stdio-common/psiginfo.c

   1 /* Copyright (C) 2009-2017 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 #define MF(l) MF1 (l)
  30 #define MF1(l) str_##l
  31 #define C(s1, s2) C1 (s1, s2)
  32 #define C1(s1, s2) s1##s2
  33
  34 #define NOW SIGILL
  35 #include "psiginfo-define.h"
  36
  37 #define NOW SIGFPE
  38 #include "psiginfo-define.h"
  39
  40 #define NOW SIGSEGV
  41 #include "psiginfo-define.h"
  42
  43 #define NOW SIGBUS
  44 #include "psiginfo-define.h"
  45
  46 #define NOW SIGTRAP
  47 #include "psiginfo-define.h"
  48
  49 #define NOW SIGCLD
  50 #include "psiginfo-define.h"
  51
  52 #define NOW SIGPOLL
  53 #include "psiginfo-define.h"
  54
  55
  56 /* Print out on stderr a line consisting of the test in S, a colon, a space,
  57    a message describing the meaning of the signal number PINFO and a newline.
  58    If S is NULL or "", the colon and space are omitted.  */
  59 void
  60 psiginfo (const siginfo_t *pinfo, const char *s)
  61 {
  62   char buf[512];
  63   FILE *fp = __fmemopen (buf, sizeof (buf), "w");
  64   if (fp == NULL)
  65     {
  66       const char *colon;
  67
  68       if (s == NULL || *s == '\0')
  69         s = colon = "";
  70       else
  71         colon = ": ";
  72
  73       __fxprintf (NULL, "%s%ssignal %d\n", s, colon, pinfo->si_signo);
  74       return;
  75     }
  76
  77   if (s != NULL && *s != '\0')
  78     fprintf (fp, "%s: ", s);
  79
  80   const char *desc;
  81   if (pinfo->si_signo >= 0 && pinfo->si_signo < NSIG
  82       && ((desc = _sys_siglist[pinfo->si_signo]) != NULL
  83 #ifdef SIGRTMIN
  84           || (pinfo->si_signo >= SIGRTMIN && pinfo->si_signo < SIGRTMAX)
  85 #endif
  86          ))
  87     {
  88 #ifdef SIGRTMIN
  89       if (desc == NULL)
  90         {
  91           if (pinfo->si_signo - SIGRTMIN < SIGRTMAX - pinfo->si_signo)
  92             {
  93               if (pinfo->si_signo == SIGRTMIN)
  94                 fprintf (fp, "SIGRTMIN (");
  95               else
  96                 fprintf (fp, "SIGRTMIN+%d (", pinfo->si_signo - SIGRTMIN);
  97             }
  98           else
  99             {
 100               if (pinfo->si_signo == SIGRTMAX)
 101                 fprintf (fp, "SIGRTMAX (");
 102               else
 103                 fprintf (fp, "SIGRTMAX-%d (", SIGRTMAX - pinfo->si_signo);
 104             }
 105         }
 106       else
 107 #endif
 108         fprintf (fp, "%s (", _(desc));
 109
 110       const char *base = NULL;
 111       const uint8_t *offarr = NULL;
 112       size_t offarr_len = 0;
 113       switch (pinfo->si_signo)
 114         {
 115 #define H(sig) \
 116         case sig:                                                             \
 117           base = C(codestrs_, sig).str;                                       \
 118           offarr = C (codes_, sig);                                           \
 119           offarr_len = sizeof (C (codes_, sig)) / sizeof (C (codes_, sig)[0]);\
 120           break
 121
 122           H (SIGILL);
 123           H (SIGFPE);
 124           H (SIGSEGV);
 125           H (SIGBUS);
 126           H (SIGTRAP);
 127           H (SIGCHLD);
 128           H (SIGPOLL);
 129         }
 130
 131       const char *str = NULL;
 132       if (offarr != NULL
 133           && pinfo->si_code >= 1 && pinfo->si_code <= offarr_len)
 134         str = base + offarr[pinfo->si_code - 1];
 135       else
 136         switch (pinfo->si_code)
 137           {
 138           case SI_USER:
 139             str = N_("Signal sent by kill()");
 140             break;
 141           case SI_QUEUE:
 142             str = N_("Signal sent by sigqueue()");
 143             break;
 144           case SI_TIMER:
 145             str = N_("Signal generated by the expiration of a timer");
 146             break;
 147           case SI_ASYNCIO:
 148             str = N_("\
 149 Signal generated by the completion of an asynchronous I/O request");
 150             break;
 151           case SI_MESGQ:
 152             str = N_("\
 153 Signal generated by the arrival of a message on an empty message queue");
 154             break;
 155 #ifdef SI_TKILL
 156           case SI_TKILL:
 157             str = N_("Signal sent by tkill()");
 158             break;
 159 #endif
 160 #ifdef SI_ASYNCNL
 161           case SI_ASYNCNL:
 162             str = N_("\
 163 Signal generated by the completion of an asynchronous name lookup request");
 164             break;
 165 #endif
 166 #ifdef SI_SIGIO
 167           case SI_SIGIO:
 168             str = N_("\
 169 Signal generated by the completion of an I/O request");
 170             break;
 171 #endif
 172 #ifdef SI_KERNEL
 173           case SI_KERNEL:
 174             str = N_("Signal sent by the kernel");
 175             break;
 176 #endif
 177           }
 178
 179       if (str != NULL)
 180         fprintf (fp, "%s ", _(str));
 181       else
 182         fprintf (fp, "%d ", pinfo->si_code);
 183
 184       if (pinfo->si_signo == SIGILL || pinfo->si_signo == SIGFPE
 185           || pinfo->si_signo == SIGSEGV || pinfo->si_signo == SIGBUS)
 186         fprintf (fp, "[%p])\n", pinfo->si_addr);
 187       else if (pinfo->si_signo == SIGCHLD)
 188         fprintf (fp, "%ld %d %ld)\n",
 189                  (long int) pinfo->si_pid, pinfo->si_status,
 190                  (long int) pinfo->si_uid);
 191       else if (pinfo->si_signo == SIGPOLL)
 192         fprintf (fp, "%ld)\n", (long int) pinfo->si_band);
 193       else
 194         fprintf (fp, "%ld %ld)\n",
 195                  (long int) pinfo->si_pid, (long int) pinfo->si_uid);
 196     }
 197   else
 198     fprintf (fp, _("Unknown signal %d\n"),  pinfo->si_signo);
 199
 200   fclose (fp);
 201
 202   write_not_cancel (STDERR_FILENO, buf, strlen (buf));
 203 }