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MOUNT(2)                      System Calls Manual                     MOUNT(2)

       mount, umount - mount or remove file system

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

       char *special;

       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.


       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.

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

       (umount = 22.)
       sys umount; special