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 if Condition flag is used, and the Condition is true. List active procedures and functions whereis subcommand for dbx: If the set-o vi or set edit vi command is given, you are placed in the input mode of the vi line editor. 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. The move subcommand changes the next line to be displayed to the line specified by the SourceLine parameter.
The following topics are available:. Lists dbx subcommands for accessing source files. Likewise, if debugging a core file, if the variable was not on when the process ran, the onceblock subcommand is not able to obtain any information.
If the variable is set and the identifier name is four or more characters longer than the specified limit, the dbx command prints the specified number of characters of the original identifier name in the stack trace followed by three periods The tnext subcommand runs the running thread up to sbx next aiz line. The specified thread is stopped when any of the following occurs: Stops the dbx debug program.
The dbx debugger
Causes symbols to be interpreted as uppercase. Item Description tid Indicates the user thread identifier if the user thread is attached to a kernel thread. Thread-level trace can be set only for system-scope threads. All active processes that belong to you are displayed as follows: Displays information about all the mutexes held by a particular thread. The at SourceLine flag is used, and the SourceLine line number is reached.
Stop execution of a program stopi subcommand for dbx: Causes symbols to be interpreted as they actually appear.
The -B flag is used to specify an alternative object file or a separate. A condition can be any dbx expression that evaluates to a true or false value. For more information, see the set subcommand for the dbx command. This option is ignored and remains only for compatibility purposes.
Display the value of registers rerun subcommand for dbx: Appends output and standard error to File. This is accomplished by specifying the —g or —Wc,debug compiler flags on the compiler command line. See the unset subcommand.
Prints a byte as a character. The tracei subcommand turns on tracing when:. Continue running a program until a return is reached run subcommand for dbx: Repeats the previous command if no command was entered. A thread-level hardware watchpoint and a process-level hardware watchpoint can coexist and do not conflict with each other. Display lines of the current source file listfiles subcommand for dbx: Prints an 8-byte unsigned octal number.
Item Description all Removes all the manuak subcommands associated with the specified event.
Analyzing core Dumps with the dbx Command in AIX
See the assign subcommand, the call subcommand, and the set subcommand. You override an expression type by using a renaming or casting operator. The Number parameter specifies the number of times the nexti subcommand runs.
The tracei subcommand is designed to trace addresses. Id[y]” dbx px 0x7e. The traces and stops to be removed can be specified through the Number parameters, or all traces and stops can be removed by using the all flag.
The printbp subcommand instructs the dbx command to print the number of times that each of the breakpoints or all the subcommands were run and the details of the limit on the breakpoint, if a limit was set on it. This value can be running, creating, suspended, blocked, runnable, or terminated. The -r flag allows you to examine the state of your process in memory even though a core image is not taken.
The kthread subcommand displays information about kernel threads. Redirects output to File. The remaining tskip count, which was set using the tskip subcommand for a thread, can be deleted using the tskip flag. Removes all stops at a particular source line. The Name parameter is the alias being created. Prints a short word in octal.
Indicates the schedpolicy attribute of a thread attributes object. To call a command while running the dbx command, enter:.