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The C and C++ Include Header Files

/usr/include/asm-generic/shmbuf.h

$ cat -n /usr/include/asm-generic/shmbuf.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	#ifndef __ASM_GENERIC_SHMBUF_H
     3	#define __ASM_GENERIC_SHMBUF_H
     4	
     5	#include <asm/bitsperlong.h>
     6	#include <asm/ipcbuf.h>
     7	#include <asm/posix_types.h>
     8	
     9	/*
    10	 * The shmid64_ds structure for x86 architecture.
    11	 * Note extra padding because this structure is passed back and forth
    12	 * between kernel and user space.
    13	 *
    14	 * shmid64_ds was originally meant to be architecture specific, but
    15	 * everyone just ended up making identical copies without specific
    16	 * optimizations, so we may just as well all use the same one.
    17	 *
    18	 * 64 bit architectures use a 64-bit long time field here, while
    19	 * 32 bit architectures have a pair of unsigned long values.
    20	 * On big-endian systems, the lower half is in the wrong place.
    21	 *
    22	 *
    23	 * Pad space is left for:
    24	 * - 2 miscellaneous 32-bit values
    25	 */
    26	
    27	struct shmid64_ds {
    28		struct ipc64_perm	shm_perm;	/* operation perms */
    29		__kernel_size_t		shm_segsz;	/* size of segment (bytes) */
    30	#if __BITS_PER_LONG == 64
    31		long			shm_atime;	/* last attach time */
    32		long			shm_dtime;	/* last detach time */
    33		long			shm_ctime;	/* last change time */
    34	#else
    35		unsigned long		shm_atime;	/* last attach time */
    36		unsigned long		shm_atime_high;
    37		unsigned long		shm_dtime;	/* last detach time */
    38		unsigned long		shm_dtime_high;
    39		unsigned long		shm_ctime;	/* last change time */
    40		unsigned long		shm_ctime_high;
    41	#endif
    42		__kernel_pid_t		shm_cpid;	/* pid of creator */
    43		__kernel_pid_t		shm_lpid;	/* pid of last operator */
    44		unsigned long		shm_nattch;	/* no. of current attaches */
    45		unsigned long		__unused4;
    46		unsigned long		__unused5;
    47	};
    48	
    49	struct shminfo64 {
    50		unsigned long		shmmax;
    51		unsigned long		shmmin;
    52		unsigned long		shmmni;
    53		unsigned long		shmseg;
    54		unsigned long		shmall;
    55		unsigned long		__unused1;
    56		unsigned long		__unused2;
    57		unsigned long		__unused3;
    58		unsigned long		__unused4;
    59	};
    60	
    61	#endif /* __ASM_GENERIC_SHMBUF_H */
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