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如何安全使用新的 Linux 函数?
原标题:How to safely use new Linux functions?
  • 时间:2012-05-23 21:38:02
  •  标签:
  • c
  • linux

我写了使用sched_setalgindity的代码, 需要2.5.8内或以后。 我一直在尝试弄清楚这些事情是否可行:

  1. Systems with older kernels to compile this gracefully, perhaps just ignoring that code segment entirely.
  2. If I send someone with an older kernel a compiled binary, it will step over this function or simply print a warning.

我猜我的问题是,你如何安全地使用新的内核函数,而不在使用旧系统时中断整个应用程序?

最佳回答

您试图将您的程序连接或运行吗? 您可以直接通过 glibc syscall () 函数拨打系统, 而不需要最近的 C 库 。 显然, 它会在没有支持的情况下在先前的系统上失败( 快速测试显示内核返回 - 1 = ENOSYS = ENOSYSYS), 因此您需要为此测试 。

问题回答

使用 dlopen () , 以 NULLL 表示文件名, 并使用 dlsym () 表示您想要使用的函数。 如果 dlsym () 表示成功, 请通过返回的函数指针调用该函数 。





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