4 # Copyright (c) 2012 Peter Holm <pho@FreeBSD.org>
7 # Redistribution and use in source and binary forms, with or without
8 # modification, are permitted provided that the following conditions
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.
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
29 # Test with read/write length of INT_MAX (i386) or INT_MAX+1 (amd64)
33 [ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
37 sed '1,/^EOF/d' < $odir/$0 > rdwr.c
38 mycc -o rdwr -Wall rdwr.c || exit
41 oldclamp=`sysctl debug.devfs_iosize_max_clamp 2>/dev/null |
43 if [ `uname -m` = amd64 ]; then
44 [ "$oldclamp" = "1" ] && sysctl debug.devfs_iosize_max_clamp=0
47 /tmp/rdwr || { echo FAIL; break; }
49 if [ `uname -m` = amd64 ]; then
50 [ "$oldclamp" = "1" ] && sysctl debug.devfs_iosize_max_clamp=1
56 #include <sys/types.h>
57 #include <sys/limits.h>
65 main(int argc, char **argv)
73 if ((fd1 = open("/dev/null", O_RDWR, 0)) == -1)
74 err(1, "open /dev/null");
76 if ((fd2 = open("/dev/zero", O_RDWR)) == -1)
77 err(1, "open /dev/zero");
79 if (sizeof(size_t) == sizeof(int32_t))
80 len = (size_t)INT_MAX; /* i386 */
82 len = (size_t)INT_MAX + 1; /* amd64 */
84 if ((p = mmap(0, len, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd2, 0)) ==
88 if (read(fd2, p, len) != len)
91 if (write(fd1, p, len) != len)
94 if (pread(fd2, p, len, 0) != len)
97 if (pwrite(fd1, p, len, 0) != len)
102 if (readv(fd2, &iov, 1) != len)
105 if (writev(fd1, &iov, 1) != len)
108 if (preadv(fd2, &iov, 1, 0) != len)
111 if (pwritev(fd1, &iov, 1, 0) != len)