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ar(5) [ultrix man page]

ar(5)								File Formats Manual							     ar(5)

Name
       ar - archive (library) file format

Syntax
       #include <ar.h>

Description
       The archive command, combines several files into one.  Archives are used mainly as libraries to be searched by the link-editor,

       A  file	produced  by has a magic string at the start, followed by the constituent files, each preceded by a file header.  The magic number
       and header layout as described in the include file are:
       #define ARMAG  "!<arch>
"
       #define SARMAG 8

       #define ARFMAG "`
"

       struct ar_hdr {
	       char   ar_name[16];
	       char   ar_date[12];
	       char   ar_uid[6];
	       char   ar_gid[6];
	       char   ar_mode[8];
	       char   ar_size[10];
	       char   ar_fmag[2];
       };

       The name is a blank-padded string.  The ar_fmag field contains ARFMAG to help verify the presence of a header.  The other fields are  left-
       adjusted, blank-padded numbers.	They are decimal except for ar_mode, which is octal.  The date is the modification date of the file at the
       time of its insertion into the archive.

       Each file begins on an even (0 mod 2) boundary; a new-line is inserted between files if necessary.  The size given reflects the actual size
       of the file exclusive of padding.

       Provisions are not made for empty areas in an archive file.

       The encoding of the header is portable across machines.	If an archive contains printable files, the archive itself is printable.

Restrictions
       A filename loses trailing blanks.  Most software dealing with archives takes an included blank as a name terminator.

See Also
       ar(1), ld(1), nm(1)

								       RISC								     ar(5)

Check Out this Related Man Page

AR(6)								   Games Manual 							     AR(6)

NAME
ar - archive (library) file format SYNOPSIS
#include <ar.h> DESCRIPTION
The archive command ar(1) is used to combine several files into one. Archives are used mainly as libraries to be searched by the loaders 2l(1) et al. A file produced by ar has a magic string at the start, followed by the constituent files, each preceded by a file header. The magic number and header layout as described in the include file are: #define ARMAG "!<arch> " #define SARMAG 8 #define ARFMAG "` " struct ar_hdr { char name[16]; char date[12]; char uid[6]; char gid[6]; char mode[8]; char size[10]; char fmag[2]; }; #define SAR_HDR 60 The name is a blank-padded string. The field contains to help verify the presence of a header. The other fields are left-adjusted, blank- padded numbers. They are decimal except for which is octal. The date is the modification date of the file (see stat(2)) at the time of its insertion into the archive. The mode is the low 9 bits of the file permission mode. The length of the header is Because the structure is padded in an architecture-dependent manner, the structure should never be read or written as a unit; instead, each field should be read or written independently. Each file begins on an even (0 mod 2) boundary; a newline is inserted between files if necessary. Nevertheless size reflects the actual size of the file exclusive of padding. When all members of an archive are object files of the same architecture, ar automatically adds an extra file, named __.SYMDEF, as the first member of the archive. This file contains an index used by the loaders to locate all externally defined text and data symbols in the archive. There is no provision for empty areas in an archive file. SEE ALSO
ar(1), 2l(1), nm(1), stat(2) BUGS
The uid and gid fields are unused in Plan 9. They provide compatibility with Unix ar format. AR(6)
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