1 /* $OpenBSD: lib_data.c,v 1.5 2023/10/17 09:52:09 nicm Exp $ */ 2 3 /**************************************************************************** 4 * Copyright 2018-2021,2022 Thomas E. Dickey * 5 * Copyright 1998-2016,2017 Free Software Foundation, Inc. * 6 * * 7 * Permission is hereby granted, free of charge, to any person obtaining a * 8 * copy of this software and associated documentation files (the * 9 * "Software"), to deal in the Software without restriction, including * 10 * without limitation the rights to use, copy, modify, merge, publish, * 11 * distribute, distribute with modifications, sublicense, and/or sell * 12 * copies of the Software, and to permit persons to whom the Software is * 13 * furnished to do so, subject to the following conditions: * 14 * * 15 * The above copyright notice and this permission notice shall be included * 16 * in all copies or substantial portions of the Software. * 17 * * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 21 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 24 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 25 * * 26 * Except as contained in this notice, the name(s) of the above copyright * 27 * holders shall not be used in advertising or otherwise to promote the * 28 * sale, use or other dealings in this Software without prior written * 29 * authorization. * 30 ****************************************************************************/ 31 32 /**************************************************************************** 33 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * 34 * and: Eric S. Raymond <esr@snark.thyrsus.com> * 35 * and: Thomas E. Dickey 1996-on * 36 * and: Juergen Pfeifer * 37 ****************************************************************************/ 38 39 /* 40 ** lib_data.c 41 ** 42 ** Common data that may/may not be allocated, but is referenced globally 43 ** 44 */ 45 46 #include <curses.priv.h> 47 48 MODULE_ID("$Id: lib_data.c,v 1.5 2023/10/17 09:52:09 nicm Exp $") 49 50 /* 51 * OS/2's native linker complains if we don't initialize public data when 52 * constructing a dll (reported by J.J.G.Ripoll). 53 */ 54 #if USE_REENTRANT 55 NCURSES_EXPORT(WINDOW *) 56 NCURSES_PUBLIC_VAR(stdscr) (void) 57 { 58 return CURRENT_SCREEN ? StdScreen(CURRENT_SCREEN) : 0; 59 } 60 NCURSES_EXPORT(WINDOW *) 61 NCURSES_PUBLIC_VAR(curscr) (void) 62 { 63 return CURRENT_SCREEN ? CurScreen(CURRENT_SCREEN) : 0; 64 } 65 NCURSES_EXPORT(WINDOW *) 66 NCURSES_PUBLIC_VAR(newscr) (void) 67 { 68 return CURRENT_SCREEN ? NewScreen(CURRENT_SCREEN) : 0; 69 } 70 #else 71 NCURSES_EXPORT_VAR(WINDOW *) stdscr = 0; 72 NCURSES_EXPORT_VAR(WINDOW *) curscr = 0; 73 NCURSES_EXPORT_VAR(WINDOW *) newscr = 0; 74 #endif 75 76 NCURSES_EXPORT_VAR(SCREEN *) _nc_screen_chain = 0; 77 78 /* 79 * The variable 'SP' will be defined as a function on systems that cannot link 80 * data-only modules, since it is used in a lot of places within ncurses and we 81 * cannot guarantee that any application will use any particular function. We 82 * put the WINDOW variables in this module, because it appears that any 83 * application that uses them will also use 'SP'. 84 * 85 * This module intentionally does not reference other ncurses modules, to avoid 86 * module coupling that increases the size of the executable. 87 */ 88 #if BROKEN_LINKER 89 static SCREEN *my_screen; 90 91 NCURSES_EXPORT(SCREEN *) 92 _nc_screen(void) 93 { 94 return my_screen; 95 } 96 97 NCURSES_EXPORT(int) 98 _nc_alloc_screen(void) 99 { 100 my_screen = _nc_alloc_screen_sp(); 101 T(("_nc_alloc_screen_sp %p", my_screen)); 102 return (my_screen != 0); 103 } 104 105 NCURSES_EXPORT(void) 106 _nc_set_screen(SCREEN *sp) 107 { 108 my_screen = sp; 109 } 110 111 #else 112 113 NCURSES_EXPORT_VAR(SCREEN *) SP = NULL; /* Some linkers require initialized data... */ 114 #endif 115 /* *INDENT-OFF* */ 116 #define CHARS_0s { '\0' } 117 118 #define TGETENT_0 { 0L, FALSE, NULL, NULL, NULL } 119 #define TGETENT_0s { TGETENT_0, TGETENT_0, TGETENT_0, TGETENT_0 } 120 121 NCURSES_EXPORT_VAR(NCURSES_GLOBALS) _nc_globals = { 122 0, /* have_sigtstp */ 123 0, /* have_sigwinch */ 124 0, /* cleanup_nested */ 125 126 FALSE, /* init_signals */ 127 FALSE, /* init_screen */ 128 129 NULL, /* comp_sourcename */ 130 NULL, /* comp_termtype */ 131 132 FALSE, /* have_tic_directory */ 133 FALSE, /* keep_tic_directory */ 134 0, /* tic_directory */ 135 136 NULL, /* dbi_list */ 137 0, /* dbi_size */ 138 139 NULL, /* first_name */ 140 NULL, /* keyname_table */ 141 0, /* init_keyname */ 142 143 0, /* slk_format */ 144 145 2048, /* getstr_limit */ 146 147 NULL, /* safeprint_buf */ 148 0, /* safeprint_used */ 149 150 TGETENT_0s, /* tgetent_cache */ 151 0, /* tgetent_index */ 152 0, /* tgetent_sequence */ 153 0, /* terminal_count */ 154 155 0, /* dbd_blob */ 156 0, /* dbd_list */ 157 0, /* dbd_size */ 158 0, /* dbd_time */ 159 { { 0, 0 } }, /* dbd_vars */ 160 161 #if HAVE_TSEARCH 162 NULL, /* cached_tparm */ 163 0, /* count_tparm */ 164 #endif /* HAVE_TSEARCH */ 165 166 #ifdef USE_TERM_DRIVER 167 0, /* term_driver */ 168 #endif 169 170 #ifndef USE_SP_WINDOWLIST 171 0, /* _nc_windowlist */ 172 #endif 173 174 #if USE_HOME_TERMINFO 175 NULL, /* home_terminfo */ 176 #endif 177 178 #if !USE_SAFE_SPRINTF 179 0, /* safeprint_cols */ 180 0, /* safeprint_rows */ 181 #endif 182 183 #ifdef USE_PTHREADS 184 PTHREAD_MUTEX_INITIALIZER, /* mutex_curses */ 185 PTHREAD_MUTEX_INITIALIZER, /* mutex_prescreen */ 186 PTHREAD_MUTEX_INITIALIZER, /* mutex_screen */ 187 PTHREAD_MUTEX_INITIALIZER, /* mutex_update */ 188 PTHREAD_MUTEX_INITIALIZER, /* mutex_tst_tracef */ 189 PTHREAD_MUTEX_INITIALIZER, /* mutex_tracef */ 190 0, /* nested_tracef */ 191 0, /* use_pthreads */ 192 #if USE_PTHREADS_EINTR 193 0, /* read_thread */ 194 #endif 195 #endif 196 #if USE_WIDEC_SUPPORT 197 CHARS_0s, /* key_name */ 198 #endif 199 #ifdef TRACE 200 FALSE, /* trace_opened */ 201 CHARS_0s, /* trace_fname */ 202 0, /* trace_level */ 203 NULL, /* trace_fp */ 204 -1, /* trace_fd */ 205 206 NULL, /* tracearg_buf */ 207 0, /* tracearg_used */ 208 209 NULL, /* tracebuf_ptr */ 210 0, /* tracebuf_used */ 211 212 CHARS_0s, /* tracechr_buf */ 213 214 NULL, /* tracedmp_buf */ 215 0, /* tracedmp_used */ 216 217 NULL, /* tracetry_buf */ 218 0, /* tracetry_used */ 219 220 { CHARS_0s, CHARS_0s }, /* traceatr_color_buf */ 221 0, /* traceatr_color_sel */ 222 -1, /* traceatr_color_last */ 223 #if !defined(USE_PTHREADS) && USE_REENTRANT 224 0, /* nested_tracef */ 225 #endif 226 #endif /* TRACE */ 227 #if NO_LEAKS 228 FALSE, /* leak_checking */ 229 #endif 230 }; 231 232 #define STACK_FRAME_0 { { 0 }, 0 } 233 #define STACK_FRAME_0s { STACK_FRAME_0 } 234 #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 } 235 236 #define RIPOFF_0 { 0,0,0 } 237 #define RIPOFF_0s { RIPOFF_0 } 238 239 NCURSES_EXPORT_VAR(NCURSES_PRESCREEN) _nc_prescreen = { 240 NULL, /* allocated */ 241 TRUE, /* use_env */ 242 FALSE, /* filter_mode */ 243 A_NORMAL, /* previous_attr */ 244 { /* tparm_state */ 245 NULL, /* tparam_base */ 246 247 STACK_FRAME_0s, /* stack */ 248 0, /* stack_ptr */ 249 250 NULL, /* out_buff */ 251 0, /* out_size */ 252 0, /* out_used */ 253 254 NULL, /* fmt_buff */ 255 0, /* fmt_size */ 256 257 NUM_VARS_0s, /* static_vars */ 258 #ifdef TRACE 259 NULL, /* tname */ 260 #endif 261 }, 262 NULL, /* saved_tty */ 263 FALSE, /* use_tioctl */ 264 0, /* _outch */ 265 #ifndef USE_SP_RIPOFF 266 RIPOFF_0s, /* ripoff */ 267 NULL, /* rsp */ 268 #endif 269 #if NCURSES_NO_PADDING 270 FALSE, /* flag to set if padding disabled */ 271 #endif 272 #if BROKEN_LINKER || USE_REENTRANT 273 NULL, /* real_acs_map */ 274 0, /* LINES */ 275 0, /* COLS */ 276 8, /* TABSIZE */ 277 1000, /* ESCDELAY */ 278 0, /* cur_term */ 279 #endif 280 #ifdef TRACE 281 #if BROKEN_LINKER || USE_REENTRANT 282 0L, /* _outchars */ 283 NULL, /* _tputs_trace */ 284 #endif 285 #endif 286 }; 287 /* *INDENT-ON* */ 288 289 /* 290 * wgetch() and other functions with a WINDOW* parameter may use a SCREEN* 291 * internally, and it is useful to allow those to be invoked without switching 292 * SCREEN's, e.g., for multi-threaded applications. 293 */ 294 NCURSES_EXPORT(SCREEN *) 295 _nc_screen_of(WINDOW *win) 296 { 297 SCREEN *sp = 0; 298 299 if (win != 0) { 300 sp = WINDOW_EXT(win, screen); 301 } 302 return (sp); 303 } 304 305 /******************************************************************************/ 306 #ifdef USE_PTHREADS 307 static void 308 init_global_mutexes(void) 309 { 310 static bool initialized = FALSE; 311 312 if (!initialized) { 313 initialized = TRUE; 314 _nc_mutex_init(&_nc_globals.mutex_curses); 315 _nc_mutex_init(&_nc_globals.mutex_prescreen); 316 _nc_mutex_init(&_nc_globals.mutex_screen); 317 _nc_mutex_init(&_nc_globals.mutex_update); 318 _nc_mutex_init(&_nc_globals.mutex_tst_tracef); 319 _nc_mutex_init(&_nc_globals.mutex_tracef); 320 } 321 } 322 323 NCURSES_EXPORT(void) 324 _nc_init_pthreads(void) 325 { 326 if (_nc_use_pthreads) 327 return; 328 # if USE_WEAK_SYMBOLS 329 if ((pthread_mutex_init) == 0) 330 return; 331 if ((pthread_mutex_lock) == 0) 332 return; 333 if ((pthread_mutex_unlock) == 0) 334 return; 335 if ((pthread_mutex_trylock) == 0) 336 return; 337 if ((pthread_mutexattr_settype) == 0) 338 return; 339 # endif 340 _nc_use_pthreads = 1; 341 init_global_mutexes(); 342 } 343 344 /* 345 * Use recursive mutexes if we have them - they're part of Unix98. 346 * For the cases where we do not, _nc_mutex_trylock() is used to avoid a 347 * deadlock, at the expense of memory leaks and unexpected failures that 348 * may not be handled by typical clients. 349 * 350 * FIXME - need configure check for PTHREAD_MUTEX_RECURSIVE, define it to 351 * PTHREAD_MUTEX_NORMAL if not supported. 352 */ 353 NCURSES_EXPORT(void) 354 _nc_mutex_init(pthread_mutex_t * obj) 355 { 356 pthread_mutexattr_t recattr; 357 358 if (_nc_use_pthreads) { 359 pthread_mutexattr_init(&recattr); 360 pthread_mutexattr_settype(&recattr, PTHREAD_MUTEX_RECURSIVE); 361 pthread_mutex_init(obj, &recattr); 362 } 363 } 364 365 NCURSES_EXPORT(int) 366 _nc_mutex_lock(pthread_mutex_t * obj) 367 { 368 int rc = 0; 369 if (_nc_use_pthreads != 0) 370 rc = pthread_mutex_lock(obj); 371 return rc; 372 } 373 374 NCURSES_EXPORT(int) 375 _nc_mutex_trylock(pthread_mutex_t * obj) 376 { 377 int rc = 0; 378 if (_nc_use_pthreads != 0) 379 rc = pthread_mutex_trylock(obj); 380 return rc; 381 } 382 383 NCURSES_EXPORT(int) 384 _nc_mutex_unlock(pthread_mutex_t * obj) 385 { 386 int rc = 0; 387 if (_nc_use_pthreads != 0) 388 rc = pthread_mutex_unlock(obj); 389 return rc; 390 } 391 #endif /* USE_PTHREADS */ 392 393 #if defined(USE_PTHREADS) || USE_PTHREADS_EINTR 394 #if USE_WEAK_SYMBOLS 395 /* 396 * NB: sigprocmask(2) is global but pthread_sigmask(3p) 397 * only for the calling thread. 398 */ 399 NCURSES_EXPORT(int) 400 _nc_sigprocmask(int how, const sigset_t * newmask, sigset_t * oldmask) 401 { 402 if ((pthread_sigmask)) 403 return pthread_sigmask(how, newmask, oldmask); 404 else 405 return (sigprocmask) (how, newmask, oldmask); 406 } 407 #endif 408 #endif /* USE_PTHREADS */ 409