[posix] 将posix单独划分为一个Kconfig目录

components/libc/posix/Kconfig

@@ -0,0 +1,58 @@
+menu "POSIX (Portable Operating System Interface) layer"
+
+config RT_USING_POSIX_FS
+    bool "Enable POSIX file system, open()/read()/write()/close() etc"
+    select RT_USING_DFS
+    select DFS_USING_POSIX
+    default n
+
+if RT_USING_POSIX_FS
+    config RT_USING_POSIX_DEVIO
+        bool "Enable devices as file descriptors"
+        select RT_USING_DFS_DEVFS
+        default n
+
+    config RT_USING_POSIX_POLL
+        bool "Enable poll()"
+        default n
+
+    config RT_USING_POSIX_SELECT
+        bool "Enable select()"
+        select RT_USING_POSIX_POLL
+        default n
+endif
+
+config RT_USING_POSIX_DELAY
+    bool "Enable delay APIs, sleep()/usleep()/msleep() etc"
+    default n
+
+config RT_USING_POSIX_GETLINE
+    bool "Enable getline()/getdelim()"
+    select RT_USING_LIBC
+    select RT_LIBC_USING_FILEIO
+    default n
+
+config RT_USING_POSIX_MMAP
+    bool "Enable mmap()"
+    select RT_USING_POSIX_FS
+    default n
+
+config RT_USING_POSIX_TERMIOS
+    bool "Enable termios APIs"
+    default n
+
+config RT_USING_POSIX_AIO
+    bool "Enable AIO APIs"
+    default n
+
+config RT_USING_PTHREADS
+    bool "Enable pthreads APIs"
+    default n
+
+if RT_USING_PTHREADS
+    config PTHREAD_NUM_MAX
+        int "Maximum number of pthreads"
+        default 8
+endif
+
+endmenu