Thread: Problem with O_NONBLOCK Pipe

Hi,
I'm trying to send and receive using pipes:

send.cpp

Code:

struct
    {
            long a;
            long b;
    }T;
cout << "1" << endl;
if ( access ( FIFO_NAME, F_OK ) == -1 ) {
            res = mkfifo ( FIFO_NAME, 0755 );
            if ( res != 0 )
                    cout << " Can't make fifo" << endl;
}

cout << "2" << endl;
pipe_fd = open ( FIFO_NAME, O_WRONLY);
cout << "3: " << pipe_fd << endl;
a=b=1;
res = write ( pipe_fd, &T, sizeof ( T ) );
cout << "4" << endl;
close(pipe_fd);

recv.cpp

Code:

cout << "1" << endl;
pipe_fd = open(FIFO_NAME, O_RDONLY | O_NONBLOCK);
cout << "2" << endl;
res = read(pipe_fd, &T, sizeof(T));
cout << T.a << T.b << endl;
close(pipe_fd);

Code:

./send
./recv

open is correct, but when send.cpp executes "write" the program terminates and "4" is not displayed!!!! I recv side the T.a and T.b are not correct !

What's wrong with my programs?! (I have to say that programs are working correct when I remove O_NONBLOCK falg)

thanks