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diff --git a/src/posix_spawn.h b/src/posix_spawn.h
new file mode 100644
index 0000000..ccfb0f0
--- /dev/null
+++ b/src/posix_spawn.h
@@ -0,0 +1,53 @@
+/*
+ * dhcpcd - DHCP client daemon
+ * Copyright (c) 2006-2012 Roy Marples <roy@marples.name>
+ * All rights reserved
+
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef POSIX_SPAWN_H
+#define POSIX_SPAWN_H
+
+#include <signal.h>
+
+typedef struct {
+ short posix_attr_flags;
+#define POSIX_SPAWN_SETSIGDEF 0x10
+#define POSIX_SPAWN_SETSIGMASK 0x20
+ sigset_t posix_attr_sigmask;
+ sigset_t posix_attr_sigdefault;
+} posix_spawnattr_t;
+
+typedef struct {
+// int unused;
+} posix_spawn_file_actions_t;
+
+int posix_spawn(pid_t *, const char *,
+ const posix_spawn_file_actions_t *, const posix_spawnattr_t *,
+ char *const [], char *const []);
+int posix_spawnattr_init(posix_spawnattr_t *);
+int posix_spawnattr_setflags(posix_spawnattr_t *, short);
+int posix_spawnattr_setsigmask(posix_spawnattr_t *, const sigset_t *);
+int posix_spawnattr_setsigdefault(posix_spawnattr_t *, const sigset_t *);
+
+#endif