samples/bpf/trace_output_kern.c

0001 #include <linux/ptrace.h>
0002 #include <linux/version.h>
0003 #include <uapi/linux/bpf.h>
0004 #include <bpf/bpf_helpers.h>
0005 #include "trace_common.h"
0006
0007 struct {
0008     __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
0009     __uint(key_size, sizeof(int));
0010     __uint(value_size, sizeof(u32));
0011     __uint(max_entries, 2);
0012 } my_map SEC(".maps");
0013
0014 SEC("kprobe/" SYSCALL(sys_write))
0015 int bpf_prog1(struct pt_regs *ctx)
0016 {
0017     struct S {
0018         u64 pid;
0019         u64 cookie;
0020     } data;
0021
0022     data.pid = bpf_get_current_pid_tgid();
0023     data.cookie = 0x12345678;
0024
0025     bpf_perf_event_output(ctx, &my_map, 0, &data, sizeof(data));
0026
0027     return 0;
0028 }
0029
0030 char _license[] SEC("license") = "GPL";
0031 u32 _version SEC("version") = LINUX_VERSION_CODE;