This example queries and displays the maximum length for a path name and the total amount of physical memory in bytes.

#define INCL_DOSMISC       /* DOS Miscellaneous values */
#define INCL_DOSERRORS     /* DOS Error values         */
#include <os2.h>
#include <stdio.h>

int main(VOID)  {

  ULONG   aulSysInfo[QSV_MAX] = {0};       /* System Information Data Buffer */
  APIRET  rc                  = NO_ERROR;  /* Return code                    */

  rc = DosQuerySysInfo(1L,                 /* Request all available system   */
                       QSV_MAX,            /* information                    */
                       (PVOID)aulSysInfo,
                       sizeof(ULONG)*QSV_MAX);

  if (rc != NO_ERROR) {
     printf("DosQuerySysInfo error: return code = %u\n", rc);
     return 1;
  } else {
     printf("Maximum length for a path name is %u characters.\n",
             aulSysInfo[QSV_MAX_PATH_LENGTH-1]);  /* Max length of path name */

     printf("Total physical memory is %u bytes.\n",
             aulSysInfo[QSV_TOTPHYSMEM-1]);       /* Total physical memory   */
  } /* endif */

   return NO_ERROR;
}