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 TRACEFS_PIPE "/sys/kernel/tracing/trace_pipe"
9 #define DEBUGFS_PIPE "/sys/kernel/debug/tracing/trace_pipe"
10 #define SEARCHMSG "1,2,3,4,5,6,7,8,9,10"
11
serial_test_trace_vprintk(void)12 void serial_test_trace_vprintk(void)
13 {
14 struct trace_vprintk_lskel__bss *bss;
15 int err = 0, iter = 0, found = 0;
16 struct trace_vprintk_lskel *skel;
17 char *buf = NULL;
18 FILE *fp = NULL;
19 size_t buflen;
20
21 skel = trace_vprintk_lskel__open_and_load();
22 if (!ASSERT_OK_PTR(skel, "trace_vprintk__open_and_load"))
23 goto cleanup;
24
25 bss = skel->bss;
26
27 err = trace_vprintk_lskel__attach(skel);
28 if (!ASSERT_OK(err, "trace_vprintk__attach"))
29 goto cleanup;
30
31 if (access(TRACEFS_PIPE, F_OK) == 0)
32 fp = fopen(TRACEFS_PIPE, "r");
33 else
34 fp = fopen(DEBUGFS_PIPE, "r");
35 if (!ASSERT_OK_PTR(fp, "fopen(TRACE_PIPE)"))
36 goto cleanup;
37
38 /* We do not want to wait forever if this test fails... */
39 fcntl(fileno(fp), F_SETFL, O_NONBLOCK);
40
41 /* wait for tracepoint to trigger */
42 usleep(1);
43 trace_vprintk_lskel__detach(skel);
44
45 if (!ASSERT_GT(bss->trace_vprintk_ran, 0, "bss->trace_vprintk_ran"))
46 goto cleanup;
47
48 if (!ASSERT_GT(bss->trace_vprintk_ret, 0, "bss->trace_vprintk_ret"))
49 goto cleanup;
50
51 /* verify our search string is in the trace buffer */
52 while (getline(&buf, &buflen, fp) >= 0 || errno == EAGAIN) {
53 if (strstr(buf, SEARCHMSG) != NULL)
54 found++;
55 if (found == bss->trace_vprintk_ran)
56 break;
57 if (++iter > 1000)
58 break;
59 }
60
61 if (!ASSERT_EQ(found, bss->trace_vprintk_ran, "found"))
62 goto cleanup;
63
64 if (!ASSERT_LT(bss->null_data_vprintk_ret, 0, "bss->null_data_vprintk_ret"))
65 goto cleanup;
66
67 cleanup:
68 trace_vprintk_lskel__destroy(skel);
69 free(buf);
70 if (fp)
71 fclose(fp);
72 }
73