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devel / comp.os.msdos.djgpp / Re: compilation of sqlite3 on dos using djgpp

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* Re: compilation of sqlite3 on dos using djgppgnufan42 (gnufan42@protonmail.com) [via djgpp@delorie.com]
`- Re: compilation of sqlite3 on dos using djgppRayeR

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Re: compilation of sqlite3 on dos using djgpp

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From: djgpp@delorie.com (gnufan42 (gnufan42@protonmail.com) [via djgpp@delorie.com])
Subject: Re: compilation of sqlite3 on dos using djgpp
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 by: gnufan42 (gnufan42@p - Sat, 5 Aug 2023 11:58 UTC

------- Original Message -------
On Wednesday, February 22nd, 2023 at PM 10:57, HILMAN AHWAS A. (hilmanahwaa@gmail.com) [via djgpp@delorie.com] <djgpp@delorie.com> wrote:

> On Monday, February 18, 2013 at 2:02:33 AM UTC+7, <@email omitted> wrote:
>
> > Well, on a lazy Sunday afternoon I tried to compile SQLite too.
> >
> > The following steps allowed to compile it:
> >
> > 1. run "configure --disable-threadsafe"
> >
> > 2. modify this in sqlite3.c:
> >
> > #ifdef DJGPP
> > { "fstat", 0, 0 },
> > //#define osFstat(a,b,c) 0
> > #define osFstat(a,b) 0 //djgpp - replacing above
> > #define MAP_SHARED 0
> > #define MAP_FAILED 0
> > #define ETIMEDOUT 9000 //unused number
> > #define ENOTCONN 9001 //unused number
> >
> > #else
> >
> > 3. take out munmap:
> >
> > for(i=0; i<p->nRegion; i++){
> > if( p->h>=0 ){
> > //djgpp munmap(p->apRegion[i], p->szRegion);
> > }else{
> > sqlite3_free(p->apRegion[i]);
> > }
> > }
> >
> > 4. take out mmap:
> >
> > if( pShmNode->h>=0 ){
> > /* djgpp
> > pMem = mmap(0, szRegion,
> > pShmNode->isReadonly ? PROT_READ : PROT_READ|PROT_WRITE,
> > MAP_SHARED, pShmNode->h, szRegion*(i64)pShmNode->nRegion
> > );
> > */
> > if( pMem==MAP_FAILED ){
> > rc = unixLogError(SQLITE_IOERR_SHMMAP, "mmap", pShmNode->zFilename);
> > goto shmpage_out;
> > }
> >
> > Then it did compile and seemed to work so far. The library does not use mmap, only the shell program sqlite3.exe does and I guess that will work so far without mmap in DOS.
> >
> > Georg
>
>
> Where do I place those lines of code?

Why wasn't mmap implemented in the first place?

Re: compilation of sqlite3 on dos using djgpp

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 by: RayeR - Tue, 3 Oct 2023 01:38 UTC

> > Why wasn't mmap implemented in the first place?
> Because DPMI 0.9 doesn't support the required functionality, AFAIR.

CWSDPMI supports some DPMI 1.0 functions. I implemented a subset of mmap for DOS port of NVclock utility via the __djgpp_map_physical_memory()

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