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 
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