GET_KERNEL_SYMS(2)        (2017-09-15)         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

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     GET_KERNEL_SYMS(2)        (2017-09-15)         GET_KERNEL_SYMS(2)

          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 charac-
          ters.

          Because of these limitations, this system call is deprecated
          in favor of query_module(2) (which is itself nowadays depre-
          cated 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/.

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