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LPD(8) BSD System Manager's Manual LPD(8)

NNAAMMEE
llppdd - line printer spooler daemon

SSYYNNOOPPSSIISS
llppdd [--ll] [_p_o_r_t_#]

DDEESSCCRRIIPPTTIIOONN
LLppdd is the line printer daemon (spool area handler) and is normally in-
voked at boot time from the rc(8) file. It makes a single pass through
the printcap(5) file to find out about the existing printers and prints
any files left after a crash. It then uses the system calls listen(2) and
accept(2) to receive requests to print files in the queue, transfer files
to the spooling area, display the queue, or remove jobs from the queue.
In each case, it forks a child to handle the request so the parent can
continue to listen for more requests.

Available options:

--ll The --ll flag causes llppdd to log valid requests received from the
network. This can be useful for debugging purposes.

_p_o_r_t_# The Internet port number used to rendezvous with other processes
is normally obtained with getservbyname(3) but can be changed
with the _p_o_r_t_# argument.

Access control is provided by two means. First, all requests must come
from one of the machines listed in the file _/_e_t_c_/_h_o_s_t_s_._e_q_u_i_v or
_/_e_t_c_/_h_o_s_t_s_._l_p_d. Second, if the rs capability is specified in the printcap
entry for the printer being accessed, _l_p_r requests will only be honored
for those users with accounts on the machine with the printer.

The file _m_i_n_f_r_e_e in each spool directory contains the number of disk
blocks to leave free so that the line printer queue won't completely fill
the disk. The _m_i_n_f_r_e_e file can be edited with your favorite text editor.

The daemon begins processing files after it has successfully set the lock
for exclusive access (descibed a bit later), and scans the spool directo-
ry for files beginning with _c_f. Lines in each _c_f file specify files to be
printed or non-printing actions to be performed. Each such line begins
with a key character to specify what to do with the remainder of the
line.

J Job Name. String to be used for the job name on the burst page.

C Classification. String to be used for the classification line on
the burst page.

L Literal. The line contains identification info from the password
file and causes the banner page to be printed.

T Title. String to be used as the title for pr(1).

H Host Name. Name of the machine where lpr was invoked.

P Person. Login name of the person who invoked lpr. This is used
to verify ownership by lprm.

M Send mail to the specified user when the current print job com-
pletes.

f Formatted File. Name of a file to print which is already format-

ted.

l Like ``f'' but passes control characters and does not make page
breaks.

p Name of a file to print using pr(1) as a filter.

t Troff File. The file contains troff(1) output (cat phototypeset-
ter commands).

n Ditroff File. The file contains device independent troff output.

r DVI File. The file contains Tex l output DVI format from Stand-
ford).

g Graph File. The file contains data produced by plot(3).

c Cifplot File. The file contains data produced by _c_i_f_p_l_o_t.

v The file contains a raster image.

r The file contains text data with FORTRAN carriage control charac-
ters.

1 Troff Font R. Name of the font file to use instead of the de-
fault.

2 Troff Font I. Name of the font file to use instead of the de-
fault.

3 Troff Font B. Name of the font file to use instead of the de-
fault.

4 Troff Font S. Name of the font file to use instead of the de-
fault.

W Width. Changes the page width (in characters) used by pr(1) and
the text filters.

I Indent. The number of characters to indent the output by (in
ascii).

U Unlink. Name of file to remove upon completion of printing.

N File name. The name of the file which is being printed, or a
blank for the standard input (when lpr is invoked in a pipeline).

If a file can not be opened, a message will be logged via syslog(3) using
the _L_O_G___L_P_R facility. LLppdd will try up to 20 times to reopen a file it
expects to be there, after which it will skip the file to be printed.

LLppdd uses flock(2) to provide exclusive access to the lock file and to
prevent multiple deamons from becoming active simultaneously. If the
daemon should be killed or die unexpectedly, the lock file need not be
removed. The lock file is kept in a readable ASCII form and contains two
lines. The first is the process id of the daemon and the second is the
control file name of the current job being printed. The second line is
updated to reflect the current status of llppdd for the programs lpq(1) and
lprm(1).

FFIILLEESS
/etc/printcap printer description file
/var/spool/* spool directories
/var/spool/*/minfree minimum free space to leave

/dev/lp* line printer devices
/dev/printer socket for local requests
/etc/hosts.equiv lists machine names allowed printer access
/etc/hosts.lpd lists machine names allowed printer access, but not
under same administrative control.

SSEEEE AALLSSOO
lpc(8), pac(1), lpr(1), lpq(1), lprm(1), syslog(3), printcap(5)

_4_._2 _B_S_D _L_i_n_e _P_r_i_n_t_e_r _S_p_o_o_l_e_r _M_a_n_u_a_l.

HHIISSTTOORRYY
An llppdd daemon appeared in Version 6 AT&T UNIX.

4.2 Berkeley Distribution June 6, 1993 3