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Annotation of prex/usr/test/pipe/pipe.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:  * pipe.c - test unix pipe
                     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:
                     45: static void
                     46: test1(void)
                     47: {
                     48:        int fd[2];
                     49:        char str[] = "test1";
                     50:        char buf[256];
                     51:
                     52:        printf("pipe test program\n");
                     53:
                     54:        if (pipe(fd) == -1) {
                     55:                perror("pipe");
                     56:                exit(1);
                     57:        }
                     58:        write(fd[1], str, sizeof(str));
                     59:        read(fd[0], buf, sizeof(buf));
                     60:        printf("str=%s\n", buf);
                     61: }
                     62:
                     63: static void
                     64: test2(void)
                     65: {
                     66:        int fd[2];
                     67:        char str[] = "test2: hello!";
                     68:        char buf[256];
                     69:
                     70:        printf("pipe test program\n");
                     71:
                     72:        if (pipe(fd) == -1) {
                     73:                perror("pipe");
                     74:                exit(1);
                     75:        }
                     76:        switch(vfork()) {
                     77:        case -1:
                     78:                perror("fork");
                     79:                break;
                     80:
                     81:        case 0: /* child */
                     82:                close(fd[1]);
                     83:                read(fd[0], buf, 256);
                     84:                close(fd[0]);
                     85:                printf("str=%s\n", buf);
                     86:                exit(0);
                     87:                break;
                     88:
                     89:        default: /* parent */
                     90:                close(fd[0]);
                     91:                write(fd[1], str, sizeof(str));
                     92:                close(fd[1]);
                     93:                exit(0);
                     94:                break;
                     95:        }
                     96: }
                     97:
                     98: int
                     99: main(int argc, char *argv[])
                    100: {
                    101:        test2();
                    102:        return 0;
                    103: }