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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: }