The C and C++ Include Header Files

/usr/include/linux/atmapi.h


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

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	/* atmapi.h - ATM API user space/kernel compatibility */
     3	 
     4	/* Written 1999,2000 by Werner Almesberger, EPFL ICA */
     5	 
     6	
     7	#ifndef _LINUX_ATMAPI_H
     8	#define _LINUX_ATMAPI_H
     9	
    10	#if defined(__sparc__) || defined(__ia64__)
    11	/* such alignment is not required on 32 bit sparcs, but we can't
    12	   figure that we are on a sparc64 while compiling user-space programs. */
    13	#define __ATM_API_ALIGN	__attribute__((aligned(8)))
    14	#else
    15	#define __ATM_API_ALIGN
    16	#endif
    17	
    18	
    19	/*
    20	 * Opaque type for kernel pointers. Note that _ is never accessed. We need
    21	 * the struct in order hide the array, so that we can make simple assignments
    22	 * instead of being forced to use memcpy. It also improves error reporting for
    23	 * code that still assumes that we're passing unsigned longs.
    24	 *
    25	 * Convention: NULL pointers are passed as a field of all zeroes.
    26	 */
    27	 
    28	typedef struct { unsigned char _[8]; } __ATM_API_ALIGN atm_kptr_t;
    29	
    30	#endif