mount, umount - mount or remove file system
mount(special, name, rwflag)
char *special, *name;
Mount announces to the system that a removable file system has been
mounted on the block-structured special file special; from now on, ref-
erences to file name will refer to the root file on the newly mounted
file system. Special and name are pointers to null-terminated strings
containing the appropriate path names.
Name must exist already. Name must be a directory (unless the root of
the mounted file system is not a directory). Its old contents are
inaccessible while the file system is mounted.
The rwflag argument determines whether the file system can be written
on; if it is 0 writing is allowed, if non-zero no writing is done.
Physically write-protected and magnetic tape file systems must be
mounted read-only or errors will occur when access times are updated,
whether or not any explicit write is attempted.
Umount announces to the system that the special file is no longer to
contain a removable file system. The associated file reverts to its
Mount returns 0 if the action occurred; -1 if special is inaccessible
or not an appropriate file; if name does not exist; if special is
already mounted; if name is in use; or if there are already too many
file systems mounted.
Umount returns 0 if the action occurred; -1 if if the special file is
inaccessible or does not have a mounted file system, or if there are
active files in the mounted file system.
(mount = 21.)
sys mount; special; name; rwflag
(umount = 22.)
sys umount; special