query_module — query the kernel for various bits pertaining to modules
#include <linux/module.h>
int
query_module( |
const char * | name, |
int | which, | |
void * | buf, | |
size_t | bufsize, | |
size_t * | ret) ; |
query_module
() requests
information from the kernel about loadable modules. The
returned information is placed in the buffer pointed to by
buf
. The caller must
specify the size of buf
in bufsize
. The precise nature and
format of the returned information depend on the operation
specified by which
.
Some operations require name
to identify a currently
loaded module, some allow name
to be NULL, indicating the
kernel proper.
The following values can be specified for which
:
0
Always returns success. Used to probe for availability of the system call.
QM_MODULES
Returns the names of all loaded modules. The
returned buffer consists of a sequence of
null-terminated strings; ret
is set to the number
of modules.
QM_DEPS
Returns the names of all modules used by the
indicated module. The returned buffer consists of a
sequence of null-terminated strings; ret
is set to the number
of modules.
QM_REFS
Returns the names of all modules using the indicated
module. This is the inverse of QM_DEPS
. The returned buffer consists
of a sequence of null-terminated strings; ret
is set to the number
of modules.
QM_SYMBOLS
Returns the symbols and values exported by the kernel or the indicated module. The returned buffer is an array of structures of the following form
struct module_symbol { }; unsigned long value
;unsigned long name
;followed by null-terminated strings. The value of
name
is the character offset of the string relative to the start ofbuf
;ret
is set to the number of symbols.
QM_INFO
Returns miscellaneous information about the indicated module. The output buffer format is:
struct module_info { }; unsigned long address
;unsigned long size
;unsigned long flags
;where
address
is the kernel address at which the module resides,size
is the size of the module in bytes, andflags
is a mask ofMOD_RUNNING
,MOD_AUTOCLEAN
, etc. that indicates the current status of the module (see the kernel source fileinclude/linux/module.h
).ret
is set to the size of themodule_info
structure.
At least one of name
, buf
, or ret
was outside the
program's accessible address space.
Invalid which
; or name
is NULL (indicating
"the kernel"), but this is not permitted with the
specified value of which
.
No module by that name
exists.
The buffer size provided was too small. ret
is set to the minimum
size needed.
This system call is only present on Linux up until kernel
2.4; it was removed in Linux 2.6. Some of the information
that was available via query_module
() can be obtained from
/proc/modules
, /proc/kallsyms
, and /sys/modules
.
create_module(2), delete_module(2), get_kernel_syms(2), init_module(2)
|