Date: Tue, 2 May 2000 17:49:01 +0200 From: "Lorenzo Iania" <l.iania@sintesi.net> To: <freebsd-hackers@freebsd.org> Subject: Re: lpr: order of print requests Message-ID: <047901bfb44d$f0173f00$0500000a@sintesi.intr>
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Konrad Heuer wrote
=20
> 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=3D/dev/lpt0:sd=3D/usr/spool/output/lpd:lf=3D/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=20
fp=3Dpopen("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??
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<META content=3D"text/html; charset=3Dwindows-1252" =
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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Konrad Heuer wrote</FONT></DIV>
<DIV><FONT face=3DArial=20
size=3D2> &nbs=
p;  =
; =20
</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>> Hmm, I've never seen such a =
strange behaviour.=20
Lpd should do FIFO. Could<BR>> you give some more infos about your=20
environment (os release, input filter<BR>> program, printer=20
type)?<BR></FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Yes, I think it's a very strange=20
behaviour.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>In effect in the file=20
/usr/src/usr.sbin/lpr/common_source/common.c there is:</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>.....</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>/*<BR> * Scan the current =
directory and make a=20
list of daemon files sorted by<BR> * creation time.<BR> * =
Return the=20
number of entries and a pointer to the =
list.<BR> */<BR>int<BR>getq(pp,=20
namelist)<BR> const struct =
printer=20
*pp;<BR> struct queue=20
*(*namelist[]);<BR>{<BR>.....</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>However I had the problem in more than =
one=20
installation of the os from 2.2.7 to 3.4.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>The printers are used in a very simple=20
way,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>...</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>lp|local line=20
printer:\<BR> =20
:sh:sf:mx#0:\<BR> =20
:lp=3D/dev/lpt0:sd=3D/usr/spool/output/lpd:lf=3D/var/log/lpd-errs:<BR>...=
.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>but the order is wrong. The problem =
occur when the=20
number of consecutive requests grows, i. e. when I have to print =
requests from 1=20
to 100 (from tha same process), the first 40 are in the right order, =
then are=20
printed those from 50 to 100 in the right order and at last those from =
41 to=20
49.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>All I do is simply open a pipe by a =
call to=20
</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>fp=3Dpopen("lpr =
-Plp","a");</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>fprintf(fp,XXXXX);</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>....</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>..</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>fclose(fp);</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>The contents are almost the same for =
each request,=20
simply characters; I don't use any input filter. The printer is =
always a=20
character printer like IBM, EPSON ...</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>So I don't understand why this=20
happens.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>Any suggestions??</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2><BR> </DIV></FONT></BODY></HTML>
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