| 1 | /* Extended support for using signal values. |
| 2 | Written by Fred Fish. fnf@cygnus.com |
| 3 | This file is in the public domain. */ |
| 4 | |
| 5 | #include "config.h" |
| 6 | #include "ansidecl.h" |
| 7 | #include "libiberty.h" |
| 8 | |
| 9 | /* We need to declare sys_siglist, because even if the system provides |
| 10 | it we can't assume that it is declared in <signal.h> (for example, |
| 11 | SunOS provides sys_siglist, but it does not declare it in any |
| 12 | header file). However, we can't declare sys_siglist portably, |
| 13 | because on some systems it is declared with const and on some |
| 14 | systems it is declared without const. If we were using autoconf, |
| 15 | we could work out the right declaration. Until, then we just |
| 16 | ignore any declaration in the system header files, and always |
| 17 | declare it ourselves. With luck, this will always work. */ |
| 18 | #define sys_siglist no_such_symbol |
| 19 | #define sys_nsig sys_nsig__no_such_symbol |
| 20 | |
| 21 | #include <stdio.h> |
| 22 | #include <signal.h> |
| 23 | |
| 24 | /* Routines imported from standard C runtime libraries. */ |
| 25 | |
| 26 | #ifdef HAVE_STDLIB_H |
| 27 | #include <stdlib.h> |
| 28 | #else |
| 29 | extern PTR malloc (); |
| 30 | #endif |
| 31 | |
| 32 | #ifdef HAVE_STRING_H |
| 33 | #include <string.h> |
| 34 | #else |
| 35 | extern PTR memset (); |
| 36 | #endif |
| 37 | |
| 38 | /* Undefine the macro we used to hide the definition of sys_siglist |
| 39 | found in the system header files. */ |
| 40 | #undef sys_siglist |
| 41 | #undef sys_nsig |
| 42 | |
| 43 | #ifndef NULL |
| 44 | # define NULL (void *) 0 |
| 45 | #endif |
| 46 | |
| 47 | #ifndef MAX |
| 48 | # define MAX(a,b) ((a) > (b) ? (a) : (b)) |
| 49 | #endif |
| 50 | |
| 51 | static void init_signal_tables (void); |
| 52 | |
| 53 | /* Translation table for signal values. |
| 54 | |
| 55 | Note that this table is generally only accessed when it is used at runtime |
| 56 | to initialize signal name and message tables that are indexed by signal |
| 57 | value. |
| 58 | |
| 59 | Not all of these signals will exist on all systems. This table is the only |
| 60 | thing that should have to be updated as new signal numbers are introduced. |
| 61 | It's sort of ugly, but at least its portable. */ |
| 62 | |
| 63 | struct signal_info |
| 64 | { |
| 65 | const int value; /* The numeric value from <signal.h> */ |
| 66 | const char *const name; /* The equivalent symbolic value */ |
| 67 | #ifndef HAVE_SYS_SIGLIST |
| 68 | const char *const msg; /* Short message about this value */ |
| 69 | #endif |
| 70 | }; |
| 71 | |
| 72 | #ifndef HAVE_SYS_SIGLIST |
| 73 | # define ENTRY(value, name, msg) {value, name, msg} |
| 74 | #else |
| 75 | # define ENTRY(value, name, msg) {value, name} |
| 76 | #endif |
| 77 | |
| 78 | static const struct signal_info signal_table[] = |
| 79 | { |
| 80 | #if defined (SIGHUP) |
| 81 | ENTRY(SIGHUP, "SIGHUP", "Hangup"), |
| 82 | #endif |
| 83 | #if defined (SIGINT) |
| 84 | ENTRY(SIGINT, "SIGINT", "Interrupt"), |
| 85 | #endif |
| 86 | #if defined (SIGQUIT) |
| 87 | ENTRY(SIGQUIT, "SIGQUIT", "Quit"), |
| 88 | #endif |
| 89 | #if defined (SIGILL) |
| 90 | ENTRY(SIGILL, "SIGILL", "Illegal instruction"), |
| 91 | #endif |
| 92 | #if defined (SIGTRAP) |
| 93 | ENTRY(SIGTRAP, "SIGTRAP", "Trace/breakpoint trap"), |
| 94 | #endif |
| 95 | /* Put SIGIOT before SIGABRT, so that if SIGIOT==SIGABRT then SIGABRT |
| 96 | overrides SIGIOT. SIGABRT is in ANSI and POSIX.1, and SIGIOT isn't. */ |
| 97 | #if defined (SIGIOT) |
| 98 | ENTRY(SIGIOT, "SIGIOT", "IOT trap"), |
| 99 | #endif |
| 100 | #if defined (SIGABRT) |
| 101 | ENTRY(SIGABRT, "SIGABRT", "Aborted"), |
| 102 | #endif |
| 103 | #if defined (SIGEMT) |
| 104 | ENTRY(SIGEMT, "SIGEMT", "Emulation trap"), |
| 105 | #endif |
| 106 | #if defined (SIGFPE) |
| 107 | ENTRY(SIGFPE, "SIGFPE", "Arithmetic exception"), |
| 108 | #endif |
| 109 | #if defined (SIGKILL) |
| 110 | ENTRY(SIGKILL, "SIGKILL", "Killed"), |
| 111 | #endif |
| 112 | #if defined (SIGBUS) |
| 113 | ENTRY(SIGBUS, "SIGBUS", "Bus error"), |
| 114 | #endif |
| 115 | #if defined (SIGSEGV) |
| 116 | ENTRY(SIGSEGV, "SIGSEGV", "Segmentation fault"), |
| 117 | #endif |
| 118 | #if defined (SIGSYS) |
| 119 | ENTRY(SIGSYS, "SIGSYS", "Bad system call"), |
| 120 | #endif |
| 121 | #if defined (SIGPIPE) |
| 122 | ENTRY(SIGPIPE, "SIGPIPE", "Broken pipe"), |
| 123 | #endif |
| 124 | #if defined (SIGALRM) |
| 125 | ENTRY(SIGALRM, "SIGALRM", "Alarm clock"), |
| 126 | #endif |
| 127 | #if defined (SIGTERM) |
| 128 | ENTRY(SIGTERM, "SIGTERM", "Terminated"), |
| 129 | #endif |
| 130 | #if defined (SIGUSR1) |
| 131 | ENTRY(SIGUSR1, "SIGUSR1", "User defined signal 1"), |
| 132 | #endif |
| 133 | #if defined (SIGUSR2) |
| 134 | ENTRY(SIGUSR2, "SIGUSR2", "User defined signal 2"), |
| 135 | #endif |
| 136 | /* Put SIGCLD before SIGCHLD, so that if SIGCLD==SIGCHLD then SIGCHLD |
| 137 | overrides SIGCLD. SIGCHLD is in POXIX.1 */ |
| 138 | #if defined (SIGCLD) |
| 139 | ENTRY(SIGCLD, "SIGCLD", "Child status changed"), |
| 140 | #endif |
| 141 | #if defined (SIGCHLD) |
| 142 | ENTRY(SIGCHLD, "SIGCHLD", "Child status changed"), |
| 143 | #endif |
| 144 | #if defined (SIGPWR) |
| 145 | ENTRY(SIGPWR, "SIGPWR", "Power fail/restart"), |
| 146 | #endif |
| 147 | #if defined (SIGWINCH) |
| 148 | ENTRY(SIGWINCH, "SIGWINCH", "Window size changed"), |
| 149 | #endif |
| 150 | #if defined (SIGURG) |
| 151 | ENTRY(SIGURG, "SIGURG", "Urgent I/O condition"), |
| 152 | #endif |
| 153 | #if defined (SIGIO) |
| 154 | /* "I/O pending" has also been suggested, but is misleading since the |
| 155 | signal only happens when the process has asked for it, not everytime |
| 156 | I/O is pending. */ |
| 157 | ENTRY(SIGIO, "SIGIO", "I/O possible"), |
| 158 | #endif |
| 159 | #if defined (SIGPOLL) |
| 160 | ENTRY(SIGPOLL, "SIGPOLL", "Pollable event occurred"), |
| 161 | #endif |
| 162 | #if defined (SIGSTOP) |
| 163 | ENTRY(SIGSTOP, "SIGSTOP", "Stopped (signal)"), |
| 164 | #endif |
| 165 | #if defined (SIGTSTP) |
| 166 | ENTRY(SIGTSTP, "SIGTSTP", "Stopped (user)"), |
| 167 | #endif |
| 168 | #if defined (SIGCONT) |
| 169 | ENTRY(SIGCONT, "SIGCONT", "Continued"), |
| 170 | #endif |
| 171 | #if defined (SIGTTIN) |
| 172 | ENTRY(SIGTTIN, "SIGTTIN", "Stopped (tty input)"), |
| 173 | #endif |
| 174 | #if defined (SIGTTOU) |
| 175 | ENTRY(SIGTTOU, "SIGTTOU", "Stopped (tty output)"), |
| 176 | #endif |
| 177 | #if defined (SIGVTALRM) |
| 178 | ENTRY(SIGVTALRM, "SIGVTALRM", "Virtual timer expired"), |
| 179 | #endif |
| 180 | #if defined (SIGPROF) |
| 181 | ENTRY(SIGPROF, "SIGPROF", "Profiling timer expired"), |
| 182 | #endif |
| 183 | #if defined (SIGXCPU) |
| 184 | ENTRY(SIGXCPU, "SIGXCPU", "CPU time limit exceeded"), |
| 185 | #endif |
| 186 | #if defined (SIGXFSZ) |
| 187 | ENTRY(SIGXFSZ, "SIGXFSZ", "File size limit exceeded"), |
| 188 | #endif |
| 189 | #if defined (SIGWIND) |
| 190 | ENTRY(SIGWIND, "SIGWIND", "SIGWIND"), |
| 191 | #endif |
| 192 | #if defined (SIGPHONE) |
| 193 | ENTRY(SIGPHONE, "SIGPHONE", "SIGPHONE"), |
| 194 | #endif |
| 195 | #if defined (SIGLOST) |
| 196 | ENTRY(SIGLOST, "SIGLOST", "Resource lost"), |
| 197 | #endif |
| 198 | #if defined (SIGWAITING) |
| 199 | ENTRY(SIGWAITING, "SIGWAITING", "Process's LWPs are blocked"), |
| 200 | #endif |
| 201 | #if defined (SIGLWP) |
| 202 | ENTRY(SIGLWP, "SIGLWP", "Signal LWP"), |
| 203 | #endif |
| 204 | #if defined (SIGDANGER) |
| 205 | ENTRY(SIGDANGER, "SIGDANGER", "Swap space dangerously low"), |
| 206 | #endif |
| 207 | #if defined (SIGGRANT) |
| 208 | ENTRY(SIGGRANT, "SIGGRANT", "Monitor mode granted"), |
| 209 | #endif |
| 210 | #if defined (SIGRETRACT) |
| 211 | ENTRY(SIGRETRACT, "SIGRETRACT", "Need to relinguish monitor mode"), |
| 212 | #endif |
| 213 | #if defined (SIGMSG) |
| 214 | ENTRY(SIGMSG, "SIGMSG", "Monitor mode data available"), |
| 215 | #endif |
| 216 | #if defined (SIGSOUND) |
| 217 | ENTRY(SIGSOUND, "SIGSOUND", "Sound completed"), |
| 218 | #endif |
| 219 | #if defined (SIGSAK) |
| 220 | ENTRY(SIGSAK, "SIGSAK", "Secure attention"), |
| 221 | #endif |
| 222 | ENTRY(0, NULL, NULL) |
| 223 | }; |
| 224 | |
| 225 | /* Translation table allocated and initialized at runtime. Indexed by the |
| 226 | signal value to find the equivalent symbolic value. */ |
| 227 | |
| 228 | static const char **signal_names; |
| 229 | static int num_signal_names = 0; |
| 230 | |
| 231 | /* Translation table allocated and initialized at runtime, if it does not |
| 232 | already exist in the host environment. Indexed by the signal value to find |
| 233 | the descriptive string. |
| 234 | |
| 235 | We don't export it for use in other modules because even though it has the |
| 236 | same name, it differs from other implementations in that it is dynamically |
| 237 | initialized rather than statically initialized. */ |
| 238 | |
| 239 | #ifndef HAVE_SYS_SIGLIST |
| 240 | |
| 241 | static int sys_nsig; |
| 242 | static const char **sys_siglist; |
| 243 | |
| 244 | #else |
| 245 | |
| 246 | #ifdef NSIG |
| 247 | static int sys_nsig = NSIG; |
| 248 | #else |
| 249 | #ifdef _NSIG |
| 250 | static int sys_nsig = _NSIG; |
| 251 | #endif |
| 252 | #endif |
| 253 | extern const char * const sys_siglist[]; |
| 254 | |
| 255 | #endif |
| 256 | |
| 257 | |
| 258 | /* |
| 259 | |
| 260 | NAME |
| 261 | |
| 262 | init_signal_tables -- initialize the name and message tables |
| 263 | |
| 264 | SYNOPSIS |
| 265 | |
| 266 | static void init_signal_tables (); |
| 267 | |
| 268 | DESCRIPTION |
| 269 | |
| 270 | Using the signal_table, which is initialized at compile time, generate |
| 271 | the signal_names and the sys_siglist (if needed) tables, which are |
| 272 | indexed at runtime by a specific signal value. |
| 273 | |
| 274 | BUGS |
| 275 | |
| 276 | The initialization of the tables may fail under low memory conditions, |
| 277 | in which case we don't do anything particularly useful, but we don't |
| 278 | bomb either. Who knows, it might succeed at a later point if we free |
| 279 | some memory in the meantime. In any case, the other routines know |
| 280 | how to deal with lack of a table after trying to initialize it. This |
| 281 | may or may not be considered to be a bug, that we don't specifically |
| 282 | warn about this particular failure mode. |
| 283 | |
| 284 | */ |
| 285 | |
| 286 | static void |
| 287 | init_signal_tables (void) |
| 288 | { |
| 289 | const struct signal_info *eip; |
| 290 | int nbytes; |
| 291 | |
| 292 | /* If we haven't already scanned the signal_table once to find the maximum |
| 293 | signal value, then go find it now. */ |
| 294 | |
| 295 | if (num_signal_names == 0) |
| 296 | { |
| 297 | for (eip = signal_table; eip -> name != NULL; eip++) |
| 298 | { |
| 299 | if (eip -> value >= num_signal_names) |
| 300 | { |
| 301 | num_signal_names = eip -> value + 1; |
| 302 | } |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | /* Now attempt to allocate the signal_names table, zero it out, and then |
| 307 | initialize it from the statically initialized signal_table. */ |
| 308 | |
| 309 | if (signal_names == NULL) |
| 310 | { |
| 311 | nbytes = num_signal_names * sizeof (char *); |
| 312 | if ((signal_names = (const char **) malloc (nbytes)) != NULL) |
| 313 | { |
| 314 | memset (signal_names, 0, nbytes); |
| 315 | for (eip = signal_table; eip -> name != NULL; eip++) |
| 316 | { |
| 317 | signal_names[eip -> value] = eip -> name; |
| 318 | } |
| 319 | } |
| 320 | } |
| 321 | |
| 322 | #ifndef HAVE_SYS_SIGLIST |
| 323 | |
| 324 | /* Now attempt to allocate the sys_siglist table, zero it out, and then |
| 325 | initialize it from the statically initialized signal_table. */ |
| 326 | |
| 327 | if (sys_siglist == NULL) |
| 328 | { |
| 329 | nbytes = num_signal_names * sizeof (char *); |
| 330 | if ((sys_siglist = (const char **) malloc (nbytes)) != NULL) |
| 331 | { |
| 332 | memset (sys_siglist, 0, nbytes); |
| 333 | sys_nsig = num_signal_names; |
| 334 | for (eip = signal_table; eip -> name != NULL; eip++) |
| 335 | { |
| 336 | sys_siglist[eip -> value] = eip -> msg; |
| 337 | } |
| 338 | } |
| 339 | } |
| 340 | |
| 341 | #endif |
| 342 | |
| 343 | } |
| 344 | |
| 345 | |
| 346 | /* |
| 347 | |
| 348 | @deftypefn Extension int signo_max (void) |
| 349 | |
| 350 | Returns the maximum signal value for which a corresponding symbolic |
| 351 | name or message is available. Note that in the case where we use the |
| 352 | @code{sys_siglist} supplied by the system, it is possible for there to |
| 353 | be more symbolic names than messages, or vice versa. In fact, the |
| 354 | manual page for @code{psignal(3b)} explicitly warns that one should |
| 355 | check the size of the table (@code{NSIG}) before indexing it, since |
| 356 | new signal codes may be added to the system before they are added to |
| 357 | the table. Thus @code{NSIG} might be smaller than value implied by |
| 358 | the largest signo value defined in @code{<signal.h>}. |
| 359 | |
| 360 | We return the maximum value that can be used to obtain a meaningful |
| 361 | symbolic name or message. |
| 362 | |
| 363 | @end deftypefn |
| 364 | |
| 365 | */ |
| 366 | |
| 367 | int |
| 368 | signo_max (void) |
| 369 | { |
| 370 | int maxsize; |
| 371 | |
| 372 | if (signal_names == NULL) |
| 373 | { |
| 374 | init_signal_tables (); |
| 375 | } |
| 376 | maxsize = MAX (sys_nsig, num_signal_names); |
| 377 | return (maxsize - 1); |
| 378 | } |
| 379 | |
| 380 | |
| 381 | /* |
| 382 | |
| 383 | @deftypefn Supplemental {const char *} strsignal (int @var{signo}) |
| 384 | |
| 385 | Maps an signal number to an signal message string, the contents of |
| 386 | which are implementation defined. On systems which have the external |
| 387 | variable @code{sys_siglist}, these strings will be the same as the |
| 388 | ones used by @code{psignal()}. |
| 389 | |
| 390 | If the supplied signal number is within the valid range of indices for |
| 391 | the @code{sys_siglist}, but no message is available for the particular |
| 392 | signal number, then returns the string @samp{Signal @var{num}}, where |
| 393 | @var{num} is the signal number. |
| 394 | |
| 395 | If the supplied signal number is not a valid index into |
| 396 | @code{sys_siglist}, returns @code{NULL}. |
| 397 | |
| 398 | The returned string is only guaranteed to be valid only until the next |
| 399 | call to @code{strsignal}. |
| 400 | |
| 401 | @end deftypefn |
| 402 | |
| 403 | */ |
| 404 | |
| 405 | #ifndef HAVE_STRSIGNAL |
| 406 | |
| 407 | char * |
| 408 | strsignal (int signo) |
| 409 | { |
| 410 | char *msg; |
| 411 | static char buf[32]; |
| 412 | |
| 413 | #ifndef HAVE_SYS_SIGLIST |
| 414 | |
| 415 | if (signal_names == NULL) |
| 416 | { |
| 417 | init_signal_tables (); |
| 418 | } |
| 419 | |
| 420 | #endif |
| 421 | |
| 422 | if ((signo < 0) || (signo >= sys_nsig)) |
| 423 | { |
| 424 | /* Out of range, just return NULL */ |
| 425 | msg = NULL; |
| 426 | } |
| 427 | else if ((sys_siglist == NULL) || (sys_siglist[signo] == NULL)) |
| 428 | { |
| 429 | /* In range, but no sys_siglist or no entry at this index. */ |
| 430 | sprintf (buf, "Signal %d", signo); |
| 431 | msg = buf; |
| 432 | } |
| 433 | else |
| 434 | { |
| 435 | /* In range, and a valid message. Just return the message. We |
| 436 | can safely cast away const, since POSIX says the user must |
| 437 | not modify the result. */ |
| 438 | msg = (char *) sys_siglist[signo]; |
| 439 | } |
| 440 | |
| 441 | return (msg); |
| 442 | } |
| 443 | |
| 444 | #endif /* ! HAVE_STRSIGNAL */ |
| 445 | |
| 446 | /* |
| 447 | |
| 448 | @deftypefn Extension {const char*} strsigno (int @var{signo}) |
| 449 | |
| 450 | Given an signal number, returns a pointer to a string containing the |
| 451 | symbolic name of that signal number, as found in @code{<signal.h>}. |
| 452 | |
| 453 | If the supplied signal number is within the valid range of indices for |
| 454 | symbolic names, but no name is available for the particular signal |
| 455 | number, then returns the string @samp{Signal @var{num}}, where |
| 456 | @var{num} is the signal number. |
| 457 | |
| 458 | If the supplied signal number is not within the range of valid |
| 459 | indices, then returns @code{NULL}. |
| 460 | |
| 461 | The contents of the location pointed to are only guaranteed to be |
| 462 | valid until the next call to @code{strsigno}. |
| 463 | |
| 464 | @end deftypefn |
| 465 | |
| 466 | */ |
| 467 | |
| 468 | const char * |
| 469 | strsigno (int signo) |
| 470 | { |
| 471 | const char *name; |
| 472 | static char buf[32]; |
| 473 | |
| 474 | if (signal_names == NULL) |
| 475 | { |
| 476 | init_signal_tables (); |
| 477 | } |
| 478 | |
| 479 | if ((signo < 0) || (signo >= num_signal_names)) |
| 480 | { |
| 481 | /* Out of range, just return NULL */ |
| 482 | name = NULL; |
| 483 | } |
| 484 | else if ((signal_names == NULL) || (signal_names[signo] == NULL)) |
| 485 | { |
| 486 | /* In range, but no signal_names or no entry at this index. */ |
| 487 | sprintf (buf, "Signal %d", signo); |
| 488 | name = (const char *) buf; |
| 489 | } |
| 490 | else |
| 491 | { |
| 492 | /* In range, and a valid name. Just return the name. */ |
| 493 | name = signal_names[signo]; |
| 494 | } |
| 495 | |
| 496 | return (name); |
| 497 | } |
| 498 | |
| 499 | |
| 500 | /* |
| 501 | |
| 502 | @deftypefn Extension int strtosigno (const char *@var{name}) |
| 503 | |
| 504 | Given the symbolic name of a signal, map it to a signal number. If no |
| 505 | translation is found, returns 0. |
| 506 | |
| 507 | @end deftypefn |
| 508 | |
| 509 | */ |
| 510 | |
| 511 | int |
| 512 | strtosigno (const char *name) |
| 513 | { |
| 514 | int signo = 0; |
| 515 | |
| 516 | if (name != NULL) |
| 517 | { |
| 518 | if (signal_names == NULL) |
| 519 | { |
| 520 | init_signal_tables (); |
| 521 | } |
| 522 | for (signo = 0; signo < num_signal_names; signo++) |
| 523 | { |
| 524 | if ((signal_names[signo] != NULL) && |
| 525 | (strcmp (name, signal_names[signo]) == 0)) |
| 526 | { |
| 527 | break; |
| 528 | } |
| 529 | } |
| 530 | if (signo == num_signal_names) |
| 531 | { |
| 532 | signo = 0; |
| 533 | } |
| 534 | } |
| 535 | return (signo); |
| 536 | } |
| 537 | |
| 538 | |
| 539 | /* |
| 540 | |
| 541 | @deftypefn Supplemental void psignal (int @var{signo}, char *@var{message}) |
| 542 | |
| 543 | Print @var{message} to the standard error, followed by a colon, |
| 544 | followed by the description of the signal specified by @var{signo}, |
| 545 | followed by a newline. |
| 546 | |
| 547 | @end deftypefn |
| 548 | |
| 549 | */ |
| 550 | |
| 551 | #ifndef HAVE_PSIGNAL |
| 552 | |
| 553 | void |
| 554 | psignal (int signo, char *message) |
| 555 | { |
| 556 | if (signal_names == NULL) |
| 557 | { |
| 558 | init_signal_tables (); |
| 559 | } |
| 560 | if ((signo <= 0) || (signo >= sys_nsig)) |
| 561 | { |
| 562 | fprintf (stderr, "%s: unknown signal\n", message); |
| 563 | } |
| 564 | else |
| 565 | { |
| 566 | fprintf (stderr, "%s: %s\n", message, sys_siglist[signo]); |
| 567 | } |
| 568 | } |
| 569 | |
| 570 | #endif /* ! HAVE_PSIGNAL */ |
| 571 | |
| 572 | |
| 573 | /* A simple little main that does nothing but print all the signal translations |
| 574 | if MAIN is defined and this file is compiled and linked. */ |
| 575 | |
| 576 | #ifdef MAIN |
| 577 | |
| 578 | #include <stdio.h> |
| 579 | |
| 580 | int |
| 581 | main (void) |
| 582 | { |
| 583 | int signo; |
| 584 | int maxsigno; |
| 585 | const char *name; |
| 586 | const char *msg; |
| 587 | |
| 588 | maxsigno = signo_max (); |
| 589 | printf ("%d entries in names table.\n", num_signal_names); |
| 590 | printf ("%d entries in messages table.\n", sys_nsig); |
| 591 | printf ("%d is max useful index.\n", maxsigno); |
| 592 | |
| 593 | /* Keep printing values until we get to the end of *both* tables, not |
| 594 | *either* table. Note that knowing the maximum useful index does *not* |
| 595 | relieve us of the responsibility of testing the return pointer for |
| 596 | NULL. */ |
| 597 | |
| 598 | for (signo = 0; signo <= maxsigno; signo++) |
| 599 | { |
| 600 | name = strsigno (signo); |
| 601 | name = (name == NULL) ? "<NULL>" : name; |
| 602 | msg = strsignal (signo); |
| 603 | msg = (msg == NULL) ? "<NULL>" : msg; |
| 604 | printf ("%-4d%-18s%s\n", signo, name, msg); |
| 605 | } |
| 606 | |
| 607 | return 0; |
| 608 | } |
| 609 | |
| 610 | #endif |