umount.2

UNIX v6源代码 这几乎是最经典的unix版本 unix操作系统设计和莱昂氏unix源代码分析都是用的该版

.th UMOUNT II 8/5/73
.sh NAME
umount \*- dismount file system
.sh SYNOPSIS
(umount = 22.)
.br
.ft B
sys  umount; special
.ft R
.sh DESCRIPTION
.it Umount
announces to the system that special
file
.it special
is no longer to contain
a removable file system.
The file associated with the special
file reverts to its ordinary interpretation;
see
.it mount
(II).
.s3
.sh "SEE ALSO"
umount (VIII), mount (II)
.sh DIAGNOSTICS
Error bit
(c-bit) set if
no
file system was mounted on the special file
or if there are still active files on the
mounted file system.