Internet Assigned Numbers Authority

                                                         Operating System Specific Parameters

   Created
   2003-10-31

   Last Updated
   2024-06-11

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   Registries included below

     • OS Specific Fact Names
     • OS Specific Filetypes

OS Specific Fact Names

   Registration Procedure(s)

 First Come First Served

   Reference
   [RFC3659]

   Available Formats
   [IMG]
   CSV

                            Definition
           OS Specific Fact   of the
   OS Name       Name       Syntax of                                    Specification of Semantics                                     Reference
                             the Fact
                              Value
                                       From IEEE Std 1003.1-2004 XBD 4.7 "File Times Update"
                                       [http://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap04.html#tag_04_07]: "st_ctime
                                       is associated with the times that the file status is changed."
                            "time-val"
    Unix   Unix.ctime       from       This is clarified in the operations described throughout IEEE Std 1003.1-2004 XSH 3 "System    [Paul_Millar]
                            [RFC3659]  Interfaces."

                                       Although IEEE Std 1003.1-2004 only considers st_ctime as having second resolution,
                                       platform-specific extensions exist that provide st_ctime semantics but with sub-second
                                       resolution. Unix.ctime values from such platforms MAY use such finer-grain resolution.
                                       From IEEE Std 1003.1-2004 XBD 4.7 "File Times Update"
                                       [http://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap04.html#tag_04_07]: "The
                                       st_atime field is associated with the times that the file data is accessed."

                                       This is clarified in the operations described throughout IEEE Std 1003.1-2004 XSH 3 "System
                            "time-val" Interfaces."
    Unix   Unix.atime       from                                                                                                      [Paul_Millar]
                            [RFC3659]  Although IEEE Std 1003.1-2004 only considers st_atime as having second resolution,
                                       platform-specific extensions exist that provide st_atime semantics but with sub-second
                                       resolution. Unix.atime values from such platforms MAY use such finer-grain resolution.

                                       For performance reasons, some platforms allow operations to delay or suppress updates to
                                       st_atime. FTP servers on such platforms MAY refrain from publishing the Unix.atime fact.
                            "1*RCHAR"
    Unix   Unix.ownername   from       File owner name, as mapped from the numeric owner ID, by the operating system.                 [TJ_Saunders]
                            [RFC3659]
                            "1*RCHAR"
    Unix   Unix.groupname   from       File group name, as mapped from the numeric group ID, by the operating system.                 [TJ_Saunders]
                            [RFC3659]

OS Specific Filetypes

   Registration Procedure(s)

 First Come First Served

   Reference
   [RFC3659][RFC Errata 6252]

   Available Formats
   [IMG]
   CSV

   OS Name OS Specific File Type  Definition of the Syntax of the Fact     Specification of Semantics                    Reference
                                                 Value
    UNIX   fifo                  N/A                                    FIFO special file (S_IFIFO)      [Single Unix Specification][Simon_Kissane]
    UNIX   slink                 N/A                                    Symbolic link (S_IFLNK)          [Single Unix Specification][Simon_Kissane]
    UNIX   socket                N/A                                    Socket (S_IFSOCK)                [Single Unix Specification][Simon_Kissane]
    UNIX   blk                   N/A                                    Block special file (S_IFBLK)     [Single Unix Specification][Simon_Kissane]
    UNIX   chr                   N/A                                    Character special file (S_IFCHR) [Single Unix Specification][Simon_Kissane]

                                                                 Contact Information

         ID            Name             Contact URI         Last Updated
   [Paul_Millar]   Paul Millar   mailto:paul.millar&desy.de 2014-03-20
   [Simon_Kissane] Simon Kissane mailto:skissane&gmail.com  2020-08-12
   [TJ_Saunders]   TJ Saunders   mailto:tj&castaglia.org    2016-11-15

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