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

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/progs/test_ringbuf_n.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/test_ringbuf_n.c
Extension
.c
Size
860 bytes
Lines
48
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

struct sample {
	int pid;
	long value;
	char comm[16];
};

struct {
	__uint(type, BPF_MAP_TYPE_RINGBUF);
} ringbuf SEC(".maps");

int pid = 0;
long value = 0;

SEC("fentry/" SYS_PREFIX "sys_getpgid")
int test_ringbuf_n(void *ctx)
{
	int cur_pid = bpf_get_current_pid_tgid() >> 32;
	struct sample *sample;

	if (cur_pid != pid)
		return 0;

	sample = bpf_ringbuf_reserve(&ringbuf, sizeof(*sample), 0);
	if (!sample)
		return 0;

	sample->pid = pid;
	sample->value = value;
	bpf_get_current_comm(sample->comm, sizeof(sample->comm));

	bpf_ringbuf_submit(sample, 0);

	return 0;
}

Annotation

Implementation Notes