bpf/prog_tests/task_fd_query_rawtp.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <test_progs.h>
0003
0004 void test_task_fd_query_rawtp(void)
0005 {
0006     const char *file = "./test_get_stack_rawtp.o";
0007     __u64 probe_offset, probe_addr;
0008     __u32 len, prog_id, fd_type;
0009     struct bpf_object *obj;
0010     int efd, err, prog_fd;
0011     __u32 duration = 0;
0012     char buf[256];
0013
0014     err = bpf_prog_test_load(file, BPF_PROG_TYPE_RAW_TRACEPOINT, &obj, &prog_fd);
0015     if (CHECK(err, "prog_load raw tp", "err %d errno %d\n", err, errno))
0016         return;
0017
0018     efd = bpf_raw_tracepoint_open("sys_enter", prog_fd);
0019     if (CHECK(efd < 0, "raw_tp_open", "err %d errno %d\n", efd, errno))
0020         goto close_prog;
0021
0022     /* query (getpid(), efd) */
0023     len = sizeof(buf);
0024     err = bpf_task_fd_query(getpid(), efd, 0, buf, &len, &prog_id,
0025                 &fd_type, &probe_offset, &probe_addr);
0026     if (CHECK(err < 0, "bpf_task_fd_query", "err %d errno %d\n", err,
0027           errno))
0028         goto close_prog;
0029
0030     err = fd_type == BPF_FD_TYPE_RAW_TRACEPOINT &&
0031           strcmp(buf, "sys_enter") == 0;
0032     if (CHECK(!err, "check_results", "fd_type %d tp_name %s\n",
0033           fd_type, buf))
0034         goto close_prog;
0035
0036     /* test zero len */
0037     len = 0;
0038     err = bpf_task_fd_query(getpid(), efd, 0, buf, &len, &prog_id,
0039                 &fd_type, &probe_offset, &probe_addr);
0040     if (CHECK(err < 0, "bpf_task_fd_query (len = 0)", "err %d errno %d\n",
0041           err, errno))
0042         goto close_prog;
0043     err = fd_type == BPF_FD_TYPE_RAW_TRACEPOINT &&
0044           len == strlen("sys_enter");
0045     if (CHECK(!err, "check_results", "fd_type %d len %u\n", fd_type, len))
0046         goto close_prog;
0047
0048     /* test empty buffer */
0049     len = sizeof(buf);
0050     err = bpf_task_fd_query(getpid(), efd, 0, 0, &len, &prog_id,
0051                 &fd_type, &probe_offset, &probe_addr);
0052     if (CHECK(err < 0, "bpf_task_fd_query (buf = 0)", "err %d errno %d\n",
0053           err, errno))
0054         goto close_prog;
0055     err = fd_type == BPF_FD_TYPE_RAW_TRACEPOINT &&
0056           len == strlen("sys_enter");
0057     if (CHECK(!err, "check_results", "fd_type %d len %u\n", fd_type, len))
0058         goto close_prog;
0059
0060     /* test smaller buffer */
0061     len = 3;
0062     err = bpf_task_fd_query(getpid(), efd, 0, buf, &len, &prog_id,
0063                 &fd_type, &probe_offset, &probe_addr);
0064     if (CHECK(err >= 0 || errno != ENOSPC, "bpf_task_fd_query (len = 3)",
0065           "err %d errno %d\n", err, errno))
0066         goto close_prog;
0067     err = fd_type == BPF_FD_TYPE_RAW_TRACEPOINT &&
0068           len == strlen("sys_enter") &&
0069           strcmp(buf, "sy") == 0;
0070     if (CHECK(!err, "check_results", "fd_type %d len %u\n", fd_type, len))
0071         goto close_prog;
0072
0073 close_prog:
0074     bpf_object__close(obj);
0075 }