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<title>s6: the s6-setsid program</title>
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<h1> The s6-setsid program </h1>
<p>
s6-setsid runs a program as a new session leader, or in a new
foreground or background process group.
</p>
<h2> Interface </h2>
<pre>
s6-setsid [ -s | -b | -f | -g ] [ -i | -I | -q ] [ -d ctty ] <em>prog...</em>
</pre>
<ul>
<li> s6-setsid creates a new session, or a new process group,
and may make that process group the foreground process group,
depending on the options it is run with. </li>
<li> As session leader or process group leader, s6-setsid then
executes into <em>prog...</em>. </li>
</ul>
<h2> Options </h2>
<ul>
<li> <tt>-s</tt> : session. s6-setsid will try and execute
<em>prog</em> as a session leader. This is the default. </li>
<li> <tt>-b</tt> : background process group. s6-setsid will
not create a new session, but will create a new process group, and
try and execute <em>prog</em> as the new process group leader. </li>
<li> <tt>-f</tt> : foreground process group. s6-setsid will
not create a new session, but will create a new process group and
attach its session's controlling terminal to the new process group
before executing <em>prog</em>. However, the new process group
will likely be stopped, waiting for the former foreground process
group to relinquish the controlling terminal, and will need to be
sent a SIGCONT to resume. To avoid that, use the next option. </li>
<li> <tt>-g</tt> : grab terminal. s6-setsid will
not create a new session, but will create a new process group and
attach its session's controlling terminal to the new process group
before executing <em>prog</em>. It will forcefully grab the controlling
terminal from the former foreground process group: a process
belonging to that former foreground process group will be stopped if
it attempts to read from or write to that terminal. </li>
<li> <tt>-i</tt> : strict. If s6-setsid cannot perform the
operations it needs, it will exit 111 with an error message. </li>
<li> <tt>-I</tt> : loose. If s6-setsid cannot perform the operations,
it will print a warning message, but exec into <em>prog</em> nonetheless.
This is the default. </li>
<li> <tt>-q</tt> : silent. s6-setsid will not print any warning
message; it will exec into <em>prog</em> even if it cannot perform the
operations. </li>
<li> <tt>-d <em>ctty</em></tt> : assume file descriptor
number <em>ctty</em> is
the controlling terminal for the current session. Default is 0.
This is only useful when used with the <tt>-f</tt> or
<tt>-g</tt> options. </li>
</ul>
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