The following is an example from R Stevens book "UNP". I am having difficulties
with the code shown below.
When I try to compile it using......
gcc tcp_connect.c -lsocket -lnsl -lresolv -lc
I get the following error messages....
baja{shroff}% gcc tcp_connect.c -lsocket -lnsl -lresolv -lc
tcp_connect.c: In function `tcp_connect':
tcp_connect.c:38: storage size of `hints' isn't known
tcp_connect.c:40: sizeof applied to an incomplete type
tcp_connect.c:53: dereferencing pointer to incomplete type
tcp_connect.c:53: dereferencing pointer to incomplete type
tcp_connect.c:53: dereferencing pointer to incomplete type
tcp_connect.c:56: dereferencing pointer to incomplete type
tcp_connect.c:56: dereferencing pointer to incomplete type
tcp_connect.c:61: dereferencing pointer to incomplete type
I think these errors are due to the use of getaddrinfo. I am very new to socket
programming. I'll be greatful if someone can tell me where i am going wrong.
Thanks a lot,
Chirag
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <time.h>
#include <fcntl.h>
#include <errno.h>
//#include "addrinfo.h"
#define ERROR -1
#define OK 1
#define TRUE 1
/********************************************************************************
* tcp_connect - client task
*
*
* RETURNS: OK or ERROR
*/
int tcp_connect (const char *host, const char *serv) {
int sockfd, n;
struct addrinfo hints, *res, *ressave;
bzero (&hints, sizeof (struct addrinfo));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
if ((n = getaddrinfo (host, serv, &hints, &res)) != 0) {
printf ("tcp_connect error for %s, %s: %s\n\n",host,serv,gai_strerror(n));
return ERROR;
}
ressave = res;
do {
if((sockfd=socket (res->ai_family,res->ai_socktype,res->ai_protocol))<0)
continue;
if (connect (sockfd, res->ai_addr, res->ai_addrlen) == 0)
break; // connected.
close (sockfd); // connect was not successful, so ignore this socket.
} while ((res = res->ai_next) != NULL);
if (res == NULL) { // connection could not be established.
printf ("tcp_connect error for %s, %s", host,serv);
return ERROR;
}
freeaddrinfo (ressave);
return (sockfd);
}
int main () {
tcp_connect ("140.252.7.10", "daytime");
exit (0);
}
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