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 4.15 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/.