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Subject: Re: compilation of sqlite3 on dos using djgpp
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From: "Frank Sapone (emoaddict15 AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
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On 2/22/2023 9:57 AM, HILMAN AHWAS A. (hilmanahwaa AT gmail DOT com) [via 
djgpp AT delorie DOT 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?

According to Georg's instructions sqlite3.c from the source code.

Frank