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.help zstttx May84 "System Interface"
.ih
NAME
zstttx -- get file status for a text file
.ih
SYNOPSIS
.nf
zstttx (chan, param, lvalue)
int chan # OS channel assigned to file
int param # magic code for parameter
long lvalue # return value of parameter
.fi
.ih
DESCRIPTION
The \fBzstttx\fR primitive is used to obtain file, device, and machine
dependent information for the text file (and device) connected to the
channel \fIchan\fR. The magic integer \fIparam\fR selects the parameter
to be returned; a separate call is required to access each parameter.
.ls
.ls FSTT_BLKSIZE (=1)
Not used for text files; return value is undefined (but must be >= 0).
.le
.ls FSTT_FILSIZE (=2)
The current file size in machine bytes, possibly including space for record
headers. This parameter is purely informative and must not be used to
direct the flow of control, since the current file size is not a well defined
quantity for a text file.
.le
.ls FSTT_OPTBUFSIZE (=3)
The optimum, i.e. default, buffer size for a FIO text file line buffer.
Normally the same as SZ_LINE.
.le
.ls FSTT_MAXBUFSIZE (=4)
The maximum buffer size for a FIO text file line buffer.
Normally the maximum record size for the output device.
If there is no maximum value zero is returned.
.le
.le
.ih
RETURN VALUE
ERR is returned (coerced into a long integer) if \fIchan\fR or \fIparam\fR
is illegal. The legal \fIlvalues\fR are all nonnegative integer values.
.ih
NOTES
The file size is meaningless if the file is a terminal.
.ih
SEE ALSO
zfiotx
.endhelp
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