mailing list of musl libc

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 #include <unistd.h>
#include <errno.h>
#include "syscall.h"

int dup2(int old, int new)
{
	int r;
#ifdef SYS_dup2
	while ((r=__syscall(SYS_dup2, old, new))==-EBUSY);
#else
	if (old==new) {
		if (__syscall(SYS_fcntl, old, F_GETFD) < 0)
			return __syscall_ret(-EBADF);
		return 0;
	}
	while ((r=__syscall(SYS_dup3, old, new, 0))==-EBUSY);
#endif
	return __syscall_ret(r);
}