Workaround for hanging on exit: patch for review

[Andrey A. Chernov]

I often notice processes hanging forever on exit's ttywait when TCP
connection dropped. Here is a patch I plan to commit which restrict
waiting for output drain by 3 minutes. Any comments, improvements or
objections?

--- kern_exit.c.bak     Sun Apr 16 23:35:55 2000
+++ kern_exit.c Thu Apr 27 00:56:02 2000
@@ -230,6 +230,9 @@
                        if (sp->s_ttyp && (sp->s_ttyp->t_session == sp)) {
                                if (sp->s_ttyp->t_pgrp)
                                        pgsignal(sp->s_ttyp->t_pgrp, SIGHUP, 1);
+                               /* XXX don't hang forever */
+                               if (sp->s_ttyp->t_timeout == 0)
+                                       sp->s_ttyp->t_timeout = 180 * hz;
                                (void) ttywait(sp->s_ttyp);
                                /*
                                 * The tty could have been revoked

-- 
Andrey A. Chernov
<[EMAIL PROTECTED]>
http://nagual.pp.ru/~ache/


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