User`s guide

Tracing Program Execution

cont {at | to} line

Sets a temporary breakpoint at the speciﬁed source line,

then resumes execution with the current line. When your

program reaches the breakpoint at line, dbx stops your

program and deletes the temporary breakpoint. The

keywords at and to are equivalent.

cont in procedure

Sets a temporary breakpoint to stop execution upon

entering the speciﬁed procedure, then resumes execution

with the current line. When your program reaches the

breakpoint in procedure, dbx stops your program and

deletes the temporary breakpoint.

If your program stopped because dbx caught a signal intended for your

program, then dbx will send that signal to your program when you continue

execution. You can also explicitly send a signal to your program when you

continue execution. Sending signals to your program upon continuation is

discussed in “Continuing After Catching a Signal” on page 75.

When you debug multiprocess programs, the resume command can be more

helpful than the cont command. Refer to “Resuming a Suspended Process”

on page 102 for more information about the resume command.

Tracing Program Execution

The trace command allows you to observe the progress of your program as

it executes. With it, you can print:

• values of variables at speciﬁc points in your program or whenever

variables change value

• parameters passed to and values returned from functions

Each trace is assigned a number when you create it. Use this number to

reference the trace in the various commands provided for manipulating

traces (for example, disable, enable, and delete, all described in “Managing

Breakpoints, Traces, and Conditional Commands” on page 70).