nx_pipe.nx

nx_pipe.nx -- pipe(2) + pipe2(2) wrappers. Pipes are how forked processes communicate: parent fork()s, child write to pipe[1], parent reads from pipe[0]. The build tool pattern is: pipe(fds) # fds[0]=read end, fds[1]=write end pid = fork() if pid == 0: # child close(fds[0]) dup3(fds[1], 1, 0) # redirect stdout execve(...) else: # parent close(fds[1]) n = read(fds[0], buf, ...) Linux RV64 has no sys_pipe -- we use sys_pipe2 (number 59) with flags=0. Optionally O_CLOEXEC to avoid leaking ends across exec. Pairs with nx_fcntl + nx_proc.