SAS Functions and CALL Routines under Windows

FOPTNAME Function: Windows

Returns the name of an information item for an external file.

Category:	External Files
Windows specifics:	available information items
See:	FOPTNAME Function in SAS Language Reference: Dictionary

Syntax
Details
Example: File Attributes When Using the Pipe Device Type

Syntax

FOPTNAME(file-id, nval)

file-id

specifies the identifier that was assigned when the file was opened, generally by the FOPEN function.

nval

specifies the number of the file information item to be retrieved. The following table shows the values that nval can have for single and concatenated files under Windows operating environments.

nval	Single File	Pipe Files	Concatenated Files
1	Filename	Unnamed pipe access device	Filename
2	RECFM	PROCESS	RECFM
3	LRECL	RECFM	LRECL
4		LRECL

Details

FOPTNAME returns a blank if an error occurred.

Example: File Attributes When Using the Pipe Device Type

The following example creates a data set that contains the name and value attributes that are returned by the FOPTNAME function when you are using pipes:

data fileatt;
   filename mypipe pipe 'dir';
   fid=fopen("mypipe","s");
   /* fid should be non--zero. 0 indicates failure */
   put "File id is: " fid=;
   numopts=foptnum(fid);
   put "Number of information items should be 4; " numopts=;
   do i=1 to numopts;
      optname=foptname(fid,i);
      put i= optname=;
      optval=finfo(fid,optname);
      put optval=;
   end;

rc=fclose(fid);
run;

The SAS LOG Displays Pipe File Information

NOTE: PROCEDURE PRINTTO used (Total process time):
      real time           0.03 seconds
      cpu time            0.01 seconds
      
6    data fileatt;
7       filename mypipe pipe 'dir';
8       fid=fopen("mypipe","s");
9       /* fid should be non-zero. 0 indicates failure */
10      put "File id is: " fid=;
11      numopts=foptnum(fid);
12      put "Number of information items should be 4; " numopts=;
13      do i=1 to numopts;
14         optname=foptname(fid,i);
15         put i= optname=;
16         optval=finfo(fid,optname);
17         put optval=;
18      end;
19   
20   rc=fclose(fid);
21   run;
File id is: fid=1
Number of information items should be 4; numopts=4
i=1 optname=Unnamed Pipe Access Device
optval= 
i=2 optname=PROCESS
optval=dir
i=3 optname=RECFM
optval=V
i=4 optname=LRECL
optval=256
NOTE: The data set WORK.FILEATT has 1 observations and 6 variables.
NOTE: DATA statement used (Total process time):
      real time           9.64 seconds
      cpu time            1.16 seconds
      
22   proc printto; run;

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