source: trunk/minix/test/select/test03.c@ 22

Last change on this file since 22 was 9, checked in by Mattia Monga, 14 years ago

Minix 3.1.2a
File size: 3.4 KB
Line 
1/*
2 * Test name: test02.c
3 *
4 * Objetive: The purpose of this test is to make sure that select works
5 * when working with files.
6 *
7 * Description: This test shows more cases than in test02.c, where every
8 * descriptor is ready. Here in one select call only half of the fd's will
9 * be ready and in the next one none of them will be ready.
10 *
11 * Jose M. Gomez
12 */
13
14#include <sys/types.h>
15#include <fcntl.h>
16#include <unistd.h>
17#include <sys/select.h>
18#include <stdio.h>
19#include <stdlib.h>
20#include <limits.h>
21#include <sys/time.h>
22
23void dump_fdset(fd_set *set) {
24 int i;
25 for (i = 0; i < OPEN_MAX; i++)
26 if (FD_ISSET(i, set))
27 printf(" %d ", i);
28 printf("\n");
29}
30
31void main(void) {
32 int fd1, fd2, fd3, fd4, fd5, fd6; /* file descriptors of files */
33 fd_set fds_read, fds_write; /* bit maps */
34 struct timeval timeout; /* timeout */
35 int retval; /* ret value */
36
37 /* Creates the dummy files with different modes */
38 fd1 = open("dummy1.txt", O_CREAT | O_RDONLY);
39 if (fd1 < 0) {
40 perror("Error opening file");
41 exit(-1);
42 }
43
44 fd2 = open("dummy2.txt", O_CREAT | O_RDONLY);
45 if (fd2 < 0) {
46 perror("Error opening file");
47 exit(-1);
48 }
49
50 fd3 = open("dummy3.txt", O_CREAT | O_WRONLY);
51 if (fd3 < 0) {
52 perror("Error opening file");
53 exit(-1);
54 }
55
56 fd4 = open("dummy4.txt", O_CREAT | O_WRONLY);
57 if (fd4 < 0) {
58 perror("Error opening file");
59 exit(-1);
60 }
61
62 fd5 = open("dummy5.txt", O_CREAT | O_RDWR);
63 if (fd5 < 0) {
64 perror("Error opening file");
65 exit(-1);
66 }
67
68 fd6 = open("dummy6.txt", O_CREAT | O_RDWR);
69 if (fd6 < 0) {
70 perror("Error opening file");
71 exit(-1);
72 }
73
74 /* Create the fd_set structures */
75 FD_ZERO(&fds_read);
76 FD_ZERO(&fds_write);
77 FD_SET(fd1, &fds_write); /* fd1 => O_RDONLY */
78 FD_SET(fd2, &fds_write); /* fd2 => O_RDONLY */
79 FD_SET(fd3, &fds_read); /* fd3 => O_WRONLY */
80 FD_SET(fd4, &fds_read); /* fd4 => O_WRONLY */
81 FD_SET(fd5, &fds_read); /* fd5 => O_RDWR */
82 FD_SET(fd5, &fds_write); /* fd5 => O_RDWR */
83 FD_SET(fd6, &fds_read); /* fd6 => O_RDWR */
84 FD_SET(fd6, &fds_write); /* fd6 => O_RDWR */
85
86 printf("* Dump INPUT fds_read:\n");
87 dump_fdset(&fds_read);
88 printf("* Dump INPUT fds_write:\n");
89 dump_fdset(&fds_write);
90
91 retval=select(9, &fds_read, &fds_write, NULL, NULL);
92 printf("\n***********************\n");
93 printf("After select: \n");
94 printf("Return value: %d\n", retval);
95 printf("* Dump RESULTING fds_read:\n");
96 dump_fdset(&fds_read);
97 printf("* Dump RESULTING fds_write:\n");
98 dump_fdset(&fds_write);
99
100 /* make a select call where none of them are ready (don't use fd5 and fd6) */
101
102 FD_ZERO(&fds_read);
103 FD_ZERO(&fds_write);
104 FD_SET(fd1, &fds_write); /* fd1 => O_RDONLY */
105 FD_SET(fd2, &fds_write); /* fd2 => O_RDONLY */
106 FD_SET(fd3, &fds_read); /* fd3 => O_WRONLY */
107 FD_SET(fd4, &fds_read); /* fd4 => O_WRONLY */
108
109 /* make a select call where none of them are ready (don't use fd5 and fd6) */
110 /* create a timeout as well */
111 timeout.tv_sec = 5;
112 timeout.tv_usec = 0;
113 retval=select(7, &fds_read, &fds_write, NULL, NULL);
114 printf("\n***********************\n");
115 printf("After select: \n");
116 printf("Return value: %d\n", retval);
117 printf("* Dump RESULTING fds_read:\n");
118 dump_fdset(&fds_read);
119 printf("* Dump RESULTING fds_write:\n");
120 dump_fdset(&fds_write);
121
122 /* close and delete dummy files */
123 close(fd1);
124 close(fd2);
125 close(fd3);
126 close(fd4);
127 close(fd5);
128 close(fd6);
129 unlink("dummy1.txt");
130 unlink("dummy2.txt");
131 unlink("dummy3.txt");
132 unlink("dummy4.txt");
133 unlink("dummy5.txt");
134 unlink("dummy6.txt");
135}
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