MOUNT(2)                COMMAND REFERENCE                MOUNT(2)



NAME
     mount, umount - mount or remove file system

SYNOPSIS
     mount(special, path, rwflag)
     char *special, *path;
     int rwflag;

     umount(special)
     char *special;

DESCRIPTION
     Mount announces to the system that a removable file system
     has been mounted on the block special file special. After
     successful completion, references to file path will refer to
     the root file on the newly mounted file system.  Special and
     path are pointers to null-terminated strings containing the
     appropriate pathnames.

     Path must exist already.  Path must be a directory.  Its old
     contents are inaccessible while the file system is mounted.

     The rwflag argument is used to control write permission on
     the mounted file system.  If rwflag is 0, writing is
     allowed.  If it is non-zero, no writing can be done.
     Physically write-protected and magnetic tape file systems
     must be mounted read-only or errors will occur when access
     times are updated, whether or not any explicit write is
     attempted.

     Umount announces to the system that the special file is no
     longer to contain a removable file system.  The associated
     file reverts to its ordinary interpretation.

     These calls are limited to the super-user.

DIAGNOSTICS
     Mount and umount will fail when one of the following occurs:

     [EPERM]
         The caller is not the super-user.

     [ENOENT]
         Special or path does not exist.

     [ENOENT]
         A component of the path prefix of special or path does
         not exist.

     [ENAMETOOLONG]
         The argument special or path is too long.




Printed 10/17/86                                                1

MOUNT(2)                COMMAND REFERENCE                MOUNT(2)



     [ENOTBLK]
         Special is not a block device.

     [ENXIO]
         The major device number of special is out of range (this
         indicates no device driver exists for the associated
         hardware).

     [ENOASCII]
         The pathname special or path contains a character with
         the high-order bit set.

     [ELOOP]
         Too many symbolic links were encountered in translating
         a pathname.

     [EDFSREF]
         Path may not reference a file system on another host.

     [EIO]
         An I/O error occured while reading from or writing to
         the file system.

     In addition, mount will fail when one or more of the
     following occurs:

     [ENOTDIR]
         Path is not a directory.

     [EBUSY]
         Another process currently holds a reference to path.

     [ENOMEM]
         No space remains in the mount table.

     [EINVAL]
         The super block for the file system has a bad magic
         number or an out-of-range block size.

     [ENOMEM]
         Not enough memory is available to read the cylinder
         group information for the file system.

     [EIO]
         An I/O error occurred while reading the super block or
         cylinder group information.

     [EIO]
         An I/O error occurred while accessing the device.

     [EACCES]
         Search permission is denied for a component of the



Printed 10/17/86                                                2

MOUNT(2)                COMMAND REFERENCE                MOUNT(2)



         pathname prefix of path or special.

     [EFAULT]
         Special or path points outside the process's allocated
         address space.

     In addition, umount will fail when one or more of the
     following occurs:

     [EINVAL]
         The requested device is not in the mount table.

     [EBUSY]
         A process is holding a reference to a file located on
         the file system.

     [EACCES]
         Search permission is denied for a component of the
         pathname prefix of special.

     [EFAULT]
         Special points outside the process's allocated address
         space.

RETURN VALUE
     Upon successful completion, a value of 0 is returned.
     Otherwise, a value of -1 is returned and errno is set to
     indicate the error.

SEE ALSO
     mount(8), umount(8).
























Printed 10/17/86                                                3

%%index%%
na:72,79;
sy:151,676;
de:827,1340;
di:2167,561;2872,1490;4506,722;
rv:5228,236;
se:5464,124;
%%index%%000000000126