/* pipeout.c */
#include <stdio.h>

int main(int argc,char *argv[])
{
    FILE *pd;
    char instring[100];

    if((pd = popen("cat\n","w")) == NULL) {
        perror("Cannot open pipe");
        exit(1);
    }
    fputs("The first string to cat\n",pd);
    fflush(pd);
    sleep(5);
    fputs("The second string to cat\n",pd);
    fflush(pd);
    pclose(pd);
    exit(0);
}