guys, ive copied a code about socket programming just to see how it runs. problem is i cant compile it everytime i compile client.c it shows and error. here is the error
client.c: In function ‘error’:
client.c:9: warning: incompatible implicit declaration of built-in function ‘exit’
client.c: In function ‘main’:
client.c:19: warning: incompatible implicit declaration of built-in function ‘exit’
client.c:28: warning: incompatible implicit declaration of built-in function ‘exit’
client.c:30: warning: incompatible implicit declaration of built-in function ‘bzero’
client.c:32: warning: incompatible implicit declaration of built-in function ‘bcopy’
client.c:37: warning: passing argument 2 of ‘connect’ from incompatible pointer type
client.c:42: warning: incompatible implicit declaration of built-in function ‘strlen’here is the code for client.c
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
void error(char *msg)
{
perror(msg);
exit(0);
}
int main(int argc, char *argv[])
{
int sockfd, portno, n;
struct sockaddr_in serv_addr;
struct hostent *server;
char buffer[256];
if (argc < 3) {
fprintf(stderr,"usage %s hostname port\n", argv[0]);
exit(0);
}
portno = atoi(argv[2]);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
server = gethostbyname(argv[1]);
if (server == NULL) {
fprintf(stderr,"ERROR, no such host\n");
exit(0);
}
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
bcopy((char *)server->h_addr,
(char *)&serv_addr.sin_addr.s_addr,
server->h_length);
serv_addr.sin_port = htons(portno);
if (connect(sockfd,&serv_addr,sizeof(serv_addr)) < 0)
error("ERROR connecting");
printf("Please enter the message: ");
bzero(buffer,256);
fgets(buffer,255,stdin);
n = write(sockfd,buffer,strlen(buffer));
if (n < 0)
error("ERROR writing to socket");
bzero(buffer,256);
n = read(sockfd,buffer,255);
if (n < 0)
error("ERROR reading from socket");
printf("%s\n",buffer);
return 0;
}can anybody please clarify how to properly compile this program? thanks
