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linuxServer.c
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linuxServer.c
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#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
void interact(int);
int main(int argc, char *argv[])
{
int sockfd, newsockfd, portno, clilen, pid;
struct sockaddr_in serv_addr, cli_addr;
if(argc < 2)
{
fprintf(stderr, "No port input.\n");
exit(1);
}
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if(sockfd < 0)
{
fprintf(stderr, "Can't open socket.\n");
exit(1);
}
bzero((char *) &serv_addr, sizeof(serv_addr));
portno = atoi(argv[1]);
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno);
if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
{
fprintf(stderr, "Can't bind.\n");
exit(1);
}
listen(sockfd,5);
clilen = sizeof(cli_addr);
while(1)
{
newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
if(newsockfd < 0)
{
fprintf(stderr, "Couldn't accept.\n");
exit(1);
}
pid = fork();
if(pid != 0)
{
close(newsockfd);
}
else
{
close(sockfd);
interact(newsockfd);
exit(0);
}
}
return 0;
}
void interact(int socket)
{
while(1)
{
int n;
char buffer[256];
bzero(buffer, 256);
n = read(socket, buffer, 255);
if(n < 0)
{
fprintf(stderr, "Error reading from socket.\n");
exit(1);
}
else
{
printf("Message: %s\n", buffer);
n = write(socket, "I got your message", 18);
}
}
}