1 /*
2 * Copyright (c) Huawei Technologies Co., Ltd. 2020-2023. All rights reserved.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include <sys/ioctl.h>
17 #include <cstdio>
18 #include <sys/types.h>
19 #include <sys/stat.h>
20 #include <fcntl.h>
21 #include <unistd.h>
22 #include <termios.h>
23 #include "util.h"
24
25 #define DEVICE_FILE "/dev/tty"
26
27 // Used to perform control operations on device files
28 // set baud rate
Bm_function_Ioctl_baudrate(benchmark::State & state)29 static void Bm_function_Ioctl_baudrate(benchmark::State &state)
30 {
31 struct termios ttydev;
32 int ret;
33 int fd = open(DEVICE_FILE, O_RDWR, OPEN_MODE);
34 if (fd == -1) {
35 perror("open ioctl");
36 }
37 ret = tcgetattr(fd, &ttydev);
38 if (ret == -1) {
39 perror("Property fetch failed");
40 }
41 int speed = cfgetospeed(&ttydev);
42 cfsetospeed(&ttydev, B19200);
43 cfsetispeed(&ttydev, B19200);
44 for (auto _ : state) {
45 ret = ioctl(fd, TCSETS, &ttydev);
46 if (ret < 0) {
47 perror("ioctl");
48 }
49 benchmark::DoNotOptimize(ret);
50 }
51 cfsetospeed(&ttydev, speed);
52 cfsetispeed(&ttydev, speed);
53 ret = ioctl(fd, TCSETS, &ttydev);
54 if (ret == -1) {
55 perror("Failed to restore baud rate");
56 }
57 close(fd);
58 }
59
60 MUSL_BENCHMARK(Bm_function_Ioctl_baudrate);
61