The Linux Development Platform Configuring, Using, and ... - Classes

CH05.fm Page 165 Monday, October 7, 2002 9:00 PM
Debugging Running Processes 165
Figure 5-2 The gdb split window inside GNU Emacs.
5.10 Debugging Running Processes
In addition to stand-alone programs, running processes can also be debugged using GNU debugger.
The procedure is as follows:
1. Start the process that you want to debug.
2. Use the ps command to find the process ID of the running process.
3. Start gdb.
4. Load the file containing the symbol table into gdb.
5. Use the attach command to attach to the running process to gdb.
6. Continue debugging as usual.
In this section we shall attach to a process created by executing the sumf program that we
created earlier in this chapter. This program requires input of two numbers. After starting, the
process waits for the user to input these two numbers. You can open a new terminal window at