KDUMP(1) BSD Reference Manual KDUMP(1)
kdump - display kernel trace data
kdump [-dnlRT] [-e emulation] [-f file] [-m maxdata] [-p pid] [-t [ceinsw]]
kdump displays the kernel trace files produced with ktrace(1) in human- readable format. By default, the file ktrace.out in the current directory is displayed, unless overridden by the -f option. The options are as follows: -d Display all numbers in decimal. By default, values are printed out in hexadecimal. -e emulation Interpret system call maps assuming the named emulation instead of "bsd". For example, to view trace output from a Linux binary, use -e linux. -f file Display the specified file instead of ktrace.out. -l Loop reading the trace file, once the end-of-file is reached, waiting for more data. -m maxdata Display at most maxdata bytes when decoding I/O. -n Suppress ad hoc translations. Normally kdump tries to decode many system calls into a more human-readable format. For example, ioctl(2) values are replaced with the macro name and errno values are replaced with the strerror(3) string. Suppressing this feature yields a more consistent output format and is easily amenable to further processing. -p pid Show output only for the pid specified. -R Display relative timestamps (time since previous entry). -T Display absolute timestamps for each entry (seconds since epoch). -t [ceinsw] Selects which tracepoints to display. See the -t option of ktrace(1) for the definitions of the flags.
ktrace.out default ktrace dump file
The kdump command appeared in 4.4BSD. MirOS BSD #10-current June 6, 1993 1
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