Thread: pipe question

On page 502 in the book "Advanced Programming in the Unix Environment" by Stevens and Rago,
they have a the following function to help sychronize the parent and
child.

Code:

static int pfd1[2] , pfd2[2];

void
TELL_PARENT(pid_t pid)
{
    if (write(pfd2[1],  "c", 1) != 1)
        err_sys("write error");

}

What's the point of using pid if the function TELL_PARENT() doesn't
actually use it?

I think it's an attempt by the authors to confuse their readers.....or just an omission.

Check the errata for other "oops": http://www.apuebook.com/index.html

gg

There's nothing about it in the errata.