1 files changed, 101 insertions, 0 deletions
diff --git a/tests/testopen.c b/tests/testopen.c
new file mode 100644
index 0000000..c67a755
--- /dev/null
+++ b/tests/testopen.c
@@ -0,0 +1,101 @@
+/*
+    Copyright (C) 2012 Andreas Baumann <abaumann@yahoo.com>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+
+int main( void )
+{
+	char buf[4096];
+	int fd;
+	int res;
+	ssize_t wres;
+	struct stat s;
+
+	/* Make sure no file is around from last invocation */
+	(void)unlink( "./mnt/testopen" );
+	
+	/* This should succeed */
+	fd = open( "./mnt/testopen", O_CREAT | O_EXCL | O_WRONLY, S_IRUSR | S_IWUSR );
+	if( fd < 0 ) {
+		perror( "Unable to create testopen" );
+		return 1;
+	}
+
+	/* write some data into it so we know if truncate really works */
+	memset( buf, 0, 4096 );
+
+	wres = write( fd, buf, 4096 );
+	if( wres != 4096 ) {
+		perror( "Error writing" );
+		(void)close( fd );
+		return 1;
+	}
+	
+	(void)close( fd );
+
+	/* check if the file has size 4096 */
+	res = stat( "./mnt/testopen", &s );
+	if( res < 0 ) {
+		perror( "Error stating testopen" );
+		return 1;
+	}
+	if( s.st_size == 4096 ) {
+		// OK
+	} else {
+		fprintf( stderr, "Size of file should be 4096, but is %jd\n", s.st_size );
+		return 1;
+	}
+	
+	/* Second one should fail with EEXIST */
+	fd = open( "./mnt/testopen", O_CREAT | O_EXCL | O_WRONLY, S_IRUSR | S_IWUSR );
+	if( fd < 0 && errno == EEXIST ) {
+		// OK
+	} else {
+		fprintf( stderr, "Second create succedded and should not" );
+		return 1;
+	}
+	
+	/* Third one should success and truncate the file */
+	fd = open( "./mnt/testopen", O_CREAT | O_WRONLY | O_TRUNC, S_IRUSR | S_IWUSR );
+	(void)close( fd );	
+	
+	/* check if the file has size zero */
+	res = stat( "./mnt/testopen", &s );
+	if( res < 0 ) {
+		perror( "Error stating testopen" );
+		return 1;
+	}
+	if( s.st_size == 0 ) {
+		// OK
+	} else {
+		fprintf( stderr, "Size of file should be 0, but is %jd\n", s.st_size );
+		return 1;
+	}
+	
+	res = unlink( "./mnt/testopen" );
+	if( res < 0 ) {
+		perror( "Error removing testopen" );
+		return 1;
+	}
+	
+	return 0;
+}