Opens an existing file for byte-stream operations.
Syntax:
call "CBL_OPEN_FILE" using filename
access-mode
deny-mode
device
file-handle
Parameters:
| |
Using call prototype (see
Key)
|
Picture
|
|
filename
|
pic x(n).
|
pic x(n).
|
|
access-mode
|
cblt-x1-compx.
|
pic x comp-x.
|
|
deny-mode
|
cblt-x1-compx.
|
pic x comp-x.
|
|
device
|
cblt-x1-compx.
|
pic x comp-x.
|
|
file-handle
|
cblt-bytestream-handle.
|
pic x(4) comp-5.
|
On Entry:
-
filename
- Space- or null-terminated filename of the file to be opened. You can use spacey filenames if you put double quotation marks around them. You can use embedded environment variables and library names in
filename; for more information see the chapter
Filenames in yourFile Handling book.
-
access-mode
- Defines access mode:
| 1
|
Read only
|
| 2
|
Write only (deny-mode must be 0)
|
| 3
|
Read/write
|
| 64
|
Read/write files greater than 4Gb
|
-
deny-mode
- Defines deny mode:
| 0
|
Deny both read and write (exclusive)
|
| 1
|
Deny write
|
| 2
|
Deny read
|
| 3
|
Deny neither read nor write
|
-
device
- Reserved for future use (must be 0).
On Exit:
-
file-handle
- Returns a file handle for a successful open.
Comments:
The success of the call can be checked by examining RETURN-CODE.
If you are requesting 64-bit file access to an unknown remote file system, ensure you set the remote_64bit_access tunable.