file_hlock.c

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/* low-level lock and unlock functions */

#include "../fb.h"
#include <io.h>
#include <windows.h>

#ifdef HOST_MINGW
        #define fileno _fileno
        #define get_osfhandle _get_osfhandle
#endif

int fb_hFileLock( FILE *f, fb_off_t inipos, fb_off_t size )
{
        return fb_ErrorSetNum( LockFile( (HANDLE)get_osfhandle( fileno( f ) ), inipos, 0, size, 0 ) == TRUE ?
                               FB_RTERROR_OK : FB_RTERROR_FILEIO );
}

int fb_hFileUnlock( FILE *f, fb_off_t inipos, fb_off_t size )
{
        return fb_ErrorSetNum( UnlockFile( (HANDLE)get_osfhandle( fileno( f ) ), inipos, 0, size, 0 ) == TRUE ?
                               FB_RTERROR_OK : FB_RTERROR_FILEIO );
}