/* BEGIN INCLUDE FILE dm_cm_file_header.incl.pl1 */ /* DESCRIPTION: This include file contains the cm_file_header and collection_id_table structure. These structures are stored as elements in the Header Collection of a file and contain per-file, as opposed to per-collection, information. The cm_file_header structure is always stored in the element whose identifier is CM_FILE_HEADER_ELEMENT_ID, declared in dm_cm_hdr_col_ids.incl.pl1. The collection_id_table is an array of identifiers of each collection in the file, excepting the Header Collection. The identifier of a collection is the same as the identifier of the element which holds that collection's collection_header, described in dm_cm_collection_header.incl.pl1. The identifier of the element in which the collection_id_table is stored is cm_file_header.collection_id_table_element_id. A file also has a reservation map for determining which controls intervals have been reserved by a collection. It is divided into several blocks, or fragments. The file_reservation_map is actually an array of element identifiers of the fragments of the map. The file_reservation_map is stored in the element whose identifier is cm_file_header.allocation_map_element_id (quite a misnomer). The number of fragments of the map is cm_file_header.number_of_blocks. The size of each is fragment is cm_file_header.number_of_control_intervals_per_block bits long, representing equally as many control intervals. The file_reservation_map is described in dm_cm_reservation_map.incl.pl1. cm_file_header.highest_numbered_ci is the number of the control interval in the file with the highest control interval number. It is not yet used or maintained. */ /* HISTORY: Written by Matthew Pierret, 03/23/82. Modified: 04/08/82 by Matthew Pierret: Removed storage method constants. 05/18/82 by Matthew Pierret: Made the array of collections an array of element ids referring to collection_header's. Reduced buffer length to 120, enough bytes to hold the collmgr_header with 25 collection header element ids. 06/03/82 by Matthew Pierret: Added collmgr_header_header. 07/01/82 by Matthew Pierret: Removed collmgr_header_header. Changed to version A made fixed length, split off array of collection_ids (also known as element_ids of collection_headers). 10/29/82 by Matthew Pierret: Changed from collmgr_header to cm_file_header. 09/18/84 by Matthew Pierret: Added DESCRIPTION section. Moved constants to dm_cm_hdr_col_ids.incl.pl1. */ /* format: style2,ind3,ll79 */ dcl 1 cm_file_header aligned based (cm_file_header_ptr), 2 version char (8), 2 highest_numbered_ci fixed bin (24) uns, 2 number_of_collections fixed bin (17) unal, 2 number_of_blocks fixed bin (17) unal, 2 number_of_control_intervals_per_block fixed bin (17), 2 allocation_map_element_id bit (36) aligned, 2 collection_id_table_element_id bit (36) aligned; dcl cm_file_header_ptr ptr; dcl CM_FILE_HEADER_VERSION_1 char (8) aligned init ("cm_fhdr1") int static options (constant); dcl collection_id_table (cit_number_of_collections) bit (36) aligned based (collection_id_table_ptr); dcl collection_id_table_ptr ptr; dcl cit_number_of_collections fixed bin (17); /* ----------End include file dm_cm_file_header.incl.pl1---------- */ */ ----------------------------------------------------------- Historical Background This edition of the Multics software materials and documentation is provided and donated to Massachusetts Institute of Technology by Group Bull including Bull HN Information Systems Inc. as a contribution to computer science knowledge. This donation is made also to give evidence of the common contributions of Massachusetts Institute of Technology, Bell Laboratories, General Electric, Honeywell Information Systems Inc., Honeywell Bull Inc., Groupe Bull and Bull HN Information Systems Inc. to the development of this operating system. Multics development was initiated by Massachusetts Institute of Technology Project MAC (1963-1970), renamed the MIT Laboratory for Computer Science and Artificial Intelligence in the mid 1970s, under the leadership of Professor Fernando Jose Corbato. Users consider that Multics provided the best software architecture for managing computer hardware properly and for executing programs. Many subsequent operating systems incorporated Multics principles. Multics was distributed in 1975 to 2000 by Group Bull in Europe , and in the U.S. by Bull HN Information Systems Inc., as successor in interest by change in name only to Honeywell Bull Inc. and Honeywell Information Systems Inc. . ----------------------------------------------------------- Permission to use, copy, modify, and distribute these programs and their documentation for any purpose and without fee is hereby granted,provided that the below copyright notice and historical background appear in all copies and that both the copyright notice and historical background and this permission notice appear in supporting documentation, and that the names of MIT, HIS, Bull or Bull HN not be used in advertising or publicity pertaining to distribution of the programs without specific prior written permission. Copyright 1972 by Massachusetts Institute of Technology and Honeywell Information Systems Inc. Copyright 2006 by Bull HN Information Systems Inc. Copyright 2006 by Bull SAS All Rights Reserved */