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 48MODULE_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 55NCURSES_EXPORT(WINDOW *) 56NCURSES_PUBLIC_VAR(stdscr) (void) 57{ 58 return CURRENT_SCREEN ? StdScreen(CURRENT_SCREEN) : 0; 59} 60NCURSES_EXPORT(WINDOW *) 61NCURSES_PUBLIC_VAR(curscr) (void) 62{ 63 return CURRENT_SCREEN ? CurScreen(CURRENT_SCREEN) : 0; 64} 65NCURSES_EXPORT(WINDOW *) 66NCURSES_PUBLIC_VAR(newscr) (void) 67{ 68 return CURRENT_SCREEN ? NewScreen(CURRENT_SCREEN) : 0; 69} 70#else 71NCURSES_EXPORT_VAR(WINDOW *) stdscr = 0; 72NCURSES_EXPORT_VAR(WINDOW *) curscr = 0; 73NCURSES_EXPORT_VAR(WINDOW *) newscr = 0; 74#endif 75 76NCURSES_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 89static SCREEN *my_screen; 90 91NCURSES_EXPORT(SCREEN *) 92_nc_screen(void) 93{ 94 return my_screen; 95} 96 97NCURSES_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 105NCURSES_EXPORT(void) 106_nc_set_screen(SCREEN *sp) 107{ 108 my_screen = sp; 109} 110 111#else 112 113NCURSES_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 121NCURSES_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 239NCURSES_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 */ 294NCURSES_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 307static void 308init_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 323NCURSES_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 */ 353NCURSES_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 365NCURSES_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 374NCURSES_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 383NCURSES_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 */ 399NCURSES_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