Lan Qing wrote:
hello,
I read the fllowing words in the c header file <netinet/in.h>
I.e., the header that came with your OS, not the header that comes with
tcpdump?
/* Internet address. */
typedef uint32_t in_addr_t;
struct in_addr
{
in_addr_t s_addr;
};"
the struct in_addr have only one variable in it, is there any necessary to
define a struct like that?
why not use "typedef in_addr_t in_addr;" directly?
In BSD, it was originally a union that also included arrays of bytes so
that code could look at the bytes, for dealing with class A, B, and C
Internet addresses - as the comment in OS X, and other BSDs, says, it's
"a structure for historical reasons", because code depended on there
being an "s_addr" member (which was one of the members of the union).
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