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Command: crashme | Section: 9 | Source: NetBSD | File: crashme.9
CRASHME(9) FreeBSD Kernel Developer's Manual CRASHME(9)
NAME
crashme, crashme_add, crashme_remove - in-kernel testing of crash
handling
SYNOPSIS
#include <sys/crashme.h>
int
crashme_add(crashme_node *cn);
int
crashme_remove(crashme_node *cn);
DESCRIPTION
The crashme functions provide access to dynamically add and remove
crashme nodes. These nodes are simply named callbacks that are expected
to cause the system to crash.
The crashme functionality is only available in kernels with the
options(4) DEBUG option set.
Each crashme node is maintained in a crashme_node structure which has the
following public members:
typedef int (*crashme_fn)(int);
typedef struct crashme_node {
const char *cn_name;
const char *cn_longname;
crashme_fn cn_fn;
} crashme_node;
The caller must fill in the cn_name, cn_longname, and cn_fn members.
The flags parameter is passed from sysctl. The return value is 0 upon
success or non zero for failure.
SYSCTL SUPPORT
The following sysctl(8) variables are provided by the crashme subsystem:
debug.crashme_enable
Must be set to 1 for any crashme node to be executed.
The following sysctl(8) nodes trigger crashes in different ways when
written:
debug.crashme.panic Call panic(9).
debug.crashme.null_deref Dereference a null pointer.
debug.crashme.null_jump Call a null function pointer, i.e., jump to the
instruction address zero.
debug.crashme.ddb Enter ddb(9) directly by calling Debugger(9).
Requires options(4) DDB.
SEE ALSO
options(4), panic(9)
HISTORY
The crashme driver appeared in NetBSD 9.0.
AUTHORS
Matthew R. Green
FreeBSD 14.1-RELEASE-p8 January 7, 2019 FreeBSD 14.1-RELEASE-p8