UMOUNT(2-SVR4)      RISC/os Reference Manual       UMOUNT(2-SVR4)



NAME
     umount - unmount a file system

SYNOPSIS
     #include <sys/mount.h>

     int umount(const char *file);

DESCRIPTION
     umount requests that a previously mounted file system con-
     tained on the block special device or directory identified
     by file be unmounted.  file is a pointer to a path name.
     After unmounting the file system, the directory upon which
     the file system was mounted reverts to its ordinary
     interpretation.

     umount may be invoked only by the superuser.

     umount will fail if one or more of the following are true:

     EPERM               The process's effective user ID is not
                         superuser.

     EINVAL              file does not exist.

     ELOOP               Too many symbolic links were encountered
                         in translating the path pointed to by
                         file.

     ENAMETOOLONG        The length of the file argument exceeds
                         {PATH_MAX}, or the length of a file com-
                         ponent exceeds {NAME_MAX} while
                         _POSIX_NO_TRUNC is in effect.

     ENOTBLK             file is not a block special device.

     EINVAL              file is not mounted.

     EBUSY               A file on file is busy.

     EFAULT              file points to an illegal address.

     EREMOTE             file is remote.

     ENOLINK             file is on a remote machine, and the
                         link to that machine is no longer
                         active.

     EMULTIHOP           Components of the path pointed to by
                         file require hopping to multiple remote
                         machines.




                        Printed 11/19/92                   Page 1

UMOUNT(2-SVR4)      RISC/os Reference Manual       UMOUNT(2-SVR4)



SEE ALSO
     mount(2).

DIAGNOSTICS
     Upon successful completion a value of 0 is returned.  Other-
     wise, a value of -1 is returned and errno is set to indicate
     the error.
















































 Page 2                 Printed 11/19/92