3.2.2. Attaching GDB to a process

Prerequisites

• GDB must be installed on the system

Procedure

• Start a program with GDB.

  1. Launch a program using GDB:

     $ gdb program

     Replace program with a file name or path to the program.

     GDB is ready to start execution of the program. You can configure breakpoints and the gdb environment before beginning the execution of the process with the run command. For more information on setting breakpoints, see Using GDB breakpoints to stop execution at defined code locations.

  2. Attach GDB to an already running process.

  3. Find the process ID (pid) with the ps command:

     $ ps -C program -o pid h

      pid

     Replace program with a file name or path to the program.

  4. Attach GDB to this process:

     $ gdb -p pid

     Replace pid with an actual process ID number from the ps output.

• Attach an active GDB session to a running program:

  1. Use the shell GDB command to run the ps command and find the program’s process ID (pid):

     (gdb) shell ps -C program -o pid h

      pid

     Replace program with a file name or path to the program.

  2. Use the attach command to attach GDB to the program:

     (gdb) attach pid

     Replace pid by an actual process ID number from the ps output.

     注意

     In some cases, GDB might not be able to find the corresponding executable file. Use the file command to specify the path:

     (gdb) file path/to/program