redhat man page for query_module

QUERY_MODULE(2) 					       Linux Module Support						   QUERY_MODULE(2)

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
       0      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).

Linux 2.1.17							    26 Dec 1996 						   QUERY_MODULE(2)