Bug in TC2-d2 killpg()

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        Bug report from : Michael Kerrisk , self

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@ page 1 line 22253 section killpg() comment {example for killpg()}

Problem:

This is an EXAMPLE for the killpg() man page.  Line number 
references are to TC1.  


Action:

Change

"None"

to the following:

[Summary] Sending a signal to all other members of a process group

The following example shows how the calling process could send a 
signal to all other members of its process group.  To prevent 
itself from receiving the signal it first makes itself immune to
the signal by ignoring it.

#include <signal.h>
#include <unistd.h>
...
    if (signal(SIGUSR1, SIG_IGN) == SIG_ERR)
        /* Handle error */;

    if (killpg(getpgrp(), SIGUSR1) == -1)
        /* Handle error */;