Open System Services System Calls Reference Manual (G06.29+, H06.08+, J06.03+)

System Functions (n - p) PUT_FILE_OPEN_(2)
G 1 Member of owner’s group
(local)
A 0 Any user (local)
For a given access mode, the accessor’s security level is checked against the file
security level. File access is allowed or not allowed as shown in the following
table. In this table, file security levels are indicated by FUP security codes. For
a given accessor security level, a Y indicates that access is allowed to a file with
the security level shown; an X indicates that access is not allowed.
Table 5−2. Allowed Guardian File Accesses
Accessor’s Security Level File Security Level
-UCNOGA
_______________________________________________
_______________________________________________
Super ID user, local access YYYYYYY
Super ID user, remote access XYYYXXX
Owner or owner’s group manager,
remote access
XYYYXXX
Member of owner’s group, remote
access
XXYYXXX
Any other user, remote access XXXYXXX
Owner or owner’s group manager,
local access
XYYYYYY
Member of owner’s group, local
access
XXYYXYY
Any other user, local access XXXYXXY
If the caller to PUT_FILE_OPEN_() fails the security check, the open fails
with an error 48. You can obtain the security level of a file by a call to the Guar-
dian FILE_GETINFOLIST[BYNAME]_ procedure, the FILEINFO procedure, or
by the File Utility Program (FUP) INFO command.
If you are using the Safeguard product, this security information might not apply.
Tape file open access mode
The file system does not enforce read-only or write-only access for unlabeled
tape, even though no error is returned if you specify one of these access modes
when opening a tape file.
File open exclusion and access mode checking
When a file open is attempted, the requested access and exclusion modes are
compared with those of any opens already granted for the file. If the attempted
open is in conflict with other opens, the open fails with error 12. For a table that
lists the possible current modes and requested modes, indicating whether an
open succeeds or fails, see the description of the FILE_OPEN_ procedure in the
Guardian Proc edure Calls Reference Manual. For the Optical Storage Facility
only, the "process exclusive" exclusion mode is also supported. Process
exclusive is the same as exclusive for opens by other processes, but the same as
shared for opens by the same process.
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