FIFO로 server client간 데이터 주고 받기

1. Server

#include <stdio.h>
#include <unistd.h>
#include <sys/times.h>
#include <limits.h>
#include <stdlib.h>
#include <time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <string.h>
#include <fcntl.h>

int main() {
    int pd, n;
    char msg[] = "Hello, FIFO";

    printf("Server =====\n");

    if(mkfifo("./HAN-FIFO", 0666) == -1){
        perror("mkfifo");
        exit(1);
    }

    if((pd = open("./HAN-FIFO", O_WRONLY)) == -1){
        perror("open");
        exit(1);
    }


    printf("To Client : %s\n", msg);

    n = write(pd, msg, strlen(msg)+1);
    if(n==-1){
        perror("write");
        exit(1);
    }
    close(pd);





    return 0;
}

2. client

#include <stdio.h>
#include <unistd.h>
#include <sys/times.h>
#include <limits.h>
#include <stdlib.h>
#include <time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <string.h>
#include <fcntl.h>

int main() {
    int pd, n;
    char inmsg[80];

    if((pd = open("./HAN-FIFO", O_RDONLY)) == -1){
        perror("open");
        exit(1);
    }

    printf("Client ====\n");
    write(1, "From Server :", 13);

    while((n=read(pd, inmsg, 80)) > 0)
        write(1, inmsg, n);

    if(n==-1){
        perror("read");
        exit(1);
    }

    write(1, "\n", 1);
    close(pd);

    return 0;
}