vwrite \- write (virtually) to file
\fBvwrite(filedes, buffer, nbytes)\fR
system call is used in conjunction with
to perform efficient updating of large files.
and updating of the data in the buffer which was given to
of the same buffer to the same
at the same offset in the file
will cause data which has been modified since it was
to) the file to be returned to the file.
Returns \-1 on error: bad descriptor, buffer address, count or alignment
as well as on physical I/O errors.
is defined only when no other
since the one matching the