ARCHIVES.H man page on SmartOS

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ARCHIVES.H(3HEAD)					     ARCHIVES.H(3HEAD)

NAME
       archives.h, archives - device header

DESCRIPTION
	 /* Magic numbers */
	 #define CMN_ASC 0x070701    /* Cpio Magic Number for -c header */
	 #define CMN_BIN 070707	     /* Cpio Magic Number for Binary header */
	 #define CMN_BBS 0143561     /* Cpio Magic Number for Byte-Swap header */
	 #define CMN_CRC 0x070702    /* Cpio Magic Number for CRC header */
	 #define CMS_ASC "070701"    /* Cpio Magic String for -c header */
	 #define CMS_CHR "070707"    /* Cpio Magic String for odc header */
	 #define CMS_CRC "070702"    /* Cpio Magic String for CRC header */
	 #define CMS_LEN 6	     /* Cpio Magic String length */
	 /* Various header and field lengths */
	 #define CHRSZ	 76	    /* -H odc size minus filename field */
	 #define ASCSZ	 110	    /* -c and CRC hdr size minus filename field */
	 #define TARSZ	 512	    /* TAR hdr size */
	 #define HNAMLEN 256	    /* maximum filename length for binary and
				   odc headers */
	 #define EXPNLEN 1024	   /* maximum filename length for -c and
				  CRC headers */
	 #define HTIMLEN 2	   /* length of modification time field */
	 #define HSIZLEN 2	   /* length of file size field */
	 /* cpio binary header definition */
	 struct hdr_cpio {
		short	h_magic,	   /* magic number field */
			h_dev;		   /* file system of file */
		ushort_t  h_ino,	   /* inode of file */
			h_mode,		   /* modes of file */
			h_uid,		   /* uid of file */
			h_gid;		   /* gid of file */
		short	h_nlink,	   /* number of links to file */
			h_rdev,		   /* maj/min numbers for special files */
			h_mtime[HTIMLEN],  /* modification time of file */
			h_namesize,	   /* length of filename */
		   h_filesize[HSIZLEN];	    /* size of file */
	      char h_name[HNAMLEN];    /* filename */
	 } ;
	 /* cpio -H odc header format */
	 struct c_hdr {
		char c_magic[CMS_LEN],
		     c_dev[6],
		     c_ino[6],
		     c_mode[6],
		     c_uid[6],
		     c_gid[6],
		     c_nlink[6],
		     c_rdev[6],
		     c_mtime[11],
		     c_namesz[6],
		     c_filesz[11],
		     c_name[HNAMLEN];
	 } ;
	 /* -c and CRC header format */
	 struct Exp_cpio_hdr {
	      char E_magic[CMS_LEN],
		   E_ino[8],
		   E_mode[8],
		   E_uid[8],
		   E_gid[8],
		   E_nlink[8],
		   E_mtime[8],
		   E_filesize[8],
		   E_maj[8],
		   E_min[8],
		   E_rmaj[8],
		   E_rmin[8],
		   E_namesize[8],
		   E_chksum[8],
		   E_name[EXPNLEN];
	 } ;
	 /* Tar header structure and format */
	 #define TBLOCK 512  /* length of tar header and data blocks */
	 #define TNAMLEN     100  /* maximum length for tar file names */
	 #define TMODLEN     8	  /* length of mode field */
	 #define TUIDLEN     8	  /* length of uid field */
	 #define TGIDLEN     8	  /* length of gid field */
	 #define TSIZLEN     12	  /* length of size field */
	 #define TTIMLEN     12	  /* length of modification time field */
	 #define TCRCLEN     8	  /* length of header checksum field */
	 /* tar header definition */
	 union tblock {
	      char dummy[TBLOCK];
	      struct header {
		  char	t_name[TNAMLEN];     /* name of file */
		  char	t_mode[TMODLEN];     /* mode of file */
		  char	t_uid[TUIDLEN];	     /* uid of file */
		  char	t_gid[TGIDLEN];	     /* gid of file */
		  char	t_size[TSIZLEN];     /* size of file in bytes */
		  char	t_mtime[TTIMLEN];    /* modification time of file */
		  char	t_chksum[TCRCLEN];   /* checksum of header */
		  char	t_typeflag;	     /* flag to indicate type of file */
		  char	t_linkname[TNAMLEN]; /* file this file is linked with */
		  char	t_magic[6];	     /* magic string always "ustar" */
		  char	t_version[2];	     /* version strings always "00" */
		  char	t_uname[32];	     /* owner of file in ASCII */
		  char	t_gname[32];	     /* group of file in ASCII */
		  char	t_devmajor[8];	     /* major number for special files */
		  char	t_devminor[8];	     /* minor number for special files */
		  char	t_prefix[155];	     /* pathname prefix */
	      } tbuf;
	 }
	 /* volcopy tape label format and structure */
	 #define VMAGLEN 8
	 #define VVOLLEN     6
	 #define VFILLEN     464
	 struct volcopy_label {
	      char v_magic[VMAGLEN],
		   v_volume[VVOLLEN],
		   v_reels,
		   v_reel;
	      long v_time,
		   v_length,
		   v_dens,
		   v_reelblks,	  /* u370 added field */
		   v_blksize,	  /* u370 added field */
		   v_nblocks;	  /* u370 added field */
	      char v_fill[VFILLEN];
	      long v_offset; /* used with -e and -reel options */
	      int  v_type;	  /* does tape have nblocks field? */
	 } ;

	 /*
	  * Define archive formats for extended attributes.
	  *
	  * Extended attributes are stored in two pieces.
	  * 1. An attribute header which has information about
	  *    what file the attribute is for and what the attribute
	  *    is named.
	  * 2. The attribute record itself.  Stored as a normal file type
	  *    of entry.
	  * Both the header and attribute record have special modes/typeflags
	  * associated with them.
	  *
	  * The names of the header in the archive look like:
	  * /dev/null/attr.hdr
	  *
	  * The name of the attribute looks like:
	  * /dev/null/attr.
	  *
	  * This is done so that an archiver that doesn't understand these formats
	  * can just dispose of the attribute records unless the user chooses to
	  * rename them via cpio -r or pax -i
	  *
	  * The format is composed of a fixed size header followed
	  * by a variable sized xattr_buf. If the attribute is a hard link
	  * to another attribute, then another xattr_buf section is included
	  * for the link.
	  *
	  * The xattr_buf is used to define the necessary "pathing" steps
	  * to get to the extended attribute.  This is necessary to support
	  * a fully recursive attribute model where an attribute may itself
	  * have an attribute.
	  *
	  * The basic layout looks like this.
	  *
	 *     --------------------------------
	  *	|			       |
	  *	|	  xattr_hdr	       |
	  *	|			       |
	  *	--------------------------------
	  *	--------------------------------
	  *	|			       |
	  *	|	 xattr_buf	       |
	  *	|			       |
	  *	--------------------------------
	  *	--------------------------------
	  *	|			       |
	  *	|      (optional link info)    |
	  *	|			       |
	  *	--------------------------------
	  *	--------------------------------
	  *	|			       |
	  *	|      attribute itself	       |
	  *	|      stored as normal tar    |
	  *	|      or cpio data with       |
	  *	|      special mode or	       |
	  *	|      typeflag		       |
	  *	|			       |
	  *	--------------------------------
	  *
	  */
	 #define XATTR_ARCH_VERS "1.0"

	 /*
	  * extended attribute fixed header
	  *
	  * h_version		 format version.
	  * h_size		 size of header + variable sized data sections.
	  * h_component_len	 Length of entire pathing section.
	  * h_link_component_len Length of link component section.  Again same
	  *			 definition as h_component_len.
	  */
	 struct xattr_hdr {
		 char	 h_version[7];
		 char	 h_size[10];
		 char	 h_component_len[10]; /* total length of path component */
		 char	 h_link_component_len[10];
	 };

	 /*
	  * The name is encoded like this:
	  * filepathNULattrpathNUL[attrpathNULL]...
	  */
	 struct xattr_buf {
		 char	 h_namesz[7];  /* length of h_names */
		 char	 h_typeflag;   /* actual typeflag of file being archived */
		 char	 h_names[1];   /* filepathNULattrpathNUL... */
	 };

	 /*
	  * Special values for tar archives
	  */

	 /*
	  * typeflag for tar archives.
	  */

	 /*
	  * Attribute hdr and attribute files have the following typeflag
	  */
	 #define _XATTR_HDRTYPE		 'E'

	 /*
	  * For cpio archives the header and attribute have
	  * _XATTR_CPIO_MODE ORED into the mode field in both
	  * character and binary versions of the archive format
	  */
	 #define _XATTR_CPIO_MODE	 0xB000

				 Oct 22, 2007		     ARCHIVES.H(3HEAD)
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