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 TRACEBUF	"/sys/kernel/debug/tracing/trace_pipe"
 9#define SEARCHMSG	"testing,testing"
10
11void serial_test_trace_printk(void)
12{
13	struct trace_printk_lskel__bss *bss;
14	int err = 0, iter = 0, found = 0;
15	struct trace_printk_lskel *skel;
16	char *buf = NULL;
17	FILE *fp = NULL;
18	size_t buflen;
19
20	skel = trace_printk_lskel__open();
21	if (!ASSERT_OK_PTR(skel, "trace_printk__open"))
22		return;
23
24	ASSERT_EQ(skel->rodata->fmt[0], 'T', "skel->rodata->fmt[0]");
25	skel->rodata->fmt[0] = 't';
26
27	err = trace_printk_lskel__load(skel);
28	if (!ASSERT_OK(err, "trace_printk__load"))
29		goto cleanup;
30
31	bss = skel->bss;
32
33	err = trace_printk_lskel__attach(skel);
34	if (!ASSERT_OK(err, "trace_printk__attach"))
35		goto cleanup;
36
37	fp = fopen(TRACEBUF, "r");
38	if (!ASSERT_OK_PTR(fp, "fopen(TRACEBUF)"))
39		goto cleanup;
40
41	/* We do not want to wait forever if this test fails... */
42	fcntl(fileno(fp), F_SETFL, O_NONBLOCK);
43
44	/* wait for tracepoint to trigger */
45	usleep(1);
46	trace_printk_lskel__detach(skel);
47
48	if (!ASSERT_GT(bss->trace_printk_ran, 0, "bss->trace_printk_ran"))
49		goto cleanup;
50
51	if (!ASSERT_GT(bss->trace_printk_ret, 0, "bss->trace_printk_ret"))
52		goto cleanup;
53
54	/* verify our search string is in the trace buffer */
55	while (getline(&buf, &buflen, fp) >= 0 || errno == EAGAIN) {
56		if (strstr(buf, SEARCHMSG) != NULL)
57			found++;
58		if (found == bss->trace_printk_ran)
59			break;
60		if (++iter > 1000)
61			break;
62	}
63
64	if (!ASSERT_EQ(found, bss->trace_printk_ran, "found"))
65		goto cleanup;
66
67cleanup:
68	trace_printk_lskel__destroy(skel);
69	free(buf);
70	if (fp)
71		fclose(fp);
72}