C-ISAM in sco unix

UNIX SCO
1

Hi every body

I'm trying to call transaction function (isbegin() , iscommit() , isrollback() )
in C-ISAM 3.26 in sco unix 5.0.6 :

 isbegin\(\);
 fd = isopen\(filename,mode\)
 iswrite\(fd, record\);
 isrollback\(\);

in C-ISAM 7.2 documentation mode must be plus by 4 in transactional operation, but My C-ISAM library can't support this mode.

Is there any one to help me ?

thanks