[libc] implement extension standard C functions (#6044)

* implement extension standard C functions

1 files changed, 0 insertions, 60 deletions

diff --git a/components/libc/compilers/common/sys/select.h b/components/libc/compilers/common/sys/select.h
deleted file mode 100644
index 1232edd6e8..0000000000
--- a/components/libc/compilers/common/sys/select.h
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
- * Copyright (c) 2006-2021, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2021-07-21     Meco Man     The first version
- * 2021-12-25     Meco Man     Handle newlib 2.2.0 or lower version
- */
-
-#ifndef __SYS_SELECT_H__
-#define __SYS_SELECT_H__
-
-#include <rtthread.h>
-#include <sys/types.h>
-#include <sys/time.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#ifndef  FD_SETSIZE
-#define  FD_SETSIZE  32
-#endif
-
-#ifdef SAL_USING_POSIX
-#ifdef FD_SETSIZE
-#undef FD_SETSIZE
-#endif
-#define FD_SETSIZE      DFS_FD_MAX
-#endif /* SAL_USING_POSIX */
-
-typedef long    fd_mask;
-
-#ifndef _SYS_TYPES_FD_SET /* Newlib 2.2.0 or lower version */
-#define   NBBY    8       /* number of bits in a byte */
-#define   NFDBITS (sizeof (fd_mask) * NBBY)   /* bits per mask */
-#ifndef   howmany
-#define   howmany(x,y)    (((x)+((y)-1))/(y))
-#endif /* howmany */
-
-typedef struct _types_fd_set {
-    fd_mask fds_bits[howmany(FD_SETSIZE, NFDBITS)];
-} _types_fd_set;
-#define fd_set _types_fd_set
-
-#define FD_SET(n, p)    ((p)->fds_bits[(n)/NFDBITS] |= (1L << ((n) % NFDBITS)))
-#define FD_CLR(n, p)    ((p)->fds_bits[(n)/NFDBITS] &= ~(1L << ((n) % NFDBITS)))
-#define FD_ISSET(n, p)  ((p)->fds_bits[(n)/NFDBITS] & (1L << ((n) % NFDBITS)))
-#define FD_ZERO(p)      rt_memset((void*)(p), 0, sizeof(*(p)))
-#endif /* _SYS_TYPES_FD_SET */
-
-int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* __SYS_SELECT_H__ */