sunos man page for umount

umount(2)							   System Calls 							 umount(2)

NAME
       umount, umount2 - unmount a file system

SYNOPSIS
       #include <sys/mount.h>

       int umount(const char *file);

       int umount2(const char *file, int mflag);

DESCRIPTION
       The  umount()   function requests that a previously mounted file system contained on a block special device or directory be unmounted.  The
       file argument is a pointer to the absolute pathname of the file system to be unmounted. After unmounting the  file  system,  the  directory
       upon which the file system was mounted reverts to its ordinary interpretation.

       The  umount2()	function  is identical to umount(), with the additional capability of unmounting file systems even if there are open files
       active. The mflag argument must contain one of the following values:

       0	       Perform a normal unmount that is equivalent to umount(). The umount2() function	returns EBUSY  if  there  are  open  files
		       active within the file system to be unmounted.

       MS_FORCE        Unmount	the file system, even if there are open files active. A forced unmount can result in loss of data, so it should be
		       used only when a regular unmount is unsuccessful. The umount2() function  returns ENOTSUP if  the  specified  file  systems
		       does not support MS_FORCE. Currently only nfs- and ufs-type file systems support MS_FORCE.

RETURN VALUES
       Upon successful completion, 0 is returned. Otherwise, -1 is returned and errno is set to indicate the error.

ERRORS
       The umount() and umount2() functions will fail if:

       EACCES		       The  permission	bits of the mount point do not permit read/write access or search permission is denied on a compo-
			       nent of the path prefix.

			       The calling process is not the owner of the mountpoint.

			       The mountpoint is not a regular file or a directory and the caller does not have all privileges available in a  its
			       zone.

			       The  special  device device does not permit read access in the case of read-only mounts or read-write access in the
			       case of read/write mounts.

       EBUSY		       A file on file is busy.

       EFAULT		       The file pointed to by file points to an illegal address.

       EINVAL		       The file pointed to by file is not mounted.

       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  component  exceeds  NAME_MAX  while
			       _POSIX_NO_TRUNC is in effect.

       ENOENT		       The file pointed to by file does not exist or is not an absolute path.

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

       ENOTBLK		       The file pointed to by file is not a block special device.

       EPERM		       The {PRIV_SYS_MOUNT} privilege is not asserted in the effective set of the calling process.

       EREMOTE		       The file pointed to by file is remote.

       The umount2() function will fail if:

       ENOTSUP		       The file pointed to by file does not support this operation.

USAGE
       The  umount()  and  umount2()  functions can be invoked only by a process that has the {PRIV_SYS_MOUNT} privilege asserted in its effective
       set.

       Because it provides greater functionality, the umount2() function is preferred.

SEE ALSO
       mount(2), privileges(5)

SunOS 5.10							    22 Mar 2004 							 umount(2)