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man: extend sd-login(7) in regards to mixing D-Bus and synchronous library calls a bit

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Lennart Poettering 2011-12-19 17:40:31 +01:00
parent 595aae376f
commit 5079a105e7
1 changed files with 11 additions and 1 deletions
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12
man/sd-login.xml
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@ -77,13 +77,23 @@
you need to utilize the D-Bus API of
systemd-logind, instead.</para>
<para>These functions access data in
<para>These functions synchronously access data in
<filename>/proc</filename>,
<filename>/sys/fs/cgroup</filename> and
<filename>/run</filename>. All of these are virtual
file systems, hence the runtime cost of the accesses
is relatively cheap.</para>
<para>It is possible (and often a very good choice) to
mix calls to the synchronous interface of
<filename>sd-login.h</filename> with the asynchronous
D-Bus interface of systemd-logind. However, if this is
done you need to think a bit about possible races
since the stream of events from D-Bus and from
<filename>sd-login.h</filename> interfaces such as the
login monitor are asynchronous and not ordered against
each other.</para>
<para>If the functions return string arrays, these are
generally NULL terminated and need to be freed by the
caller with the libc