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

fusl/src/select/pselect.c

Index: fusl/src/select/pselect.c
diff --git a/fusl/src/select/pselect.c b/fusl/src/select/pselect.c
new file mode 100644
index 0000000000000000000000000000000000000000..4e2d7b073dbad9eee66d09cdab1af9922ce6bc8b
--- /dev/null
+++ b/fusl/src/select/pselect.c
@@ -0,0 +1,13 @@
+#include <sys/select.h>
+#include <signal.h>
+#include <stdint.h>
+#include "syscall.h"
+#include "libc.h"
+
+int pselect(int n, fd_set *restrict rfds, fd_set *restrict wfds, fd_set *restrict efds, const struct timespec *restrict ts, const sigset_t *restrict mask)
+{
+	syscall_arg_t data[2] = { (uintptr_t)mask, _NSIG/8 };
+	struct timespec ts_tmp;
+	if (ts) ts_tmp = *ts;
+	return syscall_cp(SYS_pselect6, n, rfds, wfds, efds, ts ? &ts_tmp : 0, data);
+}