 }
195 NCURSES_EXPORT_VAR(NCURSES_PRESCREEN) _nc_prescreen = {
197 FALSE, /* filter_mode */
198 A_NORMAL, /* previous_attr */
199 RIPOFF_0s, /* ripoff */
205 NULL, /* tparam_base */
207 STACK_FRAME_0s, /* stack */
217 NUM_VARS_0s, /* dynamic_var */
218 NUM_VARS_0s, /* static_vars */
220 NULL, /* saved_tty */
221 #if NCURSES_NO_PADDING
222 FALSE, /* flag to set if padding disabled */
224 #if BROKEN_LINKER || USE_REENTRANT
225 NULL, /* real_acs_map */
231 NULL, /* _tputs_trace */
237 /******************************************************************************/
240 init_global_mutexes(void)
242 static bool initialized = FALSE;
246 _nc_mutex_init(&_nc_globals.mutex_curses);
247 _nc_mutex_init(&_nc_globals.mutex_tst_tracef);
248 _nc_mutex_init(&_nc_globals.mutex_tracef);
253 _nc_init_pthreads(void)
255 if (_nc_use_pthreads)
257 # if USE_WEAK_SYMBOLS
258 if ((pthread_mutex_init) == 0)
260 if ((pthread_mutex_lock) == 0)
262 if ((pthread_mutex_unlock) == 0)
264 if ((pthread_mutex_trylock) == 0)
266 if ((pthread_mutexattr_settype) == 0)
269 _nc_use_pthreads = 1;
270 init_global_mutexes();
274 * Use recursive mutexes if we have them - they're part of Unix98.
275 * For the cases where we do not, _nc_mutex_trylock() is used to avoid a
276 * deadlock, at the expense of memory leaks and unexpected failures that
277 * may not be handled by typical clients.
279 * FIXME - need configure check for PTHREAD_MUTEX_RECURSIVE, define it to
280 * PTHREAD_MUTEX_NORMAL if not supported.
283 _nc_mutex_init(pthread_mutex_t * obj)
285 pthread_mutexattr_t recattr;
287 if (_nc_use_pthreads) {
288 pthread_mutexattr_init(&recattr);
289 pthread_mutexattr_settype(&recattr, PTHREAD_MUTEX_RECURSIVE);
290 pthread_mutex_init(obj, &recattr);
295 _nc_mutex_lock(pthread_mutex_t * obj)
297 if (_nc_use_pthreads == 0)
299 return pthread_mutex_lock(obj);
303 _nc_mutex_trylock(pthread_mutex_t * obj)
305 if (_nc_use_pthreads == 0)
307 return pthread_mutex_trylock(obj);
311 _nc_mutex_unlock(pthread_mutex_t * obj)
313 if (_nc_use_pthreads == 0)
315 return pthread_mutex_unlock(obj);
320 * NB: sigprocmask(2) is global but pthread_sigmask(3p)
321 * only for the calling thread.
324 _nc_sigprocmask(int how, const sigset_t * newmask, sigset_t * oldmask)
326 if ((pthread_sigmask))
327 return pthread_sigmask(how, newmask, oldmask);
329 return sigprocmask(how, newmask, oldmask);
332 #endif /* USE_PTHREADS */