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man: clarify what TTYReset= and TTYVTDisallocate= do and do not do regarding screen clearing

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This commit is contained in:
Lennart Poettering
2024-07-19 11:44:04 +02:00
parent 56ea3c262c
commit c06b84d816
1 changed files with 9 additions and 6 deletions
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man/systemd.exec.xml
+9 -6
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@@ -3322,7 +3322,8 @@ StandardInputData=V2XigLJyZSBubyBzdHJhbmdlcnMgdG8gbG92ZQpZb3Uga25vdyB0aGUgcnVsZX
<term><varname>TTYReset=</varname></term>
<listitem><para>Reset the terminal device specified with <varname>TTYPath=</varname> before and after
execution. Defaults to <literal>no</literal>.</para></listitem>
execution. This does not erase the screen (see <varname>TTYVTDisallocate=</varname> below for
that). Defaults to <literal>no</literal>.</para></listitem>
</varlistentry>
<varlistentry>
@@ -3333,11 +3334,12 @@ StandardInputData=V2XigLJyZSBubyBzdHJhbmdlcnMgdG8gbG92ZQpZb3Uga25vdyB0aGUgcnVsZX
</varlistentry>
<varlistentry>
<term><varname>TTYRows=</varname></term>
<term><varname>TTYColumns=</varname></term>
<term><varname>TTYRows=</varname></term>
<listitem><para>Configure the size of the TTY specified with <varname>TTYPath=</varname>. If unset or
set to the empty string, the kernel default is used.</para>
set to the empty string, it is attempted to retrieve the dimensions of the terminal screen via ANSI
sequences, and if that fails the kernel defaults (typically 80x24) are used.</para>
<xi:include href="version-info.xml" xpointer="v250"/></listitem>
</varlistentry>
@@ -3345,9 +3347,10 @@ StandardInputData=V2XigLJyZSBubyBzdHJhbmdlcnMgdG8gbG92ZQpZb3Uga25vdyB0aGUgcnVsZX
<varlistentry>
<term><varname>TTYVTDisallocate=</varname></term>
<listitem><para>If the terminal device specified with <varname>TTYPath=</varname> is a virtual console
terminal, try to deallocate the TTY before and after execution. This ensures that the screen and scrollback
buffer is cleared. Defaults to <literal>no</literal>.</para></listitem>
<listitem><para>If the terminal device specified with <varname>TTYPath=</varname> is a virtual
console terminal, try to deallocate the TTY before and after execution. This ensures that the screen
and scrollback buffer is cleared. If the terminal device is of any other type of TTY an attempt is
made to clear the screen via ANSI sequences. Defaults to <literal>no</literal>.</para></listitem>
</varlistentry>
</variablelist>
</refsect1>