Header File 

stdlib.h 

Category 

Process Control Routines 

Prototype 

void _exit(int status); 

Description 

Terminates program. 

_exit terminates execution without closing any files, flushing any output, or calling any exit functions. 

The calling process uses status as the exit status of the process. Typically a value of 0 is used to indicate a normal exit, and a nonzero value indicates some error. 

Return Value 

None. 

Example  

#include   <stdlib.h>
#include   <stdio.h>
void done(void);
int main(void)
{
   atexit(done);
   _exit(0);
   return 0;
}
void done()
{
   printf("hello\n");
}

Portability