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archives.h(3head)

archives.h(3HEAD)                   Headers                  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






Oracle Solaris 11.4               1 Aug 2011                 archives.h(3HEAD)
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