This post will explain how to attach gdb to net-snmp agent which is loaded by net-snmp using shared library method.
Base condition
You need to check net-snmp is runing properly or not with agent using shared library method.
Please check snmpd.conf and service status.
# check snmpd.conf whether it' shared library mode or not
vim ~/.snmp/snmpd.conf
# check snmpd control
sudo service snmpd status
sudo service snmpd restart Run on x86
Kill running net-snmp then run snmpd by gdb. once gdb shell entered, input options to run snmpd properly. Actually, you can catch that options by result of “sudo service snmpd status” which described running command with options.
# kill running snmpd & check twice after kill
ps -ef | grep snmpd
sudo kill <pid of snmpd>
# run gdb with snmpd
sudo gdb /usr/local/sbin/snmpd
# put below in gdb shell , below is same as "/etc/init.d/snmpd" described
(gdb) run -Ls0-7d -a -f -c /home/surplsdev/.snmp/snmpd.conf -p /run/snmpd.pidRun on some embeded linux(arm64)
# kill running snmpd & check twice after kill
ps -ef | grep snmpd
kill <pid of snmpd>
# run gdb with snmpd
gdb /usr/sbin/snmpd
(gdb) run -Ls0-6d -a -f -p /run/snmpd.pid