How to attach a process in gdb

UnixGdb

Unix Problem Overview

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?

Unix Solutions

Solution 1 - Unix

Try one of these:

gdb -p 12271
gdb /path/to/exe 12271

gdb /path/to/exe
(gdb) attach 12271

Solution 2 - Unix

The first argument should be the path to the executable program. So

gdb progname 12271

Solution 3 - Unix

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!

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Content TypeOriginal AuthorOriginal Content on Stackoverflow
Questionas3rdaccountView Question on Stackoverflow
Solution 1 - UnixEmployed RussianView Answer on Stackoverflow
Solution 2 - UnixDrCView Answer on Stackoverflow
Solution 3 - UnixStephane RollandView Answer on Stackoverflow