//server
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define SIZE sizeof(struct sockaddr_in)
void catcher(int sig);
int newsockfd;
int main()
{
int sockfd;
char c;
struct sockaddr_in server = { AF_INET, 7000, INADDR_ANY };
static struct sigaction act;
act.sa_handler = catcher;
sigfillset(&(act.sa_mask));
sigaction(SIGPIPE, &act, NULL);
/* set up the transport end point */
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1){
perror(“socket call failed”);
exit(1);
}
/*bind an address to the end point */
if (bind(sockfd, (struct sockaddr *)&server, SIZE) == -1){
perror(“bind call failed”);
exit(1);
}
/* start listening for incoming connection*/
if (listen(sockfd, 5) == -1 ){
perror(“listen call failed”);
exit(1);
}
for (;;){
/* accept a connection */
if ((newsockfd = accept(sockfd, NULL, NULL)) == -1){
perror(“accept call failed”);
continue;
}
/* spawn a child do deal with the connection */
if (fork() == 0)
{
while (recv(newsockfd, &c, 1, 0) > 0){
c = toupper(c);
send(newsockfd, &c, 1, 0);
}
close(newsockfd);
exit(0);
}
close(newsockfd);
}
}
void catcher(int sig){
close(newsockfd);
exit(0);
}