lib/sig2str.c

   1 /* sig2str.c -- convert between signal names and numbers
   2
   3    Copyright (C) 2002, 2004, 2006, 2009-2018 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 5L.  */
 193 #ifdef SIGDANGER
 194     NUMNAME (DANGER),
 195 #endif
 196 #ifdef SIGGRANT
 197     NUMNAME (GRANT),
 198 #endif
 199 #ifdef SIGMIGRATE
 200     NUMNAME (MIGRATE),
 201 #endif
 202 #ifdef SIGMSG
 203     NUMNAME (MSG),
 204 #endif
 205 #ifdef SIGPRE
 206     NUMNAME (PRE),
 207 #endif
 208 #ifdef SIGRETRACT
 209     NUMNAME (RETRACT),
 210 #endif
 211 #ifdef SIGSAK
 212     NUMNAME (SAK),
 213 #endif
 214 #ifdef SIGSOUND
 215     NUMNAME (SOUND),
 216 #endif
 217
 218     /* Older AIX versions.  */
 219 #ifdef SIGALRM1
 220     NUMNAME (ALRM1),    /* unknown; taken from Bash 2.05 */
 221 #endif
 222 #ifdef SIGKAP
 223     NUMNAME (KAP),      /* Older name for SIGGRANT.  */
 224 #endif
 225 #ifdef SIGVIRT
 226     NUMNAME (VIRT),     /* unknown; taken from Bash 2.05 */
 227 #endif
 228 #ifdef SIGWINDOW
 229     NUMNAME (WINDOW),   /* Older name for SIGWINCH.  */
 230 #endif
 231
 232     /* BeOS */
 233 #ifdef SIGKILLTHR
 234     NUMNAME (KILLTHR),
 235 #endif
 236
 237     /* Older HP-UX versions.  */
 238 #ifdef SIGDIL
 239     NUMNAME (DIL),
 240 #endif
 241
 242     /* Korn shell and Bash, of uncertain vintage.  */
 243     { 0, "EXIT" }
 244   };
 245
 246 #define NUMNAME_ENTRIES (sizeof numname_table / sizeof numname_table[0])
 247
 248 /* ISDIGIT differs from isdigit, as follows:
 249    - Its arg may be any int or unsigned int; it need not be an unsigned char
 250      or EOF.
 251    - It's typically faster.
 252    POSIX says that only '0' through '9' are digits.  Prefer ISDIGIT to
 253    isdigit unless it's important to use the locale's definition
 254    of "digit" even when the host does not conform to POSIX.  */
 255 #define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
 256
 257 /* Convert the signal name SIGNAME to a signal number.  Return the
 258    signal number if successful, -1 otherwise.  */
 259
 260 static int
 261 str2signum (char const *signame)
 262 {
 263   if (ISDIGIT (*signame))
 264     {
 265       char *endp;
 266       long int n = strtol (signame, &endp, 10);
 267       if (! *endp && n <= SIGNUM_BOUND)
 268         return n;
 269     }
 270   else
 271     {
 272       unsigned int i;
 273       for (i = 0; i < NUMNAME_ENTRIES; i++)
 274         if (strcmp (numname_table[i].name, signame) == 0)
 275           return numname_table[i].num;
 276
 277       {
 278         char *endp;
 279         int rtmin = SIGRTMIN;
 280         int rtmax = SIGRTMAX;
 281
 282         if (0 < rtmin && strncmp (signame, "RTMIN", 5) == 0)
 283           {
 284             long int n = strtol (signame + 5, &endp, 10);
 285             if (! *endp && 0 <= n && n <= rtmax - rtmin)
 286               return rtmin + n;
 287           }
 288         else if (0 < rtmax && strncmp (signame, "RTMAX", 5) == 0)
 289           {
 290             long int n = strtol (signame + 5, &endp, 10);
 291             if (! *endp && rtmin - rtmax <= n && n <= 0)
 292               return rtmax + n;
 293           }
 294       }
 295     }
 296
 297   return -1;
 298 }
 299
 300 /* Convert the signal name SIGNAME to the signal number *SIGNUM.
 301    Return 0 if successful, -1 otherwise.  */
 302
 303 int
 304 str2sig (char const *signame, int *signum)
 305 {
 306   *signum = str2signum (signame);
 307   return *signum < 0 ? -1 : 0;
 308 }
 309
 310 /* Convert SIGNUM to a signal name in SIGNAME.  SIGNAME must point to
 311    a buffer of at least SIG2STR_MAX bytes.  Return 0 if successful, -1
 312    otherwise.  */
 313
 314 int
 315 sig2str (int signum, char *signame)
 316 {
 317   unsigned int i;
 318   for (i = 0; i < NUMNAME_ENTRIES; i++)
 319     if (numname_table[i].num == signum)
 320       {
 321         strcpy (signame, numname_table[i].name);
 322         return 0;
 323       }
 324
 325   {
 326     int rtmin = SIGRTMIN;
 327     int rtmax = SIGRTMAX;
 328     int base, delta;
 329
 330     if (! (rtmin <= signum && signum <= rtmax))
 331       return -1;
 332
 333     if (signum <= rtmin + (rtmax - rtmin) / 2)
 334       {
 335         strcpy (signame, "RTMIN");
 336         base = rtmin;
 337       }
 338     else
 339       {
 340         strcpy (signame, "RTMAX");
 341         base = rtmax;
 342       }
 343
 344     delta = signum - base;
 345     if (delta != 0)
 346       sprintf (signame + 5, "%+d", delta);
 347     return 0;
 348   }
 349 }