umount(2)umount(2)NAMEumount - unmount a file system
C SYNOPSIS
#include <sys/mount.h>
int umount(const char *file);
DESCRIPTIONumount requests that a previously mounted file system contained 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 a process with the super-user privilege.
umount will fail if one or more of the following are true:
EPERM The calling process does not have the super-user
privilege.
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 component exceeds {NAME_MAX}
while _POSIX_NO_TRUNC is in effect.
ENOTDIR file does not point to a directory.
ENOENT A component ofthe path prefix does not exist or is a
null pathname.
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machine is no longer active.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)umount(2)SEE ALSOmount(2).
DIAGNOSTICS
Upon successful completion a value of 0 is returned. Otherwise, a value
of -1 is returned and errno is set to indicate the error.
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