<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">What would happen if there were multiple active users at the same time (like with Screen Sharing, where the local GUI user and a remote user can both have active sessions)? Or with a local GUI user and another user SSH’d in?<div class=""><br class=""></div><div class="">-Greg</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Feb 25, 2016, at 5:43 AM, Ludovic Rousseau <<a href="mailto:ludovic.rousseau@gmail.com" class="">ludovic.rousseau@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class=""><div class=""><div class=""><div class=""><div class="">Hello,<br class=""><br class=""></div>I am using launchd to create a Unix domain socket /tmp/foobar.socket so that launchd starts my agent when someone connects to the sockets.<br class=""><br class=""></div>It works fine except when Fast User Switching is involved.<br class=""><br class=""><div class="">My problem is quite similar to the problem "Listening socket and
fast user switching" [1] discussed on this mailing list in 2008. The difference is that I am using a
UNIX domain socket and not a TCP socket.<br class=""></div><br class=""><br class=""></div>The problematic scenario is as follows:<br class=""></div>1. User A logs in<br class="">2. User A can connect to the socket<br class=""><br class="">3. User B logs in using the Fast User Switching<br class="">4. User B can connect to the socket<br class="">5. User B logs out<br class=""></div><br class=""><div class="">6. User A comes back and fast user switch to his session. Since user A<br class=""> does not _logs in_ again the socket is not changed/recreated and is still<br class=""> only usable by user B<br class=""><br class=""></div><div class="">At this step user A gets:<br class="">$ telnet /tmp/foobar.socket<br class="">Trying /tmp/foobar.socket...<br class="">/tmp/foobar.socket: Connection refused<br clear="all" class=""></div><div class=""><div class=""><div class=""><div class=""><div class=""><div class=""><br class=""></div><div class="">The socket is still present in /tmp/ but it belongs to user B and is no more usable but user A.<br class=""><br class=""></div><div class="">What I would like is the ability for launchd to (re)configure the Unix domain socket each time a user authenticates to the console, either the first time or using the fast user switching method.<br class=""><br class=""><br class=""></div><div class="">- I use a UNIX domain socket so that only local processes can talk to the socket and use my agent. I don't want to open my agent to other computer on the network.<br class=""></div><div class="">- I use launchd to start my agent on request only. That is a very nice feature. I can't detect the user switching since my agent code is, most of the time, not running.<br class=""></div><div class="">- I can't use a different socket name per user since the client of my agent does not know who is currently logged. My client application is talking to the socket configured for whoever is logged at that time.<br class=""></div><br class=""><br class=""><div class="">My /Library/LaunchAgents/com.foobar.plist file contains:<br class=""><br class=""><?xml version="1.0" encoding="UTF-8"?><br class=""><!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "<a href="http://www.apple.com/DTDs/PropertyList-1.0.dtd" class="">http://www.apple.com/DTDs/PropertyList-1.0.dtd</a>"><br class=""><plist version="1.0"><br class=""><dict><br class=""> <key>Label</key><br class=""> <string>com.foobar</string><br class=""> <key>ProgramArguments</key><br class=""> <array><br class=""> <string>/usr/local/lib/foobar_exe</string><br class=""> </array><br class=""> <key>Sockets</key><br class=""> <dict><br class=""> <key>Listeners</key><br class=""> <dict><br class=""> <key>SockPathName</key><br class=""> <string>/tmp/foobar.socket</string><br class=""> </dict><br class=""> </dict><br class=""> <key>ProcessType</key><br class=""> <string>Interactive</string><br class=""></dict><br class=""></plist><br class=""><br class=""><br class=""></div><div class="">Does launchd provides a solution to my problem?<br class=""></div><div class=""><br class="">Should I open a bug at Apple to ask for this new feature in launchd?<br class=""><br class=""></div><div class="">Thanks<br class=""></div><div class=""><br class=""></div>[1] <a href="https://lists.macosforge.org/pipermail/launchd-dev/2008-May/000298.html" target="_blank" class="">https://lists.macosforge.org/pipermail/launchd-dev/2008-May/000298.html</a><br class=""><div class=""><br class=""></div><div class="">-- <br class=""><div class=""> Dr. Ludovic Rousseau</div>
</div></div></div></div></div></div></div>
_______________________________________________<br class="">launchd-dev mailing list<br class=""><a href="mailto:launchd-dev@lists.macosforge.org" class="">launchd-dev@lists.macosforge.org</a><br class="">https://lists.macosforge.org/mailman/listinfo/launchd-dev<br class=""></div></blockquote></div><br class=""></div></body></html>