diff --git a/src/posix_spawn.c b/src/posix_spawn.c
new file mode 100644
index 0000000..18ceb06
--- /dev/null
+++ b/src/posix_spawn.c
@@ -0,0 +1,156 @@
+/*
+ * 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.
+ */
+
+/* This implementation of posix_spawn is only suitable for the needs of dhcpcd
+ * but it could easily be extended to other applications. */
+
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include <errno.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "posix_spawn.h"
+
+#ifndef _NSIG
+#ifdef _SIG_MAXSIG
+#define _NSIG _SIG_MAXSIG + 1
+#else
+/* Guess */
+#define _NSIG SIGPWR + 1
+#endif
+#endif
+
+extern char **environ;
+
+static int
+posix_spawnattr_handle(const posix_spawnattr_t *attrp)
+{
+	struct sigaction sa;
+	int i;
+
+	if (attrp->posix_attr_flags & POSIX_SPAWN_SETSIGMASK)
+		sigprocmask(SIG_SETMASK, &attrp->posix_attr_sigmask, NULL);
+
+	if (attrp->posix_attr_flags & POSIX_SPAWN_SETSIGDEF) {
+		memset(&sa, 0, sizeof(sa));
+		sa.sa_handler = SIG_DFL;
+		for (i = 1; i < _NSIG; i++) {
+			if (sigismember(&attrp->posix_attr_sigdefault, i)) {
+				if (sigaction(i, &sa, NULL) == -1)
+					return -1;
+			}
+		}
+	}
+
+	return 0;
+}
+
+inline static int
+is_vfork_safe(short int flags)
+{
+	return !(flags & (POSIX_SPAWN_SETSIGDEF | POSIX_SPAWN_SETSIGMASK));
+}
+
+int
+posix_spawn(pid_t *pid, const char *path,
+	const posix_spawn_file_actions_t *file_actions,
+	const posix_spawnattr_t *attrp,
+	char *const argv[], char *const envp[])
+{
+	short int flags;
+	pid_t p;
+	volatile int error;
+
+	error = 0;
+	flags = attrp ? attrp->posix_attr_flags : 0;
+	if (file_actions == NULL && is_vfork_safe(flags))
+		p = vfork();
+	else
+#ifdef THERE_IS_NO_FORK
+		return ENOSYS;
+#else
+		p = fork();
+#endif
+	switch (p) {
+	case -1:
+		return errno;
+	case 0:
+		if (attrp) {
+			error = posix_spawnattr_handle(attrp);
+			if (error)
+				_exit(127);
+		}
+		execve(path, argv, envp);
+		error = errno;
+		_exit(127);
+	default:
+		if (error != 0)
+			waitpid(p, NULL, WNOHANG);
+		else if (pid != NULL)
+			*pid = p;
+		return error;
+	}
+}
+
+int
+posix_spawnattr_init(posix_spawnattr_t *attr)
+{
+
+	memset(attr, 0, sizeof(*attr));
+	attr->posix_attr_flags = 0;
+	sigprocmask(0, NULL, &attr->posix_attr_sigmask);
+	sigemptyset(&attr->posix_attr_sigdefault);
+	return 0;
+}
+
+int
+posix_spawnattr_setflags(posix_spawnattr_t *attr, short flags)
+{
+
+	attr->posix_attr_flags = flags;
+	return 0;
+}
+
+int
+posix_spawnattr_setsigmask(posix_spawnattr_t *attr, const sigset_t *sigmask)
+{
+
+	attr->posix_attr_sigmask = *sigmask;
+	return 0;
+}
+
+int
+posix_spawnattr_setsigdefault(posix_spawnattr_t *attr, const sigset_t *sigmask)
+{
+
+	attr->posix_attr_sigdefault = *sigmask;
+	return 0;
+}