LXR linux/tools/testing/selftests/bpf/prog_tests/task_fd_query

   1// SPDX-License-Identifier: GPL-2.0
   2#include <test_progs.h>
   3
   4void 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
  73close_prog:
  74        bpf_object__close(obj);
  75}
  76