gcc/doc/gcc/extensions-to-the-c-language-family/declaring-attributes-of-functions/bpf-function-attributes.rst

   1 ..
   2   Copyright 1988-2022 Free Software Foundation, Inc.
   3   This is part of the GCC manual.
   4   For copying conditions, see the copyright.rst file.
   5
   6 .. _bpf-function-attributes:
   7
   8 BPF Function Attributes
   9 ^^^^^^^^^^^^^^^^^^^^^^^
  10
  11 These function attributes are supported by the BPF back end:
  12
  13 .. index:: kernel helper, function attribute, BPF
  14
  15 .. bpf-fn-attr:: kernel_helper
  16
  17   use this attribute to indicate the specified function declaration is a
  18   kernel helper.  The helper function is passed as an argument to the
  19   attribute.  Example:
  20
  21   .. code-block:: c++
  22
  23     int bpf_probe_read (void *dst, int size, const void *unsafe_ptr)
  24       __attribute__ ((kernel_helper (4)));