Computer Science
QUERY_MODULE(2) Linux Module Support QUERY_MODULE(2)
NAME
query_module - query the kernel for various bits pertain-
ing to modules.
SYNOPSIS
#include <linux/module.h>
int query_module(const char *name, int which,
void *buf, size_t bufsize, size_t *ret);
DESCRIPTION
query_module requests information related to loadable mod-
ules from the kernel. The precise nature of the informa-
tion and its format depends on the which subfunction.
Some functions require name to name a currently loaded
module, some allow name to be NULL indicating the kernel
proper.
VALUES OF WHICH
0 Always returns success. Used to probe for the sys-
tem call.
QM_MODULES
Returns the names of all loaded modules. The out-
put buffer format is adjacent null-terminated
strings; ret is set to the number of modules.
QM_DEPS
Returns the names of all modules used by the indi-
cated module. The output buffer format is adjacent
null-terminated strings; ret is set to the number
of modules.
QM_REFS
Returns the names of all modules using the indi-
cated module. This is the inverse of QM_DEPS. The
output buffer format is adjacent null-terminated
strings; ret is set to the number of modules.
QM_SYMBOLS
Returns the symbols and values exported by the ker-
nel or the indicated module. The buffer format is
an array of:
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 miscelaneous information about the indi-
cated 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, et al that indicates the current
status of the module. ret is set to the size of
the module_info struct.
RETURN VALUE
On success, zero is returned. On error, -1 is returned
and errno is set appropriately.
ERRORS
ENOENT No module by that name exists.
EINVAL Invalid which, or name indicates the kernel for an
inappropriate subfunction.
ENOSPC The buffer size provided was too small. ret is set
to the minimum size needed.
EFAULT At least one of name, buf, or ret was outside the
program's accessible address space.
SEE ALSO
create_module(2), init_module(2), delete_module(2).
Linux 2.1.17 26 Dec 1996 1
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