c - Why is PWD empty and how to fix it? -

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I am using lighttpd and have written the following CGI script: 

  main } {Printf ("Content-Type: Text / HTML \ n \ n"); Four * pwd = ""; PWD = getenv ("PWD"); Printf ("Current Path:% s", PWD); }   
 Result  
  The current path is: (null)   
 Well, why do not I get it and I Do not know how to execute the path of the script. I am searching for [0] Razis with a path, and used PWD for it but maybe I should do something different.  
  UPDATE   
 is not working well  
  four CWD [_PC_PATH_MAX + 1]; Getcwd (cwd, _PC_PATH_MAX + 1);   
 is cwd "". It may be that my script knew that if I used to stop the 1408 room as my datacenter, then where was it. : P   
 
 
 Instead of using  getcwd () . No need to set  PWD .  
  #include & lt; Unistd.h & gt; Char * getcwd (four * buf, size_t size);

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