1 files changed, 56 insertions, 0 deletions
diff --git a/lib/clplumbing/mkstemp_mode.c b/lib/clplumbing/mkstemp_mode.c
new file mode 100644
index 0000000..69c080b
--- /dev/null
+++ b/lib/clplumbing/mkstemp_mode.c
@@ -0,0 +1,56 @@
+/*
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <lha_internal.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <clplumbing/mkstemp_mode.h>
+
+
+/*
+ * A slightly safer version of mkstemp(3)
+ *
+ * In this version, the file is initially created mode 0, and then chmod-ed
+ * to the requested permissions.  This guarantees that the file is never
+ * open to others beyond the specified permissions at any time.
+ */
+int
+mkstemp_mode(char* template, mode_t filemode)
+{
+
+	mode_t	maskval;
+	int	fd;
+
+	maskval = umask(0777);
+
+	/* created file should now be mode 0000 */
+	fd = mkstemp(template);
+
+	umask(maskval);	/* cannot fail :-) */
+
+	if (fd >= 0) {
+		if (chmod(template, filemode) < 0) {
+			int	save = errno;
+			close(fd);
+			errno = save;
+			fd = -1;
+		}
+	}
+	return fd;
+}