#include<stdio.h>
#include<stdlib.h>
#include<errno.h>
#include<unistd.h>
int main()
{
int pfds[2];
char buf[30];
if(pipe(pfds)==-1)
{
perror("pipe");
exit(1);
}
printf("writing to file descriptor #%d\n", pfds[1]);
write(pfds[1],"test",5);
printf("reading from file descriptor #%d\n ", pfds[0]);
read(pfds[0],buf,5);
printf("read\"%s\"\n" ,buf);
}