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Annotation of prex/usr/test/fifo/fifo.c, Revision 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: }