// SPDX-License-Identifier: GPL-2.0 #include <linux/bpf.h> #include <bpf/bpf_helpers.h> struct __bpf_stdout__ { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __type(key, int); __type(value, __u32); __uint(max_entries, __NR_CPUS__); } __bpf_stdout__ SEC(".maps"); #define puts(from) \ ({ const int __len = sizeof(from); \ char __from[sizeof(from)] = from; \ bpf_perf_event_output(args, &__bpf_stdout__, BPF_F_CURRENT_CPU, \ &__from, __len & (sizeof(from) - 1)); }) struct syscall_enter_args; SEC("raw_syscalls:sys_enter") int sys_enter(struct syscall_enter_args *args) { puts("Hello, world\n"); return 0; } char _license[] SEC("license") = "GPL";