|
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | 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);
Note: No declaration of this system call is provided in glibc
headers; see NOTES.
Note: This system call is present only in kernels before Linux
2.6.
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, and so on,
that indicates the current status of the module (see the
Linux 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 to indicate the error.
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 (e.g., the kernel is version 2.6 or later).
This system call is present on Linux only up until kernel 2.4; it
was removed in Linux 2.6.
query_module() is Linux-specific.
Some of the information that was formerly available via
query_module() can be obtained from /proc/modules,
/proc/kallsyms, and the files under the directory /sys/module.
The query_module() system call is not supported by glibc. No
declaration is provided in glibc headers, but, through a quirk of
history, glibc does export an ABI for this system call.
Therefore, in order to employ this system call, it is sufficient
to manually declare the interface in your code; alternatively,
you can invoke the system call using syscall(2).
create_module(2), delete_module(2), get_kernel_syms(2),
init_module(2), lsmod(8), modinfo(8)
This page is part of release 5.13 of the Linux man-pages project.
A description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
Linux 2021-03-22 QUERY_MODULE(2)
Pages that refer to this page: create_module(2), delete_module(2), get_kernel_syms(2), init_module(2), syscalls(2)
Copyright and license for this manual page
|
HTML rendering created 2022-12-18 by Michael Kerrisk, author of The Linux Programming Interface, maintainer of the Linux man-pages project. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|