rotate-on-sighup-v2.patch

diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 5d5f2d2..b49711f 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -4912,6 +4912,23 @@ local0.*    /var/log/postgresql
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-log-rotate-on-sighup" xreflabel="log_rotate_on_sighup">
+      <term><varname>log_rotate_on_sighup</varname> (<type>boolean</type>)
+      <indexterm>
+       <primary><varname>log_rotate_on_sighup</> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        When <varname>logging_collector</varname> is enabled,
+        this parameter will cause the log file to be rotated when the <command>
+        postgres</> server receives SIGHUP.
+        This parameter can only be set in the <filename>postgresql.conf</>
+        file or on the server command line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-log-truncate-on-rotation" xreflabel="log_truncate_on_rotation">
       <term><varname>log_truncate_on_rotation</varname> (<type>boolean</type>)
       <indexterm>
diff --git a/src/backend/postmaster/syslogger.c b/src/backend/postmaster/syslogger.c
index 58b759f..70091cd 100644
--- a/src/backend/postmaster/syslogger.c
+++ b/src/backend/postmaster/syslogger.c
@@ -64,6 +64,7 @@
 bool		Logging_collector = false;
 int			Log_RotationAge = HOURS_PER_DAY * MINS_PER_HOUR;
 int			Log_RotationSize = 10 * 1024;
+bool		Log_rotate_on_sighup;
 char	   *Log_directory = NULL;
 char	   *Log_filename = NULL;
 bool		Log_truncate_on_rotation = false;
@@ -353,6 +354,12 @@ SysLoggerMain(int argc, char *argv[])
 			}
 
 			/*
+			 * Force rotation on SIGHUP if configured to do so.
+			 */
+			if (Log_rotate_on_sighup)
+				rotation_requested = true;
+
+			/*
 			 * Force rewriting last log filename when reloading configuration.
 			 * Even if rotation_requested is false, log_destination may have
 			 * been changed and we don't want to wait the next file rotation.
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index fa92ce2..924dc0b 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1494,6 +1494,15 @@ static struct config_bool ConfigureNamesBool[] =
 		NULL, NULL, NULL
 	},
 	{
+		{"log_rotate_on_sighup", PGC_SIGHUP, LOGGING_WHERE,
+			gettext_noop("Automatic log file rotation will occur on SIGHUP."),
+			NULL
+		},
+		&Log_rotate_on_sighup,
+		false,
+		NULL, NULL, NULL
+	},
+	{
 		{"log_truncate_on_rotation", PGC_SIGHUP, LOGGING_WHERE,
 			gettext_noop("Truncate existing log files of same name during log rotation."),
 			NULL
diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample
index 66d0938..0a8b88c 100644
--- a/src/backend/utils/misc/postgresql.conf.sample
+++ b/src/backend/utils/misc/postgresql.conf.sample
@@ -389,6 +389,8 @@
 #log_rotation_size = 10MB		# Automatic rotation of logfiles will
 					# happen after that much log output.
 					# 0 disables.
+#log_rotate_on_sighup = off		# If on, automatic rotation of logfiles
+					# will happen on SIGHUP.
 
 # These are relevant when logging to syslog:
 #syslog_facility = 'LOCAL0'
diff --git a/src/include/postmaster/syslogger.h b/src/include/postmaster/syslogger.h
index b35fadc..3b45dd5 100644
--- a/src/include/postmaster/syslogger.h
+++ b/src/include/postmaster/syslogger.h
@@ -65,6 +65,7 @@ typedef union
 extern bool Logging_collector;
 extern int	Log_RotationAge;
 extern int	Log_RotationSize;
+extern bool Log_rotate_on_sighup;
 extern PGDLLIMPORT char *Log_directory;
 extern PGDLLIMPORT char *Log_filename;
 extern bool Log_truncate_on_rotation;