get_kernel_syms

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 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 5.10 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/.



Linux                              2017-09-15                 GET_KERNEL_SYMS(2)