v7 man page for mount

MOUNT(2)							System Calls Manual							  MOUNT(2)

NAME
       mount, umount - mount or remove file system

SYNOPSIS
       mount(special, name, rwflag)
       char *special, *name;

       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, ref-
       erences to file name will refer to the root file on the newly mounted file system.   Special  and  name	are  pointers  to  null-terminated
       strings containing the appropriate path names.

       Name  must  exist already.  Name must be a directory (unless the root of the mounted file system is not a directory).  Its old contents are
       inaccessible while the file system is mounted.

       The rwflag argument determines whether the file system can be written on; if it is 0 writing is allowed, if non-zero no	writing  is  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.

SEE ALSO
       mount(1)

DIAGNOSTICS
       Mount  returns  0  if  the action occurred; -1 if special is inaccessible or not an appropriate 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.

ASSEMBLER
       (mount = 21.)
       sys mount; special; name; rwflag

       (umount = 22.)
       sys umount; special

																	  MOUNT(2)