rename和renameat
#include <stdio.h>
int rename(const char *oldname,const char*newname);
int renameat(int oldfd,const char *oldname,int newfd, const char *newname);
成功返回0;失败返回-1#include <stdio.h>
int rename#include <stdio.h>
int rename(const char *oldname,const char*newname);
int renameat(int oldfd,const char *oldname,int newfd, const char *newname);
成功返回0;失败返回-1#include <stdio.h>
int rename