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

mkfifo(3) OSS Library Calls Reference Manual
For more information about ACLs, see the acl(5) reference page.
Use on Guardian Objects
Attempting to create a FIFO within the Guardian file system (that is, within G) fails with errno
set to [EINVAL].
Accessing Files in Restricted-Access Filesets
When accessing a file in a restricted-access fileset, the super ID (255,255 in the Guardian
environment, 65535 in the OSS environment) is restricted by the same file permissions and
owner privileges as any other user ID: It has no special privileges unless the executable file
started by the super ID has the PRIVSETID file privilege. In this case, the process started by the
super ID can switch to another ID and then access files in restricted-access filesets as that ID.
Executable files that have the PRIVSOARFOPEN privilege and that are started by a member of
the Safeguard SECURITY-OSS-ADMINISTRATOR (SOA) group have the appropriate privilege
to use this function on any file in a restricted-access fileset. However, Network File System
(NFS) clients are not granted SOA group privileges, even if these clients are accessing the sys-
tem with a user ID that is a member of the SOA security group.
For more information about restricted-access filesets and file privileges, see the Open System Ser-
vices Management and Operations Guide.
Use From the Guardian Environment
The mkfifo( ) function is one of a set of functions that have the following effects when the first of
them is called from the Guardian environment:
• Two Guardian file system file numbers (not necessarily the next two available) are allo-
cated for the root directory and the current working directory. These file numbers cannot
be closed by calling the Guardian FILE_CLOSE_ procedure.
• The current working directory is assigned from the VOLUME attribute of the Guardian
environment =_DEFAULTS DEFINE.
• The use of static memory by the process increases slightly.
These effects occur only when the first of the set of functions is called. The effects are not cumu-
lative.
NOTES
On systems running H06.24 or later H-series RVUs or J06.13 or later J-series RVUs, you can use |
this function with 32-bit or 64-bit OSS applications.
RETURN VALUES
Upon successful completion of mkfifo( ), the value 0 (zero) is returned. Otherwise, the value -1 is
returned and errno is set to indicate the error.
ERRORS
If any of the following conditions occurs, the new file is not created and the mkfifo( ) function
sets errno to the corresponding value:
[EACCES] A component of the pathname prefix denies search (execute) permission, or write
permission is denied on the parent directory of the FIFO to be created.
[EEXIST] The named file exists.
[EFSBAD] The fileset catalog for one of the filesets involved in the operation is corrupt.
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