linux下怎么判断标准输出是不是被重定向到了文件？

[happynxy]

Linux下面，我想判断标准输出/出错是不是被重定向到了文件，换句话说，我想看标准输出/出错是不是定向到了用户的终端上，这个用什么办法呢？

谢谢！！

[ganjianh8]

你用标准输出都是用std::cout吧
建议你看看msdn对ostream的说明
以及ostream_withassign::ostream_withassign会对你有用

[luciferisnotsatan]

int fstat(int fildes, struct stat *buf)
看看0，1，2三个文件文件描述符的状态

[happynxy]

[Quote=引用 2 楼 luciferisnotsatan 的回复:]

int fstat(int fildes, struct stat *buf)
看看0，1，2三个文件文件描述符的状态
[/Quote]请问看哪个状态可以看出来呢？谢谢~~

[赵4老师]

st_mode

Bit mask for file-mode information. The _S_IFCHR bit is set if handle refers to a device. The _S_IFREG bit is set if handle refers to an ordinary file. The read/write bits are set according to the file’s permission mode. _S_IFCHR and other constants are defined in SYS\STAT.H.

[happynxy]

[Quote=引用 4 楼 zhao4zhong1 的回复:]

st_mode

Bit mask for file-mode information. The _S_IFCHR bit is set if handle refers to a device. The _S_IFREG bit is set if handle refers to an ordinary file. The read/write bits are set accordin……
[/Quote]谢谢！