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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | .help zawtbf May84 "System Interface"
.ih
NAME
zawtbf -- wait for an asynchronous i/o transfer to complete
.ih
SYNOPSIS
.nf
zawtbf (chan, status)
int chan # OS channel assigned to file
int status # number of bytes read or written
.fi
.ih
DESCRIPTION
If a transfer is in progress on the channel \fIchan\fR, process execution
is suspended until the transfer completes. If the channel is inactive
control returns immediately.
.ih
RETURN VALUE
ERR is returned if an i/o error occurred during the last transfer.
If the transfer was successful the number of bytes read or written is
returned. A read at EOF returns a status value of zero.
Repeated calls to \fBzawtbf\fR following a single i/o request continue
to return the same value.
.ih
NOTES
FIO guarantees that \fBzawtbf\fR will be called after every asynchronous
i/o transfer and that only a single i/o request will be posted to a channel
at a time. If an i/o error occurs on the channel it should be cleared by
the next request, i.e., errors should not "stick".
.ih
SEE ALSO
zardbf, zawrbf, zfiobf
.endhelp
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