kgdb(1) [freebsd man page]
KGDB(1) BSD General Commands Manual KGDB(1) NAME
kgdb -- kernel debugger SYNOPSIS
kgdb [-a | -f | -fullname] [-b rate] [-q | -quiet] [-v] [-w] [-d crashdir] [-c core | -n dumpnr | -r device] [kernel [core]] DESCRIPTION
The kgdb utility is a debugger based on gdb(1) that allows debugging of kernel core files. The options are as follows: -a Increase the annotation level. An annotation level of 1 features the historical -fullname option of gdb(1). This is useful when running kgdb in Emacs. The -f or -fullname options are supported for backward compatibility as well. -b rate Set the baudrate to rate. -q Suppress printing of the banner when the debugger starts. The -quiet form is supported for compatibility as well. -v Increase verbosity. -w Opens kmem-based targets in read-write mode. (This is identical to what --wcore used to do in previous gdb versions for FreeBSD.) -d crashdir Use crashdir instead of the default, /var/crash to locate kernel core dump files in. The name vmcore. plus the dump number will be appended to determine the actual dump file name. -c core Explicitly use core as the core dump file. -n dumpnr Use the kernel core dump file numbered dumpnr for debugging. -r device Use device to connect kgdb to for a remote debugging session. The -c, -n, and -r options are mutually exclusive. Optionally, the name of the kernel symbol file and the name of the core dump file can be supplied on the command-line as positional argu- ments. If no kernel symbol file name has been given, the symbol file of the currently running kernel will be used. If no core dump file has been specified through either of the options or the last command-line argument, /dev/mem will be opened to allow debugging the currently run- ning kernel. FILES
/dev/mem Default memory image to open if no core dump file has been specified. /var/crash Default directory to locate kernel core dump files. SEE ALSO
gdb(1) HISTORY
The kgdb utility first appeared in its current form in FreeBSD 5.3. BSD
October 11, 2006 BSD
Check Out this Related Man Page
tnfxtract(1) User Commands tnfxtract(1) NAME
tnfxtract - extract kernel probes output into a trace file SYNOPSIS
tnfxtract [-d dumpfile -n namelist] tnf_file DESCRIPTION
The tnfxtract utility collects kernel trace output from an in-core buffer in the Solaris kernel, or from the memory image of a crashed sys- tem, and generates a binary TNF trace file like those produced directly by user programs being traced. Either both or neither of the -d and -n options must be specified. If neither is specified, trace output is extracted from the running ker- nel. If both are specified, the -d argument names the file containing the (crashed) system memory image, and the -n argument names the file containing the symbol table for the system memory image. The TNF trace file tnf_file produced is exactly the same size as the in-core buffer; it is essentially a snapshot of that buffer. It is legal to run tnfxtract while kernel tracing is active, i.e., while the in-core buffer is being written. tnfxtract insures that the output file it generates is low-level consistent, that is, that only whole probes are written out, and that internal data structures in the buffer are not corrupted because the buffer is being concurrently written. The TNF trace file generated is suitable as input to tnfdump(1), which will generate an ASCII file. OPTIONS
The following options are supported: -d dumpfile Uses dumpfile as the system memory image, instead of the running kernel. The dumpfile is normally the path name of a file generated by the savecore utility. -n namelist Uses namelist as the file containing the symbol table information for the given dumpfile. OPERANDS
The following operand is supported: tnf_file Output file generated by tnfxtract based on kernel trace output from an in-core buffer in the Solaris kernel. EXAMPLES
Example 1 Extracting probes from a running kernel Extract probes from the running kernel into ktrace.out: example% tnfxtract ktrace.out Example 2 Extracting probes from a kernel crash dump Extract probes from a kernel crash dump into ktrace.out: example% tnfxtract -d /var/crash/`uname -n`/vmcore.0 -n /var/crash/`uname -n`/unix.0 ktrace.out EXIT STATUS
The following exit values are returned: 0 Successful completion. >0 An error occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWtnfc | +-----------------------------+-----------------------------+ SEE ALSO
prex(1), tnfdump(1), savecore(1M), tnf_kernel_probes(4), attributes(5) SunOS 5.11 19 Aug 2003 tnfxtract(1)