stdio-common/psiginfo.c

   1 /* Copyright (C) 2009, 2010 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <libintl.h>
  20 #include <signal.h>
  21 #include <stdint.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <not-cancel.h>
  27
  28
  29 /* Defined in sys_siglist.c.  */
  30 extern const char *const _sys_siglist[];
  31 extern const char *const _sys_siglist_internal[] attribute_hidden;
  32
  33
  34 #define MF(l) MF1 (l)
  35 #define MF1(l) str_##l
  36 #define C(s1, s2) C1 (s1, s2)
  37 #define C1(s1, s2) s1##s2
  38
  39 #define NOW SIGILL
  40 #include "psiginfo-define.h"
  41
  42 #define NOW SIGFPE
  43 #include "psiginfo-define.h"
  44
  45 #define NOW SIGSEGV
  46 #include "psiginfo-define.h"
  47
  48 #define NOW SIGBUS
  49 #include "psiginfo-define.h"
  50
  51 #define NOW SIGTRAP
  52 #include "psiginfo-define.h"
  53
  54 #define NOW SIGCLD
  55 #include "psiginfo-define.h"
  56
  57 #define NOW SIGPOLL
  58 #include "psiginfo-define.h"
  59
  60
  61 /* Print out on stderr a line consisting of the test in S, a colon, a space,
  62    a message describing the meaning of the signal number PINFO and a newline.
  63    If S is NULL or "", the colon and space are omitted.  */
  64 void
  65 psiginfo (const siginfo_t *pinfo, const char *s)
  66 {
  67   char buf[512];
  68   FILE *fp = fmemopen (buf, sizeof (buf), "w");
  69   if (fp == NULL)
  70     {
  71       const char *colon;
  72
  73       if (s == NULL || *s == '\0')
  74         s = colon = "";
  75       else
  76         colon = ": ";
  77
  78       __fxprintf (NULL, "%s%ssignal %d\n", s, colon, pinfo->si_signo);
  79       return;
  80     }
  81
  82   if (s != NULL && *s != '\0')
  83     fprintf (fp, "%s: ", s);
  84
  85   const char *desc;
  86   if (pinfo->si_signo >= 0 && pinfo->si_signo < NSIG
  87       && ((desc = INTUSE(_sys_siglist)[pinfo->si_signo]) != NULL
  88 #ifdef SIGRTMIN
  89           || (pinfo->si_signo >= SIGRTMIN && pinfo->si_signo < SIGRTMAX)
  90 #endif
  91          ))
  92     {
  93 #ifdef SIGRTMIN
  94       if (desc == NULL)
  95         {
  96           if (pinfo->si_signo - SIGRTMIN < SIGRTMAX - pinfo->si_signo)
  97             {
  98               if (pinfo->si_signo == SIGRTMIN)
  99                 fprintf (fp, "SIGRTMIN (");
 100               else
 101                 fprintf (fp, "SIGRTMIN+%d (", pinfo->si_signo - SIGRTMIN);
 102             }
 103           else
 104             {
 105               if (pinfo->si_signo == SIGRTMAX)
 106                 fprintf (fp, "SIGRTMAX (");
 107               else
 108                 fprintf (fp, "SIGRTMAX-%d (", SIGRTMAX - pinfo->si_signo);
 109             }
 110         }
 111       else
 112 #endif
 113         fprintf (fp, "%s (", _(desc));
 114
 115       const char *base = NULL;
 116       const uint8_t *offarr = NULL;
 117       size_t offarr_len = 0;
 118       switch (pinfo->si_signo)
 119         {
 120 #define H(sig) \
 121         case sig:                                                             \
 122           base = C(codestrs_, sig).str;                                       \
 123           offarr = C (codes_, sig);                                           \
 124           offarr_len = sizeof (C (codes_, sig)) / sizeof (C (codes_, sig)[0]);\
 125           break
 126
 127           H (SIGILL);
 128           H (SIGFPE);
 129           H (SIGSEGV);
 130           H (SIGBUS);
 131           H (SIGTRAP);
 132           H (SIGCHLD);
 133           H (SIGPOLL);
 134         }
 135
 136       const char *str = NULL;
 137       if (offarr != NULL
 138           && pinfo->si_code >= 1 && pinfo->si_code <= offarr_len)
 139         str = base + offarr[pinfo->si_code - 1];
 140       else
 141         switch (pinfo->si_code)
 142           {
 143           case SI_USER:
 144             str = N_("Signal sent by kill()");
 145             break;
 146           case SI_QUEUE:
 147             str = N_("Signal sent by sigqueue()");
 148             break;
 149           case SI_TIMER:
 150             str = N_("Signal generated by the expiration of a timer");
 151             break;
 152           case SI_ASYNCIO:
 153             str = N_("\
 154 Signal generated by the completion of an asynchronous I/O request");
 155             break;
 156           case SI_MESGQ:
 157             str = N_("\
 158 Signal generated by the arrival of a message on an empty message queue");
 159             break;
 160 #ifdef SI_TKILL
 161           case SI_TKILL:
 162             str = N_("Signal sent by tkill()");
 163             break;
 164 #endif
 165 #ifdef SI_ASYNCNL
 166           case SI_ASYNCNL:
 167             str = N_("\
 168 Signal generated by the completion of an asynchronous name lookup request");
 169             break;
 170 #endif
 171 #ifdef SI_SIGIO
 172           case SI_SIGIO:
 173             str = N_("\
 174 Signal generated by the completion of an I/O request");
 175             break;
 176 #endif
 177 #ifdef SI_KERNEL
 178           case SI_KERNEL:
 179             str = N_("Signal sent by the kernel");
 180             break;
 181 #endif
 182           }
 183
 184       if (str != NULL)
 185         fprintf (fp, "%s ", _(str));
 186       else
 187         fprintf (fp, "%d ", pinfo->si_code);
 188
 189       if (pinfo->si_signo == SIGILL || pinfo->si_signo == SIGFPE
 190           || pinfo->si_signo == SIGSEGV || pinfo->si_signo == SIGBUS)
 191         fprintf (fp, "[%p])\n", pinfo->si_addr);
 192       else if (pinfo->si_signo == SIGCHLD)
 193         fprintf (fp, "%ld %d %ld)\n",
 194                  (long int) pinfo->si_pid, pinfo->si_status,
 195                  (long int) pinfo->si_uid);
 196       else if (pinfo->si_signo == SIGPOLL)
 197         fprintf (fp, "%ld)\n", (long int) pinfo->si_band);
 198       else
 199         fprintf (fp, "%ld %ld)\n",
 200                  (long int) pinfo->si_pid, (long int) pinfo->si_uid);
 201     }
 202   else
 203     fprintf (fp, _("Unknown signal %d\n"),  pinfo->si_signo);
 204
 205   fclose (fp);
 206
 207   write_not_cancel (STDERR_FILENO, buf, strlen (buf));
 208 }