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 TRACEBUF "/sys/kernel/debug/tracing/trace_pipe"
9 #define SEARCHMSG "1,2,3,4,5,6,7,8,9,10"
10
serial_test_trace_vprintk(void)11 void serial_test_trace_vprintk(void)
12 {
13 struct trace_vprintk_lskel__bss *bss;
14 int err = 0, iter = 0, found = 0;
15 struct trace_vprintk_lskel *skel;
16 char *buf = NULL;
17 FILE *fp = NULL;
18 size_t buflen;
19
20 skel = trace_vprintk_lskel__open_and_load();
21 if (!ASSERT_OK_PTR(skel, "trace_vprintk__open_and_load"))
22 goto cleanup;
23
24 bss = skel->bss;
25
26 err = trace_vprintk_lskel__attach(skel);
27 if (!ASSERT_OK(err, "trace_vprintk__attach"))
28 goto cleanup;
29
30 fp = fopen(TRACEBUF, "r");
31 if (!ASSERT_OK_PTR(fp, "fopen(TRACEBUF)"))
32 goto cleanup;
33
34 /* We do not want to wait forever if this test fails... */
35 fcntl(fileno(fp), F_SETFL, O_NONBLOCK);
36
37 /* wait for tracepoint to trigger */
38 usleep(1);
39 trace_vprintk_lskel__detach(skel);
40
41 if (!ASSERT_GT(bss->trace_vprintk_ran, 0, "bss->trace_vprintk_ran"))
42 goto cleanup;
43
44 if (!ASSERT_GT(bss->trace_vprintk_ret, 0, "bss->trace_vprintk_ret"))
45 goto cleanup;
46
47 /* verify our search string is in the trace buffer */
48 while (getline(&buf, &buflen, fp) >= 0 || errno == EAGAIN) {
49 if (strstr(buf, SEARCHMSG) != NULL)
50 found++;
51 if (found == bss->trace_vprintk_ran)
52 break;
53 if (++iter > 1000)
54 break;
55 }
56
57 if (!ASSERT_EQ(found, bss->trace_vprintk_ran, "found"))
58 goto cleanup;
59
60 if (!ASSERT_LT(bss->null_data_vprintk_ret, 0, "bss->null_data_vprintk_ret"))
61 goto cleanup;
62
63 cleanup:
64 trace_vprintk_lskel__destroy(skel);
65 free(buf);
66 if (fp)
67 fclose(fp);
68 }
69