chat_clnt.c

#include <stdio.h>
#include <pthread.h>
#include <string.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <unistd.h>
#include <arpa/inet.h>

#define BUF_SIZE 100
#define NAME_SIZE 20

void * send_msg(void *arg);
void * recv_msg(void *arg);
void error_handling(char *msg);

char name[NAME_SIZE] = "[DEFAULT]";
char msg[BUF_SIZE];

int main(int argc, char const *argv[])
{
	int sock;
	struct sockaddr_in serv_addr;
	pthread_t snd_thread, rcv_thread;
	void * thread_return;

	if (argc != 4)
	{
		printf("Usage: %s <IP> <PORT> <name> \n", argv[0]);
		exit(1);
	}

	sprintf(name, "[%s]",argv[3]);
	sock = socket(PF_INET, SOCK_STREAM, 0);

	memset(&serv_addr, 0, sizeof(serv_addr));
	serv_addr.sin_family = AF_INET;
	if(!inet_aton(argv[1],&serv_addr.sin_addr))
		error_handling("convert err");
	serv_addr.sin_port = htons(atoi(argv[2]));

	if(connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) == -1)
		error_handling("connect err");

	pthread_create(&snd_thread, NULL, send_msg, (void*)&sock);
	pthread_create(&rcv_thread, NULL, recv_msg, (void*)&sock);
	pthread_join(snd_thread, &thread_return);
	pthread_join(rcv_thread, &thread_return);
	close(sock);
	return 0;
}

void * send_msg(void * arg)//send thread main
{
	int sock = *((int *)arg);
	char name_msg[NAME_SIZE+BUF_SIZE];

	while(1)
	{
		fgets(msg, BUF_SIZE, stdin);
		if(!strcmp(msg,"q\n") || !strcmp(msg,"Q\n"))
		{
			close(sock);
			exit(0);
		}
		sprintf(name_msg, "%s %s",name, msg);
		write(sock, name_msg,strlen(name_msg));
	}
	return NULL;
}

void *recv_msg(void *arg)
{
	int sock = *((int*)arg);
	char name_msg[NAME_SIZE+BUF_SIZE];
	int str_len;

	while(1)
	{
        str_len = read(sock,name_msg,NAME_SIZE+BUF_SIZE-1);
        if(str_len == -1)
        	return (void*)-1;
        name_msg[str_len] = 0;
        fputs(name_msg,stdout);
	}
	return NULL;
}

void error_handling(char *message)
{
	fputs(message, stderr);
	fputc('\n', stderr);
	exit(1);
}