Open System Services System Calls Reference Manual (G06.28+, H06.05+)

creat(2) OSS System Calls Reference Manual
File Type Flags
The file type flags that can be logically ORed into the value specified in the mode parameter are:
S_IFREG Regular file in the OSS file system or in /G, the Guardian file system.
S_ISVTX Sticky bit; used only for directories (cannot be used for files in /G, the Guardian
file system).
Access Control Lists (ACLs)
The creat() function does not change the ACL for an existing file. For more information about |
ACLs for existing files, see the acl(2), chmod(2), and acl(5) reference pages. |
For more information about ACLs, including ACL inheritance for newly created files, see the |
acl(5) reference page.
Opening Guardian Files
If the file is a Guardian file (that is, a file in the /G file system), these rules apply:
• The file can be opened only if it is one of these:
— An odd, unstructured Enscribe file. In this case, it is opened as a regular file with
a primary and secondary extent size that is a multiple of 2. If the extent size is
odd, the open fails.
If the unstructured buffer size was not 4096, a successful open makes the buffer
size 4096 (as if the Guardian procedure SETMODE was called for mode 93 with
a parameter value of 4096).
— An EDIT file (file code 101). In this case, it is opened as a regular file for read-
only access.
— A tty simulation process.
An attempt to open any file (or device) of any other type fails, and errno is set to the
value of [EINVAL].
An attempt to open any file on a logical disk volume (virtual disk) administered through |
the Storage Management Foundation (SMF) fails, and errno is set to the value of |
[ENOTSUP].
An attempt to open a volume, subvolume, or process (/G/vol, /G/vol/subvol,or
/G/process, respectively) fails, and errno is set to the value of [EISDIR].
• An attempt to open a subvolume with a reserved name beginning with "ZYQ" (for exam-
ple, /G/vol2/zyq00004) fails, and errno is set to the value of [EACCES].
• An attempt to open a file within a subvolume with a reserved name beginning with
"ZYQ" (for example, /G/vol2/zyq00004/z000002x) fails, and errno is set to the value of
[EACCES].
• If the file is not an EDIT file (that is, the file code is not 101), it is opened in shared
exclusion mode.
• If the file is an EDIT file and read-only access is specified, the file is opened in protected
exclusion mode in the Guardian environment.
1−40 Hewlett-Packard Company 527186-007