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Length: 3132 (0xc3c)
Types: TextFile
Names: »maint.doc«
└─⟦a0efdde77⟧ Bits:30001252 EUUGD11 Tape, 1987 Spring Conference Helsinki
└─ ⟦this⟧ »EUUGD11/euug-87hel/sec8/multivol/maint.doc«
multivol.doc V1.00 01-Jun-85 Tony O'Hagan Documentation on developement of multi-volume backup utility "multivol". Global flags 1. rd_flag -i Read each volume -> stdout 2. wr_flag -o Write each volume stdin -> 3. dsp_vol -t Attempt to read & print each volume header -> stderr 4. dsp_blks -v Indicate number of blocks read/written -> stderr 5. vfy_vol -w Allow user to verify each volume mounted -> stderr /dev/tty -> When dsp_vol is set the following will be tested :- Writing:- * Writing over a volume in the set being tested; Reading:- * Reading a volume with a time stamp different from first volume read; * Reading volumes out of sequence * Check that label corresponds (if specified) Queries:- a. What will happen if no blocks have ever been written to the volume and an attempt is made to read the volumes header ? ============================================================================== multivol V2.00 01-Jul-85 Tony O'Hagan & Tim Roper Buffer data structure :- First volume block Other volume blocks . --------------- <- buf_ptr -> --------------- /|\ | block header | (word aligned)| | | |---------------| | | | | | | | | | volume header | |---------------| . | | | | block header | /|\ | --------------- <- dta_ptr -> --------------- | | | | (word aligned)| | | | | | | | | blk_siz | data | | | | | | | | data | blk_siz | | | | | | \!/ | | | | | |---------------| | | | | | | | | | | | | \!/ --------------- --------------- sizeof(vol_hdr) and sizeof(blk_hdr) must both be an integral number of word alignment units. ======================================================================== 19-Jul-85 Tony O'Hagan Using /dev/rmt0, doesn't appear to read volume header unless the block size matches the written block size. I/O failure. ======================================================================== 7-Aug-85 Tony O'Hagan Expected lint errors :- (Perkin-Elmer V7 lint) "rd.c", line 150: warning: possible pointer alignment problem "rd.c", line 152: warning: possible pointer alignment problem "wr.c", line 149: warning: possible pointer alignment problem "vhdr.c", line 51: warning: possible pointer alignment problem "vhdr.c", line 85: warning: blk_siz redefinition hides earlier one askf returns value which is always ignored close returns value which is always ignored fgets returns value which is always ignored mount_v returns value which is sometimes ignored rd_put_ returns value which is always ignored sprintf returns value which is always ignored sscanf returns value which is sometimes ignored strncpy returns value which is always ignored write returns value which is sometimes ignored ======================================================================== Tony O'Hagan Australia: (07) 3774125 International: +61 7 3774125 University of Queensland CSNET: tony@uqcspe.oz ACSnet: tony@uqcspe.oz Dept. of Computer Science UUCP: ...!seismo!munnari!uqcspe.oz!tony St. Lucia, Brisbane, ARPA: tony%uqcspe.oz@seismo.css.gov AUSTRALIA 4067 JANET: uqcspe.oz!tony@ukc