tweak mdb_copy, trap signals

libraries/liblmdb/mdb_copy.1

@@ -18,11 +18,6 @@ is specified it must be the path of an empty directory
 for storing the backup. Otherwise, the backup will be
 written to stdout.
 
-Note: currently, if the copy is interrupted a stale lock
-will be left in the LMDB environment. This may be fixed
-in a future release, but until then you must not
-interrupt the copy process.
-
 .SH DIAGNOSTICS
 Exit status is zero if no errors occur.
 Errors result in a non-zero exit status and

libraries/liblmdb/mdb_copy.c

@@ -11,10 +11,22 @@
  * top-level directory of the distribution or, alternatively, at
  * <http://www.OpenLDAP.org/license.html>.
  */
+#ifdef _WIN32
+#include <windows.h>
+#define	MDB_STDOUT	GetStdHandle(STD_OUTPUT_HANDLE)
+#else
+#define	MDB_STDOUT	1
+#endif
 #include <stdio.h>
 #include <stdlib.h>
+#include <signal.h>
 #include "lmdb.h"
 
+static void
+sighandle(int sig)
+{
+}
+
 int main(int argc,char * argv[])
 {
 	int rc;
@@ -26,6 +38,15 @@ int main(int argc,char * argv[])
 		exit(EXIT_FAILURE);
 	}
 
+#ifdef SIGPIPE
+	signal(SIGPIPE, sighandle);
+#endif
+#ifdef SIGHUP
+	signal(SIGHUP, sighandle);
+#endif
+	signal(SIGINT, sighandle);
+	signal(SIGTERM, sighandle);
+
 	rc = mdb_env_create(&env);
 
 	rc = mdb_env_open(env, envname, MDB_RDONLY, 0);
@@ -33,7 +54,7 @@ int main(int argc,char * argv[])
 		printf("mdb_env_open failed, error %d %s\n", rc, mdb_strerror(rc));
 	} else {
 		if (argc == 2)
-			rc = mdb_env_copyfd(env, 1);
+			rc = mdb_env_copyfd(env, MDB_STDOUT);
 		else
 			rc = mdb_env_copy(env, argv[2]);
 		if (rc)