test.sh

#!/usr/bin/env bash

export PATH=/opt/gdb-git/bin:$PATH
gdb --version

count=200

pidfile=logs/nginx.pid
port=8081

mkdir -p conf logs || exit 1

cat << EOF > conf/nginx.conf
daemon on;
master_process on;
worker_processes 2;
pid $pidfile;

events {
    accept_mutex off;
    worker_connections 1024;
}

http {
    server {
        listen 127.0.0.1:$port reuseport;

        location / {
            return 200 "test\\n";
        }
    }
}
EOF

if [ -f $pidfile ]; then
    pid=`cat logs/nginx.pid`
    if [ -n "$pid" ]; then
        kill -QUIT $pid;
        sleep 0.2
    fi
fi

nginx -p $PWD/ -c conf/nginx.conf || exit 1
sleep 0.2

pid=`cat $pidfile`
if [ -z "$pid" ]; then
    sleep 1
    pid=`cat $pidfile`
    if [ -z "$pid" ]; then
        echo "failed to get pid from $pidfile" > /dev/stderr
        exit 1
    fi
fi

out=`pgrep -P $pid`
if [ -z "$out" ]; then
    echo "failed to get nginx worker processes under pid $pid" > /dev/stderr
    exit 1
fi
pids=(${out// / })
pid0=${pids[0]}
pid1=${pids[1]}

echo "pid 0: $pid0"
echo "pid 1: $pid1"

gdb --nx --batch \
    -ex 'set schedule-multiple on' \
    -ex 'set non-stop on' \
    -ex "attach $pid0" \
    -ex add-inferior \
    -ex 'inferior 2' \
    -ex "attach $pid1" \
    -ex 'i inferiors' \
    -ex 'b ngx_http_handler' \
    -ex 'continue -a' \
    -ex 'delete' \
    -ex quit &

gdb_pid=$!
#echo "HERE:" > /dev/stderr
ps aux|grep nginx
sleep 1
echo sending SIGINT to gdb process $gdb_pid ...
kill -s SIGINT $gdb_pid || exit 1
for i in $(seq 1 $count); do
    curl -Ss http://127.0.0.1:$port/ > /dev/null \
        || { echo $i; ps aux|grep nginx; exit 1; }
done
echo success!