tools/testing/selftests/bpf/prog_tests/task_fd_query_rawtp.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/prog_tests/task_fd_query_rawtp.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/prog_tests/task_fd_query_rawtp.c
Extension
.c
Size
2418 bytes
Lines
76
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 <test_progs.h>

void test_task_fd_query_rawtp(void)
{
	const char *file = "./test_get_stack_rawtp.bpf.o";
	__u64 probe_offset, probe_addr;
	__u32 len, prog_id, fd_type;
	struct bpf_object *obj;
	int efd, err, prog_fd;
	__u32 duration = 0;
	char buf[256];

	err = bpf_prog_test_load(file, BPF_PROG_TYPE_RAW_TRACEPOINT, &obj, &prog_fd);
	if (CHECK(err, "prog_load raw tp", "err %d errno %d\n", err, errno))
		return;

	efd = bpf_raw_tracepoint_open("sys_enter", prog_fd);
	if (CHECK(efd < 0, "raw_tp_open", "err %d errno %d\n", efd, errno))
		goto close_prog;

	/* query (getpid(), efd) */
	len = sizeof(buf);
	err = bpf_task_fd_query(getpid(), efd, 0, buf, &len, &prog_id,
				&fd_type, &probe_offset, &probe_addr);
	if (CHECK(err < 0, "bpf_task_fd_query", "err %d errno %d\n", err,
		  errno))
		goto close_prog;

	err = fd_type == BPF_FD_TYPE_RAW_TRACEPOINT &&
	      strcmp(buf, "sys_enter") == 0;
	if (CHECK(!err, "check_results", "fd_type %d tp_name %s\n",
		  fd_type, buf))
		goto close_prog;

	/* test zero len */
	len = 0;
	err = bpf_task_fd_query(getpid(), efd, 0, buf, &len, &prog_id,
				&fd_type, &probe_offset, &probe_addr);
	if (CHECK(err < 0, "bpf_task_fd_query (len = 0)", "err %d errno %d\n",
		  err, errno))
		goto close_prog;
	err = fd_type == BPF_FD_TYPE_RAW_TRACEPOINT &&
	      len == strlen("sys_enter");
	if (CHECK(!err, "check_results", "fd_type %d len %u\n", fd_type, len))
		goto close_prog;

	/* test empty buffer */
	len = sizeof(buf);
	err = bpf_task_fd_query(getpid(), efd, 0, 0, &len, &prog_id,
				&fd_type, &probe_offset, &probe_addr);
	if (CHECK(err < 0, "bpf_task_fd_query (buf = 0)", "err %d errno %d\n",
		  err, errno))
		goto close_prog;
	err = fd_type == BPF_FD_TYPE_RAW_TRACEPOINT &&
	      len == strlen("sys_enter");
	if (CHECK(!err, "check_results", "fd_type %d len %u\n", fd_type, len))
		goto close_prog;

	/* test smaller buffer */
	len = 3;
	err = bpf_task_fd_query(getpid(), efd, 0, buf, &len, &prog_id,
				&fd_type, &probe_offset, &probe_addr);
	if (CHECK(err >= 0 || errno != ENOSPC, "bpf_task_fd_query (len = 3)",
		  "err %d errno %d\n", err, errno))
		goto close_prog;
	err = fd_type == BPF_FD_TYPE_RAW_TRACEPOINT &&
	      len == strlen("sys_enter") &&
	      strcmp(buf, "sy") == 0;
	if (CHECK(!err, "check_results", "fd_type %d len %u\n", fd_type, len))
		goto close_prog;

close_prog:
	bpf_object__close(obj);
}

Annotation

Implementation Notes