1 /*-
2  * Copyright (c) 2008 Peter Holm <pho@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, 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  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  */
27 
28 #include <unistd.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <fcntl.h>
32 #include <sys/stat.h>
33 #include <sys/param.h>
34 #include <sys/mman.h>
35 #include <err.h>
36 #include <string.h>
37 #include <errno.h>
38 
39 #include "stress.h"
40 
41 static char path[128];
42 
43 #define INPUTFILE "/bin/date"
44 
45 int
46 setup(int nb)
47 {
48 	umask(0);
49 
50 	sprintf(path,"%s.%05d", getprogname(), getpid());
51 	if (mkdir(path, 0770) < 0)
52 		err(1, "mkdir(%s), %s:%d", path, __FILE__, __LINE__);
53 
54 	if (chdir(path) == -1)
55 		err(1, "chdir(%s), %s:%d", path, __FILE__, __LINE__);
56 
57 	return (0);
58 }
59 
60 void
61 cleanup(void)
62 {
63 	(void)chdir("..");
64 	if (rmdir(path) == -1) {
65 		warn("rmdir(%s), %s:%d", path, __FILE__, __LINE__);
66 	}
67 
68 }
69 
70 int
71 test(void)
72 {
73 	int i;
74 	pid_t pid;
75 	char file[128];
76 	int fdin, fdout;
77 	char *src, *dst;
78 	struct stat statbuf;
79 
80 	pid = getpid();
81 	for (i = 0; i < 100 && done_testing == 0; i++) {
82 		sprintf(file,"p%05d.%05d", pid, i);
83 
84 		if ((fdin = open(INPUTFILE, O_RDONLY)) < 0)
85 			err(1, INPUTFILE);
86 
87 		if ((fdout = open(file, O_RDWR | O_CREAT | O_TRUNC, 0600)) < 0)
88 			err(1, "%s", file);
89 
90 		if (fstat(fdin, &statbuf) < 0)
91 			err(1, "fstat error");
92 
93 		if (lseek(fdout, statbuf.st_size - 1, SEEK_SET) == -1)
94 			err(1, "lseek error");
95 
96 		/* write a dummy byte at the last location */
97 		if (write(fdout, "", 1) != 1)
98 			err(1, "write error");
99 
100 		if ((src = mmap(0, statbuf.st_size, PROT_READ, MAP_SHARED, fdin, 0)) ==
101 			(caddr_t) - 1)
102 			err(1, "mmap error for input");
103 
104 		if ((dst = mmap(0, statbuf.st_size, PROT_READ | PROT_WRITE,
105 			MAP_SHARED, fdout, 0)) == (caddr_t) - 1)
106 			err(1, "mmap error for output");
107 
108 		memcpy(dst, src, statbuf.st_size);
109 
110 
111 		if (munmap(src, statbuf.st_size) == -1)
112 			err(1, "munmap");
113 		close(fdin);
114 
115 		if (munmap(dst, statbuf.st_size) == -1)
116 			err(1, "munmap");
117 		close(fdout);
118 
119 		if (unlink(file) == -1)
120 			err(3, "unlink(%s)", file);
121 	}
122 
123 
124 	return (0);
125 }
126