support/signames.c

   1 /* signames.c -- Create an array of signal names. */
   2
   3 /* Copyright (C) 2006 Free Software Foundation, Inc.
   4
   5    This file is part of GNU Bash, the Bourne Again SHell.
   6
   7    Bash is free software; you can redistribute it and/or modify it under
   8    the terms of the GNU General Public License as published by the Free
   9    Software Foundation; either version 2, or (at your option) any later
  10    version.
  11
  12    Bash is distributed in the hope that it will be useful, but WITHOUT ANY
  13    WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15    for more details.
  16
  17    You should have received a copy of the GNU General Public License along
  18    with Bash; see the file COPYING.  If not, write to the Free Software
  19    Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
  20
  21 #include <config.h>
  22
  23 #include <stdio.h>
  24
  25 #include <sys/types.h>
  26 #include <signal.h>
  27
  28 #if defined (HAVE_STDLIB_H)
  29 #  include <stdlib.h>
  30 #else
  31 #  include "ansi_stdlib.h"
  32 #endif /* HAVE_STDLIB_H */
  33
  34 #if !defined (NSIG)
  35 #  define NSIG 64
  36 #endif
  37
  38 /*
  39  * Special traps:
  40  *      EXIT == 0
  41  *      DEBUG == NSIG
  42  *      ERR == NSIG+1
  43  *      RETURN == NSIG+2
  44  */
  45 #define LASTSIG NSIG+2
  46
  47 char *signal_names[2 * (LASTSIG)];
  48
  49 #define signal_names_size (sizeof(signal_names)/sizeof(signal_names[0]))
  50
  51 /* AIX 4.3 defines SIGRTMIN and SIGRTMAX as 888 and 999 respectively.
  52    I don't want to allocate so much unused space for the intervening signal
  53    numbers, so we just punt if SIGRTMAX is past the bounds of the
  54    signal_names array (handled in configure). */
  55 #if defined (SIGRTMAX) && defined (UNUSABLE_RT_SIGNALS)
  56 #  undef SIGRTMAX
  57 #  undef SIGRTMIN
  58 #endif
  59
  60 #if defined (SIGRTMAX) || defined (SIGRTMIN)
  61 #  define RTLEN 14
  62 #  define RTLIM 256
  63 #endif
  64
  65 #if defined (BUILDTOOL)
  66 extern char *progname;
  67 #endif
  68
  69 void
  70 initialize_signames ()
  71 {
  72   register int i;
  73 #if defined (SIGRTMAX) || defined (SIGRTMIN)
  74   int rtmin, rtmax, rtcnt;
  75 #endif
  76
  77   for (i = 1; i < signal_names_size; i++)
  78     signal_names[i] = (char *)NULL;
  79
  80   /* `signal' 0 is what we do on exit. */
  81   signal_names[0] = "EXIT";
  82
  83   /* Place signal names which can be aliases for more common signal
  84      names first.  This allows (for example) SIGABRT to overwrite SIGLOST. */
  85
  86   /* POSIX 1003.1b-1993 real time signals, but take care of incomplete
  87      implementations. Acoording to the standard, both, SIGRTMIN and
  88      SIGRTMAX must be defined, SIGRTMIN must be stricly less than
  89      SIGRTMAX, and the difference must be at least 7, that is, there
  90      must be at least eight distinct real time signals. */
  91
  92   /* The generated signal names are SIGRTMIN, SIGRTMIN+1, ...,
  93      SIGRTMIN+x, SIGRTMAX-x, ..., SIGRTMAX-1, SIGRTMAX. If the number
  94      of RT signals is odd, there is an extra SIGRTMIN+(x+1).
  95      These names are the ones used by ksh and /usr/xpg4/bin/sh on SunOS5. */
  96
  97 #if defined (SIGRTMIN)
  98   rtmin = SIGRTMIN;
  99   signal_names[rtmin] = "SIGRTMIN";
 100 #endif
 101
 102 #if defined (SIGRTMAX)
 103   rtmax = SIGRTMAX;
 104   signal_names[rtmax] = "SIGRTMAX";
 105 #endif
 106
 107 #if defined (SIGRTMAX) && defined (SIGRTMIN)
 108   if (rtmax > rtmin)
 109     {
 110       rtcnt = (rtmax - rtmin - 1) / 2;
 111       /* croak if there are too many RT signals */
 112       if (rtcnt >= RTLIM/2)
 113         {
 114           rtcnt = RTLIM/2-1;
 115 #ifdef BUILDTOOL
 116           fprintf(stderr, "%s: error: more than %d real time signals, fix `%s'\n",
 117                   progname, RTLIM, progname);
 118 #endif
 119         }
 120
 121       for (i = 1; i <= rtcnt; i++)
 122         {
 123           signal_names[rtmin+i] = (char *)malloc(RTLEN);
 124           if (signal_names[rtmin+i])
 125             sprintf (signal_names[rtmin+i], "SIGRTMIN+%d", i);
 126           signal_names[rtmax-i] = (char *)malloc(RTLEN);
 127           if (signal_names[rtmax-i])
 128             sprintf (signal_names[rtmax-i], "SIGRTMAX-%d", i);
 129         }
 130
 131       if (rtcnt < RTLIM/2-1 && rtcnt != (rtmax-rtmin)/2)
 132         {
 133           /* Need an extra RTMIN signal */
 134           signal_names[rtmin+rtcnt+1] = (char *)malloc(RTLEN);
 135           if (signal_names[rtmin+rtcnt+1])
 136             sprintf (signal_names[rtmin+rtcnt+1], "SIGRTMIN+%d", rtcnt+1);
 137         }
 138     }
 139 #endif /* SIGRTMIN && SIGRTMAX */
 140
 141 #if defined (SIGLOST)   /* resource lost (eg, record-lock lost) */
 142   signal_names[SIGLOST] = "SIGLOST";
 143 #endif
 144
 145 /* AIX */
 146 #if defined (SIGMSG)    /* HFT input data pending */
 147   signal_names[SIGMSG] = "SIGMSG";
 148 #endif
 149
 150 #if defined (SIGDANGER) /* system crash imminent */
 151   signal_names[SIGDANGER] = "SIGDANGER";
 152 #endif
 153
 154 #if defined (SIGMIGRATE) /* migrate process to another CPU */
 155   signal_names[SIGMIGRATE] = "SIGMIGRATE";
 156 #endif
 157
 158 #if defined (SIGPRE)    /* programming error */
 159   signal_names[SIGPRE] = "SIGPRE";
 160 #endif
 161
 162 #if defined (SIGVIRT)   /* AIX virtual time alarm */
 163   signal_names[SIGVIRT] = "SIGVIRT";
 164 #endif
 165
 166 #if defined (SIGALRM1)  /* m:n condition variables */
 167   signal_names[SIGALRM1] = "SIGALRM1";
 168 #endif
 169
 170 #if defined (SIGWAITING)        /* m:n scheduling */
 171   signal_names[SIGWAITING] = "SIGWAITING";
 172 #endif
 173
 174 #if defined (SIGGRANT)  /* HFT monitor mode granted */
 175   signal_names[SIGGRANT] = "SIGGRANT";
 176 #endif
 177
 178 #if defined (SIGKAP)    /* keep alive poll from native keyboard */
 179   signal_names[SIGKAP] = "SIGKAP";
 180 #endif
 181
 182 #if defined (SIGRETRACT) /* HFT monitor mode retracted */
 183   signal_names[SIGRETRACT] = "SIGRETRACT";
 184 #endif
 185
 186 #if defined (SIGSOUND)  /* HFT sound sequence has completed */
 187   signal_names[SIGSOUND] = "SIGSOUND";
 188 #endif
 189
 190 #if defined (SIGSAK)    /* Secure Attention Key */
 191   signal_names[SIGSAK] = "SIGSAK";
 192 #endif
 193
 194 /* SunOS5 */
 195 #if defined (SIGLWP)    /* special signal used by thread library */
 196   signal_names[SIGLWP] = "SIGLWP";
 197 #endif
 198
 199 #if defined (SIGFREEZE) /* special signal used by CPR */
 200   signal_names[SIGFREEZE] = "SIGFREEZE";
 201 #endif
 202
 203 #if defined (SIGTHAW)   /* special signal used by CPR */
 204   signal_names[SIGTHAW] = "SIGTHAW";
 205 #endif
 206
 207 #if defined (SIGCANCEL) /* thread cancellation signal used by libthread */
 208   signal_names[SIGCANCEL] = "SIGCANCEL";
 209 #endif
 210
 211 #if defined (SIGXRES)   /* resource control exceeded */
 212   signal_names[SIGXRES] = "SIGXRES";
 213 #endif
 214
 215 /* HP-UX */
 216 #if defined (SIGDIL)    /* DIL signal (?) */
 217   signal_names[SIGDIL] = "SIGDIL";
 218 #endif
 219
 220 /* System V */
 221 #if defined (SIGCLD)    /* Like SIGCHLD.  */
 222   signal_names[SIGCLD] = "SIGCLD";
 223 #endif
 224
 225 #if defined (SIGPWR)    /* power state indication */
 226   signal_names[SIGPWR] = "SIGPWR";
 227 #endif
 228
 229 #if defined (SIGPOLL)   /* Pollable event (for streams)  */
 230   signal_names[SIGPOLL] = "SIGPOLL";
 231 #endif
 232
 233 /* Unknown */
 234 #if defined (SIGWINDOW)
 235   signal_names[SIGWINDOW] = "SIGWINDOW";
 236 #endif
 237
 238 /* Linux */
 239 #if defined (SIGSTKFLT)
 240   signal_names[SIGSTKFLT] = "SIGSTKFLT";
 241 #endif
 242
 243 /* FreeBSD */
 244 #if defined (SIGTHR)    /* thread interrupt */
 245   signal_names[SIGTHR] = "SIGTHR";
 246 #endif
 247
 248 /* Common */
 249 #if defined (SIGHUP)    /* hangup */
 250   signal_names[SIGHUP] = "SIGHUP";
 251 #endif
 252
 253 #if defined (SIGINT)    /* interrupt */
 254   signal_names[SIGINT] = "SIGINT";
 255 #endif
 256
 257 #if defined (SIGQUIT)   /* quit */
 258   signal_names[SIGQUIT] = "SIGQUIT";
 259 #endif
 260
 261 #if defined (SIGILL)    /* illegal instruction (not reset when caught) */
 262   signal_names[SIGILL] = "SIGILL";
 263 #endif
 264
 265 #if defined (SIGTRAP)   /* trace trap (not reset when caught) */
 266   signal_names[SIGTRAP] = "SIGTRAP";
 267 #endif
 268
 269 #if defined (SIGIOT)    /* IOT instruction */
 270   signal_names[SIGIOT] = "SIGIOT";
 271 #endif
 272
 273 #if defined (SIGABRT)   /* Cause current process to dump core. */
 274   signal_names[SIGABRT] = "SIGABRT";
 275 #endif
 276
 277 #if defined (SIGEMT)    /* EMT instruction */
 278   signal_names[SIGEMT] = "SIGEMT";
 279 #endif
 280
 281 #if defined (SIGFPE)    /* floating point exception */
 282   signal_names[SIGFPE] = "SIGFPE";
 283 #endif
 284
 285 #if defined (SIGKILL)   /* kill (cannot be caught or ignored) */
 286   signal_names[SIGKILL] = "SIGKILL";
 287 #endif
 288
 289 #if defined (SIGBUS)    /* bus error */
 290   signal_names[SIGBUS] = "SIGBUS";
 291 #endif
 292
 293 #if defined (SIGSEGV)   /* segmentation violation */
 294   signal_names[SIGSEGV] = "SIGSEGV";
 295 #endif
 296
 297 #if defined (SIGSYS)    /* bad argument to system call */
 298   signal_names[SIGSYS] = "SIGSYS";
 299 #endif
 300
 301 #if defined (SIGPIPE)   /* write on a pipe with no one to read it */
 302   signal_names[SIGPIPE] = "SIGPIPE";
 303 #endif
 304
 305 #if defined (SIGALRM)   /* alarm clock */
 306   signal_names[SIGALRM] = "SIGALRM";
 307 #endif
 308
 309 #if defined (SIGTERM)   /* software termination signal from kill */
 310   signal_names[SIGTERM] = "SIGTERM";
 311 #endif
 312
 313 #if defined (SIGURG)    /* urgent condition on IO channel */
 314   signal_names[SIGURG] = "SIGURG";
 315 #endif
 316
 317 #if defined (SIGSTOP)   /* sendable stop signal not from tty */
 318   signal_names[SIGSTOP] = "SIGSTOP";
 319 #endif
 320
 321 #if defined (SIGTSTP)   /* stop signal from tty */
 322   signal_names[SIGTSTP] = "SIGTSTP";
 323 #endif
 324
 325 #if defined (SIGCONT)   /* continue a stopped process */
 326   signal_names[SIGCONT] = "SIGCONT";
 327 #endif
 328
 329 #if defined (SIGCHLD)   /* to parent on child stop or exit */
 330   signal_names[SIGCHLD] = "SIGCHLD";
 331 #endif
 332
 333 #if defined (SIGTTIN)   /* to readers pgrp upon background tty read */
 334   signal_names[SIGTTIN] = "SIGTTIN";
 335 #endif
 336
 337 #if defined (SIGTTOU)   /* like TTIN for output if (tp->t_local&LTOSTOP) */
 338   signal_names[SIGTTOU] = "SIGTTOU";
 339 #endif
 340
 341 #if defined (SIGIO)     /* input/output possible signal */
 342   signal_names[SIGIO] = "SIGIO";
 343 #endif
 344
 345 #if defined (SIGXCPU)   /* exceeded CPU time limit */
 346   signal_names[SIGXCPU] = "SIGXCPU";
 347 #endif
 348
 349 #if defined (SIGXFSZ)   /* exceeded file size limit */
 350   signal_names[SIGXFSZ] = "SIGXFSZ";
 351 #endif
 352
 353 #if defined (SIGVTALRM) /* virtual time alarm */
 354   signal_names[SIGVTALRM] = "SIGVTALRM";
 355 #endif
 356
 357 #if defined (SIGPROF)   /* profiling time alarm */
 358   signal_names[SIGPROF] = "SIGPROF";
 359 #endif
 360
 361 #if defined (SIGWINCH)  /* window changed */
 362   signal_names[SIGWINCH] = "SIGWINCH";
 363 #endif
 364
 365 /* 4.4 BSD */
 366 #if defined (SIGINFO) && !defined (_SEQUENT_)   /* information request */
 367   signal_names[SIGINFO] = "SIGINFO";
 368 #endif
 369
 370 #if defined (SIGUSR1)   /* user defined signal 1 */
 371   signal_names[SIGUSR1] = "SIGUSR1";
 372 #endif
 373
 374 #if defined (SIGUSR2)   /* user defined signal 2 */
 375   signal_names[SIGUSR2] = "SIGUSR2";
 376 #endif
 377
 378 #if defined (SIGKILLTHR)        /* BeOS: Kill Thread */
 379   signal_names[SIGKILLTHR] = "SIGKILLTHR";
 380 #endif
 381
 382   for (i = 0; i < NSIG; i++)
 383     if (signal_names[i] == (char *)NULL)
 384       {
 385         signal_names[i] = (char *)malloc (18);
 386         if (signal_names[i])
 387           sprintf (signal_names[i], "SIGJUNK(%d)", i);
 388       }
 389
 390   signal_names[NSIG] = "DEBUG";
 391   signal_names[NSIG+1] = "ERR";
 392   signal_names[NSIG+2] = "RETURN";
 393 }