1 files changed, 74 insertions, 0 deletions
diff --git a/lib/util/dup3.c b/lib/util/dup3.c
new file mode 100644
index 0000000..68d6ebf
--- /dev/null
+++ b/lib/util/dup3.c
@@ -0,0 +1,74 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2013 Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#ifndef HAVE_DUP3
+
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "sudo_compat.h"
+
+int
+sudo_dup3(int oldd, int newd, int flags)
+{
+    int oflags;
+
+    if (oldd == newd) {
+	errno = EINVAL;
+	return -1;
+    }
+
+    if (dup2(oldd, newd) == -1)
+	return -1;
+
+    oflags = fcntl(newd, F_GETFL, 0);
+    if (oflags == -1)
+	goto bad;
+
+    if (ISSET(flags, O_NONBLOCK)) {
+	if (!ISSET(oflags, O_NONBLOCK)) {
+	    SET(oflags, O_NONBLOCK);
+	    if (fcntl(newd, F_SETFL, oflags) == -1)
+		goto bad;
+	}
+    } else {
+	if (ISSET(oflags, O_NONBLOCK)) {
+	    CLR(oflags, O_NONBLOCK);
+	    if (fcntl(newd, F_SETFL, oflags) == -1)
+		goto bad;
+	}
+    }
+    if (ISSET(flags, O_CLOEXEC)) {
+	if (fcntl(newd, F_SETFD, FD_CLOEXEC) == -1)
+	    goto bad;
+    }
+    return 0;
+bad:
+    close(newd);
+    return -1;
+}
+
+#endif /* HAVE_DUP3 */