diff options
Diffstat (limited to 'winsup/mingw/dllcrt1.c')
| -rw-r--r-- | winsup/mingw/dllcrt1.c | 141 |
1 files changed, 124 insertions, 17 deletions
diff --git a/winsup/mingw/dllcrt1.c b/winsup/mingw/dllcrt1.c index a0055d8b0..fe351eb10 100644 --- a/winsup/mingw/dllcrt1.c +++ b/winsup/mingw/dllcrt1.c @@ -25,10 +25,11 @@ * $Date$ * */ - +#include <stdlib.h> #include <stdio.h> #include <io.h> #include <process.h> +#include <errno.h> #include <windows.h> /* Unlike normal crt1, I don't initialize the FPU, because the process @@ -40,8 +41,20 @@ extern void __main (); extern void __do_global_dtors (); #endif +typedef void (* p_atexit_fn )(void); +static p_atexit_fn* first_atexit; +static p_atexit_fn* next_atexit; + +static void +__dll_exit (void); + +/* This is based on the function in the Wine project's exit.c */ +p_atexit_fn __dllonexit (p_atexit_fn, p_atexit_fn**, p_atexit_fn**); + + extern BOOL WINAPI DllMain (HANDLE, DWORD, LPVOID); + BOOL WINAPI DllMainCRTStartup (HANDLE hDll, DWORD dwReason, LPVOID lpReserved) { @@ -49,41 +62,135 @@ DllMainCRTStartup (HANDLE hDll, DWORD dwReason, LPVOID lpReserved) if (dwReason == DLL_PROCESS_ATTACH) { + /* Initialize private atexit table for this dll. + 32 is min size required by ANSI */ + + first_atexit = (p_atexit_fn*) malloc (32 * sizeof (p_atexit_fn)); + if (first_atexit == NULL ) /* can't allocate memory */ + { + errno=ENOMEM; + return FALSE; + } + *first_atexit = NULL; + next_atexit = first_atexit; + +#ifdef DEBUG + printf ("%s: DLL_PROCESS_ATTACH (%d)\n", __FUNCTION__); +#endif + + #ifdef __GNUC__ - /* From libgcc.a, calls global class constructors. */ + /* From libgcc.a, __main calls global class constructors, + __do_global_ctors, which registers __do_global_dtors + as the first entry of the private atexit table we + have just initialised */ __main (); + #endif - } + } /* - * Call the user-supplied DllMain subroutine + * Call the user-supplied DllMain subroutine. + * This has to come after initialization of atexit table and + * registration of global constructors. * NOTE: DllMain is optional, so libmingw32.a includes a stub * which will be used if the user does not supply one. */ + bRet = DllMain (hDll, dwReason, lpReserved); + /* Handle case where DllMain returns FALSE on attachment attempt. */ -#ifdef __GNUC__ - if (dwReason == DLL_PROCESS_DETACH) + if ( (dwReason == DLL_PROCESS_ATTACH) && !bRet) { - /* From libgcc.a, calls global class destructors. */ - __do_global_dtors (); - } +#ifdef DEBUG + printf ("%s: DLL_PROCESS_ATTACH failed, cleaning up\n", __FUNCTION__); #endif + __dll_exit (); /* Cleanup now. This will set first_atexit to NULL so we + know we've cleaned up */ + } + + if (dwReason == DLL_PROCESS_DETACH) + { +#ifdef DEBUG + printf ("%s: DLL_PROCESS_DETACH (%d)\n", __FUNCTION__); +#endif + /* If not attached, return FALSE. Cleanup already done above + if failed attachment attempt. */ + if (! first_atexit ) + bRet = FALSE; + else + /* + * We used to call __do_global_dtors () here. This is + * no longer necessary since __do_global_dtors is now + * registered at start (last out) of private atexit table. + */ + __dll_exit (); + } return bRet; } +static +void +__dll_exit(void) +/* Run LIFO terminators registered in private atexit table */ +{ + if ( first_atexit ) + { + p_atexit_fn* __last = next_atexit - 1; + while ( __last >= first_atexit ) + { + if ( *__last != NULL ) + { +#ifdef DEBUG + printf ("%s: Calling exit function 0x%x from 0x%x\n", + __FUNCTION__, (unsigned)(*__last),(unsigned)__last); +#endif + (**__last) (); + } + __last--; + } + free ( first_atexit ) ; + first_atexit = NULL ; + } + /* + Make sure output buffers opened by DllMain or + atexit-registered functions are flushed before detaching, + otherwise we can have problems with redirected output. + */ + fflush (NULL); +} + /* - * For the moment a dummy atexit. Atexit causes problems in DLLs, especially - * if they are dynamically loaded. For now atexit inside a DLL does nothing. - * NOTE: We need this even if the DLL author never calls atexit because - * the global constructor function __do_global_ctors called from __main - * will attempt to register __do_global_dtors using atexit. - * Thanks to Andrey A. Smirnov for pointing this one out. + * The atexit exported from msvcrt.dll causes problems in DLLs. + * Here, we override the exported version of atexit with one that passes the + * private table initialised in DllMainCRTStartup to __dllonexit. + * That means we have to hide the mscvrt.dll atexit because the + * atexit defined here gets __dllonexit from the same lib. */ + int -atexit (void (*pfn) ()) +atexit (p_atexit_fn pfn ) { - return 0; +#ifdef DEBUG + printf ("%s: registering exit function 0x%x at 0x%x\n", + __FUNCTION__, (unsigned)pfn, (unsigned)next_atexit); +#endif + return (__dllonexit (pfn, &first_atexit, &next_atexit) + == NULL ? -1 : 0 ); } +/* + * Likewise for non-ANSI function _onexit that may be called by + * code in the dll. + */ + +_onexit_t +_onexit (_onexit_t pfn ) +{ +#ifdef DEBUG + printf ("%s: registering exit function 0x%x at 0x%x\n", + __FUNCTION__, (unsigned)pfn, (unsigned)next_atexit); +#endif + return ((_onexit_t) __dllonexit ((p_atexit_fn)pfn, &first_atexit, &next_atexit)); +} |