用于嵌入式Linux系统的标准C的库函数

				#include 				#include 				#include 								char *				getwd (char *buf)				{				  char tmp[MAXPATHLEN];								  if (buf == NULL)				    {				      errno = EINVAL;				      return NULL;				    }								  if (getcwd (tmp, MAXPATHLEN) == NULL)				    return NULL;								  return strncpy (buf, tmp, MAXPATHLEN);				}