This example adds an exit routine named "ExitRtn1" to the exit-list sequence. Routines in this sequence must use DosExitList instead of DosExit to end.

 #define INCL_DOSPROCESS              /* Process and thread values */
 #define INCL_DOSERRORS               /* DOS error values          */
 #include <os2.h>
 #include <stdio.h>

 VOID APIENTRY ExitRtn1(VOID);        /* Our exit routine */

 int main(VOID) {

    APIRET rc = NO_ERROR;

    rc = DosExitList(EXLST_ADD             /* Add to exit-list sequence     */
                     | 0x00002A00,         /* Invocation order is 42 (0x2A) */
                     (PFNEXITLIST) ExitRtn1); /* Specify added exit routine */

    if (rc != NO_ERROR) {
      printf("DosExitList error: return code = %u\n", rc);
      return 1;
    }

    printf("Routine main ends...\n");

    return NO_ERROR;
   }

      /* All exit list routines must be declared as VOID APIENTRY.
         This ensures the integrity of the stack.                  */

 VOID APIENTRY ExitRtn1(VOID)
    {
    APIRET  erc = NO_ERROR;                     /* Return code */

    printf("... but ExitRtn1 runs last.\n");

           /* Might want to save data or close files here */

    erc = DosExitList(EXLST_EXIT,               /* Exit         */
                      (PFNEXITLIST) NULL);

    if (erc != NO_ERROR) {
      printf("DosExitList error: return code = %u\n", erc);
    }

    return;
    }