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
12void 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
67cleanup:
68	trace_vprintk_lskel__destroy(skel);
69	free(buf);
70	if (fp)
71		fclose(fp);
72}
73