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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON |
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QUERY_MODULE(2) Linux Programmer's Manual QUERY_MODULE(2)
query_module - query the kernel for various bits pertaining to mod‐
ules
#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 indi‐
cates 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 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
(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 4.15 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 2017-09-15 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
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