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LP(4)			   Linux Programmer's Manual			 LP(4)

       lp - line printer devices

       #include <linux/lp.h>

       lp[0–2] are character devices for the parallel line printers; they have
       major number 6 and minor number 0–2.  The minor numbers	correspond  to
       the  printer  port  base	 addresses 0x03bc, 0x0378 and 0x0278.  Usually
       they have mode 220 and are owned by root and group  lp.	 You  can  use
       printer	ports  either with polling or with interrupts.	Interrupts are
       recommended when high traffic  is  expected,  for  example,  for	 laser
       printers.   For	usual  dot  matrix  printers  polling  will usually be
       enough.	The default is polling.

       The following ioctl(2) calls are supported:

       int ioctl(int fd, LPTIME, int arg)
	      Sets the amount of time that the driver sleeps before rechecking
	      the  printer  when  the printer's buffer appears to be filled to
	      arg.  If you have a fast printer, decrease this number;  if  you
	      have a slow printer, then increase it.  This is in hundredths of
	      a second, the default 2 being 0.02 seconds.  It only  influences
	      the polling driver.

       int ioctl(int fd, LPCHAR, int arg)
	      Sets  the	 maximum  number  of  busy-wait	 iterations  which the
	      polling driver does while waiting for the printer to  get	 ready
	      for  receiving  a	 character  to	arg.  If printing is too slow,
	      increase this number; if the system gets too slow, decrease this
	      number.	The  default  is 1000.	It only influences the polling

       int ioctl(int fd, LPABORT, int arg)
	      If arg is 0, the printer driver will retry on errors,  otherwise
	      it will abort.  The default is 0.

       int ioctl(int fd, LPABORTOPEN, int arg)
	      If  arg  is 0, open(2) will be aborted on error, otherwise error
	      will be ignored.	The default is to ignore it.

       int ioctl(int fd, LPCAREFUL, int arg)
	      If arg is 0, then the out-of-paper, offline  and	error  signals
	      are  required  to	 be  false  on	all writes, otherwise they are
	      ignored.	The default is to ignore them.

       int ioctl(int fd, LPWAIT, int arg)
	      Sets the number of busy waiting iterations to wait before strob‐
	      ing the printer to accept a just-written character, and the num‐
	      ber of iterations to wait before turning the strobe  off	again,
	      to  arg.	 The  specification  says  this	 time  should  be  0.5
	      microseconds, but experience has shown the delay caused  by  the
	      code  is	already enough.	 For that reason, the default value is
	      0.  This is used for both the polling and the interrupt driver.

       int ioctl(int fd, LPSETIRQ, int arg)
	      This ioctl(2) requires superuser privileges.  It	takes  an  int
	      containing  the  new  IRQ	 as  argument.	 As a side effect, the
	      printer will be reset.  When arg is 0, the polling  driver  will
	      be used, which is also default.

       int ioctl(int fd, LPGETIRQ, int *arg)
	      Stores the currently used IRQ in arg.

       int ioctl(int fd, LPGETSTATUS, int *arg)
	      Stores  the  value of the status port in arg.  The bits have the
	      following meaning:

	      LP_PBUSY	   inverted busy input, active high
	      LP_PACK	   unchanged acknowledge input, active low
	      LP_POUTPA	   unchanged out-of-paper input, active high
	      LP_PSELECD   unchanged selected input, active high
	      LP_PERRORP   unchanged error input, active low

	      Refer to your printer manual for the  meaning  of	 the  signals.
	      Note  that  undocumented bits may also be set, depending on your

       int ioctl(int fd, LPRESET)
	      Resets the printer.  No argument is used.


       chmod(1), chown(1), mknod(1), lpcntl(8), tunelp(8)

       This page is part of release 3.65 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux				  1995-01-15				 LP(4)

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