Add a "fork" of musl as //fusl.

fusl/src/network/socket.c

Index: fusl/src/network/socket.c
diff --git a/fusl/src/network/socket.c b/fusl/src/network/socket.c
new file mode 100644
index 0000000000000000000000000000000000000000..a2e92d908265651a02e8e7bf544ea2dcd2e7ea82
--- /dev/null
+++ b/fusl/src/network/socket.c
@@ -0,0 +1,21 @@
+#include <sys/socket.h>
+#include <fcntl.h>
+#include <errno.h>
+#include "syscall.h"
+
+int socket(int domain, int type, int protocol)
+{
+	int s = socketcall(socket, domain, type, protocol, 0, 0, 0);
+	if (s<0 && (errno==EINVAL || errno==EPROTONOSUPPORT)
+	    && (type&(SOCK_CLOEXEC|SOCK_NONBLOCK))) {
+		s = socketcall(socket, domain,
+			type & ~(SOCK_CLOEXEC|SOCK_NONBLOCK),
+			protocol, 0, 0, 0);
+		if (s < 0) return s;
+		if (type & SOCK_CLOEXEC)
+			__syscall(SYS_fcntl, s, F_SETFD, FD_CLOEXEC);
+		if (type & SOCK_NONBLOCK)
+			__syscall(SYS_fcntl, s, F_SETFL, O_NONBLOCK);
+	}
+	return s;
+}