document siginfo and add it to macros.h

Signed-off-by: Mattias Andrée <maandree@operamail.com>

3 files changed, 22 insertions, 2 deletions

diff --git a/TODO b/TODO
index c2c1b44..55d3848 100644
--- a/TODO
+++ b/TODO
@@ -69,3 +69,5 @@ to autorelease.
 
 IPA keyboard layout
 
+Add support for SIGINFO
+
diff --git a/doc/info/mds.texinfo b/doc/info/mds.texinfo
index 665ee0d..a051a6c 100644
--- a/doc/info/mds.texinfo
+++ b/doc/info/mds.texinfo
@@ -432,6 +432,15 @@ unavailable when running under @command{valgrind}}.
 Unimportant servers may choose to die on
 @command{SIGDANGER}.
 
+Server may also choose to support the signal
+@command{SIGINFO}, or if not defined
+@command{SIGRTMIN + 2}. It is not expected
+that server do support this signal, but
+thay must not die when received. @command{SIGINFO}
+is send by a user to the server, if she wants
+the server to dump information about the
+server's state or statistics to the TTY.
+
 
 
 @node Filesystem
@@ -4056,8 +4065,8 @@ If @code{condition} is satisfied,
 @end table
 
 Additionally, @file{<libmdsserver/macros.h>}
-defines any missing signal name:
-currently @code{SIGDANGER} and
+defines any missing signal name: currently
+@code{SIGDANGER}, @code{SIGINFO} and
 @code{SIGUPDATE}, and by inclusion of
 @file{<libmdsserver/macro-bits.h>}, variants
 of @code{atoi} for portability and
diff --git a/src/libmdsserver/macros.h b/src/libmdsserver/macros.h
index 2e1013d..7ab5f04 100644
--- a/src/libmdsserver/macros.h
+++ b/src/libmdsserver/macros.h
@@ -610,6 +610,15 @@
 
 
 /**
+ * The user want the server to dump information
+ * about the server's state or statistics
+ */
+#ifndef SIGINFO
+# define SIGINFO  (SIGRTMIN + 2)
+#endif
+
+
+/**
  * The user wants the program to re-exec.
  * into an updated binary
  */