_DLL_InitTerm Function
#include <windows.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define CCHMAXPATH 255
/* _CRT_init is the C run-time environment initialization function. */
/* It will return 0 to indicate success and -1 to indicate failure. */
int _CRT_init(void);
#ifdef STATIC_LINK
/* _CRT_term is the C run-time environment termination function. */
/* It only needs to be called when the C run-time functions are statically */
/* linked. */
void _CRT_term(void);
#else
static void cleanup(void);
#endif
size_t nSize;
int *pArray;
/* _DLL_InitTerm is the function that gets called by the operating system */
/* loader when it loads and frees this DLL for each process that accesses */
/* this DLL. However, it only gets called the first time the DLL is loaded */
/* and the last time it is freed for a particular process. The system */
/* linkage convention MUST be used because the operating system loader is */
/* calling this function. */
unsigned long _System _DLL_InitTerm(unsigned long hModule, unsigned long
ulFlag, long * dummy)
{
size_t i;
int rc;
char namebuf[CCHMAXPATH];
/* If ulFlag is one then the DLL is being loaded so initialization should*/
/* be performed. If ulFlag is zero then the DLL is being freed so */
/* termination should be performed. */
switch (ulFlag) {
case 1 :
/*******************************************************************/
/* The C run-time environment initialization function must be */
/* called before any calls to C run-time functions that are not */
/* inlined. */
/*******************************************************************/
if (_CRT_init() == -1)
return 0UL;
#ifndef STATIC_LINK
/*******************************************************************/
/* Cleanup routine is registered by atexit function to clean up */
/* if the runtime is dynamically linked. */
/*******************************************************************/
if (atexit(cleanup))
printf("atexit for cleanup failed\n");
#endif
if ((rc = GetModuleFileName((void *)hModule, namebuf, CCHMAXPATH)) == 0)
printf("GetModuleFileName returned %lu\n", GetLastError());
else
printf("The name of this DLL is %s\n", namebuf);
srand(17);
nSize = (rand()%128)+32;
printf("The array size for this process is %u\n", nSize);
if ((pArray = malloc(nSize *sizeof(int))) == NULL) {
printf("Could not allocate space for unsorted array.\n");
return 0UL;
}
for (i = 0; i < nSize; ++i)
pArray[i] = rand();
break;
case 0 :
#ifdef STATIC_LINK
printf("The array will now be freed.\n");
free(pArray);
_CRT_term();
#endif
break;
default :
printf("ulFlag = %lu\n", ulFlag);
return 0UL;
}
/* A non-zero value must be returned to indicate success. */
return 1UL;
}
#ifndef STATIC_LINK
static void cleanup(void)
{
printf("The array will now be freed.\n");
free(pArray);
return ;
}
#endif
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Initializing and Terminating the
DLL Environment