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

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <test_progs.h>
   3
   4 void test_task_fd_query_rawtp(void)
   5 {
   6         const char *file = "./test_get_stack_rawtp.o";
   7         __u64 probe_offset, probe_addr;
   8         __u32 len, prog_id, fd_type;
   9         struct bpf_object *obj;
  10         int efd, err, prog_fd;
  11         __u32 duration = 0;
  12         char buf[256];
  13
  14         err = bpf_prog_load(file, BPF_PROG_TYPE_RAW_TRACEPOINT, &obj, &prog_fd);
  15         if (CHECK(err, "prog_load raw tp", "err %d errno %d\n", err, errno))
  16                 return;
  17
  18         efd = bpf_raw_tracepoint_open("sys_enter", prog_fd);
  19         if (CHECK(efd < 0, "raw_tp_open", "err %d errno %d\n", efd, errno))
  20                 goto close_prog;
  21
  22         /* query (getpid(), efd) */
  23         len = sizeof(buf);
  24         err = bpf_task_fd_query(getpid(), efd, 0, buf, &len, &prog_id,
  25                                 &fd_type, &probe_offset, &probe_addr);
  26         if (CHECK(err < 0, "bpf_task_fd_query", "err %d errno %d\n", err,
  27                   errno))
  28                 goto close_prog;
  29
  30         err = fd_type == BPF_FD_TYPE_RAW_TRACEPOINT &&
  31               strcmp(buf, "sys_enter") == 0;
  32         if (CHECK(!err, "check_results", "fd_type %d tp_name %s\n",
  33                   fd_type, buf))
  34                 goto close_prog;
  35
  36         /* test zero len */
  37         len = 0;
  38         err = bpf_task_fd_query(getpid(), efd, 0, buf, &len, &prog_id,
  39                                 &fd_type, &probe_offset, &probe_addr);
  40         if (CHECK(err < 0, "bpf_task_fd_query (len = 0)", "err %d errno %d\n",
  41                   err, errno))
  42                 goto close_prog;
  43         err = fd_type == BPF_FD_TYPE_RAW_TRACEPOINT &&
  44               len == strlen("sys_enter");
  45         if (CHECK(!err, "check_results", "fd_type %d len %u\n", fd_type, len))
  46                 goto close_prog;
  47
  48         /* test empty buffer */
  49         len = sizeof(buf);
  50         err = bpf_task_fd_query(getpid(), efd, 0, 0, &len, &prog_id,
  51                                 &fd_type, &probe_offset, &probe_addr);
  52         if (CHECK(err < 0, "bpf_task_fd_query (buf = 0)", "err %d errno %d\n",
  53                   err, errno))
  54                 goto close_prog;
  55         err = fd_type == BPF_FD_TYPE_RAW_TRACEPOINT &&
  56               len == strlen("sys_enter");
  57         if (CHECK(!err, "check_results", "fd_type %d len %u\n", fd_type, len))
  58                 goto close_prog;
  59
  60         /* test smaller buffer */
  61         len = 3;
  62         err = bpf_task_fd_query(getpid(), efd, 0, buf, &len, &prog_id,
  63                                 &fd_type, &probe_offset, &probe_addr);
  64         if (CHECK(err >= 0 || errno != ENOSPC, "bpf_task_fd_query (len = 3)",
  65                   "err %d errno %d\n", err, errno))
  66                 goto close_prog;
  67         err = fd_type == BPF_FD_TYPE_RAW_TRACEPOINT &&
  68               len == strlen("sys_enter") &&
  69               strcmp(buf, "sy") == 0;
  70         if (CHECK(!err, "check_results", "fd_type %d len %u\n", fd_type, len))
  71                 goto close_prog;
  72
  73         goto close_prog_noerr;
  74 close_prog:
  75         error_cnt++;
  76 close_prog_noerr:
  77         bpf_object__close(obj);
  78 }