focal (2) get_kernel_syms.2.gz

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
       appropriately.

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; alternatively, 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 described on its manual page).

SEE ALSO

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

COLOPHON

       This page is part of release 5.05 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/.