Every two digits a file is locked. First digit: which file, second digit: which program, XX indicates a lock conflict or failure Starting test 4 on /tmp/_locktest XX3a 17XX3aXX32 16XX22 14XX32XX18 03XX22XX10 02XX8 01XX1XX10XX2a 15XX2a Starting test 2 on /tmp/_locktest 04 17 03 15 14 16 12 05 02 00 07 06 04 01 02 05 04 07 05 04 01 06 03 00 10 14 10 12 10 01 06 06 02 03 01 03 00 13 06 10 03 13 10 05 Starting test 2 on ./_locktest 02 17 01 00 16 13 15 02 01 00 14 17 16 15 03 04 11 06 07 12 05 10 13 00 14 16 15 03 00 04 17 11 12 01 13 15 02 16 03 14 10 05 17 06 04 11 12 13 15 01 02 16 05 10 05 14 06 17 11 06 13 07 12 10 01 07 Starting test 3 on /tmp/_locktest