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Attempt to improve application portability by marking `struct ar_hdr'

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as `packed'.

The C standard leaves the alignment of individual members of a C
struct upto the implementation, so pedantically speaking portable
code cannot assume that the layout of a `struct ar_hdr' in memory
will match its layout in a file.  Using a __packed attribute
declaration forces file and memory layouts for this structure to
match.

Submitted by:	ru
This commit is contained in:
Joseph Koshy 2006-11-13 04:28:29 +00:00
parent 80ca751b22
commit 9e1ea8f2fe
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=164244
1 changed files with 5 additions and 1 deletions
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6
include/ar.h
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@ -39,11 +39,15 @@
* SUCH DAMAGE. * SUCH DAMAGE.
* *
* @(#)ar.h 8.2 (Berkeley) 1/21/94 * @(#)ar.h 8.2 (Berkeley) 1/21/94
*
* $FreeBSD$
*/ */
#ifndef _AR_H_ #ifndef _AR_H_
#define _AR_H_ #define _AR_H_
#include <sys/cdefs.h>
/* Pre-4BSD archives had these magic numbers in them. */ /* Pre-4BSD archives had these magic numbers in them. */
#define OARMAG1 0177555 #define OARMAG1 0177555
#define OARMAG2 0177545 #define OARMAG2 0177545
@ -62,6 +66,6 @@ struct ar_hdr {
char ar_size[10]; /* size in bytes */ char ar_size[10]; /* size in bytes */
#define ARFMAG "`\n" #define ARFMAG "`\n"
char ar_fmag[2]; /* consistency check */ char ar_fmag[2]; /* consistency check */
}; } __packed;
#endif /* !_AR_H_ */ #endif /* !_AR_H_ */