stdio-common/psiginfo.c

   1 /* Copyright (C) 2009 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <libintl.h>
  21 #include <signal.h>
  22 #include <stdint.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27 #include <not-cancel.h>
  28
  29
  30 /* Defined in sys_siglist.c.  */
  31 extern const char *const _sys_siglist[];
  32 extern const char *const _sys_siglist_internal[] attribute_hidden;
  33
  34
  35 #define MF(l) MF1 (l)
  36 #define MF1(l) str_##l
  37 #define C(s1, s2) C1 (s1, s2)
  38 #define C1(s1, s2) s1##s2
  39
  40 #define NOW SIGILL
  41 #include "psiginfo-define.h"
  42
  43 #define NOW SIGFPE
  44 #include "psiginfo-define.h"
  45
  46 #define NOW SIGSEGV
  47 #include "psiginfo-define.h"
  48
  49 #define NOW SIGBUS
  50 #include "psiginfo-define.h"
  51
  52 #define NOW SIGTRAP
  53 #include "psiginfo-define.h"
  54
  55 #define NOW SIGCLD
  56 #include "psiginfo-define.h"
  57
  58 #define NOW SIGPOLL
  59 #include "psiginfo-define.h"
  60
  61
  62 /* Print out on stderr a line consisting of the test in S, a colon, a space,
  63    a message describing the meaning of the signal number PINFO and a newline.
  64    If S is NULL or "", the colon and space are omitted.  */
  65 void
  66 psiginfo (const siginfo_t *pinfo, const char *s)
  67 {
  68   char buf[512];
  69   FILE *fp = fmemopen (buf, sizeof (buf), "w");
  70   if (fp == NULL)
  71     {
  72       const char *colon;
  73
  74       if (s == NULL || *s == '\0')
  75         s = colon = "";
  76       else
  77         colon = ": ";
  78
  79       __fxprintf (NULL, "%s%ssignal %d\n", s, colon, pinfo->si_signo);
  80       return;
  81     }
  82
  83   if (s != NULL && *s != '\0')
  84     fprintf (fp, "%s: ", s);
  85
  86   const char *desc;
  87   if (pinfo->si_signo >= 0 && pinfo->si_signo < NSIG
  88       && (desc = INTUSE(_sys_siglist)[pinfo->si_signo]) != NULL)
  89     {
  90       fprintf (fp, "%s (", _(desc));
  91
  92       const char *base = NULL;
  93       const uint8_t *offarr = NULL;
  94       size_t offarr_len = 0;
  95       switch (pinfo->si_signo)
  96         {
  97 #define H(sig) \
  98         case sig:                                                             \
  99           base = C(codestrs_, sig).str;                                       \
 100           offarr = C (codes_, sig);                                           \
 101           offarr_len = sizeof (C (codes_, sig)) / sizeof (C (codes_, sig)[0]);\
 102           break
 103
 104           H (SIGILL);
 105           H (SIGFPE);
 106           H (SIGSEGV);
 107           H (SIGBUS);
 108           H (SIGTRAP);
 109           H (SIGCHLD);
 110           H (SIGPOLL);
 111         }
 112
 113       const char *str = NULL;
 114       if (offarr != NULL
 115           && pinfo->si_code >= 1 && pinfo->si_code <= offarr_len)
 116         str = base + offarr[pinfo->si_code - 1];
 117       else
 118         switch (pinfo->si_code)
 119           {
 120           case SI_USER:
 121             str = N_("Signal sent by kill()");
 122             break;
 123           case SI_QUEUE:
 124             str = N_("Signal sent by sigqueue()");
 125             break;
 126           case SI_TIMER:
 127             str = N_("Signal generated by the expiration of a timer");
 128             break;
 129           case SI_ASYNCIO:
 130             str = N_("\
 131 Signal generated by the completion of an asynchronous I/O request");
 132             break;
 133           case SI_MESGQ:
 134             str = N_("\
 135 Signal generated by the arrival of a message on an empty message queue");
 136             break;
 137 #ifdef SI_TKILL
 138           case SI_TKILL:
 139             str = N_("Signal sent by tkill()");
 140             break;
 141 #endif
 142 #ifdef SI_ASYNCNL
 143           case SI_ASYNCNL:
 144             str = N_("\
 145 Signal generated by the completion of an asynchronous name lookup request");
 146             break;
 147 #endif
 148 #ifdef SI_SIGIO
 149           case SI_SIGIO:
 150             str = N_("\
 151 Signal generated by the completion of an I/O request");
 152             break;
 153 #endif
 154 #ifdef SI_KERNEL
 155           case SI_KERNEL:
 156             str = N_("Signal sent by the kernel");
 157             break;
 158 #endif
 159           }
 160
 161       if (str != NULL)
 162         fprintf (fp, "%s ", _(str));
 163       else
 164         fprintf (fp, "%d ", pinfo->si_code);
 165
 166       if (pinfo->si_signo == SIGILL || pinfo->si_signo == SIGFPE
 167           || pinfo->si_signo == SIGSEGV || pinfo->si_signo == SIGBUS)
 168         fprintf (fp, "[%p])", pinfo->si_addr);
 169       else if (pinfo->si_signo == SIGCHLD)
 170         fprintf (fp, "%ld %d %ld)", (long int) pinfo->si_pid, pinfo->si_status,
 171                  (long int) pinfo->si_uid);
 172       else if (pinfo->si_signo == SIGPOLL)
 173         fprintf (fp, "%ld)", pinfo->si_band);
 174       else
 175         fprintf (fp, "%ld %ld)",
 176                  (long int) pinfo->si_pid, (long int) pinfo->si_uid);
 177     }
 178   else
 179     fprintf (fp, _("Unknown signal %d\n"),  pinfo->si_signo);
 180
 181   fclose (fp);
 182
 183   write_not_cancel (STDERR_FILENO, buf, strlen (buf));
 184 }