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 */
tcdrain_0100(void)30 void 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
main(int argc,char * argv[])92 int main(int argc, char *argv[])
93 {
94 tcdrain_0100();
95
96 return t_status;
97 }