01-22-2002
I see,
Here is a bit more information. I haven't seen this before. I don't understand. I am logged in as root.
# mount
/ on /dev/md/dsk/d0 read/write/setuid/intr/largefiles/logging/onerror=panic/dev=1540000 on Wed Nov 28 16:11:35 2001
/usr on /dev/md/dsk/d4 read/write/setuid/intr/largefiles/logging/onerror=panic/dev=1540004 on Wed Nov 28 16:11:37 2001
/proc on /proc read/write/setuid/dev=3fc0000 on Wed Nov 28 16:11:33 2001
/dev/fd on fd read/write/setuid/dev=4080000 on Wed Nov 28 16:11:38 2001
/etc/mnttab on mnttab read/write/setuid/dev=4180000 on Wed Nov 28 16:11:40 2001
/var on /dev/md/dsk/d2 read/write/setuid/intr/largefiles/logging/onerror=panic/dev=1540002 on Wed Nov 28 16:11:41 2001
/var/run on swap read/write/setuid/dev=1 on Wed Nov 28 16:11:41 2001
/tmp on swap read/write/setuid/dev=2 on Wed Nov 28 16:11:45 2001
/opt on /dev/md/dsk/d3 read/write/setuid/intr/largefiles/logging/onerror=panic/dev=1540003 on Wed Nov 28 16:11:45 2001
/export/home on /dev/md/dsk/d5 read/write/setuid/intr/largefiles/logging/onerror=panic/dev=1540005 on Wed Nov 28 16:11:46 2001
# pwd
/
# ls -la |grep home
dr-xr-xr-x 1 root root 1 Nov 28 16:11 home
# mkdir /home/test
mkdir: Failed to make directory "/home/test"; Operation not applicable
Can anyone help please?
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mem(7D) Devices mem(7D)
NAME
mem, kmem, allkmem - physical or virtual memory access
SYNOPSIS
/dev/mem
/dev/kmem
/dev/allkmem
DESCRIPTION
The file /dev/mem is a special file that provides access to the physical memory of the computer.
The file /dev/kmem is a special file that provides access to the virtual address space of the operating system kernel, excluding memory
that is associated with an I/O device.
The file /dev/allkmem is a special file that provides access to the virtual address space of the operating system kernel, including memory
that is associated with an I/O device. You can use any of these devices to examine and modify the system.
Byte addresses in /dev/mem are interpreted as physical memory addresses. Byte addresses in /dev/kmem and /dev/allkmem are interpreted as
kernel virtual memory addresses. A reference to a non-existent location returns an error. See ERRORS for more information.
The file /dev/mem accesses physical memory; the size of the file is equal to the amount of physical memory in the computer. This size may
be larger than 4GB on a system running the 32-bit operating environment. In this case, you can access memory beyond 4GB using a series of
read(2) and write(2) calls, a pread64() or pwrite64() call, or a combination of llseek(2) and read(2) or write(2).
ERRORS
EFAULT Occurs when trying to write(2) a read-only location (allkmem), read(2) a write-only location (allkmem), or read(2) or
write(2) a non-existent or unimplemented location (mem, kmem, allkmem).
EIO Occurs when trying to read(2) or write(2) a memory location that is associated with an I/O device using the /dev/kmem spe-
cial file.
ENXIO Results from attempting to mmap(2) a non-existent physical (mem) or virtual (kmem, allkmem) memory address.
FILES
/dev/mem Provides access to the computer's physical memory.
/dev/kmem Provides access to the virtual address space of the operating system kernel, excluding memory that is associated with an
I/O device.
/dev/allkmem Provides access to the virtual address space of the operating system kernel, including memory that is associated with an
I/O device.
SEE ALSO
llseek(2), mmap(2), read(2), write(2)
WARNINGS
Using these devices to modify (that is, write to) the address space of a live running operating system or to modify the state of a
hardware device is extremely dangerous and may result in a system panic if kernel data structures are damaged or if device state is
changed.
SunOS 5.10 18 Feb 2002 mem(7D)