🆕 clock()函数

user/apps/shell/cmd.c

@@ -432,7 +432,7 @@ int shell_cmd_exec(int argc, char **argv)
         // printf("parent process wait for pid:[ %d ]\n", pid);
 
         waitpid(pid, &retval, 0);
-        printf("parent process wait pid [ %d ], exit code=%d\n", pid, retval);
+        // printf("parent process wait pid [ %d ], exit code=%d\n", pid, retval);
         free(argv);
     }
 }

user/libs/libc/time.c

@@ -27,6 +27,16 @@ int usleep(useconds_t usec)
         tv_sec : (long int)(usec / 1000000),
         tv_nsec : (long int)(usec % 1000000) * 1000UL
     };
-    
+
     return nanosleep(&ts, NULL);
+}
+
+/**
+ * @brief 获取系统当前cpu时间
+ * 
+ * @return clock_t 
+ */
+clock_t clock()
+{
+    return (clock_t)syscall_invoke(SYS_CLOCK, 0,0,0,0,0,0,0,0);
 }

user/libs/libc/time.h

@@ -35,4 +35,11 @@ struct timespec
  * @param rmtp 返回的剩余休眠时间
  * @return int 
  */
-int nanosleep(const struct timespec *rqtp, struct timespec *rmtp);
+int nanosleep(const struct timespec *rqtp, struct timespec *rmtp);
+
+/**
+ * @brief 获取系统当前cpu时间
+ * 
+ * @return clock_t 
+ */
+clock_t clock();

user/libs/libsystem/syscall.h

@@ -23,6 +23,7 @@
 #define SYS_EXIT 16 // 进程退出
 #define SYS_MKDIR 17 // 创建文件夹
 #define SYS_NANOSLEEP 18 // 纳秒级休眠
+#define SYS_CLOCK 19 // 获取当前cpu时间
 
 /**
  * @brief 用户态系统调用函数