signame.c

   1 /* Convert between signal names and numbers.
   2    Copyright (C) 1990, 1992, 1993, 1995, 1996 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include "make.h"
  21
  22 #include <stdio.h>
  23 #include <sys/types.h>          /* Some systems need this for <signal.h>.  */
  24 #include <signal.h>
  25
  26 #ifdef HAVE_STRING_H
  27 #include <string.h>
  28 #endif
  29
  30 /* Some systems declare `sys_siglist in <unistd.h>; if
  31    configure defined SYS_SIGLIST_DECLARED, it may expect
  32    to find the declaration there.  */
  33 #ifdef HAVE_UNISTD_H
  34 #include <unistd.h>
  35 #endif
  36
  37
  38 /* Some systems do not define NSIG in <signal.h>.  */
  39 #ifndef NSIG
  40 #ifdef  _NSIG
  41 #define NSIG    _NSIG
  42 #else
  43 #define NSIG    32
  44 #endif
  45 #endif
  46
  47 #if !__STDC__
  48 #define const
  49 #endif
  50
  51 #include "signame.h"
  52
  53 #ifndef HAVE_SYS_SIGLIST
  54 /* There is too much variation in Sys V signal numbers and names, so
  55    we must initialize them at runtime.  */
  56
  57 static const char *undoc;
  58
  59 const char *sys_siglist[NSIG];
  60
  61 #else   /* HAVE_SYS_SIGLIST.  */
  62
  63 #ifndef SYS_SIGLIST_DECLARED
  64 extern char *sys_siglist[];
  65 #endif  /* Not SYS_SIGLIST_DECLARED.  */
  66
  67 #endif  /* Not HAVE_SYS_SIGLIST.  */
  68
  69 /* Table of abbreviations for signals.  Note:  A given number can
  70    appear more than once with different abbreviations.  */
  71 #define SIG_TABLE_SIZE  (NSIG*2)
  72
  73 typedef struct
  74   {
  75     int number;
  76     const char *abbrev;
  77   } num_abbrev;
  78 static num_abbrev sig_table[SIG_TABLE_SIZE];
  79 /* Number of elements of sig_table used.  */
  80 static int sig_table_nelts = 0;
  81
  82 /* Enter signal number NUMBER into the tables with ABBREV and NAME.  */
  83
  84 static void
  85 init_sig (number, abbrev, name)
  86      int number;
  87      const char *abbrev;
  88      const char *name;
  89 {
  90 #ifndef HAVE_SYS_SIGLIST
  91   /* If this value is ever greater than NSIG it seems like it'd be a bug in
  92      the system headers, but... better safe than sorry.  We know, for
  93      example, that this isn't always true on VMS.  */
  94
  95   if (number >= 0 && number < NSIG)
  96     sys_siglist[number] = name;
  97 #endif
  98   if (sig_table_nelts < SIG_TABLE_SIZE)
  99     {
 100       sig_table[sig_table_nelts].number = number;
 101       sig_table[sig_table_nelts++].abbrev = abbrev;
 102     }
 103 }
 104
 105 void
 106 signame_init ()
 107 {
 108 #ifndef HAVE_SYS_SIGLIST
 109   int i;
 110   char *u = _("unknown signal");
 111
 112   undoc = xstrdup(u);
 113
 114   /* Initialize signal names.  */
 115   for (i = 0; i < NSIG; i++)
 116     sys_siglist[i] = undoc;
 117 #endif /* !HAVE_SYS_SIGLIST */
 118
 119   /* Initialize signal names.  */
 120 #if defined (SIGHUP)
 121   init_sig (SIGHUP, "HUP", _("Hangup"));
 122 #endif
 123 #if defined (SIGINT)
 124   init_sig (SIGINT, "INT", _("Interrupt"));
 125 #endif
 126 #if defined (SIGQUIT)
 127   init_sig (SIGQUIT, "QUIT", _("Quit"));
 128 #endif
 129 #if defined (SIGILL)
 130   init_sig (SIGILL, "ILL", _("Illegal Instruction"));
 131 #endif
 132 #if defined (SIGTRAP)
 133   init_sig (SIGTRAP, "TRAP", _("Trace/breakpoint trap"));
 134 #endif
 135   /* If SIGIOT == SIGABRT, we want to print it as SIGABRT because
 136      SIGABRT is in ANSI and POSIX.1 and SIGIOT isn't.  */
 137 #if defined (SIGABRT)
 138   init_sig (SIGABRT, "ABRT", _("Aborted"));
 139 #endif
 140 #if defined (SIGIOT)
 141   init_sig (SIGIOT, "IOT", _("IOT trap"));
 142 #endif
 143 #if defined (SIGEMT)
 144   init_sig (SIGEMT, "EMT", _("EMT trap"));
 145 #endif
 146 #if defined (SIGFPE)
 147   init_sig (SIGFPE, "FPE", _("Floating point exception"));
 148 #endif
 149 #if defined (SIGKILL)
 150   init_sig (SIGKILL, "KILL", _("Killed"));
 151 #endif
 152 #if defined (SIGBUS)
 153   init_sig (SIGBUS, "BUS", _("Bus error"));
 154 #endif
 155 #if defined (SIGSEGV)
 156   init_sig (SIGSEGV, "SEGV", _("Segmentation fault"));
 157 #endif
 158 #if defined (SIGSYS)
 159   init_sig (SIGSYS, "SYS", _("Bad system call"));
 160 #endif
 161 #if defined (SIGPIPE)
 162   init_sig (SIGPIPE, "PIPE", _("Broken pipe"));
 163 #endif
 164 #if defined (SIGALRM)
 165   init_sig (SIGALRM, "ALRM", _("Alarm clock"));
 166 #endif
 167 #if defined (SIGTERM)
 168   init_sig (SIGTERM, "TERM", _("Terminated"));
 169 #endif
 170 #if defined (SIGUSR1)
 171   init_sig (SIGUSR1, "USR1", _("User defined signal 1"));
 172 #endif
 173 #if defined (SIGUSR2)
 174   init_sig (SIGUSR2, "USR2", _("User defined signal 2"));
 175 #endif
 176   /* If SIGCLD == SIGCHLD, we want to print it as SIGCHLD because that
 177      is what is in POSIX.1.  */
 178 #if defined (SIGCHLD)
 179   init_sig (SIGCHLD, "CHLD", _("Child exited"));
 180 #endif
 181 #if defined (SIGCLD)
 182   init_sig (SIGCLD, "CLD", _("Child exited"));
 183 #endif
 184 #if defined (SIGPWR)
 185   init_sig (SIGPWR, "PWR", _("Power failure"));
 186 #endif
 187 #if defined (SIGTSTP)
 188   init_sig (SIGTSTP, "TSTP", _("Stopped"));
 189 #endif
 190 #if defined (SIGTTIN)
 191   init_sig (SIGTTIN, "TTIN", _("Stopped (tty input)"));
 192 #endif
 193 #if defined (SIGTTOU)
 194   init_sig (SIGTTOU, "TTOU", _("Stopped (tty output)"));
 195 #endif
 196 #if defined (SIGSTOP)
 197   init_sig (SIGSTOP, "STOP", _("Stopped (signal)"));
 198 #endif
 199 #if defined (SIGXCPU)
 200   init_sig (SIGXCPU, "XCPU", _("CPU time limit exceeded"));
 201 #endif
 202 #if defined (SIGXFSZ)
 203   init_sig (SIGXFSZ, "XFSZ", _("File size limit exceeded"));
 204 #endif
 205 #if defined (SIGVTALRM)
 206   init_sig (SIGVTALRM, "VTALRM", _("Virtual timer expired"));
 207 #endif
 208 #if defined (SIGPROF)
 209   init_sig (SIGPROF, "PROF", _("Profiling timer expired"));
 210 #endif
 211 #if defined (SIGWINCH)
 212   /* "Window size changed" might be more accurate, but even if that
 213      is all that it means now, perhaps in the future it will be
 214      extended to cover other kinds of window changes.  */
 215   init_sig (SIGWINCH, "WINCH", _("Window changed"));
 216 #endif
 217 #if defined (SIGCONT)
 218   init_sig (SIGCONT, "CONT", _("Continued"));
 219 #endif
 220 #if defined (SIGURG)
 221   init_sig (SIGURG, "URG", _("Urgent I/O condition"));
 222 #endif
 223 #if defined (SIGIO)
 224   /* "I/O pending" has also been suggested.  A disadvantage is
 225      that signal only happens when the process has
 226      asked for it, not everytime I/O is pending.  Another disadvantage
 227      is the confusion from giving it a different name than under Unix.  */
 228   init_sig (SIGIO, "IO", _("I/O possible"));
 229 #endif
 230 #if defined (SIGWIND)
 231   init_sig (SIGWIND, "WIND", _("SIGWIND"));
 232 #endif
 233 #if defined (SIGPHONE)
 234   init_sig (SIGPHONE, "PHONE", _("SIGPHONE"));
 235 #endif
 236 #if defined (SIGPOLL)
 237   init_sig (SIGPOLL, "POLL", _("I/O possible"));
 238 #endif
 239 #if defined (SIGLOST)
 240   init_sig (SIGLOST, "LOST", _("Resource lost"));
 241 #endif
 242 #if defined (SIGDANGER)
 243   init_sig (SIGDANGER, "DANGER", _("Danger signal"));
 244 #endif
 245 #if defined (SIGINFO)
 246   init_sig (SIGINFO, "INFO", _("Information request"));
 247 #endif
 248 #if defined (SIGNOFP)
 249   init_sig (SIGNOFP, "NOFP", _("Floating point co-processor not available"));
 250 #endif
 251 }
 252
 253 /* Return the abbreviation for signal NUMBER.  */
 254
 255 char *
 256 sig_abbrev (number)
 257      int number;
 258 {
 259   int i;
 260
 261   if (sig_table_nelts == 0)
 262     signame_init ();
 263
 264   for (i = 0; i < sig_table_nelts; i++)
 265     if (sig_table[i].number == number)
 266       return (char *)sig_table[i].abbrev;
 267   return NULL;
 268 }
 269
 270 /* Return the signal number for an ABBREV, or -1 if there is no
 271    signal by that name.  */
 272
 273 int
 274 sig_number (abbrev)
 275      const char *abbrev;
 276 {
 277   int i;
 278
 279   if (sig_table_nelts == 0)
 280     signame_init ();
 281
 282   /* Skip over "SIG" if present.  */
 283   if (abbrev[0] == 'S' && abbrev[1] == 'I' && abbrev[2] == 'G')
 284     abbrev += 3;
 285
 286   for (i = 0; i < sig_table_nelts; i++)
 287     if (abbrev[0] == sig_table[i].abbrev[0]
 288         && strcmp (abbrev, sig_table[i].abbrev) == 0)
 289       return sig_table[i].number;
 290   return -1;
 291 }
 292
 293 #ifndef HAVE_PSIGNAL
 294 /* Print to standard error the name of SIGNAL, preceded by MESSAGE and
 295    a colon, and followed by a newline.  */
 296
 297 void
 298 psignal (signal, message)
 299      int signal;
 300      const char *message;
 301 {
 302   if (signal <= 0 || signal >= NSIG)
 303     fprintf (stderr, "%s: unknown signal", message);
 304   else
 305     fprintf (stderr, "%s: %s\n", message, sys_siglist[signal]);
 306 }
 307 #endif
 308
 309 #ifndef HAVE_STRSIGNAL
 310 /* Return the string associated with the signal number.  */
 311
 312 char *
 313 strsignal (signal)
 314      int signal;
 315 {
 316   static char buf[] = "Signal 12345678901234567890";
 317
 318   if (signal > 0 || signal < NSIG)
 319     return (char *) sys_siglist[signal];
 320
 321   sprintf (buf, "Signal %d", signal);
 322   return buf;
 323 }
 324 #endif