The C and C++ Include Header Files

/usr/include/linux/lp.h


$ cat -n /usr/include/linux/lp.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	/*
     3	 * usr/include/linux/lp.h c.1991-1992 James Wiegand
     4	 * many modifications copyright (C) 1992 Michael K. Johnson
     5	 * Interrupt support added 1993 Nigel Gamble
     6	 * Removed 8255 status defines from inside __KERNEL__ Marcelo Tosatti 
     7	 */
     8	#ifndef _LINUX_LP_H
     9	#define _LINUX_LP_H
    10	
    11	#include <linux/types.h>
    12	#include <linux/ioctl.h>
    13	
    14	/*
    15	 * Per POSIX guidelines, this module reserves the LP and lp prefixes
    16	 * These are the lp_table[minor].flags flags...
    17	 */
    18	#define LP_EXIST 0x0001
    19	#define LP_SELEC 0x0002
    20	#define LP_BUSY	 0x0004
    21	#define LP_BUSY_BIT_POS 2
    22	#define LP_OFFL	 0x0008
    23	#define LP_NOPA  0x0010
    24	#define LP_ERR   0x0020
    25	#define LP_ABORT 0x0040
    26	#define LP_CAREFUL 0x0080 /* obsoleted -arca */
    27	#define LP_ABORTOPEN 0x0100
    28	
    29	#define LP_TRUST_IRQ_  0x0200 /* obsolete */
    30	#define LP_NO_REVERSE  0x0400 /* No reverse mode available. */
    31	#define LP_DATA_AVAIL  0x0800 /* Data is available. */
    32	
    33	/* 
    34	 * bit defines for 8255 status port
    35	 * base + 1
    36	 * accessed with LP_S(minor), which gets the byte...
    37	 */
    38	#define LP_PBUSY	0x80  /* inverted input, active high */
    39	#define LP_PACK		0x40  /* unchanged input, active low */
    40	#define LP_POUTPA	0x20  /* unchanged input, active high */
    41	#define LP_PSELECD	0x10  /* unchanged input, active high */
    42	#define LP_PERRORP	0x08  /* unchanged input, active low */
    43	
    44	/* timeout for each character.  This is relative to bus cycles -- it
    45	 * is the count in a busy loop.  THIS IS THE VALUE TO CHANGE if you
    46	 * have extremely slow printing, or if the machine seems to slow down
    47	 * a lot when you print.  If you have slow printing, increase this
    48	 * number and recompile, and if your system gets bogged down, decrease
    49	 * this number.  This can be changed with the tunelp(8) command as well.
    50	 */
    51	
    52	#define LP_INIT_CHAR 1000
    53	
    54	/* The parallel port specs apparently say that there needs to be
    55	 * a .5usec wait before and after the strobe.
    56	 */
    57	
    58	#define LP_INIT_WAIT 1
    59	
    60	/* This is the amount of time that the driver waits for the printer to
    61	 * catch up when the printer's buffer appears to be filled.  If you
    62	 * want to tune this and have a fast printer (i.e. HPIIIP), decrease
    63	 * this number, and if you have a slow printer, increase this number.
    64	 * This is in hundredths of a second, the default 2 being .05 second.
    65	 * Or use the tunelp(8) command, which is especially nice if you want
    66	 * change back and forth between character and graphics printing, which
    67	 * are wildly different...
    68	 */
    69	
    70	#define LP_INIT_TIME 2
    71	
    72	/* IOCTL numbers */
    73	#define LPCHAR   0x0601  /* corresponds to LP_INIT_CHAR */
    74	#define LPTIME   0x0602  /* corresponds to LP_INIT_TIME */
    75	#define LPABORT  0x0604  /* call with TRUE arg to abort on error,
    76				    FALSE to retry.  Default is retry.  */
    77	#define LPSETIRQ 0x0605  /* call with new IRQ number,
    78				    or 0 for polling (no IRQ) */
    79	#define LPGETIRQ 0x0606  /* get the current IRQ number */
    80	#define LPWAIT   0x0608  /* corresponds to LP_INIT_WAIT */
    81	/* NOTE: LPCAREFUL is obsoleted and it' s always the default right now -arca */
    82	#define LPCAREFUL   0x0609  /* call with TRUE arg to require out-of-paper, off-
    83				    line, and error indicators good on all writes,
    84				    FALSE to ignore them.  Default is ignore. */
    85	#define LPABORTOPEN 0x060a  /* call with TRUE arg to abort open() on error,
    86				    FALSE to ignore error.  Default is ignore.  */
    87	#define LPGETSTATUS 0x060b  /* return LP_S(minor) */
    88	#define LPRESET     0x060c  /* reset printer */
    89	#ifdef LP_STATS
    90	#define LPGETSTATS  0x060d  /* get statistics (struct lp_stats) */
    91	#endif
    92	#define LPGETFLAGS  0x060e  /* get status flags */
    93	#define LPSETTIMEOUT_OLD 0x060f /* set parport timeout */
    94	#define LPSETTIMEOUT_NEW \
    95		_IOW(0x6, 0xf, __s64[2]) /* set parport timeout */
    96	#if __BITS_PER_LONG == 64
    97	#define LPSETTIMEOUT LPSETTIMEOUT_OLD
    98	#else
    99	#define LPSETTIMEOUT (sizeof(time_t) > sizeof(__kernel_long_t) ? \
   100		LPSETTIMEOUT_NEW : LPSETTIMEOUT_OLD)
   101	#endif
   102	
   103	/* timeout for printk'ing a timeout, in jiffies (100ths of a second).
   104	   This is also used for re-checking error conditions if LP_ABORT is
   105	   not set.  This is the default behavior. */
   106	
   107	#define LP_TIMEOUT_INTERRUPT	(60 * HZ)
   108	#define LP_TIMEOUT_POLLED	(10 * HZ)
   109	
   110	
   111	#endif /* _LINUX_LP_H */