Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/bpf.h>
3#include <bpf/bpf_helpers.h>
4
5struct __bpf_stdout__ {
6 __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
7 __type(key, int);
8 __type(value, __u32);
9 __uint(max_entries, __NR_CPUS__);
10} __bpf_stdout__ SEC(".maps");
11
12#define puts(from) \
13 ({ const int __len = sizeof(from); \
14 char __from[sizeof(from)] = from; \
15 bpf_perf_event_output(args, &__bpf_stdout__, BPF_F_CURRENT_CPU, \
16 &__from, __len & (sizeof(from) - 1)); })
17
18struct syscall_enter_args;
19
20SEC("raw_syscalls:sys_enter")
21int sys_enter(struct syscall_enter_args *args)
22{
23 puts("Hello, world\n");
24 return 0;
25}
26
27char _license[] SEC("license") = "GPL";