lib/sig2str.c

   1 /* sig2str.c -- convert between signal names and numbers
   2
   3    Copyright (C) 2002, 2004, 2006, 2009-2020 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 3 of the License, or
   8    (at your option) 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, see <https://www.gnu.org/licenses/>.  */
  17
  18 /* Written by Paul Eggert.  */
  19
  20 #include <config.h>
  21
  22 #include <limits.h>
  23 #include <signal.h>
  24 #include <stdlib.h>
  25 #include <stdio.h>
  26 #include <string.h>
  27
  28 #include "sig2str.h"
  29
  30 #ifndef SIGRTMIN
  31 # define SIGRTMIN 0
  32 # undef SIGRTMAX
  33 #endif
  34 #ifndef SIGRTMAX
  35 # define SIGRTMAX (SIGRTMIN - 1)
  36 #endif
  37
  38 #define NUMNAME(name) { SIG##name, #name }
  39
  40 /* Signal names and numbers.  Put the preferred name first.  */
  41 static struct numname { int num; char const name[8]; } numname_table[] =
  42   {
  43     /* Signals required by POSIX 1003.1-2001 base, listed in
  44        traditional numeric order where possible.  */
  45 #ifdef SIGHUP
  46     NUMNAME (HUP),
  47 #endif
  48 #ifdef SIGINT
  49     NUMNAME (INT),
  50 #endif
  51 #ifdef SIGQUIT
  52     NUMNAME (QUIT),
  53 #endif
  54 #ifdef SIGILL
  55     NUMNAME (ILL),
  56 #endif
  57 #ifdef SIGTRAP
  58     NUMNAME (TRAP),
  59 #endif
  60 #ifdef SIGABRT
  61     NUMNAME (ABRT),
  62 #endif
  63 #ifdef SIGFPE
  64     NUMNAME (FPE),
  65 #endif
  66 #ifdef SIGKILL
  67     NUMNAME (KILL),
  68 #endif
  69 #ifdef SIGSEGV
  70     NUMNAME (SEGV),
  71 #endif
  72     /* On Haiku, SIGSEGV == SIGBUS, but we prefer SIGSEGV to match
  73        strsignal.c output, so SIGBUS must be listed second.  */
  74 #ifdef SIGBUS
  75     NUMNAME (BUS),
  76 #endif
  77 #ifdef SIGPIPE
  78     NUMNAME (PIPE),
  79 #endif
  80 #ifdef SIGALRM
  81     NUMNAME (ALRM),
  82 #endif
  83 #ifdef SIGTERM
  84     NUMNAME (TERM),
  85 #endif
  86 #ifdef SIGUSR1
  87     NUMNAME (USR1),
  88 #endif
  89 #ifdef SIGUSR2
  90     NUMNAME (USR2),
  91 #endif
  92 #ifdef SIGCHLD
  93     NUMNAME (CHLD),
  94 #endif
  95 #ifdef SIGURG
  96     NUMNAME (URG),
  97 #endif
  98 #ifdef SIGSTOP
  99     NUMNAME (STOP),
 100 #endif
 101 #ifdef SIGTSTP
 102     NUMNAME (TSTP),
 103 #endif
 104 #ifdef SIGCONT
 105     NUMNAME (CONT),
 106 #endif
 107 #ifdef SIGTTIN
 108     NUMNAME (TTIN),
 109 #endif
 110 #ifdef SIGTTOU
 111     NUMNAME (TTOU),
 112 #endif
 113
 114     /* Signals required by POSIX 1003.1-2001 with the XSI extension.  */
 115 #ifdef SIGSYS
 116     NUMNAME (SYS),
 117 #endif
 118 #ifdef SIGPOLL
 119     NUMNAME (POLL),
 120 #endif
 121 #ifdef SIGVTALRM
 122     NUMNAME (VTALRM),
 123 #endif
 124 #ifdef SIGPROF
 125     NUMNAME (PROF),
 126 #endif
 127 #ifdef SIGXCPU
 128     NUMNAME (XCPU),
 129 #endif
 130 #ifdef SIGXFSZ
 131     NUMNAME (XFSZ),
 132 #endif
 133
 134     /* Unix Version 7.  */
 135 #ifdef SIGIOT
 136     NUMNAME (IOT),      /* Older name for ABRT.  */
 137 #endif
 138 #ifdef SIGEMT
 139     NUMNAME (EMT),
 140 #endif
 141
 142     /* USG Unix.  */
 143 #ifdef SIGPHONE
 144     NUMNAME (PHONE),
 145 #endif
 146 #ifdef SIGWIND
 147     NUMNAME (WIND),
 148 #endif
 149
 150     /* Unix System V.  */
 151 #ifdef SIGCLD
 152     NUMNAME (CLD),
 153 #endif
 154 #ifdef SIGPWR
 155     NUMNAME (PWR),
 156 #endif
 157
 158     /* GNU/Linux 2.2 and Solaris 8.  */
 159 #ifdef SIGCANCEL
 160     NUMNAME (CANCEL),
 161 #endif
 162 #ifdef SIGLWP
 163     NUMNAME (LWP),
 164 #endif
 165 #ifdef SIGWAITING
 166     NUMNAME (WAITING),
 167 #endif
 168 #ifdef SIGFREEZE
 169     NUMNAME (FREEZE),
 170 #endif
 171 #ifdef SIGTHAW
 172     NUMNAME (THAW),
 173 #endif
 174 #ifdef SIGLOST
 175     NUMNAME (LOST),
 176 #endif
 177 #ifdef SIGWINCH
 178     NUMNAME (WINCH),
 179 #endif
 180
 181     /* GNU/Linux 2.2.  */
 182 #ifdef SIGINFO
 183     NUMNAME (INFO),
 184 #endif
 185 #ifdef SIGIO
 186     NUMNAME (IO),
 187 #endif
 188 #ifdef SIGSTKFLT
 189     NUMNAME (STKFLT),
 190 #endif
 191
 192     /* AIX 7.  */
 193 #ifdef SIGCPUFAIL
 194     NUMNAME (CPUFAIL),
 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     /* OpenBSD.  */
 238 #ifdef SIGTHR
 239     NUMNAME (THR),
 240 #endif
 241
 242     /* BeOS, Haiku */
 243 #ifdef SIGKILLTHR
 244     NUMNAME (KILLTHR),
 245 #endif
 246
 247     /* Older HP-UX versions.  */
 248 #ifdef SIGDIL
 249     NUMNAME (DIL),
 250 #endif
 251
 252     /* native Windows */
 253 #ifdef SIGBREAK
 254     NUMNAME (BREAK),
 255 #endif
 256
 257     /* Korn shell and Bash, of uncertain vintage.  */
 258     { 0, "EXIT" }
 259   };
 260
 261 #define NUMNAME_ENTRIES (sizeof numname_table / sizeof numname_table[0])
 262
 263 /* ISDIGIT differs from isdigit, as follows:
 264    - Its arg may be any int or unsigned int; it need not be an unsigned char
 265      or EOF.
 266    - It's typically faster.
 267    POSIX says that only '0' through '9' are digits.  Prefer ISDIGIT to
 268    isdigit unless it's important to use the locale's definition
 269    of "digit" even when the host does not conform to POSIX.  */
 270 #define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
 271
 272 /* Convert the signal name SIGNAME to a signal number.  Return the
 273    signal number if successful, -1 otherwise.  */
 274
 275 static int
 276 str2signum (char const *signame)
 277 {
 278   if (ISDIGIT (*signame))
 279     {
 280       char *endp;
 281       long int n = strtol (signame, &endp, 10);
 282       if (! *endp && n <= SIGNUM_BOUND)
 283         return n;
 284     }
 285   else
 286     {
 287       unsigned int i;
 288       for (i = 0; i < NUMNAME_ENTRIES; i++)
 289         if (strcmp (numname_table[i].name, signame) == 0)
 290           return numname_table[i].num;
 291
 292       {
 293         char *endp;
 294         int rtmin = SIGRTMIN;
 295         int rtmax = SIGRTMAX;
 296
 297         if (0 < rtmin && strncmp (signame, "RTMIN", 5) == 0)
 298           {
 299             long int n = strtol (signame + 5, &endp, 10);
 300             if (! *endp && 0 <= n && n <= rtmax - rtmin)
 301               return rtmin + n;
 302           }
 303         else if (0 < rtmax && strncmp (signame, "RTMAX", 5) == 0)
 304           {
 305             long int n = strtol (signame + 5, &endp, 10);
 306             if (! *endp && rtmin - rtmax <= n && n <= 0)
 307               return rtmax + n;
 308           }
 309       }
 310     }
 311
 312   return -1;
 313 }
 314
 315 /* Convert the signal name SIGNAME to the signal number *SIGNUM.
 316    Return 0 if successful, -1 otherwise.  */
 317
 318 int
 319 str2sig (char const *signame, int *signum)
 320 {
 321   *signum = str2signum (signame);
 322   return *signum < 0 ? -1 : 0;
 323 }
 324
 325 /* Convert SIGNUM to a signal name in SIGNAME.  SIGNAME must point to
 326    a buffer of at least SIG2STR_MAX bytes.  Return 0 if successful, -1
 327    otherwise.  */
 328
 329 int
 330 sig2str (int signum, char *signame)
 331 {
 332   unsigned int i;
 333   for (i = 0; i < NUMNAME_ENTRIES; i++)
 334     if (numname_table[i].num == signum)
 335       {
 336         strcpy (signame, numname_table[i].name);
 337         return 0;
 338       }
 339
 340   {
 341     int rtmin = SIGRTMIN;
 342     int rtmax = SIGRTMAX;
 343     int base, delta;
 344
 345     if (! (rtmin <= signum && signum <= rtmax))
 346       return -1;
 347
 348     if (signum <= rtmin + (rtmax - rtmin) / 2)
 349       {
 350         strcpy (signame, "RTMIN");
 351         base = rtmin;
 352       }
 353     else
 354       {
 355         strcpy (signame, "RTMAX");
 356         base = rtmax;
 357       }
 358
 359     delta = signum - base;
 360     if (delta != 0)
 361       sprintf (signame + 5, "%+d", delta);
 362     return 0;
 363   }
 364 }