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

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <test_progs.h>
   3 #include "test_stack_var_off.skel.h"
   4
   5 /* Test read and writes to the stack performed with offsets that are not
   6  * statically known.
   7  */
   8 void test_stack_var_off(void)
   9 {
  10         int duration = 0;
  11         struct test_stack_var_off *skel;
  12
  13         skel = test_stack_var_off__open_and_load();
  14         if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
  15                 return;
  16
  17         /* Give pid to bpf prog so it doesn't trigger for anyone else. */
  18         skel->bss->test_pid = getpid();
  19         /* Initialize the probe's input. */
  20         skel->bss->input[0] = 2;
  21         skel->bss->input[1] = 42;  /* This will be returned in probe_res. */
  22
  23         if (!ASSERT_OK(test_stack_var_off__attach(skel), "skel_attach"))
  24                 goto cleanup;
  25
  26         /* Trigger probe. */
  27         usleep(1);
  28
  29         if (CHECK(skel->bss->probe_res != 42, "check_probe_res",
  30                   "wrong probe res: %d\n", skel->bss->probe_res))
  31                 goto cleanup;
  32
  33 cleanup:
  34         test_stack_var_off__destroy(skel);
  35 }