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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020, Oracle and/or its affiliates. */
#include <test_progs.h>
#include "trace_printk.lskel.h"
#define TRACEFS_PIPE "/sys/kernel/tracing/trace_pipe"
#define DEBUGFS_PIPE "/sys/kernel/debug/tracing/trace_pipe"
#define SEARCHMSG "testing,testing"
void serial_test_trace_printk(void)
{
struct trace_printk_lskel__bss *bss;
int err = 0, iter = 0, found = 0;
struct trace_printk_lskel *skel;
char *buf = NULL;
FILE *fp = NULL;
size_t buflen;
skel = trace_printk_lskel__open();
if (!ASSERT_OK_PTR(skel, "trace_printk__open"))
return;
ASSERT_EQ(skel->rodata->fmt[0], 'T', "skel->rodata->fmt[0]");
skel->rodata->fmt[0] = 't';
err = trace_printk_lskel__load(skel);
if (!ASSERT_OK(err, "trace_printk__load"))
goto cleanup;
bss = skel->bss;
err = trace_printk_lskel__attach(skel);
if (!ASSERT_OK(err, "trace_printk__attach"))
goto cleanup;
if (access(TRACEFS_PIPE, F_OK) == 0)
fp = fopen(TRACEFS_PIPE, "r");
else
fp = fopen(DEBUGFS_PIPE, "r");
if (!ASSERT_OK_PTR(fp, "fopen(TRACE_PIPE)"))
goto cleanup;
/* We do not want to wait forever if this test fails... */
fcntl(fileno(fp), F_SETFL, O_NONBLOCK);
/* wait for tracepoint to trigger */
usleep(1);
trace_printk_lskel__detach(skel);
if (!ASSERT_GT(bss->trace_printk_ran, 0, "bss->trace_printk_ran"))
goto cleanup;
if (!ASSERT_GT(bss->trace_printk_ret, 0, "bss->trace_printk_ret"))
goto cleanup;
/* verify our search string is in the trace buffer */
while (getline(&buf, &buflen, fp) >= 0 || errno == EAGAIN) {
if (strstr(buf, SEARCHMSG) != NULL)
found++;
if (found == bss->trace_printk_ran)
break;
if (++iter > 1000)
break;
}
if (!ASSERT_EQ(found, bss->trace_printk_ran, "found"))
goto cleanup;
cleanup:
trace_printk_lskel__destroy(skel);
free(buf);
if (fp)
fclose(fp);
}
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