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EnigmA Amiga Run 1999 March
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EnigmA AMIGA RUN 35 (1999)(G.R. Edizioni)(IT)[!][issue 1999-03].iso
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clib37x.lha
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StartUp.c
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C/C++ Source or Header
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1998-03-18
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10KB
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307 lines
/*
** $VER: StartUp.c 37.31 (18.3.98)
**
** Library startup-code and function table definition
**
** (C) Copyright 1996-98 Andreas R. Kleinert
** All Rights Reserved.
*/
#define __USE_SYSBASE // perhaps only recognized by SAS/C
#include <exec/types.h>
#include <exec/memory.h>
#include <exec/libraries.h>
#include <exec/execbase.h>
#include <exec/resident.h>
#include <exec/initializers.h>
#ifdef __MAXON__
#include <pragma/exec_lib.h>
#include <linkerfunc.h>
#else
#include <proto/exec.h> // all other compilers
#endif
#include "compiler.h"
#ifdef __GNUC__
#include "../include/example/examplebase.h"
#elif VBCC
#include "include/example/examplebase.h"
#else
#include "/include/example/examplebase.h"
#endif
#include "SampleFuncs.h"
extern ULONG __saveds __stdargs L_OpenLibs(struct ExampleBase *ExampleBase);
extern void __saveds __stdargs L_CloseLibs(void);
struct ExampleBase * __saveds ASM InitLib( register __a6 struct ExecBase *sysbase GNUCREG(a6),
register __a0 SEGLISTPTR seglist GNUCREG(a0),
register __d0 struct ExampleBase *exb GNUCREG(d0));
struct ExampleBase * __saveds ASM OpenLib( register __a6 struct ExampleBase *ExampleBase GNUCREG(a6));
SEGLISTPTR __saveds ASM CloseLib( register __a6 struct ExampleBase *ExampleBase GNUCREG(a6));
SEGLISTPTR __saveds ASM ExpungeLib( register __a6 struct ExampleBase *exb GNUCREG(a6));
ULONG ASM ExtFuncLib(void);
/* ----------------------------------------------------------------------------------------
! LibStart:
!
! If someone tries to start a library as an executable, it must return (LONG) -1
! as result. That's what we are doing here.
---------------------------------------------------------------------------------------- */
LONG ASM LibStart(void)
{
return(-1);
}
/* ----------------------------------------------------------------------------------------
! Function and Data Tables:
!
! The function and data tables have been placed here for traditional reasons.
! Placing the RomTag structure before (-> LibInit.c) would also be a good idea,
! but it depends on whether you would like to keep the "version" stuff separately.
---------------------------------------------------------------------------------------- */
extern APTR FuncTab [];
/* extern struct MyDataInit DataTab; */
extern DataTab; /* DICE fix */
/* Instead you may place ROMTag + Datatab directly, here */
/* (see LibInit.c). This may fix "Installer" version */
/* checking problems, too - try it. */
struct InitTable /* do not change */
{
ULONG LibBaseSize;
APTR *FunctionTable;
struct MyDataInit *DataTable;
APTR InitLibTable;
} InitTab =
{
(ULONG) sizeof(struct ExampleBase),
(APTR *) &FuncTab[0],
(struct MyDataInit *) &DataTab,
(APTR) InitLib
};
APTR FuncTab [] =
{
OpenLib,
CloseLib,
ExpungeLib,
ExtFuncLib,
EXF_TestRequest, /* add your own functions here */
(APTR) ((LONG)-1)
};
extern struct ExampleBase *ExampleBase;
/* ----------------------------------------------------------------------------------------
! InitLib:
!
! This one is single-threaded by the Ramlib process. Theoretically you can do, what
! you like here, since you have full exclusive control over all the library code and data.
! But due to some bugs in Ramlib V37-40, you can easily cause a deadlock when opening
! certain libraries here (which open other libraries, that open other libraries, that...)
!
---------------------------------------------------------------------------------------- */
struct ExampleBase * __saveds ASM InitLib( register __a6 struct ExecBase *sysbase GNUCREG(a6),
register __a0 SEGLISTPTR seglist GNUCREG(a0),
register __d0 struct ExampleBase *exb GNUCREG(d0))
{
ExampleBase = exb;
ExampleBase->exb_SysBase = sysbase;
ExampleBase->exb_SegList = seglist;
if(L_OpenLibs(ExampleBase)) return(ExampleBase);
L_CloseLibs();
{
ULONG negsize, possize, fullsize;
UBYTE *negptr = (UBYTE *) ExampleBase;
negsize = ExampleBase->exb_LibNode.lib_NegSize;
possize = ExampleBase->exb_LibNode.lib_PosSize;
fullsize = negsize + possize;
negptr -= negsize;
FreeMem(negptr, fullsize);
#ifdef __MAXON__
CleanupModules();
#endif
}
return(NULL);
}
/* ----------------------------------------------------------------------------------------
! OpenLib:
!
! This one is enclosed within a Forbid/Permit pair by Exec V37-40. Since a Wait() call
! would break this Forbid/Permit(), you are not allowed to start any operations that
! may cause a Wait() during their processing. It's possible, that future OS versions
! won't turn the multi-tasking off, but instead use semaphore protection for this
! function.
!
! Currently you only can bypass this restriction by supplying your own semaphore
! mechanism.
---------------------------------------------------------------------------------------- */
struct ExampleBase * __saveds ASM OpenLib( register __a6 struct ExampleBase *ExampleBase GNUCREG(a6))
{
#ifdef __MAXON__
GetBaseReg();
InitModules();
#endif
ExampleBase->exb_LibNode.lib_OpenCnt++;
ExampleBase->exb_LibNode.lib_Flags &= ~LIBF_DELEXP;
return(ExampleBase);
}
/* ----------------------------------------------------------------------------------------
! CloseLib:
!
! This one is enclosed within a Forbid/Permit pair by Exec V37-40. Since a Wait() call
! would break this Forbid/Permit(), you are not allowed to start any operations that
! may cause a Wait() during their processing. It's possible, that future OS versions
! won't turn the multi-tasking off, but instead use semaphore protection for this
! function.
!
! Currently you only can bypass this restriction by supplying your own semaphore
! mechanism.
---------------------------------------------------------------------------------------- */
SEGLISTPTR __saveds ASM CloseLib( register __a6 struct ExampleBase *ExampleBase GNUCREG(a6))
{
ExampleBase->exb_LibNode.lib_OpenCnt--;
if(!ExampleBase->exb_LibNode.lib_OpenCnt)
{
if(ExampleBase->exb_LibNode.lib_Flags & LIBF_DELEXP)
{
return( ExpungeLib(ExampleBase) );
}
}
return(NULL);
}
/* ----------------------------------------------------------------------------------------
! ExpungeLib:
!
! This one is enclosed within a Forbid/Permit pair by Exec V37-40. Since a Wait() call
! would break this Forbid/Permit(), you are not allowed to start any operations that
! may cause a Wait() during their processing. It's possible, that future OS versions
! won't turn the multi-tasking off, but instead use semaphore protection for this
! function.
!
! Currently you only could bypass this restriction by supplying your own semaphore
! mechanism - but since expunging can't be done twice, one should avoid it here.
---------------------------------------------------------------------------------------- */
SEGLISTPTR __saveds ASM ExpungeLib( register __a6 struct ExampleBase *exb GNUCREG(a6))
{
struct ExampleBase *ExampleBase = exb;
SEGLISTPTR seglist;
if(!ExampleBase->exb_LibNode.lib_OpenCnt)
{
ULONG negsize, possize, fullsize;
UBYTE *negptr = (UBYTE *) ExampleBase;
seglist = ExampleBase->exb_SegList;
Remove((struct Node *)ExampleBase);
L_CloseLibs();
negsize = ExampleBase->exb_LibNode.lib_NegSize;
possize = ExampleBase->exb_LibNode.lib_PosSize;
fullsize = negsize + possize;
negptr -= negsize;
FreeMem(negptr, fullsize);
#ifdef __MAXON__
CleanupModules();
#endif
return(seglist);
}
ExampleBase->exb_LibNode.lib_Flags |= LIBF_DELEXP;
return(NULL);
}
/* ----------------------------------------------------------------------------------------
! ExtFunct:
!
! This one is enclosed within a Forbid/Permit pair by Exec V37-40. Since a Wait() call
! would break this Forbid/Permit(), you are not allowed to start any operations that
! may cause a Wait() during their processing. It's possible, that future OS versions
! won't turn the multi-tasking off, but instead use semaphore protection for this
! function.
!
! Currently you only can bypass this restriction by supplying your own semaphore
! mechanism - but since this function currently is unused, you should not touch
! it, either.
---------------------------------------------------------------------------------------- */
ULONG ASM ExtFuncLib(void)
{
return(NULL);
}
struct ExampleBase *ExampleBase = NULL;
/* ----------------------------------------------------------------------------------------
! __SASC stuff:
!
! This is only for SAS/C - its intention is to turn off internal CTRL-C handling
! for standard C functions and to avoid calls to exit() et al.
---------------------------------------------------------------------------------------- */
#ifdef __SASC
#ifdef ARK_OLD_STDIO_FIX
ULONG XCEXIT = NULL; /* These symbols may be referenced by */
ULONG _XCEXIT = NULL; /* some functions of sc.lib, but should */
ULONG ONBREAK = NULL; /* never be used inside a shared library */
ULONG _ONBREAK = NULL;
ULONG base = NULL; /* Note, that XCEXIT/ONBREAK actually */
ULONG _base = NULL; /* should have been defined as functions */
ULONG ProgramName = NULL; /* and not as ULONGs... */
ULONG _ProgramName = NULL;
ULONG StackPtr = NULL;
ULONG _StackPtr = NULL;
ULONG oserr = NULL;
ULONG _oserr = NULL;
ULONG OSERR = NULL;
ULONG _OSERR = NULL;
#endif /* ARK_OLD_STDIO_FIX */
void __regargs __chkabort(void) { } /* a shared library cannot be */
void __regargs _CXBRK(void) { } /* CTRL-C aborted when doing I/O */
#endif /* __SASC */