Re: lpr: order of print requests

[Lorenzo Iania]

Konrad Heuer wrote                                > Hmm, I've never seen such a strange behaviour. Lpd should do FIFO. Could > you give some more infos about your environment (os release, input filter > program, printer type)? Yes, I think it's a very strange behaviour. In effect in the file /usr/src/usr.sbin/lpr/common_source/common.c there is:   ..... /*  * Scan the current directory and make a list of daemon files sorted by  * creation time.  * Return the number of entries and a pointer to the list.  */ int getq(pp, namelist)         const struct printer *pp;         struct queue *(*namelist[]); { .....   However I had the problem in more than one installation of the os from 2.2.7 to 3.4. The printers are used in a very simple way,   ... lp|local line printer:\         :sh:sf:mx#0:\         :lp=/dev/lpt0:sd=/usr/spool/output/lpd:lf=/var/log/lpd-errs: ....   but the order is wrong. The problem occur when the number of consecutive requests grows, i. e. when I have to print requests from 1 to 100 (from tha same process), the first 40 are in the right order, then are printed those from 50 to 100 in the right order and at last those from 41 to 49. All I do is simply open a pipe by a call to   fp=popen("lpr -Plp","a"); fprintf(fp,XXXXX); .... . .. . fclose(fp);   The contents are almost the same for each request, simply characters; I don't use any input filter. The printer is always a character printer like IBM, EPSON ...   So I don't understand why this happens.   Any suggestions??