1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
/*
* int_ghba_r.c:
* Test program to see whether gethostbyaddr_r takes 8 arguments and returns
* int.
*/
static const char rcsid[] = "$Id$";
#include <sys/socket.h>
#include <sys/types.h>
#include <errno.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <netinet/in.h>
int main(void) {
struct in_addr localhost;
struct hostent hostbuf, *hp;
char *buf;
int res, herr;
size_t buflen = 1024;
localhost.s_addr = htonl(INADDR_LOOPBACK);
buf = malloc(buflen);
while ((res = gethostbyaddr_r((char*)&localhost, sizeof localhost, AF_INET,
&hostbuf, buf, buflen, &hp, &herr))
== ERANGE)
buf = (char*)realloc(buf, buflen *= 2);
/* We assume that the loopback address can always be resolved if
* gethostbyaddr_r is actually working. */
if (res || hp == NULL) {
fprintf(stderr, "errno = %d, herr = %d, res = %d\n", errno, herr, res);
return -1;
} else
return 0;
}
|
