ar.h Header File ar.h
Format for archive files
#include <ar.h>
An archive is a file that has been built from a number of files.
Archives are maintained by the ar command. Usually, an archive
is a library of object files used by the linker ld.
The header ar.h describes the format of an archive. All archives
start with a magic number ARMAG, which identifies the file as an
archive. The members of the archive follow the magic number,
each preceded by the structure ar_hdr:
#define DIRSIZ 14 /* from <dir.h> */
#define ARMAG 0177535 /* magic number */
struct ar_hdr {
char ar_name[DIRSIZ]; /* member name */
time_t ar_date; /* time inserted */
short ar_gid; /* group owner */
short ar_uid; /* user owner */
short ar_mode; /* file mode */
size_t ar_size; /* file size */
};
The structure at the head of each member is immediately followed
by ar_size bytes, which are the data of the file.
To enhance the performance of ld, the command ranlib provides a
random library facility. ranlib produces archives that contain a
special entry named _ _.SYMDEF at the beginning.
All integer members of the structure (everything but ar_name) are
in canonical form to ease portability. See canon.h for more in-
formation.
***** See Also *****
ar, canon.h, header files, ld, ranlib
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