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#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <sys/types.h>
#include <sys/select.h>
#define SERV_ADDR "127.0.0.1"
#define SERV_PORT 5358
#define BUF_LEN 1024
#define MAX(a, b) (a)>(b)?(a):(b)
ssize_t writen(int fd, const void *vptr, size_t n)
{
size_t nleft;
ssize_t nwriten;
const char *ptr;
ptr = vptr;
nleft = n;
while(nleft>0) {
if((nwriten = write(fd, ptr, nleft)) <= 0) {
if(nwriten < 0 && errno == EINTR) {
nwriten = 0; /*interrupt by signal*/
} else {
return -1;
}
}
nleft -= nwriten;
ptr += nwriten;
}
return n;
}
void str_cli(FILE *fp, int sockfd)
{
int maxfdp;
fd_set rset;
char sendbuf[BUF_LEN] = {0};
char recvbuf[BUF_LEN] = {0};
FD_ZERO(&rset);
while(1) {
FD_SET(fileno(fp), &rset);
FD_SET(sockfd, &rset);
maxfdp = MAX(fileno(fp), sockfd) + 1;
select(maxfdp, &rset, NULL, NULL, NULL);
if(FD_ISSET(sockfd, &rset)) {
if(read(sockfd, recvbuf, BUF_LEN) == 0) { //if the length of the data in kernal buffer > 1024 ?
printf("EOF\n");
exit(0);
} else {
fputs(recvbuf, stdout);
}
}
if(FD_ISSET(fileno(fp), &rset)) {
if(fgets(sendbuf, BUF_LEN, fp) == NULL) {
return;
}
writen(sockfd, sendbuf, strlen(sendbuf));
}
bzero(sendbuf, BUF_LEN);
bzero(recvbuf, BUF_LEN);
}
return;
}
int main(int argc, char **argv)
{
int fd;
struct sockaddr_in servaddr;
fd = socket(AF_INET, SOCK_STREAM, 0);
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = inet_addr(SERV_ADDR);
servaddr.sin_port = htons(SERV_PORT);
if (connect(fd, (struct sockaddr *)&servaddr, sizeof(servaddr)) == -1) {
printf("connect error: %s\n", strerror(errno));
return 0;
}
str_cli(stdin, fd);
return 0;
}
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