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chat_server.c
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chat_server.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <pthread.h>
#include <semaphore.h>
#define BUF_SIZE 100
#define MAX_CLNT 256
void *handle_clnt(void *arg);
void send_msg(char *msg, int len);
void error_handing(char *msg);
int clnt_cnt = 0;
int clnt_socks[MAX_CLNT];
pthread_mutex_t mutx;
int main(int argc, char **argv)
{
int serv_sock, clnt_sock;
struct sockaddr_in serv_addr, clnt_addr;
socklen_t clnt_adr_sz;
pthread_t t_id;
if (argc != 2) {
printf("Usage: %s <PORT> \n", argv[1]);
exit(1);
}
pthread_mutex_init(&mutx, NULL);
serv_sock = socket(AF_INET, SOCK_STREAM, 0);
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
serv_addr.sin_port = htons(atoi(argv[1]));
if (bind(serv_sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) == -1) {
error_handing("bind() error");
}
if (listen(serv_sock, 5) == -1) {
error_handing("listen() error");
}
while (1) {
clnt_adr_sz = sizeof(clnt_addr);
clnt_sock = accept(serv_sock, (struct sockaddr *)&clnt_addr, &clnt_adr_sz);
pthread_mutex_lock(&mutx);
clnt_socks[clnt_cnt++] = clnt_sock;
pthread_mutex_unlock(&mutx);
pthread_create(&t_id, NULL, handle_clnt, (void *)&clnt_sock);
pthread_detach(t_id);
printf("Connected client IP: %s \n", inet_ntoa(clnt_addr.sin_addr));
}
close(serv_sock);
return 0;
}
void *handle_clnt(void *arg)
{
int clnt_sock = *((int *)arg);
int str_len = 0, i;
char msg[BUF_SIZE];
while ((str_len = read(clnt_sock, msg, BUF_SIZE)) != 0) {
send_msg(msg, str_len);
}
pthread_mutex_lock(&mutx);
for (i = 0; i < clnt_cnt; i++) {
if (clnt_sock == clnt_socks[i]) {
while (i++ < clnt_cnt - 1)
clnt_socks[i] = clnt_socks[i+1];
break;
}
}
clnt_cnt--;
pthread_mutex_unlock(&mutx);
close(clnt_sock);
return NULL;
}
void send_msg(char *msg, int len)
{
int i;
pthread_mutex_lock(&mutx);
for (i = 0; i < clnt_cnt; i++) {
write(clnt_socks[i], msg, len);
}
pthread_mutex_unlock(&mutx);
}
void error_handing(char *msg)
{
fputs(msg, stderr);
fputc('\n', stderr);
exit(1);
}