[libc] Add the first version for AIO.

Author: BernardXiong

components/libc/Kconfig

@@ -22,6 +22,10 @@ if RT_USING_LIBC && RT_USING_DFS
     config RT_USING_POSIX_TERMIOS
         bool "Enable termios feature"
         default n
+    
+    config RT_USING_POSIX_AIO
+        bool "Enable AIO"
+        default n
     endif
 endif
 

components/libc/aio/SConscript

@@ -0,0 +1,11 @@
+# RT-Thread building script for component
+
+from building import *
+
+cwd     = GetCurrentDir()
+src     = Glob('*.c') + Glob('*.cpp')
+CPPPATH = [cwd]
+
+group = DefineGroup('aio', src, depend = ['RT_USING_POSIX', 'RT_USING_POSIX_AIO'], CPPPATH = CPPPATH)
+
+Return('group')