Annotation of prex/usr/test/fifo/fifo.c, Revision 1.1.1.1
1.1 nbrk 1: /*
2: * Copyright (c) 2008, Kohsuke Ohtani
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. Neither the name of the author nor the names of any co-contributors
14: * may be used to endorse or promote products derived from this software
15: * without specific prior written permission.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27: * SUCH DAMAGE.
28: */
29:
30: /*
31: * fifo.c - test FIFO function
32: */
33:
34: #include <prex/prex.h>
35: #include <sys/fcntl.h>
36: #include <sys/stat.h>
37: #include <sys/errno.h>
38:
39: #include <stdio.h>
40: #include <stdlib.h>
41: #include <string.h>
42: #include <unistd.h>
43:
44: int
45: main(int argc, char *argv[])
46: {
47: int pid, fd1, fd2, len;
48: char buf1[256], buf2[256];
49:
50: printf("FIFO test program\n");
51:
52: if (mknod("/fifo/test", S_IFIFO | 0666, 0) == -1) {
53: perror("mkfifo");
54: exit(1);
55: }
56: pid = vfork();
57: if (pid == -1) {
58: perror("fork");
59: exit(1);
60: }
61: if (pid == 0) {
62: /* child */
63: printf("child: task=%x\n", (int)task_self());
64:
65: fd1 = open("/fifo/test", O_RDONLY);
66: if (fd1 == -1) {
67: perror("open");
68: exit(1);
69: }
70: for (;;) {
71: printf("child: reading data from FIFO\n");
72: len = read(fd1, buf1, sizeof(buf1) - 1);
73: if (len == 0)
74: break;
75: buf1[len] = '\0';
76: printf("child: length=%d data=%s\n", len, buf1);
77: }
78: close(fd1);
79: printf("child: exit\n");
80: exit(0);
81: }
82: printf("parent: task=%x\n", (int)task_self());
83:
84: fd2 = open("/fifo/test", O_WRONLY);
85: if (fd2 == -1) {
86: perror("open");
87: exit(1);
88: }
89: for (;;) {
90: printf("parent: please input string...\n");
91: fgets(buf2, sizeof(buf2) - 1, stdin);
92: if (feof(stdin))
93: break;
94: printf("parent: writing to FIFO\n");
95: write(fd2, buf2, strlen(buf2));
96: }
97: close(fd2);
98: printf("parent: exit\n");
99: exit(0);
100: return 0;
101: }
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