examples/bpf/bpf_sys.h

   1 #ifndef __BPF_SYS__
   2 #define __BPF_SYS__
   3
   4 #include <sys/syscall.h>
   5 #include <linux/bpf.h>
   6
   7 static inline __u64 bpf_ptr_to_u64(const void *ptr)
   8 {
   9         return (__u64) (unsigned long) ptr;
  10 }
  11
  12 static inline int bpf_lookup_elem(int fd, void *key, void *value)
  13 {
  14         union bpf_attr attr = {
  15                 .map_fd         = fd,
  16                 .key            = bpf_ptr_to_u64(key),
  17                 .value          = bpf_ptr_to_u64(value),
  18         };
  19
  20         return syscall(__NR_bpf, BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
  21 }
  22
  23 #endif /* __BPF_SYS__ */