1/*
2 * Copyright (c) 2022 Huawei Device Co., Ltd.
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 <fcntl.h>
17#include <stdlib.h>
18#include <sys/stat.h>
19#include <stdio.h>
20#include <string.h>
21#include <termios.h>
22#include <time.h>
23#include "test.h"
24
25/**
26 * @tc.name      : tcdrain_0100
27 * @tc.desc      : Wait until output has been transmitted
28 * @tc.level     : Level 0
29 */
30void tcdrain_0100(void)
31{
32    char Master[] = "/dev/ptmx";
33    char text[] = "text to be written to tty";
34    char data[80];
35    int fd_master, fd_slave, result;
36    time_t T;
37
38    fd_master = open(Master, O_RDWR | O_NONBLOCK);
39    if (fd_master < 0) {
40        t_error("%s open master failed", __func__);
41    }
42
43    result = grantpt(fd_master);
44    if (result < 0) {
45        t_error("%s grantpt failed", __func__);
46        return;
47    }
48
49    result = unlockpt(fd_master);
50    if (result < 0) {
51        t_error("%s unlockpt failed", __func__);
52        return;
53    }
54
55    char *Slave = ptsname(fd_master);
56    fd_slave = open(Slave, O_RDWR | O_NONBLOCK);
57    if (fd_slave < 0) {
58        t_error("%s open slave failed", __func__);
59    }
60
61    if (fork() == 0) {
62        if (write(fd_slave, text, strlen(text) + 1) == -1) {
63            t_error("%s write failed", __func__);
64        }
65        time(&T);
66        printf("child has written to tty, tcdrain() started at %s", ctime(&T));
67
68        if (tcdrain(fd_slave) != 0) {
69            t_error("%s tcdrain failed", __func__);
70        }
71
72        time(&T);
73        printf("tcdrain() returned at %s", ctime(&T));
74        exit(0);
75    }
76
77    time(&T);
78    printf("parent is starting nap at %s", ctime(&T));
79    sleep(2);
80    time(&T);
81    printf("parent is done with nap at %s", ctime(&T));
82    if (read(fd_master, data, sizeof(data)) == -1) {
83        t_error("%s read failed", __func__);
84    } else {
85        printf("read '%s' from the tty\n", data);
86    }
87    sleep(2);
88    close(fd_slave);
89    close(fd_master);
90}
91
92int main(int argc, char *argv[])
93{
94    tcdrain_0100();
95
96    return t_status;
97}