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ComputingCStdlib.h

exit

Perform normal program termination

Interface

#include <stdlib.h>
void exit (int status)
void _Exit (int status)

Description

The exit and _Exit functions terminate a process.

Before termination, exit performs the following functions in the order listed:
  • Call the functions registered with the reference:atexit function, in the reverse order of their registration.
  • Flush all open output streams.
  • Close all open streams.
  • Unlink all files created with the reference:tmpfile function.

The _Exit function terminates without calling the functions registered with the reference:atexit function, and may or may not perform the other actions listed. Both functions make the low-order eight bits of the status argument available to a parent process which has called a wait-family function.

The C Standard defines the values 0, EXIT_SUCCESS, and EXIT_FAILURE as possible values of status. Cooperating processes may use other values; in a program which might be called by a mail transfer agent, the values described in sysexits may be used to provide more information to the parent process.

Note that exit does nothing to prevent bottomless recursion should a function registered using reference:atexit itself call exit . Such functions must call _Exit instead (although this has other effects as well which may not be desired).

The code below should always exit with error code 0.

Example 1

#include <stdio.h>
#include <stdlib.h>
 
void main()
{
  int a = 0;
 
  if (a == 1) 
    exit(1);
  else 
    exit(0);
 
  // this never gets to execute
  a = 1;
}

Return Values

The exit and _Exit functions never return.

Last Modified: 18 Dec 11 @ 14:37     Page Rendered: 2022-03-14 15:49:01