When the program below (run as parent.exe 0) is run, it eventually allocates all the dos memory and quits. Similar program compiled with Borland C 3.1 works correctly. I suspect that the problem is probably with the transfer buffer, which is not freed after exec. The problem occured, when I tried to upgrade the program version from within the program itself.

#include "stdio.h"
#include "stdlib.h"
#include "conio.h"
#include "process.h"
#include "malloc.h"
#include "string.h"
#include <go32.h>

main(int argc, char *argv[])

{
   char tbuf[256],a;
   int i=0;
   unsigned long mlen;

   i=atoi(argv[1]);

   printf("Call %d, PSP: %lx\n",i,_go32_info_block.linear_address_of_original_psp);
   sprintf(tbuf,"%d",i+1);
   a=getch();
   if(a=='q')
      return 1;
   execlp("parent.exe","parent.exe",tbuf,NULL);
   printf("after exec\n");
}

This is not a bug: execXX are simply spawnXX in disguise.

In other words, the parent program isn't terminated when the child
is invoked.  Therefore, the parent's memory (not just DOS memory, ALL
memory) cannot be freed until the child exits.

I'm closing this bug report.