QUERY_MODULE(2) | Linux Programmer's Manual | QUERY_MODULE(2) |
query_module - query the kernel for various bits pertaining to modules
#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:
struct module_symbol {
unsigned long value;
unsigned long name; };
struct module_info {
unsigned long address;
unsigned long size;
unsigned long flags; };
On success, zero is returned. On error, -1 is returned and errno is set appropriately.
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 4.16 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/.
2017-09-15 | Linux |