get_kernel_syms(2) — Linux manual page

get_kernel_syms(2)         System Calls Manual        get_kernel_syms(2)

NAME

       get_kernel_syms - retrieve exported kernel and module symbols

SYNOPSIS

       #include <linux/module.h>

       [[deprecated]] int get_kernel_syms(struct kernel_sym *table);

DESCRIPTION

       Note: This system call is present only 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.

STANDARDS

       Linux.

HISTORY

       Removed in Linux 2.6.

       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 glibc 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

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Linux man-pages 6.9.1          2024-05-02             get_kernel_syms(2)

Pages that refer to this page: query_module(2), syscalls(2)

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