This is about 100x times harder to reproduce running under ktrace but I got lucky. The problematic syscall is right here:
> egrep RET read 32768/0x8000 > egrep CALL lseek(0,0,SEEK_CUR) > egrep RET lseek 32768/0x8000 > egrep CALL lseek(0,0x8000,SEEK_HOLE) > -egrep RET lseek -1 errno 6 No such device or address > -egrep CALL fstat(0x1,0x7fffffffd070) > +egrep RET lseek 32768/0x8000 > +egrep CALL lseek(0,0x8000,SEEK_SET) > +egrep RET lseek 32768/0x8000 > +egrep CALL fstat(0x1,0x7fffffffca40) Only if the lseek *fails*, it continues normally, reading from stdin here and outputting matches to stdout. If the lseek succeds, it aborts with "Binary file (standard input) matches". > -egrep CALL read(0,0x636000,0x8000) > -egrep GIO fd 0 read 1164 bytes [...] > -egrep RET read 1164/0x48c > -egrep CALL read(0,0x63648c,0x7000) > -egrep GIO fd 0 read 0 bytes > -"" > -egrep RET read 0 > -egrep CALL write(0x1,0x8007ff000,0x952) > -egrep GIO fd 1 wrote 2386 bytes [...] > +egrep CALL write(0x1,0x8007ff000,0x25) > +egrep GIO fd 1 wrote 37 bytes > +"Binary file (standard input) matches > " > -egrep RET write 2386/0x952 > +egrep RET write 37/0x25 It exits with zero status either way (indicating there were matches). Regards, -- Steven Chamberlain [email protected] -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]
