CODEWITHSUNDEEP
gdbgdbinit
Darshan L
Darshan L

Reputation: 945

GDB is not taking the instruction placed in the ~/.gdbint and/or ~/.gdbrc file

I am using GDB to debug my C program. And since I am handling SIGUSR1 in my program. So once I run the gdb with my program executable like -

gdb <my_executable>

under the gdb prompt (gdb) I need to enter -

handle SIGUSR1 nostop noprint pass

since I need to do this every time, I wanted to place this handle command in the init script. So after googling, I got to know about the ~/.gdbrc and ~/.gdbinit. I tried to place the handle command in both the files, but still I don't see that handle command is executed once after gdb reads the symbols from the executable.

What could be wrong with this?

Edit: GNU gdb (GDB) 7.2.2

Edit 2: My .gdbrc file content looks like -

 echo "hello from gdbrc"
 handle SIGUSR1 nostop noprint pass
 run 204

Edit 3: Even I tried with GNU gdb (GDB) 8.1.3 Still I'm facing the same issue.

Edit 4: The ~/.gdbrc and ~/.gdbinit are given full access permission -

-rwxrwxrwx   1 darshan grp      68 Oct  9 22:14 .gdbint
-rwxrwxrwx   1 darshan grp      67 Oct  9 22:14 .gdbrc

Edit 5: I had named the file wrongly as ".gdbint" instead of ".gdbinit". After renaming, I found with the GDB 8.1.3, it is being read at the startup. However, with GDB 7.2.2 still I see the problem - .gdbinit file is not read at the startup.

And ~/.gdbrc is NOT a right filename to use and won't be recognized by GDB.

Upvotes: 2

Views: 2319

Answers (1)

Employed Russian
Employed Russian

Reputation: 213937

Can I assume GDB 7.2.2 didnt support .gdbinit?

GDB has supported reading ~/.gdbinit since forever (at least since version 4.0, but probably much earlier).

You should be able to figure out what's happening by looking at the output from

strace -e file gdb --version |& grep gdbinit

Here is what I see:

stat("/home/employedrussian/.gdbinit", {st_mode=S_IFREG|0640, st_size=629, ...}) = 0
stat(".gdbinit", 0x7ffe51ef72f0)        = -1 ENOENT (No such file or directory)

Update:

When I run the command, I see no output with GDB 7.2.2 But with GDB 8.1.3, I see the same output like you.

Ok, it seems that you have a broken version of GDB 7.2.2. Try newer version.

I could not find any bug about GDB not reading .gdbinit, but maybe it was broken at some point temporarily.

what is the different purposes between ~/.gdbinit and ~/.gdbrc

The former is read by GDB, the latter isn't (where did you get the idea that GDB would read it?).

Update:

I thought just like many other linux application

It is a UNIX shell convention to read ~/.${SHELL}rc file on startup, and other applications may do so as well. But GDB isn't one of them.

http://stackoverflow.com/a/7195718/5347487

That answer is wrong.

Upvotes: 3

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