1 /**************************************************************************** 2 * Copyright 2018,2020 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 46 MODULE_ID("$Id: lib_data.c,v 1.81 2020/06/13 22:01:14 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 53 NCURSES_EXPORT(WINDOW *) 54 NCURSES_PUBLIC_VAR(stdscr) (void) 55 { 56 return CURRENT_SCREEN ? StdScreen(CURRENT_SCREEN) : 0; 57 } 58 NCURSES_EXPORT(WINDOW *) 59 NCURSES_PUBLIC_VAR(curscr) (void) 60 { 61 return CURRENT_SCREEN ? CurScreen(CURRENT_SCREEN) : 0; 62 } 63 NCURSES_EXPORT(WINDOW *) 64 NCURSES_PUBLIC_VAR(newscr) (void) 65 { 66 return CURRENT_SCREEN ? NewScreen(CURRENT_SCREEN) : 0; 67 } 68 #else 69 NCURSES_EXPORT_VAR(WINDOW *) stdscr = 0; 70 NCURSES_EXPORT_VAR(WINDOW *) curscr = 0; 71 NCURSES_EXPORT_VAR(WINDOW *) newscr = 0; 72 #endif 73 74 NCURSES_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 87 static SCREEN *my_screen; 88 89 NCURSES_EXPORT(SCREEN *) 90 _nc_screen(void) 91 { 92 return my_screen; 93 } 94 95 NCURSES_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 } 102 103 NCURSES_EXPORT(void) 104 _nc_set_screen(SCREEN *sp) 105 { 106 my_screen = sp; 107 } 108 109 #else 110 111 NCURSES_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 } 118 119 NCURSES_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 */ 151 152 0, /* dbd_blob */ 153 0, /* dbd_list */ 154 0, /* dbd_size */ 155 0, /* dbd_time */ 156 { { 0, 0 } }, /* dbd_vars */ 157 158 #if HAVE_TSEARCH 159 NULL, /* cached_tparm */ 160 0, /* count_tparm */ 161 #endif /* HAVE_TSEARCH */ 162 163 #ifdef USE_TERM_DRIVER 164 0, /* term_driver */ 165 #endif 166 167 #ifndef USE_SP_WINDOWLIST 168 0, /* _nc_windowlist */ 169 #endif 170 171 #if USE_HOME_TERMINFO 172 NULL, /* home_terminfo */ 173 #endif 174 175 #if !USE_SAFE_SPRINTF 176 0, /* safeprint_cols */ 177 0, /* safeprint_rows */ 178 #endif 179 180 #ifdef USE_PTHREADS 181 PTHREAD_MUTEX_INITIALIZER, /* mutex_curses */ 182 PTHREAD_MUTEX_INITIALIZER, /* mutex_prescreen */ 183 PTHREAD_MUTEX_INITIALIZER, /* mutex_screen */ 184 PTHREAD_MUTEX_INITIALIZER, /* mutex_update */ 185 PTHREAD_MUTEX_INITIALIZER, /* mutex_tst_tracef */ 186 PTHREAD_MUTEX_INITIALIZER, /* mutex_tracef */ 187 0, /* nested_tracef */ 188 0, /* use_pthreads */ 189 #if USE_PTHREADS_EINTR 190 0, /* read_thread */ 191 #endif 192 #endif 193 #if USE_WIDEC_SUPPORT 194 CHARS_0s, /* key_name */ 195 #endif 196 #ifdef TRACE 197 FALSE, /* trace_opened */ 198 CHARS_0s, /* trace_fname */ 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 } 235 236 NCURSES_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, /* dynamic_var */ 255 NUM_VARS_0s, /* static_vars */ 256 #ifdef TRACE 257 NULL, /* tname */ 258 #endif 259 }, 260 NULL, /* saved_tty */ 261 FALSE, /* use_tioctl */ 262 0, /* _outch */ 263 #ifndef USE_SP_RIPOFF 264 RIPOFF_0s, /* ripoff */ 265 NULL, /* rsp */ 266 #endif 267 #if NCURSES_NO_PADDING 268 FALSE, /* flag to set if padding disabled */ 269 #endif 270 #if BROKEN_LINKER || USE_REENTRANT 271 NULL, /* real_acs_map */ 272 0, /* LINES */ 273 0, /* COLS */ 274 8, /* TABSIZE */ 275 1000, /* ESCDELAY */ 276 0, /* cur_term */ 277 #endif 278 #ifdef TRACE 279 #if BROKEN_LINKER || USE_REENTRANT 280 0L, /* _outchars */ 281 NULL, /* _tputs_trace */ 282 #endif 283 #endif 284 }; 285 /* *INDENT-ON* */ 286 287 /* 288 * wgetch() and other functions with a WINDOW* parameter may use a SCREEN* 289 * internally, and it is useful to allow those to be invoked without switching 290 * SCREEN's, e.g., for multi-threaded applications. 291 */ 292 NCURSES_EXPORT(SCREEN *) 293 _nc_screen_of(WINDOW *win) 294 { 295 SCREEN *sp = 0; 296 297 if (win != 0) { 298 sp = WINDOW_EXT(win, screen); 299 } 300 return (sp); 301 } 302 303 /******************************************************************************/ 304 #ifdef USE_PTHREADS 305 static void 306 init_global_mutexes(void) 307 { 308 static bool initialized = FALSE; 309 310 if (!initialized) { 311 initialized = TRUE; 312 _nc_mutex_init(&_nc_globals.mutex_curses); 313 _nc_mutex_init(&_nc_globals.mutex_prescreen); 314 _nc_mutex_init(&_nc_globals.mutex_screen); 315 _nc_mutex_init(&_nc_globals.mutex_update); 316 _nc_mutex_init(&_nc_globals.mutex_tst_tracef); 317 _nc_mutex_init(&_nc_globals.mutex_tracef); 318 } 319 } 320 321 NCURSES_EXPORT(void) 322 _nc_init_pthreads(void) 323 { 324 if (_nc_use_pthreads) 325 return; 326 # if USE_WEAK_SYMBOLS 327 if ((pthread_mutex_init) == 0) 328 return; 329 if ((pthread_mutex_lock) == 0) 330 return; 331 if ((pthread_mutex_unlock) == 0) 332 return; 333 if ((pthread_mutex_trylock) == 0) 334 return; 335 if ((pthread_mutexattr_settype) == 0) 336 return; 337 # endif 338 _nc_use_pthreads = 1; 339 init_global_mutexes(); 340 } 341 342 /* 343 * Use recursive mutexes if we have them - they're part of Unix98. 344 * For the cases where we do not, _nc_mutex_trylock() is used to avoid a 345 * deadlock, at the expense of memory leaks and unexpected failures that 346 * may not be handled by typical clients. 347 * 348 * FIXME - need configure check for PTHREAD_MUTEX_RECURSIVE, define it to 349 * PTHREAD_MUTEX_NORMAL if not supported. 350 */ 351 NCURSES_EXPORT(void) 352 _nc_mutex_init(pthread_mutex_t * obj) 353 { 354 pthread_mutexattr_t recattr; 355 356 if (_nc_use_pthreads) { 357 pthread_mutexattr_init(&recattr); 358 pthread_mutexattr_settype(&recattr, PTHREAD_MUTEX_RECURSIVE); 359 pthread_mutex_init(obj, &recattr); 360 } 361 } 362 363 NCURSES_EXPORT(int) 364 _nc_mutex_lock(pthread_mutex_t * obj) 365 { 366 if (_nc_use_pthreads == 0) 367 return 0; 368 return pthread_mutex_lock(obj); 369 } 370 371 NCURSES_EXPORT(int) 372 _nc_mutex_trylock(pthread_mutex_t * obj) 373 { 374 if (_nc_use_pthreads == 0) 375 return 0; 376 return pthread_mutex_trylock(obj); 377 } 378 379 NCURSES_EXPORT(int) 380 _nc_mutex_unlock(pthread_mutex_t * obj) 381 { 382 if (_nc_use_pthreads == 0) 383 return 0; 384 return pthread_mutex_unlock(obj); 385 } 386 #endif /* USE_PTHREADS */ 387 388 #if defined(USE_PTHREADS) || USE_PTHREADS_EINTR 389 #if USE_WEAK_SYMBOLS 390 /* 391 * NB: sigprocmask(2) is global but pthread_sigmask(3p) 392 * only for the calling thread. 393 */ 394 NCURSES_EXPORT(int) 395 _nc_sigprocmask(int how, const sigset_t * newmask, sigset_t * oldmask) 396 { 397 if ((pthread_sigmask)) 398 return pthread_sigmask(how, newmask, oldmask); 399 else 400 return (sigprocmask) (how, newmask, oldmask); 401 } 402 #endif 403 #endif /* USE_PTHREADS */ 404