NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON
QUERY_MODULE(2) Linux Programmer's Manual QUERY_MODULE(2)
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 Returns success, if the kernel supports query_module(). 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 of buf; 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, and flags is a mask of MOD_RUNNING,
MOD_AUTOCLEAN, etc. that indicates the current status of the module
(see the kernel source file include/linux/module.h). ret is set to the
size of the module_info structure.
On success, zero is returned. On error, -1 is returned and errno is set
appropriately.
EFAULT At least one of name, buf, or ret was outside the program's accessible
address space.
EINVAL Invalid which; or name is NULL (indicating "the kernel"), but this is
not permitted with the specified value of which.
ENOENT No module by that name exists.
ENOSPC The buffer size provided was too small. ret is set to the minimum size
needed.
ENOSYS query_module() is not supported in this version of the kernel.
query_module() is Linux-specific.
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)
This page is part of release 3.23 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be found
at http://www.kernel.org/doc/man-pages/.
Linux 2007-06-03 QUERY_MODULE(2)