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

fusl/src/linux/epoll.c

+#include <sys/epoll.h>
+#include <signal.h>
+#include <errno.h>
+#include "syscall.h"
+
+int epoll_create(int size)
+{
+        return epoll_create1(0);
+}
+
+int epoll_create1(int flags)
+{
+        int r = __syscall(SYS_epoll_create1, flags);
+#ifdef SYS_epoll_create
+        if (r==-ENOSYS && !flags) r = __syscall(SYS_epoll_create, 1);
+#endif
+        return __syscall_ret(r);
+}
+
+int epoll_ctl(int fd, int op, int fd2, struct epoll_event *ev)
+{
+        return syscall(SYS_epoll_ctl, fd, op, fd2, ev);
+}
+
+int epoll_pwait(int fd, struct epoll_event *ev, int cnt, int to, const sigset_t *sigs)
+{
+        int r = __syscall(SYS_epoll_pwait, fd, ev, cnt, to, sigs, _NSIG/8);
+#ifdef SYS_epoll_wait
+        if (r==-ENOSYS && !sigs) r = __syscall(SYS_epoll_wait, fd, ev, cnt, to);
+#endif
+        return __syscall_ret(r);
+}
+
+int epoll_wait(int fd, struct epoll_event *ev, int cnt, int to)
+{
+        return epoll_pwait(fd, ev, cnt, to, 0);
+}