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#!/bin/bash
# gdb-wrapper2
# Copyright (C) 2017 Paweł Redman <pawel.redman@gmail.com>
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
SELF="$0"
PROGRAM="$1"
shift 1
if [ -z "$PROGRAM" ]; then
echo "$SELF [program] (args...)"
exit 1
fi
# Check if the program exists before calling GDB so the errors are clearer.
if [ ! -f "$PROGRAM" ]; then
stat "$PROGRAM"
exit 1
fi
# 'catch' and 'break' can be followed by a 'commands' block to tell GDB what
# to do in case of a breakpoint/signal. This is where the stack is printed
# and the core is dumped.
function write_commands {
echo "commands"
echo "thread apply all backtrace"
echo "gcore"
echo "echo \n"
# Terminate if this isn't the first fault to avoid infinite
# recursion.
echo "set \$faults = \$faults + 1"
echo "if \$faults >= 2"
echo "echo Double fault, terminating the program.\n"
echo "kill"
echo "quit"
echo "else"
# Resume the program's execution.
# If the program can handle signals and exit gracefully
# then this script should let it (after dumping a core
# for debugging).
echo "continue"
echo "end"
echo "end"
}
function write_config {
# Make sure gdb won't ask for interactive input. This is supposed
# to never happen when using -batch but I don't trust them.
echo "set confirm off"
echo "set width unlimited"
echo "set height unlimited"
echo "set pagination off"
echo "set backtrace limit unlimited"
echo "set \$faults = 0"
# This catches all signals except SIGINT and SIGTRAP.
echo "catch signal"
write_commands
# Catch SIGINT too, just in case.
echo "catch signal SIGINT"
write_commands
# Catch calls to Com_Error. You'll want something else here if you're
# using this script for another program.
echo "break Com_Error"
write_commands
# Finally start the program.
echo "run"
}
# Disable automatic coredumps.
ulimit -c 0
# For some reason gdb's '-x' option won't accept a pipe as an argument. The
# workaround is to create a temporary file for the configuration.
config_path=$(mktemp /tmp/gdb-wrapper2.XXXXXX)
write_config > "$config_path"
gdb -batch -x "$config_path" --args "$PROGRAM" "$@"
exit_status="$?"
rm "$config_path"
exit $exit_status
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