SK/processes/fifo/c-cfifo.c

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h> /* Definition of AT_* constants */
#include <unistd.h>
#include <string.h>
#include <stdio.h>

static const char *kat = "/tmp/FIFO-TMP-SERWER";
static const char *kat_1 = "/tmp/FIFO-TMP-1-";
static const char *kat_2 = "/tmp/FIFO-TMP-2-";

int main()
{
    int f, f1, f2;
    pid_t pid = getpid();
    printf("pid: %d\n", pid);
    char kat_1_pid[100];
    char kat_2_pid[100];
    strcpy(kat_1_pid, kat_1);
    strcpy(kat_2_pid, kat_2);
    sprintf(kat_1_pid + strlen(kat_1), "%d", pid);
    sprintf(kat_2_pid + strlen(kat_2), "%d", pid);
    // printf(kat_1_pid);
    // printf(kat_2_pid);
    if ((f = open(kat, O_WRONLY)) == -1)
    {
        printf("kat open error\n");
        return;
    }
    if (mkfifo(kat_1_pid, 0600) == -1)
    {
        printf("mkfifo1 open error\n");
        return;
    }
    if (mkfifo(kat_2_pid, 0600) == -1)
    {
        printf("mkfifo2 open error\n");
        return;
    }
    write(f, &pid, sizeof(pid_t));
    if ((f2 = open(kat_2_pid, O_WRONLY)) == -1)
    {
        printf("kat2 open error\n");
        return;
    }
    printf("f2 open\n");
    if ((f1 = open(kat_1_pid, O_RDONLY)) == -1)
    {
        printf("kat1 open error\n");
        return;
    }
    printf("f1 open\n");
    double d2, d = 10.0;
    write(f2, &d, sizeof(double));
    read(f1, &d2, sizeof(double));
    printf("d1: %f d2: %f\n", d, d2);
    close(f1);
    close(f2);
    unlink(kat_1_pid);
    unlink(kat_2_pid);
    printf("%f\n", d2);
    close(f);
}