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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <config.h>
include <syserr.h>
include <fio.h>
# FWATIO -- Wait for i/o to complete on the file buffer, update file
# buffer pointers.
procedure fwatio (fd)
int fd
int nchars, bufmode
int await()
errchk filerr
include <fio.com>
begin
fp = fiodes[fd]
if (FBUFMODE(fp) == INACTIVE)
return
else {
nchars = await (fd)
# Set the buffer mode flag to inactive regardless of the status
# returned by await.
bufmode = FBUFMODE(fp)
FBUFMODE(fp) = INACTIVE
if (bufmode == READ_IN_PROGRESS) {
if (nchars == ERR)
call filerr (FNAME(fp), SYS_FREAD)
else
itop[fd] = bufptr[fd] + nchars
} else if (nchars == ERR) {
# If an i/o error occurs on a write invalidate the buffer
# else during error recovery close will try again to write
# the data, probably causing another error.
otop[fd] = bufptr[fd]
call filerr (FNAME(fp), SYS_FWRITE)
}
otop[fd] = bufptr[fd]
}
end
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