Header File 

io.h  

Category 

Input/output Routines 

Prototype 

int _rtl_close(int handle); 

Description 

Closes a file.

It does not write a Ctrl-Z character at the end of the file. If you want to terminate the file with a Ctrl-Z, you must explicitly output one. 

Return Value 

On success, _rtl_close returns 0.  

On error (if it fails because handle is not the handle of a valid, open file), _rtl_close returns a value of -1 and the global variable errno is set to

Example

#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <io.h>
int main(void)
{
   int handle;
   char msg[] = "Hello world";
   if ((handle = _rtl_open("TEST.$$$", O_RDWR)) == -1)
   {
      perror("Error:");
      return 1;
   }
   _rtl_write(handle, msg, strlen(msg));
   _rtl_close(handle);
   return 0;
}

Portability