critical impact:

fcntl - some functional differences (CrCh195)

Problem description

The fcntl routine on Tru64 UNIX and HP-UX are compatible with the exception of some AdvFS-specific and other miscellaneous request parameters.

The following are the request parameters specific to Tru64 UNIX:

• F_GETTIMES retrieves the current times for the file identified by filedes.

• F_SETTIMES sets the current times for the file identified by filedes.

For the F_GETTIMES and F_SETTIMES requests, the function's third argument is a pointer to the attr_timbuf structure that is not defined on HP-UX and that contains the file's atime (access time), mtime (modification time), and ctime (file attribute change time) values.

The following AdvFS file system request parameters are specific to Tru64 UNIX:

• F_ADVFS_OP performs AdvFS-specific operations on AdvFS files. The value expects that the argument parameter is a pointer to a advfs_opT structure that is not defined on HP-UX.

• F_GETCACHEPOLICY gets the cache policy for the file, which is either direct I/O or caching.

• F_GETMAP gets the sparseness map of the file referred to by the fildes parameter. The argument parameter, taken as a pointer to type struct extentmap (not defined on HP-UX), is filled in with data that describes the extent map of the file.

• F_RSETLK and F_RSETLKW is reserved for use by the network lock daemon (rpc.lockd(8)) on NFS servers to acquire locks requested by F_SETLK on NFS clients.

• F_RGETLK is reserved for use by the network lock daemon (rpc.lockd(8)) on NFS servers to acquire locks requested by F_SETLK on NFS clients.

• F_CNVT is used by the network lock daemon (rpc.lockd(8)) to communicate with the NFS server kernel to handle locks on the NFS files.

Identifiers

F_ADVFS_OP	F_GETMAP	F_RSETLK
F_CNVT	F_GETTIMES	F_RSETLKW
F_GETCACHEPOLICY	F_RGETLK	F_SETTIMES

See also

• Background information on Input/Output (files, devices) impacts
• fcntl(2)

Solution description

You might use the fstat function to replace F_GETTIMES and use the utimes function for F_SETTIMES as a temporary solution. Comment out all of the AdvFS-specific code.

F_RSETLK, F_CNVT, F_RGETLK, and F_RSETLKW are meant for internal use only, and the locks are remote. You should change any use of these if they are in your code.

See also

• fcntl(2)

Problem summary