source: trunk/minix/test/select/test09.c@ 10

Last change on this file since 10 was 9, checked in by Mattia Monga, 13 years ago

Minix 3.1.2a

File size: 1.4 KB
Line 
1/*
2 * Test name: test09.c
3 *
4 * Objetive: The purpose of this test is to make sure that select works
5 * when working with the terminal.
6 *
7 * Description: This tests wait entry from stdin using select and displays
8 * it again in stdout when it is ready to write (which is always)
9 *
10 * Jose M. Gomez
11 */
12
13#include <sys/types.h>
14#include <fcntl.h>
15#include <unistd.h>
16#include <sys/select.h>
17#include <stdio.h>
18#include <stdlib.h>
19#include <string.h>
20#include <limits.h>
21
22void main(void) {
23 fd_set fds_read, fds_write;
24 int retval;
25 char data[1024];
26
27 FD_ZERO(&fds_read);
28 FD_ZERO(&fds_write);
29 FD_SET(0, &fds_read); /* stdin */
30 FD_SET(1, &fds_write); /* stdout */
31
32 while(1) {
33 printf("Input some data: ");
34 fflush(stdout);
35 retval=select(3, &fds_read, NULL, NULL, NULL);
36 if (retval < 0) {
37 fprintf(stderr, "Error while executing select\n");
38 exit(-1);
39 }
40 printf("select retval: %d\n", retval);
41 if (!FD_ISSET(0, &fds_read)) {
42 fprintf(stderr, "Error: stdin not ready (?)\n");
43 exit(-1);
44 }
45 printf("gets..\n");
46 gets(data);
47 printf("gets done..\n");
48 if (!strcmp(data, "exit"))
49 exit(0);
50 printf("Try to write it back\n");
51 retval=select(3, NULL, &fds_write, NULL, NULL);
52 if (retval < 0) {
53 fprintf(stderr, "Error while executing select\n");
54 exit(-1);
55 }
56 if (!FD_ISSET(1, &fds_write)) {
57 fprintf(stderr, "Error: stdout not ready (?)\n");
58 exit(-1);
59 }
60 printf("Data: %s\n", data);
61 }
62}
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