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Diffstat (limited to 'doc/s6-linux-init-shutdown.html')
| -rw-r--r-- | doc/s6-linux-init-shutdown.html | 49 |
1 files changed, 43 insertions, 6 deletions
diff --git a/doc/s6-linux-init-shutdown.html b/doc/s6-linux-init-shutdown.html index b48ea61..519d1e3 100644 --- a/doc/s6-linux-init-shutdown.html +++ b/doc/s6-linux-init-shutdown.html @@ -32,8 +32,10 @@ It is normally invoked as <tt>/sbin/shutdown</tt>. <ul> <li> If the <tt>-c</tt> option is present, a pending shutdown is cancelled. </li> - <li> Else, it triggers the shutdown procedure. </li> - <li> It exits 0. The shutdown procedure happens asynchronously. </li> + <li> Else, it plans the shutdown procedure at time <em>time</em>. </li> + <li> If a <em>message</em> argument has been given, <em>message</em> is +broadcast to all logged in users (as tracked by utmp). </li> + <li> <tt>shutdown</tt> exits 0. The shutdown procedure happens asynchronously. </li> </ul> <p> @@ -42,12 +44,42 @@ It is normally invoked as <tt>/sbin/shutdown</tt>. interface. </p> -<h2> Exit codes </h2> +<p> + <em>time</em> must follow the following format: +<tt>[ now | [+]<em>mins</em> | <em>hh</em>:<em>mm</em> ] +</p> + +<ul> + <li> <tt>now</tt> means: trigger the shutdown sequence immediately. </li> + <li> <em>hh</em>:<em>mm</em> means: absolute time. Trigger the shutdown sequence when the time +<em>hh</em>:<em>mm</em> occurs. If that time has passed for the day, it will wait for the +next day. <em>hh</em> must have 1 or 2 digits; <em>mm</em> must have 2 digits. </li> + <li> <em>mins</em> or <tt>+</tt><em>mins</em> means: relative time. Trigger the shutdown +sequence after <em>mins</em> minutes. </li> +</ul> + +<h2> Options </h2> <ul> - <li> 0: shutdown procedure triggered. </li> - <li> 100: wrong usage, or user does not have root privileges. </li> - <li> 111: system call failed. </li> + <li> <tt>-a</tt> : access control. The shutdown sequence will only be +launched if one of the users listed in <tt>/etc/shutdown.allow</tt> +is currently logged in (as tracked by utmp). <tt>/etc/shutdown.allow</tt> +is a text file, one user per line, lines starting with <tt>#</tt> are comments. </li> + <li> <tt>-t</tt> <em>sec</em> : at the end of the shutdown sequence, +when it's time to kill all processes, have a "grace time" period +of <em>sec</em> seconds between the SIGTERM and the SIGKILL (to allow processes +receiving SIGTERM to exit cleanly). Default is 3 seconds. </li> + <li> <tt>-k</tt> : warning only. <em>message</em> will be sent to all +logged in users, but the shutdown sequence will not be triggered. </li> + <li> <tt>-h</tt> : at the end of the shutdown sequence, halt the system. </li> + <li> <tt>-p</tt> : at the end of the shutdown sequence, power off the system. +(This option is provided as an extension, it is not required by the LSB interface.) </li> + <li> <tt>-r</tt> : at the end of the shutdown sequence, reboot the system. </li> + <li> <tt>-f</tt> : ignored. </li> + <li> <tt>-F</tt> : ignored. </li> + <li> <tt>-c</tt> l: cancel a planned shutdown (i.e. cancel the effect of a +previous call to <tt>shutdown</tt> with a <em>time</em> argument that was not <tt>now</tt>). +This cannot be used to interrupt a shutdown sequence that has already started. </li> </ul> <h2> Notes </h2> @@ -60,6 +92,11 @@ the <tt>bin/</tt> subdirectory of the target will contain a <tt>shutdown</tt> symlink to <tt>s6-linux-init-shutdown</tt>. The <tt>bin/</tt> subdirectory should be copied by the administrator into <tt>/sbin</tt> for full interface compatibility with sysvinit. </li> + <li> The <tt>-f</tt> and <tt>-F</tt> options are only accepted for compatibility. +LSB says they are used to advise the system to skip or enforce a <tt>fsck</tt> +after rebooting. But they are only advisory, and for decades now systems have used +other methods of evaluating whether they should perform filesystem checks, so these +options are largely obsolete nowadays. </li> </ul> </body> |