1 /*-
2 * Copyright (c) 2006, Stephan Uphoff <ups@freebsd.org>
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 unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 * $FreeBSD: stable/12/tools/test/upsdl/upsdl.c 372413 2022-08-19 22:33:03Z asomers $
27 */
28
29
30 #include <sys/types.h>
31 #include <unistd.h>
32 #include <sys/stat.h>
33 #include <fcntl.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <sys/mman.h>
37
38
39 int prepareFile(const char* filename,int* fdp);
40 int mapBuffer(char** bufferp,int fd1,int fd2);
41 int startIO(int fd,char *buffer);
42
43 static int pagesize;
44
45 #define FILESIZE (32*1024)
46 static char wbuffer[FILESIZE];
47
48 /* Create a FILESIZE sized file - then remove file data from the cache*/
prepareFile(const char * filename,int * fdp)49 int prepareFile(const char* filename,int* fdp)
50 {
51 int fd;
52 int len;
53 int status;
54 void *addr;
55
56 fd = open(filename,O_CREAT | O_TRUNC | O_RDWR,S_IRWXU);
57 if (fd == -1)
58 {
59 perror("Creating file");
60 return fd;
61 }
62
63 len = write(fd,wbuffer,FILESIZE);
64 if (len < 0)
65 {
66 perror("Write failed");
67 return 1;
68 }
69
70 status = fsync(fd);
71 if (status != 0)
72 {
73 perror("fsync failed");
74 return 1;
75 }
76
77 addr = mmap(NULL,FILESIZE, PROT_READ | PROT_WRITE , MAP_SHARED, fd, 0);
78 if (addr == MAP_FAILED)
79 {
80 perror("Mmap failed");
81 return 1;
82 }
83
84 status = msync(addr,FILESIZE,MS_INVALIDATE | MS_SYNC);
85 if (status != 0)
86 {
87 perror("Msync failed");
88 return 1;
89 }
90
91 munmap(addr,FILESIZE);
92
93 *fdp = fd;
94 return 0;
95 }
96
97
98 /* mmap a 2 page buffer - first page is from fd1, second page from fd2 */
mapBuffer(char ** bufferp,int fd1,int fd2)99 int mapBuffer(char** bufferp,int fd1,int fd2)
100 {
101 void* addr;
102 char *buffer;
103
104 addr = mmap(NULL,pagesize*2, PROT_READ | PROT_WRITE , MAP_SHARED, fd1, 0);
105 if (addr == MAP_FAILED)
106 {
107 perror("Mmap failed");
108 return 1;
109 }
110
111 buffer = addr;
112 addr = mmap(buffer + pagesize,pagesize, PROT_READ | PROT_WRITE , MAP_FIXED |
113 MAP_SHARED, fd2, 0);
114
115 if (addr == MAP_FAILED)
116 {
117 perror("Mmap2 failed");
118 return 1;
119 }
120 *bufferp = buffer;
121 return 0;
122 }
123
124
startIO(int fd,char * buffer)125 int startIO(int fd,char *buffer)
126 {
127 ssize_t len;
128 len = write(fd,buffer,2*pagesize);
129 if (len == -1)
130 {
131 perror("write failed");
132 return 1;
133 }
134 return 0;
135 }
136
137
main(int argc __unused,char * argv[]__unused)138 int main(int argc __unused, char *argv[] __unused)
139 {
140
141 int fdA,fdB,fdDelayA,fdDelayB;
142 int status;
143 char *bufferA,*bufferB;
144 pid_t pid;
145
146 pagesize = getpagesize();
147
148 if ((prepareFile("A",&fdA))
149 || (prepareFile("B",&fdB))
150 || (prepareFile("DelayA",&fdDelayA))
151 || (prepareFile("DelayB",&fdDelayB))
152 || (mapBuffer(&bufferA,fdDelayA,fdB))
153 || (mapBuffer(&bufferB,fdDelayB,fdA)))
154 exit(1);
155
156 pid = fork();
157
158 if (pid == 0)
159 {
160 status = startIO(fdA,bufferA);
161 exit(status);
162 }
163
164 if (pid == -1)
165 {
166 exit(1);
167 }
168 status = startIO(fdB,bufferB);
169 exit(status);
170
171 }
172
173
174
175
176
177