9fans - fans of the OS Plan 9 from Bell Labs
 help / color / mirror / Atom feed
From: Joel “chesky” Salomon <JoelCSalomon@Gmail.com>
To: 9fans@cse.psu.edu
Subject: [9fans] handling notes
Date: Tue, 10 Oct 2006 23:30:56 -0400	[thread overview]
Message-ID: <cacac24c6a8c9a92718f9fee727bf88d@plan9.jp> (raw)

I'm doing an exercise for my Operating Systems class here at Cooper, and I'm supposed to be catching signals.  The professor was nice enough to let me catch notes on Plan 9 if I could make that work.

The code is at <http://www.tip9ug/who/chesky/src/katp.c> and <http://www.tip9ug/who/chesky/src/wdp.c>.  Basically, katp installs a note handler with atnotify then spawns a pager to catenate its command-line aguments to.  Wdp, the World’s Dumbest Pager, reads a single ½KB chunk from stdin then closes it and exits.

Eventually, katp is supposed to recognize that the pipe is closed and respawn wdp; I’m not there yet.  Right now, I can’t get the note handler to print anything on pipe close.  If I add a sleep(long time) somewhere and interrupt it, the handler reports it; just not for the closed pipe.

What am I missing or doing wrong?

Thanks,
--Joel



             reply	other threads:[~2006-10-11  3:30 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-10-11  3:30 Joel “chesky” Salomon [this message]
2006-10-11  4:35 ` Russ Cox
2006-10-11  7:52   ` Joel “chesky” Salomon

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=cacac24c6a8c9a92718f9fee727bf88d@plan9.jp \
    --to=joelcsalomon@gmail.com \
    --cc=9fans@cse.psu.edu \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).