The C and C++ Include Header Files

/usr/include/cpio.h


$ cat -n /usr/include/cpio.h

     1	/* Extended cpio format from POSIX.1.
     2	   This file is part of the GNU C Library.
     3	   Copyright (C) 1992-2024 Free Software Foundation, Inc.
     4	   NOTE: The canonical source of this file is maintained with the GNU cpio.
     5	
     6	   The GNU C Library is free software; you can redistribute it and/or
     7	   modify it under the terms of the GNU Lesser General Public
     8	   License as published by the Free Software Foundation; either
     9	   version 2.1 of the License, or (at your option) any later version.
    10	
    11	   The GNU C Library is distributed in the hope that it will be useful,
    12	   but WITHOUT ANY WARRANTY; without even the implied warranty of
    13	   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    14	   Lesser General Public License for more details.
    15	
    16	   You should have received a copy of the GNU Lesser General Public
    17	   License along with the GNU C Library; if not, see
    18	   <https://www.gnu.org/licenses/>.  */
    19	
    20	#ifndef _CPIO_H
    21	#define _CPIO_H 1
    22	
    23	/* A cpio archive consists of a sequence of files.
    24	   Each file has a 76 byte header,
    25	   a variable length, NUL terminated filename,
    26	   and variable length file data.
    27	   A header for a filename "TRAILER!!!" indicates the end of the archive.  */
    28	
    29	/* All the fields in the header are ISO 646 (approximately ASCII) strings
    30	   of octal numbers, left padded, not NUL terminated.
    31	
    32	   Field Name	Length in Bytes	Notes
    33	   c_magic	6		must be "070707"
    34	   c_dev	6
    35	   c_ino	6
    36	   c_mode	6		see below for value
    37	   c_uid	6
    38	   c_gid	6
    39	   c_nlink	6
    40	   c_rdev	6		only valid for chr and blk special files
    41	   c_mtime	11
    42	   c_namesize	6		count includes terminating NUL in pathname
    43	   c_filesize	11		must be 0 for FIFOs and directories  */
    44	
    45	/* Value for the field `c_magic'.  */
    46	#define MAGIC	"070707"
    47	
    48	/* Values for c_mode, OR'd together: */
    49	
    50	#define C_IRUSR		000400
    51	#define C_IWUSR		000200
    52	#define C_IXUSR		000100
    53	#define C_IRGRP		000040
    54	#define C_IWGRP		000020
    55	#define C_IXGRP		000010
    56	#define C_IROTH		000004
    57	#define C_IWOTH		000002
    58	#define C_IXOTH		000001
    59	
    60	#define C_ISUID		004000
    61	#define C_ISGID		002000
    62	#define C_ISVTX		001000
    63	
    64	#define C_ISBLK		060000
    65	#define C_ISCHR		020000
    66	#define C_ISDIR		040000
    67	#define C_ISFIFO	010000
    68	#define C_ISSOCK	0140000
    69	#define C_ISLNK		0120000
    70	#define C_ISCTG		0110000
    71	#define C_ISREG		0100000
    72	
    73	#endif /* cpio.h */