tools/perf/include/bpf/stdio.h

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <bpf.h>
   4
   5 struct bpf_map SEC("maps") __bpf_stdout__ = {
   6        .type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
   7        .key_size = sizeof(int),
   8        .value_size = sizeof(u32),
   9        .max_entries = __NR_CPUS__,
  10 };
  11
  12 static int (*perf_event_output)(void *, struct bpf_map *, int, void *, unsigned long) =
  13         (void *)BPF_FUNC_perf_event_output;
  14
  15 #define puts(from) \
  16         ({ const int __len = sizeof(from); \
  17            char __from[__len] = from; \
  18            perf_event_output(args, &__bpf_stdout__, BPF_F_CURRENT_CPU, \
  19                           &__from, __len & (sizeof(from) - 1)); })