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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | VERSIONS | SEE ALSO | COLOPHON |
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query_module(2) System Calls Manual query_module(2)
query_module - query the kernel for various bits pertaining to
modules
#include <linux/module.h>
[[deprecated]] int query_module(const char *name, int which,
void buf[.bufsize], size_t bufsize,
size_t *ret);
Note: This system call is present only 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., Linux 2.6 or later).
Linux.
Removed in Linux 2.6.
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 the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.10.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-02-02. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.10 2024-05-02 query_module(2)
Pages that refer to this page: create_module(2), delete_module(2), get_kernel_syms(2), init_module(2), syscalls(2)
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HTML rendering created 2025-02-02 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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