519 lines
14 KiB
C
519 lines
14 KiB
C
/***
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*crt0dat.c - 32-bit C run-time initialization/termination routines
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*
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* Copyright (c) 1986-1992, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* This module contains the routines _cinit, exit, and _exit
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* for C run-time startup and termination. _cinit and exit
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* are called from the _astart code in crt0.asm.
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* This module also defines several data variables used by the
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* runtime.
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*
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* [NOTE: Lock segment definitions are at end of module.]
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*
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* *** FLOATING POINT INITIALIZATION AND TERMINATION ARE NOT ***
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* *** YET IMPLEMENTED IN THIS FILE ***
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*
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*Revision History:
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* 06-28-89 PHG Module created, based on asm version
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* 04-09-90 GJF Added #include <cruntime.h>. Made calling type
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* explicit (_CALLTYPE1 or _CALLTYPE4). Also, fixed
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* the copyright.
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* 04-10-90 GJF Fixed compiler warnings (-W3).
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* 05-21-90 GJF Added #undef _NFILE_ (temporary hack) and fixed the
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* indents.
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* 08-31-90 GJF Removed 32 from API names.
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* 09-25-90 GJF Merged tree version with local (8-31 and 5-21 changes).
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* 10-08-90 GJF New-style function declarators.
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* 10-12-90 GJF Removed divide by 0 stuff.
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* 10-18-90 GJF Added _pipech[] array.
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* 11-05-90 GJF Added _umaskval.
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* 12-04-90 GJF Added _osfinfo[] definition for Win32 target. Note that
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* the Win32 support is still incomplete!
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* 12-04-90 SRW Changed to include <oscalls.h> instead of <doscalls.h>
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* 12-04-90 SRW Added _osfile back for win32. Changed _osfinfo from
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* an array of structures to an array of 32-bit handles
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* (_osfhnd)
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* 12-28-90 SRW Added _CRUISER_ conditional around pack pragmas
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* 01-29-91 GJF ANSI naming.
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* 01-29-91 SRW Added call to GetFileType [_WIN32_]
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* 02-18-91 SRW Removed duplicate defintion of _NFILE_ (see os2dll.h)
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* 04-04-91 GJF Added definitions for _base[version|major|minor]
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* (_WIN32_).
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* 04-08-91 GJF Temporary hack for Win32/DOS folks - added HeapDestroy
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* call to doexit to tear down the OS heap used by C
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* heap.
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* 04-09-91 PNT Added _MAC_ conditional
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* 04-26-91 SRW Removed level 3 warnings
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* 07-16-91 GJF Added fp initialization test-and-call [_WIN32_].
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* 07-26-91 GJF Revised initialization and termination stuff. In
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* particular, removed need for win32ini.c [_WIN32_].
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* 08-07-91 GJF Added init. for FORTRAN runtime, if present [_WIN32_].
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* 08-21-91 GJF Test _prmtmp against NULL, not _prmtmp().
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* 08-21-91 JCR Added _exitflag, _endstdio, _cpumode, etc.
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* 09-09-91 GJF Revised _doinitterm for C++ init. support and to make
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* _onexit/atexit compatible with C++ needs.
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* 09-16-91 GJF Must test __onexitend before calling _doinitterm.
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* 10-29-91 GJF Force in floating point initialization for MIPS
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* compiler [_WIN32_].
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* 11-13-91 GJF FORTRAN needs _onexit/atexit init. before call thru
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* _pFFinit.
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* 01-10-92 GJF Merged. Also, added _C_Termination_Done [_WIN32_].
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* 02-13-92 GJF Moved all lowio initialization to ioinit.c for Win32.
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* 03-12-92 SKS Major changes to initialization/termination scheme
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* 04-16-92 DJM POSIX support.
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* 04-17-92 SKS Export _initterm() for CRTDLL model
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* 05-07-92 DJM Removed _exit() from POSIX build.
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* 06-03-92 GJF Temporarily restored call to FORTRAN init.
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* 08-26-92 SKS Add _osver, _winver, _winmajor, _winminor
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* 08-28-92 GJF Use unistd.h for POSIX build.
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* 09-02-92 SKS Fix _onexit table traversal to be LIFO.
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* Since table is built forward (my changes 03-12-92)
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* the table must be traversed in reverse order.
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* 10-30-92 TVB Force in floating point initialization for ALPHA
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* compiler as was done for MIPS. [_WIN32_].
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* 11-12-92 SKS Remove hard-coded call to FORTRAN initializer
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* 05-11-93 SKS _C_Termination_Done is now used by DLLs in LIBC/LIBCMT
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* models, not just in CRTDLL.DLL.
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* Remove obsolete variable _child.
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* 07-16-93 SRW ALPHA Merge
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*
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*******************************************************************************/
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#include <windows.h>
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#include <cruntime.h>
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#include <internal.h>
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#include <os2dll.h>
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/* callable exit flag */
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char _exitflag = 0;
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/*
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* flag indicating if C runtime termination has been done. set if exit,
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* _exit, _cexit or _c_exit has been called. checked when _CRTDLL_INIT
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* or user DLL's _CRT_INIT is called with DLL_PROCESS_DETACH.
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*/
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int _C_Termination_Done = FALSE;
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/*
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* useful type for initialization and termination declarations
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*/
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typedef void (_CALLTYPE1 *PF)(void);
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/*
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* NOTE: THE USE OF THE POINTERS DECLARED BELOW DEPENDS ON THE PROPERTIES
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* OF C COMMUNAL VARIABLES. SPECIFICALLY, THEY ARE NON-NULL IFF THERE EXISTS
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* A DEFINITION ELSEWHERE INITIALIZING THEM TO NON-NULL VALUES.
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*/
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/*
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* pointers to initialization functions
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*/
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PF _FPinit; /* floating point init. */
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/*
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* pointers to initialization sections
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*/
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extern PF __xi_a[], __xi_z[]; /* C initializers */
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extern PF __xc_a[], __xc_z[]; /* C++ initializers */
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extern PF __xp_a[], __xp_z[]; /* C pre-terminators */
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extern PF __xt_a[], __xt_z[]; /* C terminators */
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#if defined(_M_MRX000) || defined(_M_ALPHA) || defined(_M_PPC)
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/*
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* For MIPS or ALPHA compilers, must explicitly force in and call the floating
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* point initialization (those system always have floating-point hardware).
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*/
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extern void _CALLTYPE1 _fpmath(void);
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#endif
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/*
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* pointers to the start and finish of the _onexit/atexit table
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*/
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PF *__onexitbegin;
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PF *__onexitend;
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/*
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* static (internal) function that walks a table of function pointers,
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* calling each entry between the two pointers, skipping NULL entries
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*
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* Needs to be exported for CRT DLL so that C++ initializers in the
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* client EXE / DLLs can be initialized
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*/
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void _CALLTYPE4 _initterm(PF *, PF *);
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#pragma data_seg()
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/***
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*_cinit - C initialization
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*
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*Purpose:
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* This routine performs the shared DOS and Windows initialization.
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* The following order of initialization must be preserved -
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*
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ifdef MTHREAD
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* 0. Call OS2 to bump max file count (mthread only)
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endif
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* 1. Check for devices for file handles 0 - 2
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* 2. Integer divide interrupt vector setup
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* 3. General C initializer routines
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*
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*Entry:
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* No parameters: Called from __crtstart and assumes data
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* set up correctly there.
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*
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*Exit:
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* Initializes C runtime data.
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*
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*Exceptions:
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*
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*******************************************************************************/
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void _CALLTYPE1 _cinit (
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void
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)
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{
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/*
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* initialize floating point package, if present
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*/
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#if defined(_M_MRX000) || defined(_M_ALPHA) || defined(_M_PPC)
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/*
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* The Mips, Alpha, and PPC compilers don't emit external reference to
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* _fltused. Therefore, must always force in the floating point
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* initialization.
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*/
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_fpmath();
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#else
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if ( _FPinit != NULL )
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(*_FPinit)();
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#endif
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/*
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* do initializations
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*/
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_initterm( __xi_a, __xi_z );
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/*
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* do C++ initializations
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*/
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_initterm( __xc_a, __xc_z );
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}
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/***
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*exit(status), _exit(status), _cexit(void), _c_exit(void) - C termination
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*
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*Purpose:
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*
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* Entry points:
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*
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* exit(code): Performs all the C termination functions
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* and terminates the process with the return code
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* supplied by the user.
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*
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* _exit(code): Performs a quick exit routine that does not
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* do certain 'high-level' exit processing. The _exit
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* routine terminates the process with the return code
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* supplied by the user.
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*
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* _cexit(): Performs the same C lib termination processing
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* as exit(code) but returns control to the caller
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* when done (i.e., does NOT terminate the process).
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*
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* _c_exit(): Performs the same C lib termination processing
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* as _exit(code) but returns control to the caller
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* when done (i.e., does NOT terminate the process).
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*
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* Termination actions:
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*
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* exit(), _cexit():
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*
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* 1. call user's terminator routines
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* 2. call C runtime preterminators
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*
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* _exit(), _c_exit():
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*
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* 3. call C runtime terminators
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* 4. return to DOS or caller
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*
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* Notes:
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*
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* The termination sequence is complicated due to the multiple entry
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* points sharing the common code body while having different entry/exit
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* sequences.
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*
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* Multi-thread notes:
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*
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* 1. exit() should NEVER be called when mthread locks are held.
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* The exit() routine can make calls that try to get mthread locks.
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*
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* 2. _exit()/_c_exit() can be called from anywhere, with or without locks held.
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* Thus, _exit() can NEVER try to get locks (otherwise, deadlock
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* may occur). _exit() should always 'work' (i.e., the process
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* should always terminate successfully).
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*
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* 3. Only one thread is allowed into the exit code (see _lockexit()
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* and _unlockexit() routines).
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*
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*Entry:
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* exit(), _exit()
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* int status - exit status (0-255)
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*
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* _cexit(), _c_exit()
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* <no input>
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*
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*Exit:
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* exit(), _exit()
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* <EXIT to DOS>
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*
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* _cexit(), _c_exit()
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* Return to caller
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*
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*Uses:
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*
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*Exceptions:
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*
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*******************************************************************************/
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/* worker routine prototype */
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static void _CALLTYPE4 doexit (int code, int quick, int retcaller);
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void _CALLTYPE1 exit (
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int code
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)
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{
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doexit(code, 0, 0); /* full term, kill process */
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}
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#ifndef _POSIX_
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void _CALLTYPE1 _exit (
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int code
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)
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{
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doexit(code, 1, 0); /* quick term, kill process */
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}
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void _CALLTYPE1 _cexit (
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void
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)
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{
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doexit(0, 0, 1); /* full term, return to caller */
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}
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void _CALLTYPE1 _c_exit (
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void
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)
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{
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doexit(0, 1, 1); /* quick term, return to caller */
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}
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#endif /* _POSIX_ */
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static void _CALLTYPE4 doexit (
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int code,
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int quick,
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int retcaller
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)
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{
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_lockexit(); /* assure only 1 thread in exit path */
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/* save callable exit flag (for use by terminators) */
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_exitflag = (char) retcaller; /* 0 = term, !0 = callable exit */
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if (!quick) {
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/*
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* do _onexit/atexit() terminators
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* (if there are any)
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*
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* These terminators MUST be executed in reverse order (LIFO)!
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*
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* NOTE:
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* This code assumes that __onexitbegin points
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* to the first valid onexit() entry and that
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* __onexitend points past the last valid entry.
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* If __onexitbegin == __onexitend, the table
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* is empty and there are no routines to call.
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*/
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if (__onexitbegin) {
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PF * pfend = __onexitend;
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while ( -- pfend >= __onexitbegin )
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/*
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* if current table entry is non-NULL,
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* call thru it.
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*/
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if ( *pfend != NULL )
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(**pfend)();
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}
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/*
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* do pre-terminators
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*/
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_initterm(__xp_a, __xp_z);
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}
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/*
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* do terminators
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*/
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_initterm(__xt_a, __xt_z);
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/********** FLOATING POINT TERMINATION SHOULD GO HERE ************/
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/* return to OS/2 or to caller */
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if (retcaller) {
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_unlockexit(); /* unlock the exit code path */
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return;
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}
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ExitProcess(code);
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}
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/***
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* _lockexit - Aquire the exit code lock
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*
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*Purpose:
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* Makes sure only one thread is in the exit code at a time.
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* If a thread is already in the exit code, it must be allowed
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* to continue. All other threads must pend.
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*
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* Notes:
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*
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* (1) It is legal for a thread that already has the lock to
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* try and get it again(!). That is, consider the following
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* sequence:
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*
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* (a) program calls exit()
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* (b) thread locks exit code
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* (c) user onexit() routine calls _exit()
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* (d) same thread tries to lock exit code
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*
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* Since _exit() must ALWAYS be able to work (i.e., can be called
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* from anywhere with no regard for locking), we must make sure the
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* program does not deadlock at step (d) above.
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*
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* (2) If a thread executing exit() or _exit() aquires the exit lock,
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* other threads trying to get the lock will pend forever. That is,
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* since exit() and _exit() terminate the process, there is not need
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* for them to unlock the exit code path.
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*
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* (3) Note that onexit()/atexit() routines call _lockexit/_unlockexit
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* to protect mthread access to the onexit table.
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*
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* (4) The _lockexit/_unlockexit routines are very complicated in 286
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* OS/2 since a thread that held a lock could not request the lock again.
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* The 32-bit OS/2 semaphore calls DO allow a single thread to aquire the
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* same lock multiple times* thus, this version is straight forward.
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*
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*Entry: <none>
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*
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*Exit:
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* Calling thread has exit code path locked on return.
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*
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*Exceptions:
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*
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*******************************************************************************/
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void _CALLTYPE1 _lockexit (
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void
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)
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{
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_mlock(_EXIT_LOCK1);
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}
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/***
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* _unlockexit - Release exit code lock
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*
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*Purpose:
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* [See _lockexit() description above.]
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*
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* This routine is called by _cexit(), _c_exit(), and onexit()/atexit().
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* The exit() and _exit() routines never unlock the exit code path since
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* they are terminating the process.
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*
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*Entry:
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* Exit code path is unlocked.
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*
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*Exit:
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*
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*Exceptions:
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*
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*******************************************************************************/
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void _CALLTYPE1 _unlockexit (
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void
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)
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{
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_munlock(_EXIT_LOCK1);
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}
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/***
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* static void _initterm(PF * pfbegin, PF * pfend) - call entries in
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* function pointer table
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*
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*Purpose:
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* Walk a table of function pointers, calling each entry, as follows:
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*
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* 1. walk from beginning to end, pfunctbl is assumed to point
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* to the beginning of the table, which is currently a null entry,
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* as is the end entry.
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* 2. skip NULL entries
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* 3. stop walking when the end of the table is encountered
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*
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*Entry:
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* PF *pfbegin - pointer to the beginning of the table (first valid entry).
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* PF *pfend - pointer to the end of the table (after last valid entry).
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*
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*Exit:
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* No return value
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*
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*Notes:
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* This routine must be exported in the CRT DLL model so that the client
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* EXE and client DLL(s) can call it to initialize their C++ constructors.
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*
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*Exceptions:
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* If either pfbegin or pfend is NULL, or invalid, all bets are off!
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*
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*******************************************************************************/
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void _CALLTYPE4 _initterm (
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PF * pfbegin,
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PF * pfend
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)
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{
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/*
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* walk the table of function pointers from the bottom up, until
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* the end is encountered. Do not skip the first entry. The initial
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* value of pfbegin points to the first valid entry. Do not try to
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* execute what pfend points to. Only entries before pfend are valid.
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*/
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while ( pfbegin < pfend )
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{
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/*
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* if current table entry is non-NULL, call thru it.
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*/
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if ( *pfbegin != NULL )
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(**pfbegin)();
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++pfbegin;
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}
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}
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