COMPILATION LISTING OF SEGMENT apl_erase_command_ Compiled by: Multics PL/I Compiler, Release 28d, of October 4, 1983 Compiled at: Honeywell LCPD Phoenix, System M Compiled on: 11/29/83 1604.9 mst Tue Options: optimize map 1 /* ****************************************************** 2* * * 3* * * 4* * Copyright (c) 1972 by Massachusetts Institute of * 5* * Technology and Honeywell Information Systems, Inc. * 6* * * 7* * * 8* ****************************************************** */ 9 10 /* format: style3 */ 11 apl_erase_command_: 12 proc (nargs, arglist); 13 14 /* 15* * this routine executes the )ERASE apl command 16* * written 73.9.06 by DAM 17* * Modified 740131 by PG to check for SI DAMAGE 18* Modified 800116 by PG to stop calling apl_system_error_ for SI DAMAGE report 19* because it unwinds & leaves the save frame on the SI, leading to system errors 20* later on. 21* */ 22 23 /* parameters */ 24 25 dcl nargs fixed bin parameter, 26 arglist dim (*) char (*) parameter; 27 28 /* automatic */ 29 30 declare argno fixed bin, 31 code fixed bin (35), 32 not_erased_msg char (150) varying aligned, 33 symb ptr unaligned; 34 35 /* builtins */ 36 37 declare (addr, addrel, length, maxlength, null, rtrim) 38 builtin; 39 40 /* entries */ 41 42 dcl apl_create_save_frame_ 43 entry, 44 apl_destroy_save_frame_update_ 45 entry, 46 apl_get_symbol_ entry (char (*), unaligned pointer, fixed bin), 47 apl_free_bead_ entry (unaligned pointer), 48 apl_pendant_function_check_ 49 entry (unaligned pointer) returns (bit (1) aligned), 50 iox_$put_chars entry (ptr, ptr, fixed bin (21), fixed bin (35)); 51 52 /* external static */ 53 54 declare apl_static_$apl_output 55 ptr external static; 56 57 /* internal static */ 58 59 declare NL char (1) init (" 60 ") internal static; 61 62 /* include files */ 63 1 1 /* ====== BEGIN INCLUDE SEGMENT apl_bead_format.incl.pl1 ================================== */ 1 2 1 3 declare 1 general_bead aligned based, /* The Venerable Bead */ 1 4 2 type unaligned, 1 5 3 bead_type unaligned, 1 6 4 operator bit (1), /* ON if operator bead */ 1 7 4 symbol bit (1), /* ON if symbol bead */ 1 8 4 value bit (1), /* ON if value bead */ 1 9 4 function bit (1), /* ON if function bead */ 1 10 4 group bit (1), /* ON if group bead */ 1 11 4 label bit (1), /* ON if label bead */ 1 12 4 shared_variable bit (1), /* ON if shared variable bead */ 1 13 4 lexed_function bit (1), /* ON if lexed function bead */ 1 14 3 data_type unaligned, 1 15 4 list_value bit (1), /* ON if a list value bead */ 1 16 4 character_value bit (1), /* ON if a character value bead */ 1 17 4 numeric_value bit (1), /* ON if a numeric value bead */ 1 18 4 integral_value bit (1), /* ON if an integral value bead */ 1 19 4 zero_or_one_value bit (1), /* ON if a boolean value bead */ 1 20 4 complex_value bit (1), /* ON if a complex, numeric value bead */ 1 21 3 unused_bits bit (4) unaligned, /* pad to 18 bits (for future use) */ 1 22 2 size bit (18) unaligned, /* Number of words this bead occupies 1 23* (used by bead storage manager) */ 1 24 2 reference_count fixed binary (29); /* Number of pointers which point 1 25* to this bead (used by bead manager) */ 1 26 1 27 1 28 /* constant strings for initing type field in various beads */ 1 29 1 30 declare ( 1 31 operator_type init("100000000000000000"b), 1 32 symbol_type init("010000000000000000"b), 1 33 value_type init("001000000000000000"b), 1 34 function_type init("000100000000000000"b), 1 35 group_type init("000010000000000000"b), 1 36 label_type init("001001000011000000"b), 1 37 shared_variable_type init("001000100000000000"b), 1 38 lexed_function_type init("000000010000000000"b), 1 39 1 40 list_value_type init("000000001000000000"b), 1 41 character_value_type init("001000000100000000"b), 1 42 numeric_value_type init("001000000010000000"b), 1 43 integral_value_type init("001000000011000000"b), 1 44 zero_or_one_value_type init("001000000011100000"b), 1 45 complex_value_type init("001000000000010000"b), 1 46 1 47 not_integer_mask init("111111111110011111"b), /* to clear integral, zero_or_one bits */ 1 48 not_zero_or_one_mask init("111111111111011111"b) /* to clear zero_or_one bit */ 1 49 ) bit(18) internal static; 1 50 1 51 /* ------ END INCLUDE SEGMENT apl_bead_format.incl.pl1 ---------------------------------- */ 64 2 1 /* BEGIN INCLUDE FILE: apl_group_bead.incl.pl1 */ 2 2 2 3 /* Initial Version: 1973.06.18 2 4* Typed in by: Richard S. Lamson */ 2 5 2 6 2 7 declare 1 group_bead aligned based, /* Group: bead_type.group = "1"b */ 2 8 2 9 2 header aligned like general_bead, 2 10 2 11 2 number_of_members fixed binary, 2 12 2 13 2 member pointer unaligned dimension (0 refer (group_bead.number_of_members)); 2 14 /* Pointer to the symbol bead for each 2 15* member of the group */ 2 16 2 17 /* END INCLUDE FILE apl_group_bead.incl.pl1 */ 65 3 1 /* ====== BEGIN INCLUDE SEGMENT apl_symbol_bead.incl.pl1 ================================== */ 3 2 3 3 /* Explanation of fields: 3 4* symbol_bead.hash_link_pointer points to next symbol in same hash bucket in the symbol table. 3 5* symbol_bead.meaning_pointer points to current "value" of this name: 3 6* = null => unused (e.g. undefined variable) 3 7* -> group bead => group name 3 8* -> value bead => variable with a value 3 9* -> function bead => function name 3 10* -> label bead => localized label value 3 11* -> shared var bead => shared variable */ 3 12 3 13 declare 1 symbol_bead aligned based, 3 14 2 header aligned like general_bead, 3 15 2 hash_link_pointer pointer unaligned, 3 16 2 meaning_pointer pointer unaligned, 3 17 2 name_length fixed binary, 3 18 2 name character (0 refer (symbol_bead.name_length)) unaligned; 3 19 3 20 /* ------ END INCLUDE SEGMENT apl_symbol_bead.incl.pl1 ---------------------------------- */ 66 4 1 /* ====== BEGIN INCLUDE SEGMENT apl_ws_info.incl.pl1 ====================================== */ 4 2 4 3 /* This structure contains all of the global data (or pointers to it) for the APL subsystem */ 4 4 4 5 /* automatic */ 4 6 4 7 declare ws_info_ptr ptr initial (apl_static_$ws_info_ptr.static_ws_info_ptr); 4 8 4 9 /* external static */ 4 10 4 11 declare 1 apl_static_$ws_info_ptr external static aligned structure, 4 12 2 static_ws_info_ptr unaligned pointer; 4 13 4 14 /* based */ 4 15 4 16 declare 1 ws_info aligned based (ws_info_ptr), 4 17 2 version_number fixed bin, /* version of this structure (3) */ 4 18 2 switches unaligned, /* mainly ws parameters */ 4 19 3 long_error_mode bit, /* if 1, long Multics format, else APL/360 format */ 4 20 3 debug_mode bit, /* if 1, system error causes escape to command level */ 4 21 3 canonicalize_mode bit, /* if 1, the editor canonicalizes user input */ 4 22 3 restrict_exec_command bit, /* if 1, the )EXEC command may not be used */ 4 23 3 restrict_debug_command bit, /* if 1, the )DEBUG command may not be used */ 4 24 3 restrict_external_functions 4 25 bit, /* if 1, the )ZFN, )MFN, and )DFN commands may not be used */ 4 26 3 restrict_load bit, /* if 1, the )LOAD and )COPY commands may not be used */ 4 27 3 restrict_load_directory bit, /* if 1, no directory allowed in )LOAD or )COPY pathnames */ 4 28 3 restrict_save bit, /* if 1, the )SAVE command may not be used */ 4 29 3 restrict_save_directory bit, /* if 1, no directory allowed in )SAVE pathnames */ 4 30 3 off_hold bit, /* if 1, )OFF HOLD was typed, else just )OFF */ 4 31 3 transparent_to_signals bit, /* if 1, any conditions slip right past APL */ 4 32 3 meter_mode bit, /* if 1, metering may be done, else speed is all-important */ 4 33 3 restrict_msg_command bit, /* if 1, the )MSG command may not be used. */ 4 34 3 compatibility_check_mode 4 35 bit, /* if 1, check for incompatible operators */ 4 36 3 no_quit_handler bit, /* if 1, do not trap QUITs. */ 4 37 /* remaining 20 bits not presently used */ 4 38 4 39 2 values, /* attributes of the workspace */ 4 40 3 digits fixed bin, /* number of digits of precision printed on output */ 4 41 3 width fixed bin, /* line length for formatted output */ 4 42 3 index_origin fixed bin, /* the index origin (0 or 1) */ 4 43 3 random_link fixed bin(35), /* seed for random number generator */ 4 44 3 fuzz float, /* comparison tolerance (relative fuzz) */ 4 45 3 float_index_origin float, /* the index origin in floating point */ 4 46 3 number_of_symbols fixed bin, /* the number of symbol_beads currently in existence */ 4 47 3 maximum_value_stack_size 4 48 fixed bin (18), /* maximum number of words in one segment of value stack */ 4 49 4 50 2 pointers, /* pointers to various internal tables */ 4 51 3 symbol_table_ptr unaligned pointer, /* -> symbol_table (apl_symbol_table.incl.pl1) */ 4 52 3 current_parse_frame_ptr unaligned pointer, /* -> topmost parse frame */ 4 53 3 value_stack_ptr unaligned pointer, /* -> next free location on value stack */ 4 54 3 alloc_free_info_ptr unaligned pointer, /* -> apl_storage_mngr_ data (apl_storage_system_data.incl.pl1) */ 4 55 4 56 2 time_invoked fixed bin(71), /* clock time that APL was entered */ 4 57 2 integer_fuzz float, /* the absolute fuzz used in checking for integers */ 4 58 2 user_number fixed bin(35), /* number under which the user is signed on */ 4 59 2 latent_expression unaligned pointer, /* -> value_bead for QuadLX */ 4 60 2 lock char(32), /* the lock currently set on this workspace (password) */ 4 61 2 wsid char(100), /* the workspace identification: name, number name, or clear ws */ 4 62 2 last_error_code fixed bin(35), /* last code passed to apl_error_ */ 4 63 2 signoff_lock character (32), 4 64 4 65 2 interrupt_info aligned, /* bits used by apl_interpreter_ to tell when to abort */ 4 66 3 dont_interrupt_parse bit, /* if 1, don't do a dirty stop because the parser is running */ 4 67 3 dont_interrupt_operator bit, /* if 1, don't do a dirty stop because an operator is running */ 4 68 3 dont_interrupt_storage_manager /* if 1, don't stop because apl_storage_mngr_ is */ 4 69 bit, /* munging his tables */ 4 70 3 unused_interrupt_bit bit, /* not presently used */ 4 71 3 dont_interrupt_command bit, 4 72 3 can_be_interrupted bit, /* if 1, OK to do a clean stop (we are between lines, reading) */ 4 73 3 clean_interrupt_pending bit, /* interrupt occured, break cleanly (between lines) */ 4 74 3 dirty_interrupt_pending bit, /* interrupt occured, break as soon as not inhibited */ 4 75 4 76 2 user_name char (32), /* process group id of user */ 4 77 2 immediate_input_prompt char (32) varying, /* normal input */ 4 78 2 evaluated_input_prompt char (32) varying, /* quad input */ 4 79 2 character_input_prompt char (32) varying, /* quad-quote input */ 4 80 2 vcpu_time aligned, 4 81 3 total fixed bin (71), 4 82 3 setup fixed bin (71), 4 83 3 parse fixed bin (71), 4 84 3 lex fixed bin (71), 4 85 3 operator fixed bin (71), 4 86 3 storage_manager fixed bin (71), 4 87 2 output_info aligned, /* data pertaining to output buffer */ 4 88 3 output_buffer_ptr unal ptr, /* ptr to output buffer */ 4 89 3 output_buffer_len fixed bin (21), /* length (bytes) of output buffer */ 4 90 3 output_buffer_pos fixed bin (21), /* index of next byte to write in */ 4 91 3 output_buffer_ll fixed bin (21), /* print positions used up so far */ 4 92 2 tab_width fixed bin (21); /* number of columns a tabs moves cursor */ 4 93 4 94 declare output_buffer char (ws_info.output_buffer_len) based (ws_info.output_buffer_ptr); 4 95 4 96 /* internal static */ 4 97 4 98 declare max_parse_stack_depth fixed bin int static init(64536); 4 99 4 100 /* ------ END INCLUDE SEGMENT apl_ws_info.incl.pl1 -------------------------------------- */ 67 68 69 /* program */ 70 71 not_erased_msg = ""; 72 73 call apl_create_save_frame_; /* operate on global meanings */ 74 do argno = 1 to nargs; /* process each argument, left to right */ 75 76 call apl_get_symbol_ (rtrim (arglist (argno)), symb, (0)); 77 call expunge (symb); 78 call wash (symb); 79 end; 80 81 call apl_destroy_save_frame_update_; 82 83 if length (not_erased_msg) > 0 84 then do; 85 not_erased_msg = not_erased_msg || NL; 86 call iox_$put_chars (apl_static_$apl_output, addrel (addr (not_erased_msg), 1), length (not_erased_msg), 87 code); 88 end; 89 90 return; 91 92 wash: 93 proc (abp); 94 95 dcl abp unaligned pointer parameter, 96 bp unaligned pointer automatic; 97 98 bp = abp; 99 bp -> general_bead.reference_count = bp -> general_bead.reference_count - 1; 100 if bp -> general_bead.reference_count <= 0 101 then call apl_free_bead_ (bp); 102 end; 103 104 expunge: 105 proc (abp); 106 107 dcl memx fixed bin, 108 abp unaligned pointer parameter, 109 bp unaligned pointer automatic; 110 111 bp = abp; 112 if bp -> symbol_bead.meaning_pointer = null 113 then do; 114 call not_erased (bp -> symbol_bead.name); 115 return; 116 end; 117 118 if bp -> symbol_bead.meaning_pointer -> general_bead.type.group 119 then do memx = 1 to bp -> symbol_bead.meaning_pointer -> group_bead.number_of_members; 120 121 /* erase the members of a group */ 122 123 call expunge (bp -> symbol_bead.meaning_pointer -> group_bead.member (memx)); 124 end; 125 126 if bp -> symbol_bead.meaning_pointer -> general_bead.function 127 then if apl_pendant_function_check_ (bp -> symbol_bead.meaning_pointer) 128 then do; 129 call not_erased (bp -> symbol_bead.name); 130 return; 131 end; 132 133 call wash (bp -> symbol_bead.meaning_pointer); 134 bp -> symbol_bead.meaning_pointer = null; 135 return; 136 137 not_erased: 138 procedure (P_name); 139 140 /* parameters */ 141 142 declare P_name char (*) parameter; 143 144 /* program */ 145 146 if length (not_erased_msg) = 0 147 then not_erased_msg = "not erased: "; 148 149 /* Is there room to fit the text on the current output line, and is there room to fit the text in 150* the output buffer? Note that the NL doesn't count in the first test, but does count in the second. */ 151 152 if (length (not_erased_msg) + length (P_name) + 1 > ws_info.width) 153 | (length (not_erased_msg) + length (P_name) + 1 >= maxlength (not_erased_msg)) 154 then do; 155 not_erased_msg = not_erased_msg || NL; 156 call iox_$put_chars (apl_static_$apl_output, addrel (addr (not_erased_msg), 1), length (not_erased_msg), 157 code); 158 not_erased_msg = ""; 159 end; 160 161 not_erased_msg = not_erased_msg || " "; 162 not_erased_msg = not_erased_msg || P_name; 163 return; 164 165 end /* not_erased */; 166 167 end /* expunge */; 168 169 end /* apl_erase_command_ */; SOURCE FILES USED IN THIS COMPILATION. LINE NUMBER DATE MODIFIED NAME PATHNAME 0 11/29/83 1346.3 apl_erase_command_.pl1 >special_ldd>on>apl.1129>apl_erase_command_.pl1 64 1 03/27/82 0438.5 apl_bead_format.incl.pl1 >ldd>include>apl_bead_format.incl.pl1 65 2 03/27/82 0438.7 apl_group_bead.incl.pl1 >ldd>include>apl_group_bead.incl.pl1 66 3 03/27/82 0439.2 apl_symbol_bead.incl.pl1 >ldd>include>apl_symbol_bead.incl.pl1 67 4 03/27/82 0439.2 apl_ws_info.incl.pl1 >ldd>include>apl_ws_info.incl.pl1 NAMES DECLARED IN THIS COMPILATION. IDENTIFIER OFFSET LOC STORAGE CLASS DATA TYPE ATTRIBUTES AND REFERENCES (* indicates a set context) NAMES DECLARED BY DECLARE STATEMENT. NL 000525 constant char(1) initial unaligned dcl 59 ref 85 155 P_name parameter char unaligned dcl 142 ref 137 152 152 162 abp parameter pointer unaligned dcl 107 in procedure "expunge" ref 104 111 abp parameter pointer unaligned dcl 95 in procedure "wash" ref 92 98 addr builtin function dcl 37 ref 86 86 156 156 addrel builtin function dcl 37 ref 86 86 156 156 apl_create_save_frame_ 000010 constant entry external dcl 42 ref 73 apl_destroy_save_frame_update_ 000012 constant entry external dcl 42 ref 81 apl_free_bead_ 000016 constant entry external dcl 42 ref 100 apl_get_symbol_ 000014 constant entry external dcl 42 ref 76 apl_pendant_function_check_ 000020 constant entry external dcl 42 ref 126 apl_static_$apl_output 000024 external static pointer dcl 54 set ref 86* 156* apl_static_$ws_info_ptr 000026 external static structure level 1 dcl 4-11 arglist parameter char array unaligned dcl 25 ref 11 76 76 argno 000100 automatic fixed bin(17,0) dcl 30 set ref 74* 76 76* bead_type based structure level 3 packed unaligned dcl 1-3 bp 000101 automatic pointer unaligned dcl 107 in procedure "expunge" set ref 111* 112 114 118 118 123 126 126 129 133 134 bp 000100 automatic pointer unaligned dcl 95 in procedure "wash" set ref 98* 99 99 100 100* code 000101 automatic fixed bin(35,0) dcl 30 set ref 86* 156* function 0(03) based bit(1) level 4 packed unaligned dcl 1-3 ref 126 general_bead based structure level 1 dcl 1-3 group 0(04) based bit(1) level 4 packed unaligned dcl 1-3 ref 118 group_bead based structure level 1 dcl 2-7 iox_$put_chars 000022 constant entry external dcl 42 ref 86 156 length builtin function dcl 37 ref 83 86 86 146 152 152 152 152 156 156 maxlength builtin function dcl 37 ref 152 meaning_pointer 3 based pointer level 2 packed unaligned dcl 3-13 set ref 112 118 118 123 126 126* 133* 134* member 3 based pointer array level 2 packed unaligned dcl 2-7 set ref 123* memx 000100 automatic fixed bin(17,0) dcl 107 set ref 118* 123* name 5 based char level 2 packed unaligned dcl 3-13 set ref 114* 129* name_length 4 based fixed bin(17,0) level 2 dcl 3-13 ref 114 114 129 129 nargs parameter fixed bin(17,0) dcl 25 ref 11 74 not_erased_msg 000102 automatic varying char(150) dcl 30 set ref 71* 83 85* 85 86 86 86 86 146 146* 152 152 152 155* 155 156 156 156 156 158* 161* 161 162* 162 null builtin function dcl 37 ref 112 134 number_of_members 2 based fixed bin(17,0) level 2 dcl 2-7 ref 118 reference_count 1 based fixed bin(29,0) level 2 dcl 1-3 set ref 99* 99 100 rtrim builtin function dcl 37 ref 76 76 static_ws_info_ptr 000026 external static pointer level 2 packed unaligned dcl 4-11 ref 4-7 symb 000151 automatic pointer unaligned dcl 30 set ref 76* 77* 78* symbol_bead based structure level 1 dcl 3-13 type based structure level 2 packed unaligned dcl 1-3 values 2 based structure level 2 dcl 4-16 width 3 based fixed bin(17,0) level 3 dcl 4-16 ref 152 ws_info based structure level 1 dcl 4-16 ws_info_ptr 000152 automatic pointer initial dcl 4-7 set ref 4-7* 152 NAMES DECLARED BY DECLARE STATEMENT AND NEVER REFERENCED. character_value_type internal static bit(18) initial unaligned dcl 1-30 complex_value_type internal static bit(18) initial unaligned dcl 1-30 function_type internal static bit(18) initial unaligned dcl 1-30 group_type internal static bit(18) initial unaligned dcl 1-30 integral_value_type internal static bit(18) initial unaligned dcl 1-30 label_type internal static bit(18) initial unaligned dcl 1-30 lexed_function_type internal static bit(18) initial unaligned dcl 1-30 list_value_type internal static bit(18) initial unaligned dcl 1-30 max_parse_stack_depth internal static fixed bin(17,0) initial dcl 4-98 not_integer_mask internal static bit(18) initial unaligned dcl 1-30 not_zero_or_one_mask internal static bit(18) initial unaligned dcl 1-30 numeric_value_type internal static bit(18) initial unaligned dcl 1-30 operator_type internal static bit(18) initial unaligned dcl 1-30 output_buffer based char unaligned dcl 4-94 shared_variable_type internal static bit(18) initial unaligned dcl 1-30 symbol_type internal static bit(18) initial unaligned dcl 1-30 value_type internal static bit(18) initial unaligned dcl 1-30 zero_or_one_value_type internal static bit(18) initial unaligned dcl 1-30 NAMES DECLARED BY EXPLICIT CONTEXT. apl_erase_command_ 000023 constant entry external dcl 11 expunge 000252 constant entry internal dcl 104 ref 77 123 not_erased 000411 constant entry internal dcl 137 ref 114 129 wash 000220 constant entry internal dcl 92 ref 78 133 THERE WERE NO NAMES DECLARED BY CONTEXT OR IMPLICATION. STORAGE REQUIREMENTS FOR THIS PROGRAM. Object Text Link Symbol Defs Static Start 0 0 672 722 527 702 Length 1176 527 30 237 143 0 BLOCK NAME STACK SIZE TYPE WHY NONQUICK/WHO SHARES STACK FRAME apl_erase_command_ 132 external procedure is an external procedure. wash 70 internal procedure is called by several nonquick procedures. expunge 102 internal procedure calls itself recursively. not_erased internal procedure shares stack frame of internal procedure expunge. STORAGE FOR AUTOMATIC VARIABLES. STACK FRAME LOC IDENTIFIER BLOCK NAME apl_erase_command_ 000100 argno apl_erase_command_ 000101 code apl_erase_command_ 000102 not_erased_msg apl_erase_command_ 000151 symb apl_erase_command_ 000152 ws_info_ptr apl_erase_command_ expunge 000100 memx expunge 000101 bp expunge wash 000100 bp wash THE FOLLOWING EXTERNAL OPERATORS ARE USED BY THIS PROGRAM. alloc_cs call_ext_out_desc call_ext_out call_int_this call_int_other return shorten_stack ext_entry_desc int_entry THE FOLLOWING EXTERNAL ENTRIES ARE CALLED BY THIS PROGRAM. apl_create_save_frame_ apl_destroy_save_frame_update_ apl_free_bead_ apl_get_symbol_ apl_pendant_function_check_ iox_$put_chars THE FOLLOWING EXTERNAL VARIABLES ARE USED BY THIS PROGRAM. apl_static_$apl_output apl_static_$ws_info_ptr LINE LOC LINE LOC LINE LOC LINE LOC LINE LOC LINE LOC LINE LOC 11 000017 4 7 000036 71 000040 73 000041 74 000045 76 000055 77 000135 78 000144 79 000152 81 000154 83 000161 85 000163 86 000172 90 000216 92 000217 98 000225 99 000235 100 000240 102 000250 104 000251 111 000257 112 000267 114 000274 115 000307 118 000310 123 000323 124 000334 126 000336 129 000360 130 000374 133 000375 134 000405 135 000410 137 000411 146 000422 152 000432 155 000443 156 000452 158 000476 161 000500 162 000507 163 000523 ----------------------------------------------------------- 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