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• Start service with start-stop-daemon on Ubuntu 16.04 with timeout

  26 février 2018, par Topper

  I have /etc/init.d/stream proces with start/stop/restart options.
  It’s run ffmpeg with daemon options taken from /etc/default/stream DAEMON_OPTIONS.
  Start at background (-b) crate pid (/var/run/stream/stream.pid) etc.

  How could I add timeout 60 seconds to be sure that stream will be forcebly stopped if exceed 60 sek. timeout ?

  Can’t run "—exec timeout 60 ffmpeg" because service runs only timeout command.

  I’m I missing something or try to use wrong command ?

• tcp : set socket buffer sizes before listen/connect/accept

  9 janvier 2017, par Joel Cunningham

  tcp : set socket buffer sizes before listen/connect/accept
  From e24d95c0e06a878d401ee34fd6742fcaddeeb95f Mon Sep 17 00:00:00 2001
  
  From : Joel Cunningham <joel.cunningham@me.com>
  
  Date : Mon, 9 Jan 2017 13:37:51 -0600
  
  Subject : [PATCH] tcp : set socket buffer sizes before listen/connect/accept
  Attempting to set SO_RCVBUF and SO_SNDBUF on TCP sockets after connection
  
  establishment is incorrect and some stacks ignore the set call on the socket at
  
  this point.  This has been observed on MacOS/iOS.  Windows 7 has some peculiar
  
  behavior where setting SO_RCVBUF after applies only if the buffer is increasing
  
  from the default while decreases are ignored.  This is possibly how the incorrect
  
  usage has gone unnoticed
  Unix Network Programming Vol. 1 : The Sockets Networking API (3rd edition, seciton 7.5) :
  "When setting the size of the TCP socket receive buffer, the ordering of the
  
  function calls is important.  This is because of TCP’s window scale option,
  
  which is exchanged with the peer on SYN segments when the connection is
  
  established. For a client, this means the SO_RCVBUF socket option must be
  
  set before calling connect.  For a server, this means the socket option must
  
  be set for the listening socket before calling listen.  Setting this option
  
  for the connected socket will have no effect whatsoever on the possible window
  
  scale option because accept does not return with the connected socket until
  
  TCP’s three-way handshake is complete.  This is why the option must be set on
  
  the listening socket. (The sizes of the socket buffers are always inherited from
  
  the listening socket by the newly created connected socket)"
  Signed-off-by : Joel Cunningham <joel.cunningham@me.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/tcp.c

• 3 hidden Piwik features you likely don’t know, that will make you more productive

  17 janvier 2017, par InnoCraft — Community

  At Piwik and at InnoCraft, we always aim to make features as intuitive as possible. Having thousands of features in Piwik and having to find a balance between beginners and advanced users can sometimes be a challenge. Sometimes this even leads to building hidden features that are mainly targeted for power users. The list below shows three of them, did you know any of them yet ?

  BTW : If you don’t have Piwik yet, you can try them on our Piwik Demo.

  1. Search

  When you press the letter “f”, it will activate the search bar in the top left. Once you start typing something, it will show matching reports. Say you want to view reports about “devices” but don’t remember exactly which category it is in, simply start typing “devices” and the matching entry will show up without even having to move the mouse.

  The search bar also searches for matching websites and segments. Use the arrow up and down keys to select the entry you want and press enter to confirm the selection.

  Say you don’t remember the name of a report but you know it is listed under the category “Visitor”, then start typing the name of the category and it will show all related reports.

  2. Zen Mode

  When you press the letter “z”, it will activate the Zen Mode which lets you focus on the reports and content by removing the header and left menu. To disable the Zen Mode, simply press “z” again.

  This is especially useful in combination with the search bar mentioned above, as it enables you to quickly switch between reports, websites and segments even while menu and header are hidden.

  3. Faster period change

  Changing the displayed period is a task you likely perform quite often when analyzing reports. Usually, you would first select the period and then press the button “Apply” in the date selector. Instead, you can simply double click the name of the period and it will immediately load the selected period without having to click on the “Apply” button.

  What are your hidden features in Piwik ?

  Let us know by getting in touch with us or share it with us on Facebook or Twitter.