dbx is a tool for source-level debugging and execution of programs. It allows you to determine the exact statement that caused a core dump, or to monitor the. A Short User Manual for dbx. “dbx” is the name of the debugger that is available for use on many Unix systems. This document is intended to list the most. There is a fancier X-windows interface for AIX, invoked with the command xde, The dbx debugger is able to track the execution of your program line-by-line in the first at the file containing the main program and is waiting for instructions.

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The at Address flag is specified, and the instruction at Address is run. Only the dbx version information is printed before the prompt is displayed. Dxb information about all rwlocks whose status is in write mode. Indicates the kernel thread identifier if the user thread is attached to a kernel thread.

When the thread ends, the tskip count associated with it is deleted. The dbx debug program associates a number with each ttrace subcommand.

When a thread-level and a process-level breakpoint are hit at the same time, both the breakpoints are processed and the thread-level breakpoint is reported. When set, also sets the following variables, placing the dbx command in a mode to debug Java applications.

dbx Command

Run the program up to the next source line nexti subcommand for dbx: The program is stopped when:. Displays information about the process. Upon evaluation of the special directory, when one or more path mappings are specified, if the RegularExpression portion of a path mapping matches the first n aux of the full-path name information in the object file and the substitution of the NewPath portion of the path mapping yields a readable file, this file is used.


Using the raw option causes output to be displayed in raw hex format. Using the atfork option, the names of routines registered as preparent and child atfork handlers are displayed with their respective arguments in the case of non-posix compliant atfork handlers.

The registers subcommand displays the values of general-purpose registers, system control registers, floating-point registers, vector registers, and the current instruction register.

The list subcommand displays a specified number of lines of the source file. Continue running a program until a return is reached run subcommand for dbx: If the screen subcommand is issued in a non-Xwindow environment, the dbx program displays a warning message and resumes debugging as if the screen subcommand was not given.

Use the status subcommand to view the remaining tskip count for the threads. Each file can contain a list of dbx subcommands that will be run before the dbx prompt is displayed. Removes all breakpoints at an address. The tstopi subcommand sets an instruction-level breakpoint stop for a thread.

The executable-file argument is an load module produced by a compiler. The number of lines displayed are specified in one of following ways:. The information displayed by the thread subcommand in the second format is given below.

The call subcommand cannot be used to call functions that take vector parameters.

A full list of dbx commands

The title for each child window is the process ID pid of the child process. Read subcommands from a file status subcommand for dbx: Indicates the number of threads waiting on the condition variable. Entering the help subcommand with the Subcommand parameter displays the syntax statement and description of the specified subcommand. Multiple substitutions are separated by colons. Runs the object file immediately.

dbx — Use the debugger

The following is an example where the x variable is an integer with value To continue execution until the second breakpoint is encountered, enter:.

This operator is used to fetch the free space or allocation node to which the specified address belongs to. If no signal is specified, the program continues as if no stop occurred.


If no flags are specified, the multproc subcommand returns the status of multiprocess debugging.

Tutorial on dbx (AIX system, like cernsp)

The allocation option to the malloc subcommand displays a sorted list of all the allocations currently held by the process. The path files must match the running copy of the library. Indicates the scope attribute of a thread attributes object. If the MutexNumber parameter is given, the mutex subcommand displays information about the specified mutexes.

Use this subcommand if a symbol needs to be interpreted in a way not consistent with the current language. Changes how the dbx debug program interprets symbols. Specifies the display name for the X Window System, for use with the multproc subcommand or the screen subcommand. Run a specified source line gotoi subcommand for dbx: Redirects standard error to File. To open an Xwindow for dbx command interaction, enter:. If no file is specified, the editor is started on the current source file.

The where subcommand displays a list of active procedures and functions associated with the frame numbers startframe to endframe. Causes the dbx command to skip the validity checking of the core file. See the rerun subcommand. Signal names are not case-sensitive.

Thread-level trace can be set only for system-scope threads. They make it easier for the user to express source file locations in the case that entire directory structures of source files are relocated after compilation. If the mutex is locked, indicates the symbolic name of the user thread which holds the mutex. Prints a string of characters terminated by a null byte.