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BSD 2.11 - man page for mount (bsd section 2)

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MOUNT(2)										 MOUNT(2)

NAME
       mount, umount - mount or remove file system

SYNOPSIS
       mount(special, name, flags)
       char *special, *name;
       int flags;

       umount(special)
       char *special;

DESCRIPTION
       Mount  announces to the system that a removable file system has been mounted on the block-
       structured special file special; from now on, references to file name will  refer  to  the
       root  file on the newly mounted file system.  Special and name are pointers to null-termi-
       nated strings containing the appropriate path names.

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

       The following flags may be specified to suppress default semantics which affect filesystem
       access.

       MNT_RDONLY	   The filesystem should be treated as read-only; Even the super-user may
			   not write on it.

       MNT_NOEXEC	   Do not allow files to be executed from the filesystem.

       MNT_NOSUID	   Do not honor setuid or setgid bits on files when executing them.

       MNT_NODEV	   Do not interpret special files on the filesystem.

       MNT_SYNCHRONOUS	   All I/O to the filesystem should be done synchronously.

       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.

RETURN VALUE
       Mount returns 0 if the action occurred, -1 if special is inaccessible or not an	appropri-
       ate  file, if name does not exist, if special is already mounted, if name is in use, or if
       there are already too many file systems mounted.

       Umount returns 0 if the action occurred; -1 if if the special file is inaccessible or does
       not have a mounted file system, or if there are active files in the mounted file system.

ERRORS
       Mount will fail when one of the following occurs:

       [ENAMETOOLONG] A  component  of	either	pathname  exceeded  255 characters, or the entire
		      length of either path name exceeded 1023 characters.

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

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

       [ENOENT]       A component of name does not exist.

       [ENODEV]       A component of special does not exist.

       [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).

       [ENOTDIR]      A  component of name is not a directory, or a path prefix of special is not
		      a directory.

       [EINVAL]       Either pathname contains a character with the high-order bit set.

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

       [EBUSY]	      Another  process currently holds a reference to name, or special is already
		      mounted.

       [EMFILE]       No space remains in the mount table.

       [ENOMEM]       Not enough memory was 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.

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

       Umount may fail with one of the following errors:

       [ENOTDIR]      A component of the path prefix is not a directory.

       [EINVAL]       The pathname contains a character with the high-order bit set.

       [ENAMETOOLONG] A component of a pathname exceeded 255 characters, or an entire  path  name
		      exceeded 1023 characters.

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

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

       [ENODEV]       Special does not exist.

       [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).

       [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.

       [EIO]	      An I/O error occurred while writing the super block or  other  cached  file
		      system information.

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

SEE ALSO
       mount(8), umount(8)

BUGS
       Some of the error codes need translation to more obvious messages.

       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.

       MNT_SYNCHRONOUS	is  not  currently implemented in the kernel but may be specified because
       the kernel ignores it.

4th Berkeley Distribution		 January 25, 1996				 MOUNT(2)
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