scoutos / prex-0.9.0 / usr / test / fifo / fifo.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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2 | * Copyright (c) 2008, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | /*
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31 | * fifo.c - test FIFO function
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32 | */
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33 | |||
34 | #include <sys/prex.h> |
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35 | #include <sys/fcntl.h> |
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36 | #include <sys/stat.h> |
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37 | #include <sys/errno.h> |
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38 | |||
39 | #include <stdio.h> |
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40 | #include <stdlib.h> |
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41 | #include <string.h> |
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42 | #include <unistd.h> |
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43 | |||
44 | int
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45 | main(int argc, char *argv[]) |
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46 | { |
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47 | int pid, fd1, fd2, len;
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48 | char buf1[256], buf2[256]; |
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49 | |||
50 | printf("FIFO test program\n");
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51 | |||
52 | if (mknod("/mnt/fifo/test", (mode_t)(S_IFIFO | 0666), 0) == -1) { |
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53 | perror("mkfifo");
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54 | exit(1);
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55 | } |
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56 | pid = vfork(); |
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57 | if (pid == -1) { |
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58 | perror("fork");
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59 | exit(1);
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60 | } |
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61 | if (pid == 0) { |
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62 | /* child */
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63 | printf("child: task=%x\n", (int)task_self()); |
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64 | |||
65 | fd1 = open("/mnt/fifo/test", O_RDONLY);
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66 | if (fd1 == -1) { |
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67 | perror("open");
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68 | exit(1);
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69 | } |
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70 | for (;;) {
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71 | printf("child: reading data from FIFO\n");
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72 | len = read(fd1, buf1, sizeof(buf1) - 1); |
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73 | if (len == 0) |
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74 | break;
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75 | buf1[len] = '\0';
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76 | printf("child: length=%d data=%s\n", len, buf1);
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77 | } |
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78 | close(fd1); |
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79 | printf("child: exit\n");
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80 | exit(0);
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81 | } |
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82 | printf("parent: task=%x\n", (int)task_self()); |
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83 | |||
84 | fd2 = open("/mnt/fifo/test", O_WRONLY);
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85 | if (fd2 == -1) { |
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86 | perror("open");
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87 | exit(1);
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88 | } |
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89 | for (;;) {
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90 | printf("parent: please input string...\n");
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91 | fgets(buf2, sizeof(buf2) - 1, stdin); |
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92 | if (feof(stdin))
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93 | break;
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94 | printf("parent: writing to FIFO\n");
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95 | write(fd2, buf2, strlen(buf2)); |
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96 | } |
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97 | close(fd2); |
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98 | printf("parent: exit\n");
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99 | exit(0);
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100 | return 0; |
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101 | } |