[systemd-devel] [PATCH] man: add instruction on clearing file descriptors

[Petar Kapriš]

In the daemon.7 manpage, I added an instruction on closing open file
descriptors, an important step in daemon startup, showing an option to
close them using the files in /dev/fd (a more portable alternative
across systems to using /proc/self/fd)
---
 man/daemon.xml | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/man/daemon.xml b/man/daemon.xml
index db95d2f75b..4bae6ebb82 100644
--- a/man/daemon.xml
+++ b/man/daemon.xml
@@ -47,12 +47,13 @@
         <listitem><para>Close all open file descriptors except
         standard input, output, and error (i.e. the first three file
         descriptors 0, 1, 2). This ensures that no accidentally passed
-        file descriptor stays around in the daemon process. On Linux,
-        this is best implemented by iterating through
-        <filename>/proc/self/fd</filename>, with a fallback of
-        iterating from file descriptor 3 to the value returned by
+        file descriptor stays around in the daemon process.  On most
+        modern systems, this is best implemented by iterating through
+        <filename>/dev/fd</filename>, or
+        <filename>/proc/self/fd</filename> on Linux, with a fallback
+        of iterating from file descriptor 3 to the value returned by
         <function>getrlimit()</function> for
-        <constant>RLIMIT_NOFILE</constant>. </para></listitem>
+        <constant>RLIMIT_NOFILE</constant>.  </para></listitem>
 
         <listitem><para>Reset all signal handlers to their default.
         This is best done by iterating through the available signals
-- 
2.29.2