>> ddb (8) ( FreeBSD man: Команды системного администрирования )
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NAME
ddb
- configure DDB kernel debugger properties
SYNOPSIS
capture
[-M core
]
[-N system
]
print capture
[-M core
]
[-N system
]
status scriptscriptname scriptscriptname = script scripts unscriptscriptname pathname
DESCRIPTION
The
utility configures certain aspects of the
ddb(4)
kernel debugger from user space that are not configured at compile-time or
easily via
sysctl(8)
MIB entries.
To ease configuration, commands can be put in a file which is processed using
as shown in the last synopsis line.
An absolute
pathname
must be used.
The file will be read line by line and applied as arguments to the
utility.
Whitespace at the beginning of lines will be ignored as will lines where the
first non-whitespace character is
`#'
OUTPUT CAPTURE
The
utility can be used to extract the contents of the
ddb(4)
output capture buffer of the current live kernel, or from the crash dump of a
kernel on disk.
The following debugger commands are available from the command line:
capture
[-M core
]
[-N system
]
print
Print the current contents of the
ddb(4)
output capture buffer.
capture
[-M core
]
[-N system
]
status
Print the current status of the
ddb(4)
output capture buffer.
SCRIPTING
The
utility can be used to configure aspects of
ddb(4)
scripting from user space; scripting support is described in more detail in
ddb(4).
Each of the debugger commands is available from the command line:
script scriptname
Print the script named
scriptname
script scriptname = script
Define a script named
scriptname
As many scripts contain characters interpreted in special ways by the shell,
it is advisable to enclose
script
in quotes.
scripts
List currently defined scripts.
unset scriptname
Delete the script named
scriptname
EXIT STATUS
Ex -std
EXAMPLES
The following example defines a script that will execute when the kernel
debugger is entered as a result of a break signal:
ddb script kdb.enter.break="show pcpu; bt"
The following example will delete the script:
"ddb unscript kdb.enter.break"
For further examples, see the
ddb(4)
and
textdump(4)
manual pages.
