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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (c) 2021 Facebook */
   3
   4 #include <test_progs.h>
   5
   6 #include "trace_vprintk.lskel.h"
   7
   8 #define SEARCHMSG       "1,2,3,4,5,6,7,8,9,10"
   9
  10 static void trace_pipe_cb(const char *str, void *data)
  11 {
  12         if (strstr(str, SEARCHMSG) != NULL)
  13                 (*(int *)data)++;
  14 }
  15
  16 void serial_test_trace_vprintk(void)
  17 {
  18         struct trace_vprintk_lskel__bss *bss;
  19         struct trace_vprintk_lskel *skel;
  20         int err = 0, found = 0;
  21
  22         skel = trace_vprintk_lskel__open_and_load();
  23         if (!ASSERT_OK_PTR(skel, "trace_vprintk__open_and_load"))
  24                 goto cleanup;
  25
  26         bss = skel->bss;
  27
  28         err = trace_vprintk_lskel__attach(skel);
  29         if (!ASSERT_OK(err, "trace_vprintk__attach"))
  30                 goto cleanup;
  31
  32         /* wait for tracepoint to trigger */
  33         usleep(1);
  34         trace_vprintk_lskel__detach(skel);
  35
  36         if (!ASSERT_GT(bss->trace_vprintk_ran, 0, "bss->trace_vprintk_ran"))
  37                 goto cleanup;
  38
  39         if (!ASSERT_GT(bss->trace_vprintk_ret, 0, "bss->trace_vprintk_ret"))
  40                 goto cleanup;
  41
  42         /* verify our search string is in the trace buffer */
  43         ASSERT_OK(read_trace_pipe_iter(trace_pipe_cb, &found, 1000),
  44                  "read_trace_pipe_iter");
  45
  46         if (!ASSERT_EQ(found, bss->trace_vprintk_ran, "found"))
  47                 goto cleanup;
  48
  49         if (!ASSERT_LT(bss->null_data_vprintk_ret, 0, "bss->null_data_vprintk_ret"))
  50                 goto cleanup;
  51
  52 cleanup:
  53         trace_vprintk_lskel__destroy(skel);
  54 }