umount(2) — sys5



UMOUNT(2)       DOMAIN/IX Reference Manual (SYS5)       UMOUNT(2)



NAME
     umount - unmount a file system

USAGE
     int umount (spec)
     char *spec;

DESCRIPTION
     The umount system call requests that a previously mounted
     file system contained on the block special device identified
     by spec be unmounted.  The spec parameter is a pointer to a
     pathname.  After unmounting the file system, umount removes
     the directory upon which the file system was mounted. This
     feature represents an enhancement to the way that umount
     normally works on standard UNIX system software.

     Only the super-user may invoke umount.

     If one or more of the following are true, umount fails:

     [EPERM]        The process's effective user ID is not
                    super-user.

     [ENXIO]        Spec does not exist.

     [ENOTBLK]      Spec is not a block special device.

     [EINVAL]       Spec is not mounted.

     [EBUSY]        A file on spec is busy.

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

RETURN VALUE
     Upon successful completion, umount returns a value of 0.
     Otherwise, it returns a value of -1 and sets errno to indi-
     cate the error.

RELATED INFORMATION
     mkdisk(1M)
     mount(2)













Printed 1/27/86                                          UMOUNT-1
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