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man: mention that sd_id128_get_boot() and friend may return -ENOSYS

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And drop to mention sd_id128_get_boot_app_specific() may return -ENOENT
or -ENOMEDIUM. The function does not read /etc/machine-id. But reads a
file in the procfs, which is a kind of the kernel API. Hence the
failures are caused only when the system has wrong setup.
This commit is contained in:
Yu Watanabe 2022-12-08 15:49:02 +09:00
parent e2720340e9
commit c576920e67
1 changed files with 14 additions and 8 deletions
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22
man/sd_id128_get_machine.xml
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@ -129,19 +129,17 @@
<varlistentry>
<term><constant>-ENOENT</constant></term>
<listitem><para>Returned by <function>sd_id128_get_machine()</function>,
<function>sd_id128_get_machine_app_specific()</function>, and
<function>sd_id128_get_boot_app_specific()</function> when <filename>/etc/machine-id</filename> is
missing.</para></listitem>
<listitem><para>Returned by <function>sd_id128_get_machine()</function> and
<function>sd_id128_get_machine_app_specific()</function> when <filename>/etc/machine-id</filename>
is missing.</para></listitem>
</varlistentry>
<varlistentry>
<term><constant>-ENOMEDIUM</constant></term>
<listitem><para>Returned by <function>sd_id128_get_machine()</function>,
<function>sd_id128_get_machine_app_specific()</function>, and
<function>sd_id128_get_boot_app_specific()</function> when <filename>/etc/machine-id</filename> is
empty or all zeros.</para></listitem>
<listitem><para>Returned by <function>sd_id128_get_machine()</function> and
<function>sd_id128_get_machine_app_specific()</function> when <filename>/etc/machine-id</filename>
is empty or all zeros.</para></listitem>
</varlistentry>
<varlistentry>
@ -152,6 +150,14 @@
<filename>/etc/machine-id</filename> is <literal>uninitialized</literal>.</para></listitem>
</varlistentry>
<varlistentry>
<term><constant>-ENOSYS</constant></term>
<listitem><para>Returned by <function>sd_id128_get_boot()</function> and
<function>sd_id128_get_boot_app_specific()</function> when <filename>/proc/</filename> is not
mounted.</para></listitem>
</varlistentry>
<varlistentry>
<term><constant>-ENXIO</constant></term>