INTRODUCTION TO THE DEBUGGERS in Software

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2 INTRODUCTION TO THE DEBUGGERS
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Setting Up the Debuggers
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Even in their basic usage, the Windows debuggers provide exceptional and valuable flexibility, while also forcing you to choose among their various options This section details those options that enable you to configure the debugger for all cases presented in this book
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Introduction to the Debuggers
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Debuggers need at least two key ingredients to perform at full capacity: the target image being debugged and the symbol information associated with that image In this section, we focus on setting up the debugger target The later section Setting Up and Using the Symbols shows how to load the associated symbols for the debugger target Some examples from this section use cdbexe, but they work similarly with windbgexe or ntsdexe In the most common situation, the debugger starts a new process, and the target image is loaded in the newly created process that becomes the debugger target Using the tlistexe executable (located in the debugger installation folder), you can see the debugger as the parent of the debugged process The executable name is passed in as a parameter to the debuggers, as you can see in Listing 21 The command line starting the debugger shows as cdb 02sampleexe The debugger cdbexe having the process identifier 2428 is the parent for the process 02sampleexe having the process identifier 2816 Listing 21 Listing all processes as task tree
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C:\> REM tlist with t parameter displays the process tree C:\> tlist t tlist will display the process tree System Process (0) System (4) smssexe (756) csrssexe (836) winlogonexe (864) servicesexe (908) svchostexe (1080) svchostexe (1152) svchostexe (1216) svchostexe (1348) svchostexe (1408) spoolsvexe (1748) svchostexe (572) svchostexe (1688) lsassexe (920) explorerexe (3552) Program Manager cmdexe (2856) C:\WINDOWS\system32\cmdexe - tlist -t cdbexe (2428) cdb 02sampleexe 02sampleexe (2816) tlistexe (268)
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When debugging a process in which the actual process lifetime is managed by an external entity, one approach is to attach the debugger to the running process The Debugging Scenarios section toward the end of this chapter describes additional options to debug such a process This is the approach used when debugging Windows services, DCOM servers, IIS filters, and so on Listing 22 shows the list of switches that can be used when attaching to an already running process Listing 22 Options for attaching the debugger to a running process
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C:\>cdb - cdb version 6400043 usage: cdb [options] Options: <command-line> command to run under the debugger equivalent to -G -g -o -p -1 -d -pd [ more] -p <pid> specifies the decimal process ID to attach to -pn <name> specifies the name of the process to attach to -psn <name> specifies the process to attach to by service name -pv specifies that any attach should be noninvasive -pvr specifies that any attach should be noninvasive and nonsuspending
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2 INTRODUCTION TO THE DEBUGGERS
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Although most options displayed by the command help are self-explanatory, we will stress a few helpful parameters to use when you are attaching the debugger to a running process cdbexe p <pid> is the standard command used when the process identifier is known If the image name is known (as is the case with DCOM servers or with SCM services), cdbexe pn <image name> does an excellent job in finding its process identifier and attaching to it However, if multiple processes are started with the same image, the command bails out, as shown here:
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C:\>cdb -pn svchostexe There is more than one svchostexe process running instance you are interested in and use -p <pid> Find the process ID of the
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In this case, we find the target process identifier using tlistexe and use it as parameter for the cdb p <pid> command Special for service writers sharing the same host image name, it is possible to specify a service name as a parameter: cdb psn
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