How to attach a process in gdb

Question

I have a simple C program that forks a process and then runs an executable    I want to attach the child process to gdb    I run the main program in a console and open another console to find the pid of the child process  then I start gdb with the following command   gdb attach 12271   where 12271 is the child process id  but the attach fails with   No such file or directory    Any idea why

User · Answer

The first argument should be the path to the executable program   So  gdb progname 12271

User · Answer

Try one of these   gdb -p 12271 gdb  path to exe 12271  gdb  path to exe  gdb  attach 12271

User · Answer

With a running instance of myExecutableName having a PID 15073  hitting Tab twice after   gdb myExecu in the command line  will automagically autocompletes to    gdb myExecutableName 15073  and will attach gdb to this process  That s nice

[unix] How to attach a process in gdb

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