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2 Getting In and Out of GDB
This chapter discusses how to start GDB, and exit out of it. The essentials are:
•
type '(gdb)' to start GDB.
•
type quit or C-d to exit.
2.1 Invoking GDB
Invoke GDB by running the program (gdb). Once started, GDB reads commands from
the terminal until you tell it to exit.
the terminal until you tell it to exit.
You can also run (gdb) with a variety of arguments and options, to specify more of
your debugging environment at the outset.
your debugging environment at the outset.
The command-line options described here are designed to cover a variety of situations;
in some environments, some of these options may effectively be unavailable.
in some environments, some of these options may effectively be unavailable.
The most usual way to start GDB is with one argument, specifying an executable
program:
program:
(gdb) program
You can also start with both an executable program and a core file specified:
(gdb) program core
You can, instead, specify a process ID as a second argument, if you want to debug a
running process:
running process:
(gdb) program 1234
would attach GDB to process 1234 (unless you also have a file named '1234'; GDB
does check for a core file first).
does check for a core file first).
Taking advantage of the second command-line argument requires a fairly complete
operating system; when you use GDB as a remote debugger attached to a bare board,
there may not be any notion of “process”, and there is often no way to get a core dump.
GDB will warn you if it is unable to attach or to read core dumps.
operating system; when you use GDB as a remote debugger attached to a bare board,
there may not be any notion of “process”, and there is often no way to get a core dump.
GDB will warn you if it is unable to attach or to read core dumps.
You can run (gdb) without printing the front material, which describes GDB's
non-warranty, by specifying -silent:
non-warranty, by specifying -silent:
gdb -silent
You can further control how GDB starts up by using command-line options. GDB itself
can remind you of the options available.
can remind you of the options available.
Type
(gdb) -help
to display all available options and briefly describe their use ('(gdb)-h' is a shorter
equivalent).
equivalent).
2.1 Invoking GDB
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