检测用C，如果输出到终端 [英] Detect in C if outputting to a terminal

问题描述

我写了OS X和Linux C程序，我要调整基于其是否是怎么回事到终端的输出。我知道，我们已经介绍了如何做到这一点在shell脚本，例如这里：

I'm writing a C program for OS X and Linux, and I want to tweak the output based on whether or not it's going to a terminal. I know we've covered how to do this in a shell script, e.g. here:

<一个href=\"http://stackoverflow.com/questions/911816/detecting-the-output-stream-type-of-a-shell-script\">http://stackoverflow.com/questions/911816/detecting-the-output-stream-type-of-a-shell-script

但我怎么做它在C程序？

But how do I do it in a C program?

推荐答案

使用 isatty（）为其：

$ man isatty
ISATTY(3)                  Linux Programmer's Manual                 ISATTY(3)

NAME
       isatty - does this descriptor refer to a terminal

SYNOPSIS
       #include <unistd.h>

       int isatty(int desc);

DESCRIPTION
       returns  1  if  desc is an open file descriptor connected to a terminal
       and 0 otherwise.

由于标准输出总是文件描述符1，你可以这样做：

Since stdout is always file descriptor 1, you can do:

if(isatty(1))
    // stdout is a terminal

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