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GET_KERNEL_SYMS(2)                                                      Linux Programmer's Manual                                                     GET_KERNEL_SYMS(2)

NAME
       get_kernel_syms - retrieve exported kernel and module symbols

SYNOPSIS
       #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.

DESCRIPTION
       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.

RETURN VALUE
       On success, returns the number of symbols copied to table.  On error, -1 is returned and errno is set to indicate the error.

ERRORS
       There is only one possible error return:

       ENOSYS get_kernel_syms() is not supported in this version of the kernel.

VERSIONS
       This system call is present on Linux only up until kernel 2.4; it was removed in Linux 2.6.

CONFORMING TO
       get_kernel_syms() is Linux-specific.

NOTES
       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; alter‐
       natively, you could invoke the system call using syscall(2).

BUGS
       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 de‐
       scribed on its manual page).

SEE ALSO
       create_module(2), delete_module(2), init_module(2), query_module(2)

Linux                                                                          2021-03-22                                                             GET_KERNEL_SYMS(2)