close.c

嵌入式实验uC-OS-II相关程序用例与参考资料

/* $id:dmClose.c  V1.0 2001/09/5 */

/******************************************************************************
 *  This source code has been made available to you by CORETEK  on
 *  AS-IS.Anyone receiving this source is licensed under
 *  CORETEK copyrights to use it in any way he or she deems fit,including
 *  copying it,modifying it,compiling it,and redistributing it either with
 *  or without modifictions.
 *
 *
 *  Any person who transfers this source code or any derivative work must
 *  include the CORETEK copyright notice, this paragraph,and the preceding
 *  two paragraphs in the transferred software.
 *
 *
 *       COPYRIGHT CORETEK CORPORATION 2001
 *     LICENSED MATERIAL - PROGRAM PROPERTY OF CORETEK
 *****************************************************************************/

/******************************************************************************
 *
 *  FILE: Close.c
 *
 *  MODULE: RLT
 *
 *  PURPOSE: close() - POSIX 1003.1b 6.3.1 - Close a File
 *
 *  AUTHOR(S):Zhang Yumin
 *
 *  GROUP:TOOL_GROUP
 *
 *  DATE CREATED:2001/09/05
 *
 *  REFERENCE DOCUMENT ID:
 *
 *  MODIFICATIONS:
 *  Date          user Name       Description
 *  2001/09/05    Zhang Yumin    Create this file
 *
 *********************************************************************************/

#include <sys/reent.h>

int sys_close(int fd)
{
	
}


/********************************************************************
 *  FUNCTION: close
 *
 *  PURPOSE:  Close a device or a file and free a fd.
 *  PARAMETERS:
 *
 *    Input:  fd  -file descriptor of target file.
 *    Output: None
 *    InOut:  None
 *
 *  Return value: Upon successful completion, a value of 0 is returned.
 *				  Otherwise, a value of -1 is returned and the global
 *		          integer variable errno is set to indicate the error.
 *  Reentrant: Yes
 ********************************************************************/
int _close_r(struct _reent *ptr, int fd)
{
	int rc = sys_close(fd);
	if(rc < 0)
	{
		ptr->_errno = -rc;
		return -1;
	}
	return rc;
}


#ifndef _REENT_ONLY

int close(int fd)
{
  	return _close_r(_REENT,fd);
}

#endif