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

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

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/test_probe_read_user_str.c
Extension
.c
Size
462 bytes
Lines
26
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

// SPDX-License-Identifier: GPL-2.0

#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>

#include <sys/types.h>

pid_t pid = 0;
long ret = 0;
void *user_ptr = 0;
char buf[256] = {};

SEC("tracepoint/syscalls/sys_enter_nanosleep")
int on_write(void *ctx)
{
	if (pid != (bpf_get_current_pid_tgid() >> 32))
		return 0;

	ret = bpf_probe_read_user_str(buf, sizeof(buf), user_ptr);

	return 0;
}

char _license[] SEC("license") = "GPL";

Annotation

Implementation Notes