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gethostbyname问题!
main(int argc, const char **argv)
{
ulong_t addr;
struct hostent *hp;
char **p;
if (argc != 2) {
(void) printf("usage: %s IP-address\n", argv[0]);
exit (1);
}
if ((int)(addr = inet_addr(argv[1])) == -1) {
(void) printf("IP-address must be of the form a.b.c.d\n"
exit (2);
}
hp = gethostbyaddr((char *)&addr, sizeof (addr), AF_INET);
if (hp == NULL) {
(void) printf("host information for %s not found\n", argv[1]);
exit (3);
}
for (p = hp->;h_addr_list; *p != 0; p++) {
struct in_addr in;
char **q;
(void) memcpy(&in.s_addr, *p, sizeof (in.s_addr));
(void) printf("%s\t%s", inet_ntoa(in), hp->;h_name);
for (q = hp->;h_aliases; *q != 0; q++)
(void) printf(" %s", *q);
(void) putchar('\n');
}
exit (0);
} |
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