/*
* getaddrinfo ( 3 ) ( name - > address lookup ) tester .
*
* Compile with :
*
* cc - o getaddrinfo getaddrinfo . c ( BSD , Linux )
*
* cc - o getaddrinfo getaddrinfo . c - lsocket - lnsl ( SunOS 5 . x )
*
* Run as : getaddrinfo hostname
*
* Author : Wietse Venema , Eindhoven University of Technology , The Netherlands .
*
* Author : Wietse Venema , IBM T . J . Watson Research , USA .
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, char **argv)
{
char hostbuf[NI_MAXHOST]; /* XXX */
struct addrinfo hints;
struct addrinfo *res0;
struct addrinfo *res;
const char *addr;
int err;
#define NO_SERVICE ((char *) 0 )
if (argc != 2 ) {
fprintf(stderr, "usage: %s hostname\n" , argv[0 ]);
exit (1 );
}
memset((char *) &hints, 0 , sizeof (hints));
hints.ai_family = PF_UNSPEC;
hints.ai_flags = AI_CANONNAME;
hints.ai_socktype = SOCK_STREAM;
if ((err = getaddrinfo(argv[1 ], NO_SERVICE, &hints, &res0)) != 0 ) {
fprintf(stderr, "host %s not found: %s\n" , argv[1 ], gai_strerror(err));
exit (1 );
}
printf("Hostname:\t%s\n" , res0->ai_canonname);
printf("Addresses:\t" );
for (res = res0; res != 0 ; res = res->ai_next) {
addr = (res->ai_family == AF_INET ?
(char *) &((struct sockaddr_in *) res->ai_addr)->sin_addr :
(char *) &((struct sockaddr_in6 *) res->ai_addr)->sin6_addr);
if (inet_ntop(res->ai_family, addr, hostbuf, sizeof (hostbuf)) == 0 ) {
perror("inet_ntop:" );
exit (1 );
}
printf("%s " , hostbuf);
}
printf("\n" );
freeaddrinfo(res0);
exit (0 );
}
Messung V0.5 in Prozent C=88 H=88 G=87
¤ Dauer der Verarbeitung: 0.9 Sekunden
(vorverarbeitet am 2026-08-08)
¤
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