lib/sig2str.c

   1 /* sig2str.c -- convert between signal names and numbers
   2
   3    Copyright (C) 2002 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2, or (at your option)
   8    any later version.
   9
  10    This program 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
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software Foundation,
  17    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19 /* Written by Paul Eggert.  */
  20
  21 #if HAVE_CONFIG_H
  22 # include <config.h>
  23 #endif
  24
  25 #include <limits.h>
  26 #include <signal.h>
  27 #include <stdlib.h>
  28 #include <stdio.h>
  29 #include <string.h>
  30
  31 #if HAVE_SYS_WAIT_H
  32 # include <sys/wait.h>
  33 #endif
  34
  35 #include "sig2str.h"
  36
  37 #ifndef SIGRTMIN
  38 # define SIGRTMIN 0
  39 # undef SIGRTMAX
  40 #endif
  41 #ifndef SIGRTMAX
  42 # define SIGRTMAX (SIGRTMIN - 1)
  43 #endif
  44
  45 #define NUMNAME(name) { SIG##name, #name }
  46
  47 /* Signal names and numbers.  Put the preferred name first.  */
  48 static struct numname { int num; char const name[8]; } numname_table[] =
  49   {
  50     /* Signals required by POSIX 1003.1-2001 base, listed in
  51        traditional numeric order.  */
  52 #ifdef SIGHUP
  53     NUMNAME (HUP),
  54 #endif
  55 #ifdef SIGINT
  56     NUMNAME (INT),
  57 #endif
  58 #ifdef SIGQUIT
  59     NUMNAME (QUIT),
  60 #endif
  61 #ifdef SIGILL
  62     NUMNAME (ILL),
  63 #endif
  64 #ifdef SIGTRAP
  65     NUMNAME (TRAP),
  66 #endif
  67 #ifdef SIGABRT
  68     NUMNAME (ABRT),
  69 #endif
  70 #ifdef SIGFPE
  71     NUMNAME (FPE),
  72 #endif
  73 #ifdef SIGKILL
  74     NUMNAME (KILL),
  75 #endif
  76 #ifdef SIGBUS
  77     NUMNAME (BUS),
  78 #endif
  79 #ifdef SIGSEGV
  80     NUMNAME (SEGV),
  81 #endif
  82 #ifdef SIGPIPE
  83     NUMNAME (PIPE),
  84 #endif
  85 #ifdef SIGALRM
  86     NUMNAME (ALRM),
  87 #endif
  88 #ifdef SIGTERM
  89     NUMNAME (TERM),
  90 #endif
  91 #ifdef SIGUSR1
  92     NUMNAME (USR1),
  93 #endif
  94 #ifdef SIGUSR2
  95     NUMNAME (USR2),
  96 #endif
  97 #ifdef SIGCHLD
  98     NUMNAME (CHLD),
  99 #endif
 100 #ifdef SIGURG
 101     NUMNAME (URG),
 102 #endif
 103 #ifdef SIGSTOP
 104     NUMNAME (STOP),
 105 #endif
 106 #ifdef SIGTSTP
 107     NUMNAME (TSTP),
 108 #endif
 109 #ifdef SIGCONT
 110     NUMNAME (CONT),
 111 #endif
 112 #ifdef SIGTTIN
 113     NUMNAME (TTIN),
 114 #endif
 115 #ifdef SIGTTOU
 116     NUMNAME (TTOU),
 117 #endif
 118
 119     /* Signals required by POSIX 1003.1-2001 with the XSI extension.  */
 120 #ifdef SIGSYS
 121     NUMNAME (SYS),
 122 #endif
 123 #ifdef SIGPOLL
 124     NUMNAME (POLL),
 125 #endif
 126 #ifdef SIGVTALRM
 127     NUMNAME (VTALRM),
 128 #endif
 129 #ifdef SIGPROF
 130     NUMNAME (PROF),
 131 #endif
 132 #ifdef SIGXCPU
 133     NUMNAME (XCPU),
 134 #endif
 135 #ifdef SIGXFSZ
 136     NUMNAME (XFSZ),
 137 #endif
 138
 139     /* Unix Version 7.  */
 140 #ifdef SIGIOT
 141     NUMNAME (IOT),      /* Older name for ABRT.  */
 142 #endif
 143 #ifdef SIGEMT
 144     NUMNAME (EMT),
 145 #endif
 146
 147     /* USG Unix.  */
 148 #ifdef SIGPHONE
 149     NUMNAME (PHONE),
 150 #endif
 151 #ifdef SIGWIND
 152     NUMNAME (WIND),
 153 #endif
 154
 155     /* Unix System V.  */
 156 #ifdef SIGCLD
 157     NUMNAME (CLD),
 158 #endif
 159 #ifdef SIGPWR
 160     NUMNAME (PWR),
 161 #endif
 162
 163     /* GNU/Linux 2.2 and Solaris 8.  */
 164 #ifdef SIGCANCEL
 165     NUMNAME (CANCEL),
 166 #endif
 167 #ifdef SIGLWP
 168     NUMNAME (LWP),
 169 #endif
 170 #ifdef SIGWAITING
 171     NUMNAME (WAITING),
 172 #endif
 173 #ifdef SIGFREEZE
 174     NUMNAME (FREEZE),
 175 #endif
 176 #ifdef SIGTHAW
 177     NUMNAME (THAW),
 178 #endif
 179 #ifdef SIGLOST
 180     NUMNAME (LOST),
 181 #endif
 182 #ifdef SIGWINCH
 183     NUMNAME (WINCH),
 184 #endif
 185
 186     /* GNU/Linux 2.2.  */
 187 #ifdef SIGINFO
 188     NUMNAME (INFO),
 189 #endif
 190 #ifdef SIGIO
 191     NUMNAME (IO),
 192 #endif
 193 #ifdef SIGSTKFLT
 194     NUMNAME (STKFLT),
 195 #endif
 196
 197     /* AIX 5L.  */
 198 #ifdef SIGDANGER
 199     NUMNAME (DANGER),
 200 #endif
 201 #ifdef SIGGRANT
 202     NUMNAME (GRANT),
 203 #endif
 204 #ifdef SIGMIGRATE
 205     NUMNAME (MIGRATE),
 206 #endif
 207 #ifdef SIGMSG
 208     NUMNAME (MSG),
 209 #endif
 210 #ifdef SIGPRE
 211     NUMNAME (PRE),
 212 #endif
 213 #ifdef SIGRETRACT
 214     NUMNAME (RETRACT),
 215 #endif
 216 #ifdef SIGSAK
 217     NUMNAME (SAK),
 218 #endif
 219 #ifdef SIGSOUND
 220     NUMNAME (SOUND),
 221 #endif
 222
 223     /* Older AIX versions.  */
 224 #ifdef SIGALRM1
 225     NUMNAME (ALRM1),    /* unknown; taken from Bash 2.05 */
 226 #endif
 227 #ifdef SIGKAP
 228     NUMNAME (KAP),      /* Older name for SIGGRANT.  */
 229 #endif
 230 #ifdef SIGVIRT
 231     NUMNAME (VIRT),     /* unknown; taken from Bash 2.05 */
 232 #endif
 233 #ifdef SIGWINDOW
 234     NUMNAME (WINDOW),   /* Older name for SIGWINCH.  */
 235 #endif
 236
 237     /* BeOS */
 238 #ifdef SIGKILLTHR
 239     NUMNAME (KILLTHR),
 240 #endif
 241
 242     /* Older HP-UX versions.  */
 243 #ifdef SIGDIL
 244     NUMNAME (DIL),
 245 #endif
 246
 247     /* Korn shell and Bash, of uncertain vintage.  */
 248     { 0, "EXIT" }
 249   };
 250
 251 #define NUMNAME_ENTRIES (sizeof numname_table / sizeof numname_table[0])
 252
 253 /* ISDIGIT differs from isdigit, as follows:
 254    - Its arg may be any int or unsigned int; it need not be an unsigned char.
 255    - It's guaranteed to evaluate its argument exactly once.
 256    - It's typically faster.
 257    POSIX says that only '0' through '9' are digits.  Prefer ISDIGIT to
 258    ISDIGIT_LOCALE unless it's important to use the locale's definition
 259    of `digit' even when the host does not conform to POSIX.  */
 260 #define ISDIGIT(c) ((unsigned) (c) - '0' <= 9)
 261
 262 /* Convert the signal name SIGNAME to a signal number.  Return the
 263    signal number if successful, -1 otherwise.  */
 264
 265 static int
 266 str2signum (char const *signame)
 267 {
 268   if (ISDIGIT (*signame))
 269     {
 270       char *endp;
 271       long int n = strtol (signame, &endp, 10);
 272       if (! *endp && n <= SIGNUM_BOUND)
 273         return n;
 274     }
 275   else
 276     {
 277       int i;
 278       for (i = 0; i < NUMNAME_ENTRIES; i++)
 279         if (strcmp (numname_table[i].name, signame) == 0)
 280           return numname_table[i].num;
 281
 282       {
 283         char *endp;
 284         int rtmin = SIGRTMIN;
 285         int rtmax = SIGRTMAX;
 286
 287         if (0 < rtmin && strncmp (signame, "RTMIN", 5) == 0)
 288           {
 289             long int n = strtol (signame + 5, &endp, 10);
 290             if (! *endp && 0 <= n && n <= rtmax - rtmin)
 291               return rtmin + n;
 292           }
 293         else if (0 < rtmax && strncmp (signame, "RTMAX", 5) == 0)
 294           {
 295             long int n = strtol (signame + 5, &endp, 10);
 296             if (! *endp && rtmin - rtmax <= n && n <= 0)
 297               return rtmax + n;
 298           }
 299       }
 300     }
 301
 302   return -1;
 303 }
 304
 305 /* Convert the signal name SIGNAME to the signal number *SIGNUM.
 306    Return 0 if successful, -1 otherwise.  */
 307
 308 int
 309 str2sig (char const *signame, int *signum)
 310 {
 311   *signum = str2signum (signame);
 312   return *signum < 0 ? -1 : 0;
 313 }
 314
 315 /* Convert SIGNUM to a signal name in SIGNAME.  SIGNAME must point to
 316    a buffer of at least SIG2STR_MAX bytes.  Return 0 if successful, -1
 317    otherwise.  */
 318
 319 int
 320 sig2str (int signum, char *signame)
 321 {
 322   int i;
 323   for (i = 0; i < NUMNAME_ENTRIES; i++)
 324     if (numname_table[i].num == signum)
 325       {
 326         strcpy (signame, numname_table[i].name);
 327         return 0;
 328       }
 329
 330   {
 331     int rtmin = SIGRTMIN;
 332     int rtmax = SIGRTMAX;
 333
 334     if (! (rtmin <= signum && signum <= rtmax))
 335       return -1;
 336
 337     if (signum <= rtmin + (rtmax - rtmin) / 2)
 338       {
 339         int delta = signum - rtmin;
 340         sprintf (signame, delta ? "RTMIN+%d" : "RTMIN", delta);
 341       }
 342     else
 343       {
 344         int delta = rtmax - signum;
 345         sprintf (signame, delta ? "RTMAX-%d" : "RTMAX", delta);
 346       }
 347
 348     return 0;
 349   }
 350 }