@node exit, process
@subheading Syntax

@example
#include <stdlib.h>

void exit(int exit_code);
@end example

@subheading Description

This function exits the program, returning @var{exit_code} to the
calling process.  Before exiting, all open files are closed and all
@code{atexit} and @code{on_exit} requests are processed. 

@subheading Return Value

This function does not return.

@subheading Portability

@portability ansi, posix

@subheading Example

@example
if (argc < 4)
@{
  print_usage();
  exit(1);
@}
@end example