test/syslink/test1.c

   1 /*
   2  * Copyright (c) 2007 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/test/syslink/test1.c,v 1.1 2007/05/28 05:28:12 dillon Exp $
  35  */
  36 #include <sys/types.h>
  37 #include <sys/syslink.h>
  38 #include <sys/syslink_msg.h>
  39 #include <errno.h>
  40 #include <string.h>
  41
  42 static void reader(int fd);
  43 static void writer(int fd);
  44
  45 int
  46 main(int ac, char **av)
  47 {
  48         union syslink_info_all info;
  49         int fd1;
  50         int fd2;
  51
  52         bzero(&info, sizeof(info));
  53         if (syslink(SYSLINK_CMD_NEW, &info.head, sizeof(info)) < 0) {
  54                 perror("syslink");
  55                 exit(1);
  56         }
  57         printf("fds %d %d\n", info.cmd_new.fds[0], info.cmd_new.fds[1]);
  58         if (fork() == 0) {
  59                 reader(info.cmd_new.fds[0]);
  60         } else {
  61                 writer(info.cmd_new.fds[1]);
  62         }
  63         while (wait(NULL) > 0)
  64                 ;
  65         return(0);
  66 }
  67
  68 static
  69 void
  70 writer(int fd)
  71 {
  72         union syslink_small_msg cmd;
  73         union syslink_small_msg rep;
  74         int n;
  75         int wcount = 10;
  76
  77         bzero(&cmd, sizeof(cmd));
  78         cmd.msg.sm_bytes = sizeof(struct syslink_msg);
  79         cmd.msg.sm_proto = SMPROTO_BSDVFS;
  80         cmd.msg.sm_head.se_cmd = 0;
  81         cmd.msg.sm_head.se_bytes = sizeof(cmd.msg.sm_head);
  82         for (;;) {
  83                 ++cmd.msg.sm_msgid;
  84                 n = write(fd, &cmd, cmd.msg.sm_bytes);
  85                 if (n < 0) {
  86                         printf("write error %s\n", strerror(errno));
  87                 } else if (wcount) {
  88                         printf("write n = %d %lld\n", n, cmd.msg.sm_msgid);
  89                         --wcount;
  90                 } else {
  91                         printf("write n = %d %lld\n", n, cmd.msg.sm_msgid);
  92                         n = read(fd, &rep, sizeof(rep));
  93                         printf("read-reply %d %lld\n", n, rep.msg.sm_msgid);
  94                 }
  95         }
  96 }
  97
  98 static
  99 void
 100 reader(int fd)
 101 {
 102         union syslink_small_msg cmd;
 103         union syslink_small_msg rep;
 104         int n;
 105
 106         bzero(&rep, sizeof(rep));
 107         rep.msg.sm_bytes = sizeof(struct syslink_msg);
 108         rep.msg.sm_proto = SMPROTO_BSDVFS | SM_PROTO_REPLY;
 109         rep.msg.sm_msgid = 1;
 110         rep.msg.sm_head.se_cmd = 0;
 111         rep.msg.sm_head.se_bytes = sizeof(rep.msg.sm_head);
 112
 113         for (;;) {
 114                 n = read(fd, &cmd, sizeof(cmd));
 115                 if (n < 0 && errno == ENOSPC) {
 116                         printf("no space\n");
 117                         exit(1);
 118                 }
 119                 if (n < 0) {
 120                         printf("read error %s\n", strerror(errno));
 121                 } else {
 122                         printf("read n = %d\n", n);
 123                         rep.msg.sm_msgid = cmd.msg.sm_msgid;
 124                         n = write(fd, &rep, rep.msg.sm_bytes);
 125                         if (n < 0) {
 126                                 printf("reply error %s\n", strerror(errno));
 127                         } else {
 128                                 printf("reply ok\n");
 129                         }
 130                 }
 131                 if (n < 0)
 132                         break;
 133                 /*sleep(1);*/
 134         }
 135 }
 136