[cs631apue] starting functions in GNU Linux mian()

Jin Sun jsun6 at stevens.edu
Wed Sep 17 01:35:32 EDT 2014


This article, which is written by Jim Meyering,  teaches us how to write a
robust "Hello World!” program. In this article I find out the reason why
every linux command have this line of code "atexit (close_stdout);”. Let’s
look at the beginning of main() function:

  (void)setlocale(LC_ALL, "”);      //Set current locale

  initialize_main (&argc, &argv);      //Something about VMS, fill * with
real arguments
  set_program_name (argv[0]);
  setlocale (LC_ALL, "");
  bindtextdomain (PACKAGE, LOCALEDIR);  //Set directory containing message
  textdomain (PACKAGE);
  atexit (close_stdout);        //Handle stdout error.

The “close_stdout" function will catch stdout error for example:

ls > /dev/full
ls: write error: No space left on device

On Tue, Sep 16, 2014 at 10:15 PM, xxu15 at stevens.edu <xxu15 at stevens.edu>

>  Hi,
> I found that in many GNU Linux c files, at the begining of the main()
> function, there are such functions being invoked as below:
> initialize_main (&argc, &argv);
> set_program_name (argv[0]);
> setlocale (LC_ALL, "");
>  bindtextdomain (PACKAGE, LOCALEDIR);
> textdomain (PACKAGE);
> Has any body figured out what they are used for ?
> ------------------------------
>    Sincerely,
> Xiang Xu (徐祥)
> Student ID: 10388813
> tel: +1 (201) 918-0570
>       +86 13851478402
> qq: 185904095
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