Show pageOld revisionsBacklinksBack to top This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong. ====== IOF_VERS ====== This trap sets or reads the file version number. ^Call Parameters^^Return Parameters^^ |D0.B|$4E|D0.L|Error return.| |D1.L|Version |D1.L|Version.| |D3.W|Timeout |D3.L|Preserved.| |A0.L|Channel ID |A0.L|Preserved.| ===== Errors ===== Any I/O sub system errors including |ERR_NC|Not complete.| ===== Notes ===== * All registers not shown above are not used on entry and are preserved on exit. * D1.L has three initial values: *-1 causes the file version number to be returned in D1.L. *0 causes the the file version number to be set to its current value and returned in D1.L. *1 to 65535 causes the value in D1.L to be set as the new version number. The value in D1.L is preserved on return. *If the version number is set by this trap, it will not be incremented when the file is closed, or flushed. ===== Example ===== The example below shows the use of this trap call to set the version number of a file in D7.L and prevent its being incremented when the file is closed. <code> vers moveq #io_open,d0 ; $01 moveq #-1,d1 ; This job moveq #0,d3 ; OPEN lea name,a1 ; Name of file trap #2 ; Open the file tst.l d0 ; OK? . . bne error ; . . no! moveq #0,d1 ; To find the version number moveq #-1,d3 ; Timeout moveq #iof_vers,d0 ; $4E trap #3 ; Find the version tst.l d0 ; OK? . . bne error ; . . no! move.l d1,d7 ; Set the version number in D7.L moveq #io_close,d0 ; $02 tst.l d0 ; OK? . . bne error ; . . no! name dc.w name_e-name-2 ; Length of name dc.b "flp1_klok" name_e ds.b 0 </code> qdosmsq/traps/trap_3/vers.txt Last modified: 2009/06/01 10:23by george.gwilt
george.gwilt