增加GNU Octave中的popen2缓冲区大小

Question

是否可以在Octave和子进程之间增加popen2中使用的缓冲区？看起来缓冲区限制在大约66560字节。此代码段显示了问题：

## This works with s = 65
## but not with s = 66
s = 66;
[in, out, pid] = popen2 ("dd", {"if=/dev/urandom",
                                "bs=1K",
                                sprintf("count=%i", s)});
pause (1);
[vt, cnt] = fread(out);
assert (cnt, s * 1024);
waitpid (pid);
fclose (in);
fclose (out);

返回：

66+0 Datensätze ein
66+0 Datensätze aus
67584 Bytes (68 kB) kopiert, 0.999523 s, 67.6 kB/s
error: ASSERT errors for:  assert (cnt,s * 1024)

  Location  |  Observed  |  Expected  |  Reason
     ()         66560        67584       Abs err 1024 exceeds tol 0