| Record position within a file |
Record position is shared between
programs. |
Record position is independent between
programs. |
| close statement
(implemented as COBOL CLOSE statement) |
Virtual or absolute depending on
whether the file was already open when the program was started. |
Absolute CLOSE of a file. Record
position is lost. (Poor performer) |
| First use of an EGL file I/O statement
on each file (implemented in part as COBOL OPEN statement with INPUT,
OUTPUT, or INPUT-OUTPUT phrases, depending on the use of other I/O
statements for the same file in the program) |
- Must be done in each program that uses the file.
- Run time hard error if the OPEN phrase is not compatible with
the file open type of the program that actually opened the file. (If
you are running in V6.0 compatibility mode and vgVar.handleHardIOErrors is
1, then program logic handles the error; if vgVar.handleHardIOErrors is
not set to 1, then the program ends).
|
- Must be done in each program that uses the file.
- File OPEN phrases are independent in each program, so they do
not have to conform to each other.
|
| Anytime a program ends |
- For a main EGL run unit program, all files in the run unit are
closed, but the effect is virtual or absolute depending on whether
the file was already open when the program was started.
- For a called EGL program, the file is kept open, and the record
position is saved, if the program is restarted in the current EGL
run unit.
- Files within a library are left open until the main program terminates,
which means you can perform file I/O within a single library, but
called from many EGL sources, such as other libraries, main or called
programs.
|
- For a main EGL run unit program, all files in the run unit are
closed, and the effect is absolute.
- For an EGL library or called EGL program, the file is kept open,
and the record position is saved, if the program is restarted in the
current EGL run unit.
|