gcc 编译报错

报错信息

error: ‘S_IRWXU’ undeclared (first use in this function)
error: ‘S_IXGRP’ undeclared (first use in this function); did you mean ‘S_IRGRP’?
error: ‘S_IXOTH’ undeclared (first use in this function); did you mean ‘S_IROTH’?
error: ‘S_IROTH’ undeclared (first use in this function); did you mean ‘S_IRGRP’?
error: ‘S_IFSOCK’ undeclared (first use in this function); did you mean ‘S_IFDIR’?
error: ‘S_IFIFO’ undeclared (first use in this function); did you mean ‘S_IFMT’?
error: ‘S_IFMT’ undeclared (first use in this function); did you mean ‘__PMT’?

解决办法

头文件加上 

#include <sys/stat.h>