get_kernel_syms - retrieve exported kernel and module symbols
#include <linux/module.h>
int get_kernel_syms(struct kernel_sym *table);
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.
If
table is NULL,
get_kernel_syms() returns the number of symbols
available for query. Otherwise, it fills in a table of structures:
struct kernel_sym {
unsigned long value;
char name[60];
};
The symbols are interspersed with magic symbols of the form
#module-name with the kernel having an empty name. The value
associated with a symbol of this form is the address at which the module is
loaded.
The symbols exported from each module follow their magic module tag and the
modules are returned in the reverse of the order in which they were loaded.
On success, returns the number of symbols copied to
table. On error, -1
is returned and
errno is set appropriately.
There is only one possible error return:
- ENOSYS
- get_kernel_syms() is not supported in this version of the
kernel.
This system call is present on Linux only up until kernel 2.4; it was removed in
Linux 2.6.
get_kernel_syms() is Linux-specific.
This obsolete system call is not supported by glibc. No declaration is provided
in glibc headers, but, through a quirk of history, glibc versions before 2.23
did export an ABI for this system call. Therefore, in order to employ this
system call, it was sufficient to manually declare the interface in your code;
alternatively, you could invoke the system call using
syscall(2).
There is no way to indicate the size of the buffer allocated for
table.
If symbols have been added to the kernel since the program queried for the
symbol table size, memory will be corrupted.
The length of exported symbol names is limited to 59 characters.
Because of these limitations, this system call is deprecated in favor of
query_module(2) (which is itself nowadays deprecated in favor of other
interfaces described on its manual page).
create_module(2),
delete_module(2),
init_module(2),
query_module(2)