set print elements 0 From the GDB manual: set print elements number-of-elements Set a limit on how many elements of an array GDB will print. If GDB is printing a large array, it stops printing after it has printed the number of elements set by the set print elements command. This limit also applies to … Read more
What I’d like to do is insert a bit of code at the particular point that I want to start debugging. I usually do it like this: volatile int done = 0; while (!done) sleep(1); Attach GDB (you’ll be inside sleep). Do finish, then set var done = 1, and enjoy the rest of your … Read more
Because int8_t is the same as signed char, and char is not treated as a number by the stream. Cast into e.g. int16_t std::cout << static_cast<int16_t>(value) << std::endl; and you’ll get the correct result.
This link contains a good checklist why core dumps are not generated: The core would have been larger than the current limit. You don’t have the necessary permissions to dump core (directory and file). Notice that core dumps are placed in the dumping process’ current directory which could be different from the parent process. Verify … Read more
You can try using a “catchpoint” (catch throw) to stop the debugger at the point where the exception is generated. The following excerpt From the gdb manual describes the catchpoint feature. 5.1.3 Setting catchpoints You can use catchpoints to cause the debugger to stop for certain kinds of program events, such as C++ exceptions or … Read more
Type info variables to list “All global and static variable names” (huge list. Type info locals to list “Local variables of current stack frame” (names and values), including static variables in that function. Type info args to list “Arguments of the current stack frame” (names and values).
gdb 7.12 supports file globbing to specify the files to skip in the debugger. The documentation for the same is as below: https://sourceware.org/gdb/onlinedocs/gdb/Skipping-Over-Functions-and-Files.html To skip stepping into all library headers in the directory /usr/include/c++/5/bits, add the below lines to ~/.gdbinit # To skip all .h files in /usr/include/c++/5/bits skip -gfi /usr/include/c++/5/bits/*.h Instead to skip a … Read more
Why does java app crash in gdb but runs normally in real life? Because it doesn’t actually crash. Java uses speculative loads. If a pointer points to addressable memory, the load succeeds. Rarely the pointer does not point to addressable memory, and the attempted load generates SIGSEGV … which java runtime intercepts, makes the memory … Read more
At first, you may run the program and debug it by pid. This solution, of course, doesn’t cover all cases. Another approach is to use Linux capabilities for inter-process communication. In short, you redirect the output of ret to a FIFO special file (“named pipe”) and then read from that FIFO via debugger. Here’s how … Read more
It’s called the TUI (no kidding). Start for example with gdbtui or gdb -tui … Please also see this answer by Ciro Santilli. It wasn’t available in 2012 to the best of my knowledge, but definitely worth a look.