mount.2

Unix操作系统minix 2.0源码

.TH MOUNT 2
.SH NAME
mount, umount \- mount or umount a file system
.SH SYNOPSIS
.ft B
.nf
#include <unistd.h>
#include <sys/mount.h>

int mount(char *\fIspecial\fP, char *\fIname\fP, int \fIflag\fP)
int umount(char *\fIname\fP)
.fi
.ft P
.SH DESCRIPTION
.B Mount()
tells the system that the file system
.I special
is to be mounted on the file
.IR name ,
effectively overlaying
.I name
with the file tree on
.IR special .
.I Name
may of any type, except that if the root of
.I special
is a directory, then
.I name
must also be a directory.
.I Special
must be a block special file, except for loopback mounts.  For loopback
mounts a normal file or directory is used for
.IR special ,
which must be seen as the root of a virtual device.
.I Flag
is 0 for a read-write mount, 1 for read-only.
.PP
.B Umount()
removes the connection between a device and a mount point,
.I name
may refer to either of them.  If more than one device is mounted on the
same mount point then unmounting at the mount point removes the last mounted
device, unmounting a device removes precisely that device.  The unmount will
only succeed if none of the files on the device are in use.
.PP
Both calls may only be executed by the super-user.
.SH "SEE ALSO"
.BR mount (1),
.BR umount (1).
.SH AUTHOR
Kees J. Bot ([e-mail])