1/**************************************************************************** 2 * Copyright 2018-2022,2024 Thomas E. Dickey * 3 * Copyright 1998-2016,2017 Free Software Foundation, Inc. * 4 * * 5 * Permission is hereby granted, free of charge, to any person obtaining a * 6 * copy of this software and associated documentation files (the * 7 * "Software"), to deal in the Software without restriction, including * 8 * without limitation the rights to use, copy, modify, merge, publish, * 9 * distribute, distribute with modifications, sublicense, and/or sell * 10 * copies of the Software, and to permit persons to whom the Software is * 11 * furnished to do so, subject to the following conditions: * 12 * * 13 * The above copyright notice and this permission notice shall be included * 14 * in all copies or substantial portions of the Software. * 15 * * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 19 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 22 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 23 * * 24 * Except as contained in this notice, the name(s) of the above copyright * 25 * holders shall not be used in advertising or otherwise to promote the * 26 * sale, use or other dealings in this Software without prior written * 27 * authorization. * 28 ****************************************************************************/ 29 30/**************************************************************************** 31 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * 32 * and: Eric S. Raymond <esr@snark.thyrsus.com> * 33 * and: Thomas E. Dickey 1996-on * 34 * and: Juergen Pfeifer * 35 ****************************************************************************/ 36 37/* 38** lib_data.c 39** 40** Common data that may/may not be allocated, but is referenced globally 41** 42*/ 43 44#include <curses.priv.h> 45 46MODULE_ID("$Id: lib_data.c,v 1.89 2024/02/24 18:11:38 tom Exp $") 47 48/* 49 * OS/2's native linker complains if we don't initialize public data when 50 * constructing a dll (reported by J.J.G.Ripoll). 51 */ 52#if USE_REENTRANT 53NCURSES_EXPORT(WINDOW *) 54NCURSES_PUBLIC_VAR(stdscr) (void) 55{ 56 return CURRENT_SCREEN ? StdScreen(CURRENT_SCREEN) : 0; 57} 58NCURSES_EXPORT(WINDOW *) 59NCURSES_PUBLIC_VAR(curscr) (void) 60{ 61 return CURRENT_SCREEN ? CurScreen(CURRENT_SCREEN) : 0; 62} 63NCURSES_EXPORT(WINDOW *) 64NCURSES_PUBLIC_VAR(newscr) (void) 65{ 66 return CURRENT_SCREEN ? NewScreen(CURRENT_SCREEN) : 0; 67} 68#else 69NCURSES_EXPORT_VAR(WINDOW *) stdscr = 0; 70NCURSES_EXPORT_VAR(WINDOW *) curscr = 0; 71NCURSES_EXPORT_VAR(WINDOW *) newscr = 0; 72#endif 73 74NCURSES_EXPORT_VAR(SCREEN *) _nc_screen_chain = 0; 75 76/* 77 * The variable 'SP' will be defined as a function on systems that cannot link 78 * data-only modules, since it is used in a lot of places within ncurses and we 79 * cannot guarantee that any application will use any particular function. We 80 * put the WINDOW variables in this module, because it appears that any 81 * application that uses them will also use 'SP'. 82 * 83 * This module intentionally does not reference other ncurses modules, to avoid 84 * module coupling that increases the size of the executable. 85 */ 86#if BROKEN_LINKER 87static SCREEN *my_screen; 88 89NCURSES_EXPORT(SCREEN *) 90_nc_screen(void) 91{ 92 return my_screen; 93} 94 95NCURSES_EXPORT(int) 96_nc_alloc_screen(void) 97{ 98 my_screen = _nc_alloc_screen_sp(); 99 T(("_nc_alloc_screen_sp %p", my_screen)); 100 return (my_screen != 0); 101} 102 103NCURSES_EXPORT(void) 104_nc_set_screen(SCREEN *sp) 105{ 106 my_screen = sp; 107} 108 109#else 110 111NCURSES_EXPORT_VAR(SCREEN *) SP = NULL; /* Some linkers require initialized data... */ 112#endif 113/* *INDENT-OFF* */ 114#define CHARS_0s { '\0' } 115 116#define TGETENT_0 { 0L, FALSE, NULL, NULL, NULL } 117#define TGETENT_0s { TGETENT_0, TGETENT_0, TGETENT_0, TGETENT_0 } 118 119NCURSES_EXPORT_VAR(NCURSES_GLOBALS) _nc_globals = { 120 0, /* have_sigtstp */ 121 0, /* have_sigwinch */ 122 0, /* cleanup_nested */ 123 124 FALSE, /* init_signals */ 125 FALSE, /* init_screen */ 126 127 NULL, /* comp_sourcename */ 128 NULL, /* comp_termtype */ 129 130 FALSE, /* have_tic_directory */ 131 FALSE, /* keep_tic_directory */ 132 0, /* tic_directory */ 133 134 NULL, /* dbi_list */ 135 0, /* dbi_size */ 136 137 NULL, /* first_name */ 138 NULL, /* keyname_table */ 139 0, /* init_keyname */ 140 141 0, /* slk_format */ 142 143 2048, /* getstr_limit */ 144 145 NULL, /* safeprint_buf */ 146 0, /* safeprint_used */ 147 148 TGETENT_0s, /* tgetent_cache */ 149 0, /* tgetent_index */ 150 0, /* tgetent_sequence */ 151 0, /* terminal_count */ 152 153 0, /* dbd_blob */ 154 0, /* dbd_list */ 155 0, /* dbd_size */ 156 0, /* dbd_time */ 157 { { 0, 0 } }, /* dbd_vars */ 158 159#if HAVE_TSEARCH 160 NULL, /* cached_tparm */ 161 0, /* count_tparm */ 162#endif /* HAVE_TSEARCH */ 163 164#ifdef USE_TERM_DRIVER 165 0, /* term_driver */ 166#endif 167 168#ifndef USE_SP_WINDOWLIST 169 0, /* _nc_windowlist */ 170#endif 171 172#if USE_HOME_TERMINFO 173 NULL, /* home_terminfo */ 174#endif 175 176#if !USE_SAFE_SPRINTF 177 0, /* safeprint_cols */ 178 0, /* safeprint_rows */ 179#endif 180 181#ifdef USE_PTHREADS 182 PTHREAD_MUTEX_INITIALIZER, /* mutex_curses */ 183 PTHREAD_MUTEX_INITIALIZER, /* mutex_prescreen */ 184 PTHREAD_MUTEX_INITIALIZER, /* mutex_screen */ 185 PTHREAD_MUTEX_INITIALIZER, /* mutex_update */ 186 PTHREAD_MUTEX_INITIALIZER, /* mutex_tst_tracef */ 187 PTHREAD_MUTEX_INITIALIZER, /* mutex_tracef */ 188 0, /* nested_tracef */ 189 0, /* use_pthreads */ 190#if USE_PTHREADS_EINTR 191 0, /* read_thread */ 192#endif 193#endif 194#if USE_WIDEC_SUPPORT 195 CHARS_0s, /* key_name */ 196#endif 197#ifdef TRACE 198 FALSE, /* trace_opened */ 199 0, /* trace_level */ 200 NULL, /* trace_fp */ 201 -1, /* trace_fd */ 202 203 NULL, /* tracearg_buf */ 204 0, /* tracearg_used */ 205 206 NULL, /* tracebuf_ptr */ 207 0, /* tracebuf_used */ 208 209 CHARS_0s, /* tracechr_buf */ 210 211 NULL, /* tracedmp_buf */ 212 0, /* tracedmp_used */ 213 214 NULL, /* tracetry_buf */ 215 0, /* tracetry_used */ 216 217 { CHARS_0s, CHARS_0s }, /* traceatr_color_buf */ 218 0, /* traceatr_color_sel */ 219 -1, /* traceatr_color_last */ 220#if !defined(USE_PTHREADS) && USE_REENTRANT 221 0, /* nested_tracef */ 222#endif 223#endif /* TRACE */ 224#if NO_LEAKS 225 FALSE, /* leak_checking */ 226#endif 227}; 228 229#define STACK_FRAME_0 { { 0 }, 0 } 230#define STACK_FRAME_0s { STACK_FRAME_0 } 231#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 } 232 233#define RIPOFF_0 { 0,0,0 } 234#define RIPOFF_0s { RIPOFF_0 } 235 236NCURSES_EXPORT_VAR(NCURSES_PRESCREEN) _nc_prescreen = { 237 NULL, /* allocated */ 238 TRUE, /* use_env */ 239 FALSE, /* filter_mode */ 240 A_NORMAL, /* previous_attr */ 241 { /* tparm_state */ 242 NULL, /* tparam_base */ 243 244 STACK_FRAME_0s, /* stack */ 245 0, /* stack_ptr */ 246 247 NULL, /* out_buff */ 248 0, /* out_size */ 249 0, /* out_used */ 250 251 NULL, /* fmt_buff */ 252 0, /* fmt_size */ 253 254 NUM_VARS_0s, /* static_vars */ 255#ifdef TRACE 256 NULL, /* tname */ 257#endif 258 }, 259 NULL, /* saved_tty */ 260 FALSE, /* use_tioctl */ 261 0, /* _outch */ 262#ifndef USE_SP_RIPOFF 263 RIPOFF_0s, /* ripoff */ 264 NULL, /* rsp */ 265#endif 266#if NCURSES_NO_PADDING 267 FALSE, /* flag to set if padding disabled */ 268#endif 269#if BROKEN_LINKER || USE_REENTRANT 270 NULL, /* real_acs_map */ 271 0, /* LINES */ 272 0, /* COLS */ 273 8, /* TABSIZE */ 274 1000, /* ESCDELAY */ 275 0, /* cur_term */ 276#endif 277#ifdef TRACE 278#if BROKEN_LINKER || USE_REENTRANT 279 0L, /* _outchars */ 280 NULL, /* _tputs_trace */ 281#endif 282#endif 283}; 284/* *INDENT-ON* */ 285 286/* 287 * wgetch() and other functions with a WINDOW* parameter may use a SCREEN* 288 * internally, and it is useful to allow those to be invoked without switching 289 * SCREEN's, e.g., for multi-threaded applications. 290 */ 291NCURSES_EXPORT(SCREEN *) 292_nc_screen_of(WINDOW *win) 293{ 294 SCREEN *sp = 0; 295 296 if (win != 0) { 297 sp = WINDOW_EXT(win, screen); 298 } 299 return (sp); 300} 301 302/******************************************************************************/ 303#ifdef USE_PTHREADS 304static void 305init_global_mutexes(void) 306{ 307 static bool initialized = FALSE; 308 309 if (!initialized) { 310 initialized = TRUE; 311 _nc_mutex_init(&_nc_globals.mutex_curses); 312 _nc_mutex_init(&_nc_globals.mutex_prescreen); 313 _nc_mutex_init(&_nc_globals.mutex_screen); 314 _nc_mutex_init(&_nc_globals.mutex_update); 315 _nc_mutex_init(&_nc_globals.mutex_tst_tracef); 316 _nc_mutex_init(&_nc_globals.mutex_tracef); 317 } 318} 319 320NCURSES_EXPORT(void) 321_nc_init_pthreads(void) 322{ 323 if (_nc_use_pthreads) 324 return; 325# if USE_WEAK_SYMBOLS 326 if ((pthread_mutex_init) == 0) 327 return; 328 if ((pthread_mutex_lock) == 0) 329 return; 330 if ((pthread_mutex_unlock) == 0) 331 return; 332 if ((pthread_mutex_trylock) == 0) 333 return; 334 if ((pthread_mutexattr_settype) == 0) 335 return; 336# endif 337 _nc_use_pthreads = 1; 338 init_global_mutexes(); 339} 340 341/* 342 * Use recursive mutexes if we have them - they're part of Unix98. 343 * For the cases where we do not, _nc_mutex_trylock() is used to avoid a 344 * deadlock, at the expense of memory leaks and unexpected failures that 345 * may not be handled by typical clients. 346 * 347 * FIXME - need configure check for PTHREAD_MUTEX_RECURSIVE, define it to 348 * PTHREAD_MUTEX_NORMAL if not supported. 349 */ 350NCURSES_EXPORT(void) 351_nc_mutex_init(pthread_mutex_t * obj) 352{ 353 pthread_mutexattr_t recattr; 354 355 if (_nc_use_pthreads) { 356 pthread_mutexattr_init(&recattr); 357 pthread_mutexattr_settype(&recattr, PTHREAD_MUTEX_RECURSIVE); 358 pthread_mutex_init(obj, &recattr); 359 } 360} 361 362NCURSES_EXPORT(int) 363_nc_mutex_lock(pthread_mutex_t * obj) 364{ 365 int rc = 0; 366 if (_nc_use_pthreads != 0) 367 rc = pthread_mutex_lock(obj); 368 return rc; 369} 370 371NCURSES_EXPORT(int) 372_nc_mutex_trylock(pthread_mutex_t * obj) 373{ 374 int rc = 0; 375 if (_nc_use_pthreads != 0) 376 rc = pthread_mutex_trylock(obj); 377 return rc; 378} 379 380NCURSES_EXPORT(int) 381_nc_mutex_unlock(pthread_mutex_t * obj) 382{ 383 int rc = 0; 384 if (_nc_use_pthreads != 0) 385 rc = pthread_mutex_unlock(obj); 386 return rc; 387} 388#endif /* USE_PTHREADS */ 389 390#if defined(USE_PTHREADS) || USE_PTHREADS_EINTR 391#if USE_WEAK_SYMBOLS 392/* 393 * NB: sigprocmask(2) is global but pthread_sigmask(3p) 394 * only for the calling thread. 395 */ 396NCURSES_EXPORT(int) 397_nc_sigprocmask(int how, const sigset_t * newmask, sigset_t * oldmask) 398{ 399 if ((pthread_sigmask)) 400 return pthread_sigmask(how, newmask, oldmask); 401 else 402 return (sigprocmask) (how, newmask, oldmask); 403} 404#endif 405#endif /* USE_PTHREADS */ 406