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  man pages->Tru64 Unix man pages -> lpd (8)              



NAME    [Toc]    [Back]

       lpd - line printer daemon

SYNOPSIS    [Toc]    [Back]

       /usr/lbin/lpd [-l]

OPTIONS    [Toc]    [Back]

       Causes  the lpd daemon to log valid requests received from
       the network. This option is useful for debugging.

DESCRIPTION    [Toc]    [Back]

       The lpd line printer daemon (spool area handler)  normally
       is  invoked  at boot time.  The daemon makes a single pass
       through the printcap(4) file  to  determine  the  existing
       printers  and  to  print  all  files that were not printed
       before the system shut down. The daemon uses system  calls
       listen(2) and accept(2) to receive requests to print files
       in the queue, to transfer files to the spooling area,  and
       to  display  the  queue or remove jobs from the queue.  In
       each case, the daemon forks a child process to handle  the
       request  so that the parent process can continue to listen
       for more requests.   The  Internet  port  number  used  to
       interact  with other processes is identified with the getservbyname(3)  system  call  and  is  specified   in   the
       /etc/services file by its printer service record entry.

       Access control is provided by the following means:

       All  requests  must  originate  from  one  of the machines
       listed in the /etc/hosts.equiv or /etc/hosts.lpd file.

       When an rs capability, which  restricts  remote  users  to
       those with local accounts, is specified in the /etc/printcap
 file for the printer being  accessed,  an  lpr  or  lp
       request is honored only for those users having accounts on
       the same machine as the printer.

       The minfree ASCII file in each  spool  directory  contains
       the  number  of disk blocks to leave free so that the line
       printer queue will not completely fill the disk.

       The lock file in each /usr/spool subdirectory is  used  to
       prevent  more  than  one  active  lpd  daemon and to store
       information about the daemon  process  for  other  printer
       spooling commands.

       After  the lpd daemon has successfully set the lock in the
       lock file, it scans the /usr/spool subdirectory for  files
       beginning  with the characters cf.  Records in each of the
       cf files specify files to be printed  or  specify  one  or
       more  non-printing  actions  to  be  performed.  Each such
       record begins with a key character that specifies what  to
       do  with  the  remainder  of  the  line.  In the following
       table, the columns list the beginning key  character,  the
       key-character  name,  and its purpose: Name of the machine
       where the lpr daemon or the lp command was invoked.  Login
       name  of  the  person  who invoked the lpr or lp commands.
       This record is used to verify ownership  by  the  lprm  or
       cancel  commands.   String  to be used for the job name on
       the burst page.  String to be used for the  classification
       line   on  the  burst  page.   The  record  line  provides
       identification information from the  etc/passwd  file  and
       initiates  banner  page printing.  The number of character
       spaces to indent the output (spacing  is  from  the  ASCII
       character set).  Sends mail to the specified user when the
       current print job completes.  Name of another font file to
       use  in  place  of the default font file.  Name of another
       font file to use in place of the default font file.   Name
       of  another  font file to use in place of the default font
       file.  Name of another font file to use in  place  of  the
       default font file.  Changes the page width (in characters)
       used by the pr command and by text filters.   Selects  the
       input tray that supplies paper for the print job.  Selects
       the output tray where  the  printed  paper  is  deposited.
       Specifies  the  orientation  of  the printed output on the
       page. Note that for certain print filters, such as  pcfof,
       the O option is used to specify other options such as even
       to print even-numbered pages.  Specifies whether  the  job
       should  be printed on both sides of the physical sheet and
       whether the  pages  should  be  rotated  by  180  degrees.
       String  to  be used as the title for the pr command.  Name
       of an already formatted file to print.  Name of a file  to
       print using the pr command as a filter.  Similar to f, but
       passes control characters and does not make  page  breaks.
       The  file  contains troff output (cat phototypesetter commands).
  The file contains DVI (device-independent)  troff
       output.   The file contains Tex(l) output (DVI format from
       Stanford).  The file contains a raster  image.   The  file
       contains  data  produced by the cifplot command.  The file
       contains text data with Fortran carriage  control  characters.
   Do  not  interpret  any  control characters in the
       file.  Name of file to remove on completion  of  printing.
       The  name  of the file undergoing printing, or when blank,
       for the standard input (when the  lpr  or  lp  command  is
       invoked  in a pipeline or when the command is invoked from
       the standard input).

       Whenever a file cannot be opened for printing,  a  message
       is  logged  via  the syslog(3) subroutine using theLOG_LPR
       facility.  In this case, the lpd daemon tries to reopen  a
       file, which it expects to be referenced by a correct pathname,
 up to 20 times.  If a file cannot be opened after 20
       tries, lpd goes to the next file.


       lpd daemon uses the flock(2) system call to provide exclusive
 access to the lock file and to prevent multiple  daemons
  from  being simultaneously activated.  If the daemon
       is killed or dies unexpectedly, the  lock  file  does  not
       have to be removed.

       The  2-line ASCII /usr/spool/lock file contains two lines.
       The first line specifies the process ID of the daemon, and
       the second line specifies the control file name of the job
       currently undergoing printing.  The second line is updated
       to  reflect  the current status of the lpd daemon for commands
 lpq, lprm, cancel, and lpstat.

   NOTE - Printer Log Files    [Toc]    [Back]
       The lpd does  not  automatically  purge  log  files.   You
       should  monitor  logs  regularly or set up a cleaning task
       using the cron command.  See  similar  commands  for  syslog.dated
 in /usr/var/spool/cron/crontabs

FILES    [Toc]    [Back]

       Specifies  the  command  path.   Printer description file.
       Spool directories.  The location of spool directories is a
       convention,  but  not  necessary  (see  the  /etc/printcap
       file).  The transient lock file which records print daemon
       and job status.  On clustered systems, this transient file
       is created to contain the daemon status.   Note  that  the
       /usr/spool/lpd  directory  is a Context Dependent Symbolic
       Link  (CDSL)  and  should  not  be  manually  created   or
       destroyed.   Minimum  free  disk  space  to  leave.   Line
       printer  devices.   Socket  for  local  requests.    Lists
       machine  names allowed access to a printer.  Lists machine
       names allowed access to a printer, but which are not under
       same administrative control.

SEE ALSO    [Toc]    [Back]

       Commands:   cancel(1),   lp(1),  lpc(8),  lpr(1),  lpq(1),
       lpstat(1), lprm(1), pac(8), pcfof(8)

       Calls: syslog(3)

[ Back ]
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