1#!/bin/sh
2
3#
4# Copyright (c) 2012 Peter Holm <pho@FreeBSD.org>
5# All rights reserved.
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# 1. Redistributions of source code must retain the above copyright
11#    notice, this list of conditions and the following disclaimer.
12# 2. Redistributions in binary form must reproduce the above copyright
13#    notice, this list of conditions and the following disclaimer in the
14#    documentation and/or other materials provided with the distribution.
15#
16# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26# SUCH DAMAGE.
27#
28
29# Test with read/write length of INT_MAX (i386) or INT_MAX+1 (amd64)
30
31# Seen:
32# rdwr:  readv(). Expected 2147483648 (80000000), got -2147483648 (ffffffff80000000) bytes: No error: 0
33# rdwr: writev(). Expected 2147483648 (80000000), got -2147483648 (ffffffff80000000) bytes: No error: 0
34# Fixed by: 78101d437a92
35
36. ../default.cfg
37
38[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
39
40odir=`pwd`
41cd /tmp
42sed '1,/^EOF/d' < $odir/$0 > rdwr.c
43mycc -o rdwr -Wall rdwr.c || exit
44rm -f rdwr.c
45
46oldclamp=`sysctl debug.devfs_iosize_max_clamp 2>/dev/null |
47    awk '{print $NF}'`
48if [ `uname -m` = amd64 ]; then
49	[ "$oldclamp" = "1" ] && sysctl debug.devfs_iosize_max_clamp=0
50fi
51for j in `jot 10`; do
52	/tmp/rdwr || { echo FAIL; break; }
53done
54if [ `uname -m` = amd64 ]; then
55	[ "$oldclamp" = "1" ] && sysctl debug.devfs_iosize_max_clamp=1
56fi
57
58rm -f /tmp/rdwr
59exit
60EOF
61#include <sys/types.h>
62#include <sys/limits.h>
63#include <sys/mman.h>
64#include <sys/uio.h>
65#include <err.h>
66#include <fcntl.h>
67#include <unistd.h>
68
69static int s;
70
71static void
72er(char * syscall, size_t len, ssize_t ret)
73{
74	warn("%8s. Expected %zu (%zx), got %zd (%zx) bytes",
75	    syscall, len, len, ret, ret);
76	s=1;
77}
78
79int
80main(int argc, char **argv)
81{
82	int fd1, fd2;
83	size_t len;
84	ssize_t r;
85	void *p;
86	struct iovec iov;
87
88	alarm(120);
89	if ((fd1 = open("/dev/null", O_RDWR, 0)) == -1)
90		err(1, "open /dev/null");
91
92	if ((fd2 = open("/dev/zero", O_RDWR)) == -1)
93		err(1, "open /dev/zero");
94
95	if (sizeof(size_t) == sizeof(int32_t))
96		len = (size_t)INT_MAX;		/* i386  */
97	else
98		len = (size_t)INT_MAX + 1;	/* amd64 */
99
100	if ((p = mmap(0, len, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd2, 0)) ==
101                        MAP_FAILED)
102		err(1, "mmap");
103
104	if ((r = read(fd2, p, len)) != len)
105		er("read()", len, r);
106
107	if ((r = write(fd1, p, len)) != len)
108		er("write()", len, r);
109
110	if ((r = pread(fd2, p, len, 0)) != len)
111		er("pread()", len, r);
112
113	if ((r = pwrite(fd1, p, len, 0)) != len)
114		er("pwrite()", len, r);
115
116	iov.iov_base = p;
117	iov.iov_len = len;
118	if ((r = readv(fd2, &iov, 1)) != len)
119		er("readv()", len, r);
120
121	if ((r = writev(fd1, &iov, 1)) != len)
122		er("writev()", len, r);
123
124	if ((r = preadv(fd2, &iov, 1, 0)) != len)
125		er("preadv()", len, r);
126
127	if ((r = pwritev(fd1, &iov, 1, 0)) != len)
128		er("pwritev()", len, r);
129
130	close(fd1);
131	close(fd2);
132
133	return (s);
134}
135