debug/catchsegv.sh

   1 #!/bin/sh
   2 # Copyright (C) 1998-2022 Free Software Foundation, Inc.
   3 # This file is part of the GNU C Library.
   4
   5 # The GNU C Library is free software; you can redistribute it and/or
   6 # modify it under the terms of the GNU Lesser General Public
   7 # License as published by the Free Software Foundation; either
   8 # version 2.1 of the License, or (at your option) any later version.
   9
  10 # The GNU C Library 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 GNU
  13 # Lesser General Public License for more details.
  14
  15 # You should have received a copy of the GNU Lesser General Public
  16 # License along with the GNU C Library; if not, see
  17 # <https://www.gnu.org/licenses/>.
  18
  19 if test $# -eq 0; then
  20   echo "$0: missing program name" >&2
  21   echo "Try \`$0 --help' for more information." >&2
  22   exit 1
  23 fi
  24
  25 prog="$1"
  26 shift
  27
  28 if test $# -eq 0; then
  29   case "$prog" in
  30     --h | --he | --hel | --help)
  31       echo 'Usage: catchsegv PROGRAM ARGS...'
  32       echo '  --help      print this help, then exit'
  33       echo '  --version   print version number, then exit'
  34       echo 'For bug reporting instructions, please see:'
  35       cat <<\EOF
  36 @REPORT_BUGS_TO@.
  37 EOF
  38       exit 0
  39       ;;
  40     --v | --ve | --ver | --vers | --versi | --versio | --version)
  41       echo 'catchsegv @PKGVERSION@@VERSION@'
  42       echo 'Copyright (C) 2022 Free Software Foundation, Inc.
  43 This is free software; see the source for copying conditions.  There is NO
  44 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  45 Written by Ulrich Drepper.'
  46       exit 0
  47       ;;
  48     *)
  49       ;;
  50   esac
  51 fi
  52
  53 segv_output=`mktemp ${TMPDIR:-/tmp}/segv_output.XXXXXX` || exit
  54
  55 # Redirect stderr to avoid termination message from shell.
  56 (exec 3>&2 2>/dev/null
  57 LD_PRELOAD=${LD_PRELOAD:+${LD_PRELOAD}:}@SLIB@/libSegFault.so \
  58 SEGFAULT_USE_ALTSTACK=1 \
  59 SEGFAULT_OUTPUT_NAME=$segv_output \
  60 "$prog" ${1+"$@"} 2>&3 3>&-)
  61 exval=$?
  62
  63 # Check for output.  Even if the program terminated correctly it might
  64 # be that a minor process (clone) failed.  Therefore we do not check the
  65 # exit code.
  66 if test -s "$segv_output"; then
  67   # The program caught a signal.  The output is in the file with the
  68   # name we have in SEGFAULT_OUTPUT_NAME.  In the output the names of
  69   # functions in shared objects are available, but names in the static
  70   # part of the program are not.  We use addr2line to get this information.
  71   case $prog in
  72   */*) ;;
  73   *)
  74     old_IFS=$IFS
  75     IFS=:
  76     for p in $PATH; do
  77       test -n "$p" || p=.
  78       if test -f "$p/$prog"; then
  79         prog=$p/$prog
  80       break
  81       fi
  82     done
  83     IFS=$old_IFS
  84     ;;
  85   esac
  86   sed '/Backtrace/q' "$segv_output"
  87   sed '1,/Backtrace/d' "$segv_output" |
  88   (while read line; do
  89      line=`echo $line | sed "s@^$prog\\(\\[.*\\)@\1@"`
  90      case "$line" in
  91        \[*) addr=`echo "$line" | sed 's/^\[\(.*\)\]$/\1/'`
  92             complete=`addr2line -f -e "$prog" $addr 2>/dev/null`
  93             if test $? -eq 0; then
  94               echo "`echo "$complete"|sed 'N;s/\(.*\)\n\(.*\)/\2(\1)/;'`$line"
  95             else
  96               echo "$line"
  97             fi
  98             ;;
  99          *) echo "$line"
 100             ;;
 101      esac
 102    done)
 103 fi
 104 rm -f "$segv_output"
 105
 106 exit $exval