3.  Record Types  

      Several procedures return their results as Scheme records. All record types defined by the UNIX extension are stored in variables with names of the form <something>-record (such as system-record or passwd-record). In addition, a type predicate, a record constructor, and accessor functions for all record fields are defined for each record type. For example, a system record type with the fields hostname, sysname, and osname is defined, resulting in variable system-record holding the record type descriptor, and the functions 

(system-record? obj)
(make-system-record)
(system-hostname system-record)
(system-sysname system-record)
(system-osname system-record)
Use define-record-modifiers if you need the modifier functions for any of the records as well (see the record extension reference manual for details).

The following record types are defined by the UNIX extension: 

+------------+--------------------------------------------------------+
|Record Type |                         Fields                         |
+------------+--------------------------------------------------------+
+------------+--------------------------------------------------------+
|stat        | type mode ino dev nlink uid gid size atime mtime ctime |
+------------+--------------------------------------------------------+
|time        | seconds minutes hours day-of-month month year weekday  |
|            | day-of-year dst                                        |
+------------+--------------------------------------------------------+
|nanotime    | nanoseconds minuteswest dst                            |
+------------+--------------------------------------------------------+
|system      | hostname sysname osname                                |
+------------+--------------------------------------------------------+
|passwd      | name password uid gid gecos homedir shell              |
+------------+--------------------------------------------------------+
|group       | name password gid members                              |
+------------+--------------------------------------------------------+
|resources   | user-time system-time (...)                            |
+------------+--------------------------------------------------------+
|lock        | exclusive? whence start length                         |
+------------+--------------------------------------------------------+
|wait        | pid status code core-dump? resources                   |
+------------+--------------------------------------------------------+

Markup created by unroff 1.0,    September 24, 1996,    net@informatik.uni-bremen.de