prepare for usleep

2 files changed, 12 insertions, 7 deletions

diff --git a/components/libc/compilers/armlibc/sys/types.h b/components/libc/compilers/armlibc/sys/types.h
index 2aad77c99d..78fee1bb99 100644
--- a/components/libc/compilers/armlibc/sys/types.h
+++ b/components/libc/compilers/armlibc/sys/types.h
@@ -5,20 +5,22 @@
  *
  * Change Logs:
  * Date           Author       Notes
- * 2020-09-05 Meco Man  fix bugs
+ * 2020-09-05     Meco Man     fix bugs
+ * 2020-12-16     Meco Man     add useconds_t
  */
 #ifndef __TYPES_H__
 #define __TYPES_H__
 
 #include <stdint.h>
 
-typedef int32_t clockid_t;
-typedef int32_t key_t;       /* Used for interprocess communication. */
-typedef int32_t pid_t;       /* Used for process IDs and process group IDs. */
+typedef int32_t          clockid_t;
+typedef int32_t          key_t;         /* Used for interprocess communication. */
+typedef int32_t          pid_t;         /* Used for process IDs and process group IDs. */
 #ifndef ARCH_CPU_64BIT
-typedef signed int   ssize_t;  /* Used for a count of bytes or an error indication. */
+typedef signed int       ssize_t;       /* Used for a count of bytes or an error indication. */
 #else
-typedef long signed int   ssize_t;  /* Used for a count of bytes or an error indication. */
+typedef long signed int  ssize_t;       /* Used for a count of bytes or an error indication. */
 #endif
+typedef unsigned long    useconds_t;    /* microseconds (unsigned) */
 
 #endif
diff --git a/components/libc/compilers/armlibc/sys/unistd.h b/components/libc/compilers/armlibc/sys/unistd.h
index 549771e8f4..73a73a267e 100644
--- a/components/libc/compilers/armlibc/sys/unistd.h
+++ b/components/libc/compilers/armlibc/sys/unistd.h
@@ -5,11 +5,13 @@
  *
  * Change Logs:
  * Date           Author       Notes
+ * 2020-12-16     Meco Man     add usleep
  */
 #ifndef _SYS_UNISTD_H
 #define _SYS_UNISTD_H
 
-#include <rtthread.h>
+#include <rtconfig.h>
+#include "types.h"
 
 #ifdef RT_USING_DFS
 
@@ -69,5 +71,6 @@ int     isatty      (int fd);
 char *  ttyname     (int desc);
 
 unsigned int sleep(unsigned int seconds);
+int usleep(useconds_t usec);
 
 #endif /* _SYS_UNISTD_H */