tools/testing/selftests/bpf/progs/test_lookup_and_delete.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include "vmlinux.h"
   4 #include <bpf/bpf_helpers.h>
   5
   6 __u32 set_pid = 0;
   7 __u64 set_key = 0;
   8 __u64 set_value = 0;
   9
  10 struct {
  11         __uint(type, BPF_MAP_TYPE_HASH);
  12         __uint(max_entries, 2);
  13         __type(key, __u64);
  14         __type(value, __u64);
  15 } hash_map SEC(".maps");
  16
  17 SEC("tp/syscalls/sys_enter_getpgid")
  18 int bpf_lookup_and_delete_test(const void *ctx)
  19 {
  20         if (set_pid == bpf_get_current_pid_tgid() >> 32)
  21                 bpf_map_update_elem(&hash_map, &set_key, &set_value, BPF_NOEXIST);
  22
  23         return 0;
  24 }
  25
  26 char _license[] SEC("license") = "GPL";