Dbx 1024 User's Guide download pdf (Page 22)

Chapter 2: Running dbx

Specifying Object and Core Files

The object_ﬁle is the name of the executable object ﬁle that you want to

debug. It provides both the code that dbx executes and the symbol table that

provides variable and procedure names and maps executable code to its

corresponding source code in source ﬁles.

Acoreﬁle is produced when a program exits abnormally and produces a core

dump. dbx allows you to provide the name of a core ﬁle that it uses as “the

contents of memory” for the program that you specify. If you provide a core

ﬁle, dbx lists the point of program failure. You can then perform stack traces

and examine variable values to determine why a program crashed.

However, you cannot force the program to execute past the line that caused

it to crash.

If you don’t specify a coreﬁle, dbx examines the current directory for a ﬁle

namedcore. If it ﬁnds core, and if core seems (based on data in the core ﬁle) to

be a core dump of the program you speciﬁed, dbx acts as if you had speciﬁed

core as the core ﬁle.

You can specify object and core ﬁles either as arguments when you invoke

dbx or as commands that you enter at the dbx prompt.

The

dbx

Prompt

Once dbx starts, it displays the prompt:

(dbx)

To change this prompt, change the value of the dbx $prompt variable. “Setting

dbx Variables” on page 20 describes how to set dbx variables.

Specifying Files with

dbx

Commands

Thegivenﬁle and coreﬁle dbx commands allow you to set the object ﬁle and the

core ﬁle, respectively, while dbx is running.

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Dbx 1024 User's Guide Page 22