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Debug a Running Daemon [message #1715327]

Sun, 22 November 2015 10:18

Missing name Mising name

Messages: 6
Registered: January 2011

Junior Member

Hi

In order to debug a daemon, I need to debug it when it is running and check different variables in various functions. The daemon is a server-client app and after running, it starts and listen on a specific port and waits for user's input and based on the input it calls different functions. I have added many breakpoints on those functions, but after the daemon starts to listen on the port, (say, the daemon is running completely), I can not able to debug anything and the debugger does not stop on defined breakpoints, seems the debugger is terminated. How can I debug such application in the running state?

Thanks in advance

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Re: Debug a Running Daemon [message #1715335 is a reply to message #1715327]

Sun, 22 November 2015 11:46

Tauno Voipio

Messages: 742
Registered: August 2014

Senior Member

The classical way is to prevent the target program going to daemon state and run it as a normal program instead. The daemonization process gets rid of the original run environment pretty heavily and confuses the debugger.

You did not tell your operating system, so here is an example of an embedded Linux daemon:

--- clip clip ---

/* #includes and plenty of definitions left off */

#ifndef PCTEST
#define DAEMON 1
#endif

/* plenty of code left off */

int main(void)
{
#ifdef DAEMON
#ifdef PCTEST
daemon(1, 0);
#else
daemon(0, 0);
#endif
#endif
printlog("Version %s\n", get_ver());

for (;;)
{
net_setup();
setup();
runit();
release_all();
}

return 0;
}

--- clip clip ---

This example uses the Linux library function daemon() to perform the contortions needed to go into daemon state.

--

Tauno Voipio

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