umount(2) SYSTEM CALLS umount(2)
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 super-user.
umount will fail if one or more of the following are true:
EPERM The process's effective user ID is not
super-user.
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
{PATHMAX}, or the length of a file com-
ponent exceeds {NAMEMAX} while
POSIXNOTRUNC 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link to that machine is no longer
active.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.
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umount(2) SYSTEM CALLS umount(2)
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.
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