// SPDX-License-Identifier: GPL-2.0
|
/* Copyright (c) 2020, Oracle and/or its affiliates. */
|
|
#include <test_progs.h>
|
|
#include "trace_printk.skel.h"
|
|
#define TRACEBUF "/sys/kernel/debug/tracing/trace_pipe"
|
#define SEARCHMSG "testing,testing"
|
|
void test_trace_printk(void)
|
{
|
int err, iter = 0, duration = 0, found = 0;
|
struct trace_printk__bss *bss;
|
struct trace_printk *skel;
|
char *buf = NULL;
|
FILE *fp = NULL;
|
size_t buflen;
|
|
skel = trace_printk__open();
|
if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
|
return;
|
|
err = trace_printk__load(skel);
|
if (CHECK(err, "skel_load", "failed to load skeleton: %d\n", err))
|
goto cleanup;
|
|
bss = skel->bss;
|
|
err = trace_printk__attach(skel);
|
if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
|
goto cleanup;
|
|
fp = fopen(TRACEBUF, "r");
|
if (CHECK(fp == NULL, "could not open trace buffer",
|
"error %d opening %s", errno, TRACEBUF))
|
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__detach(skel);
|
|
if (CHECK(bss->trace_printk_ran == 0,
|
"bpf_trace_printk never ran",
|
"ran == %d", bss->trace_printk_ran))
|
goto cleanup;
|
|
if (CHECK(bss->trace_printk_ret <= 0,
|
"bpf_trace_printk returned <= 0 value",
|
"got %d", 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 (CHECK(!found, "message from bpf_trace_printk not found",
|
"no instance of %s in %s", SEARCHMSG, TRACEBUF))
|
goto cleanup;
|
|
cleanup:
|
trace_printk__destroy(skel);
|
free(buf);
|
if (fp)
|
fclose(fp);
|
}
|
