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test2.c
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test2.c
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/*
* Copyright (c) 2007 The DragonFly Project. All rights reserved.
*
* This code is derived from software contributed to The DragonFly Project
* by Matthew Dillon <dillon@backplane.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name of The DragonFly Project nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific, prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $DragonFly: src/test/syslink/test2.c,v 1.1 2007/06/29 17:18:42 dillon Exp $
*/
#include <sys/types.h>
#include <sys/syslink.h>
#include <sys/syslink_msg.h>
#include <sys/mman.h>
#include <sys/uio.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
static void reader(int fd);
static void writer(int fd);
#define BUFSIZE 65536
int
main(int ac, char **av)
{
union syslink_info_all info;
int fd1;
int fd2;
bzero(&info, sizeof(info));
if (syslink(SYSLINK_CMD_NEW, &info.head, sizeof(info)) < 0) {
perror("syslink");
exit(1);
}
printf("fds %d %d\n", info.cmd_new.fds[0], info.cmd_new.fds[1]);
if (fork() == 0) {
reader(info.cmd_new.fds[0]);
} else {
writer(info.cmd_new.fds[1]);
}
while (wait(NULL) > 0)
;
return(0);
}
static
void
writer(int fd)
{
union syslink_small_msg cmd;
union syslink_small_msg rep;
int *dmabuf;
int n;
int waitforit = 10;
off_t bytes = 0;
dmabuf = mmap(NULL, BUFSIZE, PROT_READ|PROT_WRITE, MAP_ANON, -1, 0);
bzero(&cmd, sizeof(cmd));
cmd.msg.sm_bytes = sizeof(struct syslink_msg);
cmd.msg.sm_proto = SMPROTO_BSDVFS;
cmd.msg.sm_msgid = 1;
cmd.msg.sm_head.se_cmd = 0 | SE_CMDF_DMAR | SE_CMDF_DMAW;
cmd.msg.sm_head.se_bytes = sizeof(cmd.msg.sm_head);
dmabuf[0] = 0;
dmabuf[4095] = 0;
for (;;) {
struct iovec iov[2];
iov[0].iov_base = (char *)&cmd;
iov[0].iov_len = cmd.msg.sm_bytes;
iov[1].iov_base = (char *)dmabuf;
iov[1].iov_len = BUFSIZE;
if (dmabuf[0] < 0)
--dmabuf[0];
else
++dmabuf[0];
--dmabuf[4095];
/*printf("write n = %d dmabuf[0] = %d\n", n, dmabuf[0]);*/
n = writev(fd, iov, 2);
bytes += BUFSIZE;
if (bytes % (1024 * 1024 * 1024) == 0) {
printf("%lld\r", bytes);
fflush(stdout);
}
if (n < 0) {
printf("write error %s\n", strerror(errno));
} else if (waitforit) {
/* fake up a pipeline */
--waitforit;
} else {
n = read(fd, &rep, sizeof(rep));
/*printf("read-reply %d %lld dmabuf[0] = %d\n",
n, rep.msg.sm_msgid, dmabuf[0]);*/
}
++cmd.msg.sm_msgid;
}
}
static
void
reader(int fd)
{
union syslink_small_msg cmd;
union syslink_small_msg rep;
int *dmabuf;
int n;
dmabuf = mmap(NULL, BUFSIZE, PROT_READ|PROT_WRITE, MAP_ANON, -1, 0);
bzero(&rep, sizeof(rep));
rep.msg.sm_bytes = sizeof(struct syslink_msg);
rep.msg.sm_proto = SMPROTO_BSDVFS | SM_PROTO_REPLY;
rep.msg.sm_head.se_cmd = SE_CMDF_REPLY;
rep.msg.sm_head.se_bytes = sizeof(rep.msg.sm_head);
for (;;) {
struct iovec iov[2];
iov[0].iov_base = (char *)&cmd;
iov[0].iov_len = sizeof(cmd);
iov[1].iov_base = (char *)dmabuf;
iov[1].iov_len = BUFSIZE;
n = readv(fd, iov, 2);
if (n < 0 && errno == ENOSPC) {
printf("no space\n");
exit(1);
}
if (n < 0) {
printf("read error %s\n", strerror(errno));
} else {
/*printf("read n = %d dmabuf[0] = %d [4095] = %d\n",
n, dmabuf[0], dmabuf[4095]);*/
rep.msg.sm_msgid = cmd.msg.sm_msgid;
dmabuf[0] = -dmabuf[0];
iov[0].iov_base = (char *)&rep;
iov[0].iov_len = rep.msg.sm_bytes;
/*n = write(fd, &rep, rep.msg.sm_bytes);*/
n = writev(fd, iov, 2);
if (n < 0) {
printf("reply error %s\n", strerror(errno));
}
}
if (n < 0)
break;
/*sleep(1);*/
}
}