12-06-2007
With what operating system, environment, hardware etc?
If you are talking about DOS, just stick in a simple TSR with redirector, if you are talking about a more complex OS it's a driver responsibility.
Out of interest, why, as a program, would you care whether a disk access has occurred?
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DOSSRV(4) Kernel Interfaces Manual DOSSRV(4)
NAME
dossrv, 9660srv, a:, b:, c:, eject - DOS and ISO9660 file systems
SYNOPSIS
dossrv [ -v ] [ -s ] [ -f file ] [ service ]
9660srv [ -v ] [ -s ] [ -f file ] [ service ]
a:
b:
c:
eject [ n ]
DESCRIPTION
Dossrv is a file server that interprets DOS file systems. A single instance of dossrv can provide access to multiple DOS disks simultane-
ously.
Dossrv posts a file descriptor named service (default dos) in the /srv directory. To access the DOS file system on a device, use mount
with the spec argument (see bind(1)) the name of the file holding raw DOS file system, typically the disk. If spec is undefined in the
mount, dossrv will use file as the default name for the device holding the DOS system.
Normally dossrv creates a pipe to act as the communications channel between itself and its clients. The -s flag instructs dossrv to use
its standard input and output instead. The kernels use this if they are booting from a DOS disk. This flag also prevents the creation of
an explicit service file in /srv.
The -v flag causes verbose output for debugging.
The shell script a: contains
unmount /n/a: >[2] /dev/null
mount -c /srv/dos /n/a: /dev/fd0disk
and is therefore a shorthand for mounting a floppy disk in drive A. The scripts b: and c: are similar.
9660srv is identical to dossrv in specification, except that it interprets ISO9660 CD-ROM file systems instead of DOS file systems.
If the floppy drive has an ejection motor, eject will spit out the floppy from drive n, default 0.
EXAMPLE
Mount a floppy disk with a DOS file system on it.
dossrv
a:
SEE ALSO
kfs(4)
SOURCE
/sys/src/cmd/dossrv
/sys/src/cmd/9660srv
/rc/bin/eject
DOSSRV(4)