NAME
query_module - query the kernel for various bits pertaining 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 modules from the kernel. The precise nature of the information and its format depends on the which sub function. Some functions require name to name a currently loaded module, some allow name to be NULL indicating the kernel proper.
VALUES OF WHICH
- Always returns success. Used to probe for the system call.
- QM_MODULES
- Returns the names of all loaded modules. The output 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 indicated 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 indicated 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 kernel 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 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, 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 sub function.
- 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).
