1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2020, Oracle and/or its affiliates. */
3
4 #include <test_progs.h>
5
6 #include "trace_printk.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 "testing,testing"
11
serial_test_trace_printk(void)12 void serial_test_trace_printk(void)
13 {
14 struct trace_printk_lskel__bss *bss;
15 int err = 0, iter = 0, found = 0;
16 struct trace_printk_lskel *skel;
17 char *buf = NULL;
18 FILE *fp = NULL;
19 size_t buflen;
20
21 skel = trace_printk_lskel__open();
22 if (!ASSERT_OK_PTR(skel, "trace_printk__open"))
23 return;
24
25 ASSERT_EQ(skel->rodata->fmt[0], 'T', "skel->rodata->fmt[0]");
26 skel->rodata->fmt[0] = 't';
27
28 err = trace_printk_lskel__load(skel);
29 if (!ASSERT_OK(err, "trace_printk__load"))
30 goto cleanup;
31
32 bss = skel->bss;
33
34 err = trace_printk_lskel__attach(skel);
35 if (!ASSERT_OK(err, "trace_printk__attach"))
36 goto cleanup;
37
38 if (access(TRACEFS_PIPE, F_OK) == 0)
39 fp = fopen(TRACEFS_PIPE, "r");
40 else
41 fp = fopen(DEBUGFS_PIPE, "r");
42 if (!ASSERT_OK_PTR(fp, "fopen(TRACE_PIPE)"))
43 goto cleanup;
44
45 /* We do not want to wait forever if this test fails... */
46 fcntl(fileno(fp), F_SETFL, O_NONBLOCK);
47
48 /* wait for tracepoint to trigger */
49 usleep(1);
50 trace_printk_lskel__detach(skel);
51
52 if (!ASSERT_GT(bss->trace_printk_ran, 0, "bss->trace_printk_ran"))
53 goto cleanup;
54
55 if (!ASSERT_GT(bss->trace_printk_ret, 0, "bss->trace_printk_ret"))
56 goto cleanup;
57
58 /* verify our search string is in the trace buffer */
59 while (getline(&buf, &buflen, fp) >= 0 || errno == EAGAIN) {
60 if (strstr(buf, SEARCHMSG) != NULL)
61 found++;
62 if (found == bss->trace_printk_ran)
63 break;
64 if (++iter > 1000)
65 break;
66 }
67
68 if (!ASSERT_EQ(found, bss->trace_printk_ran, "found"))
69 goto cleanup;
70
71 cleanup:
72 trace_printk_lskel__destroy(skel);
73 free(buf);
74 if (fp)
75 fclose(fp);
76 }
77