1#!/bin/sh
2# Copyright (C) 1998-2021 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
19if test $# -eq 0; then
20  echo "$0: missing program name" >&2
21  echo "Try \`$0 --help' for more information." >&2
22  exit 1
23fi
24
25prog="$1"
26shift
27
28if 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@.
37EOF
38      exit 0
39      ;;
40    --v | --ve | --ver | --vers | --versi | --versio | --version)
41      echo 'catchsegv @PKGVERSION@@VERSION@'
42      echo 'Copyright (C) 2021 Free Software Foundation, Inc.
43This is free software; see the source for copying conditions.  There is NO
44warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
45Written by Ulrich Drepper.'
46      exit 0
47      ;;
48    *)
49      ;;
50  esac
51fi
52
53segv_output=`mktemp ${TMPDIR:-/tmp}/segv_output.XXXXXX` || exit
54
55# Redirect stderr to avoid termination message from shell.
56(exec 3>&2 2>/dev/null
57LD_PRELOAD=${LD_PRELOAD:+${LD_PRELOAD}:}@SLIB@/libSegFault.so \
58SEGFAULT_USE_ALTSTACK=1 \
59SEGFAULT_OUTPUT_NAME=$segv_output \
60"$prog" ${1+"$@"} 2>&3 3>&-)
61exval=$?
62
63# Check for output.  Even if the program terminated correctly it might
64# be that a minor process (clone) failed.  Therefore we do not check the
65# exit code.
66if test -s "$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 "$line"
100	    ;;
101     esac
102   done)
103fi
104rm -f "$segv_output"
105
106exit $exval
107