projects / unix-history / blame
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1 | .\" @(#)cpioformat.5 5.2 (Berkeley) %G% |
| 2 | .\" | |
| 3 | .TH CPIO 5 "" | |
| 4 | .UC 7 | |
| 5 | .SH NAME | |
| 1b927a87 | 6 | cpio - format of cpio archive |
| d012942d | 7 | .SH DESCRIPTION |
| 1b927a87 | 8 | The header structure, when the -c option of cpio(1) is not used, is: |
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9 | .sp 1 |
| 10 | .nf | |
| 11 | struct { | |
| 12 | short h_magic, | |
| 13 | h_dev; | |
| 14 | ushort h_ino, | |
| 15 | h_mode, | |
| 16 | h_uid, | |
| 17 | h_gid; | |
| 18 | short h_nlink, | |
| 19 | h_rdev, | |
| 20 | h_mtime[2], | |
| 21 | h_namesize, | |
| 22 | h_filesize[2]; | |
| 23 | char h_name[h_namesize rounded to word]; | |
| 24 | } Hdr; | |
| 25 | .sp 2 | |
| 26 | When the -c option is used, the header information is described by: | |
| 1b927a87 | 27 | .sp |
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28 | sscanf(Chdr,"%6o%6o%6o%6o%6o%6o%6o%6o%11lo%6o%11lo%s", |
| 29 | &Hdr.h_magic, &Hdr.h_dev, &Hdr.h_ino, &Hdr.h_mode, | |
| 30 | &Hdr.h_uid, &Hdr.h_gid, &Hdr.h_nlink, &Hdr.h_rdev, | |
| 31 | &Longtime, &Hdr.h_namesize,&Longfile,Hdr.h_name); | |
| 32 | .fi | |
| 1b927a87 | 33 | .sp |
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34 | Longtime and Longfile are equivalent to Hdr.h_mtime and |
| 35 | Hdr.h_filesize, respectively. The contents of each file are | |
| 36 | recorded in an element of the array of varying lenght | |
| 37 | structures, archive, together with other items describing | |
| 38 | the file. Every instance of h_magic contains the constant | |
| d012942d | 39 | 070707 (octal). The itimes h_dev through h_mtime have |
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40 | meanings explained in stat(2). The length of the null- |
| 41 | terminated path name H_name, icluding the null byte, is | |
| 42 | given by h_namesize. | |
| 43 | .sp | |
| 44 | The last record of the archive always contains the name | |
| 45 | TRAILER!!!. Special files, directories, and the trailer are | |
| 46 | recorded with H_filesize equal to zero. | |
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47 | .SH SEE ALSO |
| 48 | cpio(1), find(1), stat(2) |