apilinux功能

linux api提供了在操作系统上操作的所有功能吗？

1、听说QT库只是用来做界面的，而我是想走底层开发，那么我不需要界面的话，可不可以只学linux操作系统提供的API，不学QT库呢？2、windows操作系统上任何库都是对底层api的封装，也就是说直接调用api才能达到最灵活的效果，那么linux自带的api也是这样？QT库是不是底层也是调用的操作系统的API，在linux环境下？也就是说我直接学API，不用学QT库也行吧？

为什么linux下的API功能那么少？

我看到linux只有进程，文件，内存方面的API？windows api还有网络，GUI，图形,硬件方面的API？linux下有也有这方面的API吗？在哪里学，我不喜欢QT那种半跨平台，想学原生程序。

linux下有和windows下的WaitForMultObjects同样功能的API吗？（除了select，poll之类的）

windows的同步对象都是用句柄来表示，所以，WaitForMultObjects可以等待多个句柄signal，并且最多的功能是等待N个句柄里的某一个，并且进行对应的处理。linux下有select，poll之类的来进行对多个socket或者文件进行监听，但是不能等待多个mutex，而条件变量和mutex的组合的模式又不一样。简单的问题就是，linux多个线程，每个线程可以同时等待多个对象，并...

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