libc: Implement terminal api regardless of CONFIG_SERIAL_TERMIOS setting

since many functions aren't related to termios directly

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

include/cxx/cunistd

@@ -56,9 +56,7 @@ namespace std
 
   // Terminal I/O
 
-#ifdef CONFIG_SERIAL_TERMIOS
   using ::isatty;
-#endif
 
   // Memory management
 

include/nuttx/serial/serial.h

@@ -31,9 +31,7 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include <errno.h>
-#ifdef CONFIG_SERIAL_TERMIOS
-#  include <termios.h>
-#endif
+#include <termios.h>
 
 #include <nuttx/fs/fs.h>
 #include <nuttx/semaphore.h>

include/termios.h

@@ -29,8 +29,6 @@
 #include <sys/types.h>
 #include <stdint.h>
 
-#ifdef CONFIG_SERIAL_TERMIOS
-
 /****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/
@@ -319,5 +317,4 @@ int tcsetattr(int fd, int options, FAR const struct termios *termiosp);
 }
 #endif
 
-#endif /* CONFIG_SERIAL_TERMIOS */
 #endif /* __INCLUDE_TERMIOS_H */

include/unistd.h

@@ -327,14 +327,12 @@ ssize_t pwrite(int fd, FAR const void *buf, size_t nbytes, off_t offset);
 int     ftruncate(int fd, off_t length);
 int     fchown(int fd, uid_t owner, gid_t group);
 
-#ifdef CONFIG_SERIAL_TERMIOS
 /* Check if a file descriptor corresponds to a terminal I/O file */
 
 int     isatty(int fd);
 
 FAR char *ttyname(int fd);
 int       ttyname_r(int fd, FAR char *buf, size_t buflen);
-#endif
 
 /* Memory management */