hi everyone.Code:#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <unistd.h>
#define PORT 9017
#define BUFFER 1024
#define MAXUSERS 10
int main(int argc, char* argv[])
{
int sockfd, newfd;
struct sockaddr_in myaddr;
struct sockaddr_in theiraddr;
int port = -1;
char* buffer = malloc(BUFFER);
int addrlen;
int maxfd;
if (argc > 1)
{
int i;
for (i = 0; i < 2; i++)
{
if (strncmp(argv[i], "-p", 2) == 0)
port = atoi(argv[i + 1]);
if (strncmp(argv[i], "-h", 2) == 0)
{
fprintf(stderr, "\nUsage: echoserv -p <port> -h\n");
fprintf(stderr, "-p <port> sets the port that host server\n");
fprintf(stderr, "-h prints this help screen\n\n");
exit(EXIT_FAILURE);
}
}
}
if (port == -1)
port = PORT;
printf("\n***ECHOSERV v0.0.2***\n");
printf("***Port is: %d***\n\n", port);
fd_set master;
fd_set slave;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
myaddr.sin_family = AF_INET;
myaddr.sin_port = htons(port);
myaddr.sin_addr.s_addr = INADDR_ANY;
bind(sockfd, (struct sockaddr *)&myaddr, sizeof(struct sockaddr));
listen(sockfd, MAXUSERS);
FD_ZERO(&master);
FD_ZERO(&slave);
FD_SET(sockfd, &master);
maxfd = sockfd;
int i;
int data;
for( ; ; )
{
slave = master;
select(maxfd + 1, &slave, NULL, NULL, NULL);
for (i = 0; i <= maxfd; i++)
{
if (FD_ISSET(i, &slave)) /
{
if (i == sockfd)
{
addrlen = sizeof(theiraddr);
newfd = accept (sockfd, (struct sockaddr *)&theiraddr, &addrlen);
}
else
{
FD_SET(newfd, &master);
if (newfd > maxfd)
maxfd = newfd;
}
}
else
{
data = recv(i, buffer, sizeof(buffer), 0);
if (data <= 0) //disconnection or error
{
printf("not good here!\n");
FD_CLR(i, &master); close(i);
}
else
{
send(i, buffer, sizeof(buffer), 0);
}
}
}
}
close(newfd);
close(sockfd);
free(buffer);
return 0;
}
this code (an echo server) is giving me some problems. "not good here" gets printed the first time a connection is received and no data gets send()'t . i have worked with sockets before but not with select().
thx for help