Home
Main website
Display Sidebar
Hide Ads
Recent Changes
View Source:
lp(4)
Edit
PageHistory
Diff
Info
LikePages
LP !!!LP NAME SYNOPSIS CONFIGURATION DESCRIPTION FILES AUTHORS SEE ALSO ---- !!NAME lp - line printer devices !!SYNOPSIS __#include __ !!CONFIGURATION __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, e.g. for laser printers. For usual dot matrix printers polling will usually be enough. The default is polling. !!DESCRIPTION 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 driver. __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 strobing the printer to accept a just-written character, and the number 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() 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: Refer to your printer manual for the meaning of the signals. Note that undocumented bits may also be set, depending on your printer. __int ioctl(int__ ''fd''__, LPRESET)__ Resets the printer. No argument is used. !!FILES /dev/lp* !!AUTHORS The printer driver was originally written by Jim Weigand and Linus Torvalds. It was further improved by Michael K. Johnson. The interrupt code was written by Nigel Gamble. Alan Cox modularised it. LPCAREFUL, LPABORT, LPGETSTATUS were added by Chris Metcalf. !!SEE ALSO mknod(1), chown(1), chmod(1), tunelp(8), lpcntl(8) ----
One page links to
lp(4)
:
Man4l
This page is a man page (or other imported legacy content). We are unable to automatically determine the license status of this page.
