This example starts a program called "CHKDSK.COM" with a C: parameter and waits until it finishes. The termination and return codes are displayed at the end.

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

 int main(VOID) {
 UCHAR       uchLoadError[CCHMAXPATH] = {0}; /* Error info from DosExecPgm */
 RESULTCODES ChildRC           = {0};       /* Results from child process  */
 PID         pidChild          = 0;         /* pid for child process       */
 APIRET      rc                = NO_ERROR;  /* Return code                 */
 UCHAR       uchEnvString[14]  = "ANYTHING=HERE\0";  /* Environment string */
 UCHAR       uchArgString[14]  = "CHKDSK\0 C: \0";   /* Argument string    */

       /* The argument string consists of the following:
             - the name of the program (followed by a NULL)
             - any parameters supplied to the program (followed by 2 NULLs)
          Only 1 NULL is explicitly specified at the end of this string.
          ASCIIZ strings end with a NULL already, giving us 2 NULLs.       */

   rc = DosExecPgm(uchLoadError,           /* Object name buffer           */
                   sizeof(uchLoadError),   /* Length of object name buffer */
                   EXEC_ASYNCRESULT,       /* Asynchronous/Trace flags     */
                   uchArgString,           /* Argument string              */
                   uchEnvString,           /* Environment string           */
                   &ChildRC,               /* Returns pid of process on an
                                              asynchronous request         */
                   "CHKDSK.COM");          /* Program file name            */

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

   rc = DosWaitChild(DCWA_PROCESS,    /* Look at only the process specified */
                     DCWW_WAIT,       /* Wait until a child terminates      */
                     &ChildRC,        /* Termination codes returned         */
                     &pidChild,       /* pid of terminating process         */
                     ChildRC.codeTerminate);   /* Process (pid) to look at  */

   if (rc != NO_ERROR) {
      printf("DosWaitChild error: return code = %u\n",rc);
      return 1;
   } else {
      printf("Child complete.  Termination Code: %u  Return Code: %u\n",
              ChildRC.codeTerminate, ChildRC.codeResult);
   }
   return NO_ERROR;
  }