linux - c program hangs/loops when "sudo -s" command is executed -


I am currently writing a program that will run multiple command (in one line) in CLI with C.

The first order I need to run is sudo -s . So I go out to test this command alone if the program is running, but the program is hanging while running this command. I wanted to know whether the problem is program or order, so I ls Run This program works perfectly when I run the ls command, I think that there is something wrong with the sudo -s command, There is a need to do something with which This is the job that runs in CLI 

  int executeCommand (char * command, char * result) {/ * This function runs the command . / / / / * Return value is the command * / int nSuccess = -1; FILE * fp = NULL; Four buffer [1035]; If (command == NULL) render ("command is empty"); If present (result == faucet) ("the result is zero"); If (command! = Null & amp; result! = Null) {fp = popen (command, "r"); If (fp! = NULL) {strcpy (result, "\ 0"); While (FATS (buffer, size (buffer-1, FP)! = Null) {Rebel (result, buffer); } pclose (fp); } nSuccess = 0; } Return nSuccess; }   
 BTW, I am doing a web app, the user will write down the command that he wants to execute. Through input  AJAX  will be sent to the server using a  POST  request. And the server runs on Linux.   
 
 
  sudo -s   
 requires password , So that the command running the command can wait for the password to enter the program

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