bent@lccinc.UUCP (Ben Taylor) (01/26/91)
I am currently working on getting tcl working under Xenix, and have solved some initial problems. However, not having much berkeley background, I am unfamiliar with vfork. I know what its supposed to do, but I'm not sure how to make Xenix simulate it. Anyone have suggestions? Ben Taylor Systems Administrator LCC Incorporated uunet!lccinc!bent
cpcahil@virtech.uucp (Conor P. Cahill) (01/26/91)
In article <345@lccinc.UUCP> bent@lccinc.UUCP (Ben Taylor) writes: >I am currently working on getting tcl working under Xenix, and have solved >some initial problems. However, not having much berkeley background, >I am unfamiliar with vfork. I know what its supposed to do, but I'm >not sure how to make Xenix simulate it. Anyone have suggestions? You can usually just #define vfork fork. HOWEVER, if they were tricky about changing variables following the vfork, this may not work. If all they do is exec a different program the #def will be fine. If they did modify viriables following the vfork, you are out of luck (it can't be emulated cleanly under Xenix). -- Conor P. Cahill (703)430-9247 Virtual Technologies, Inc. uunet!virtech!cpcahil 46030 Manekin Plaza, Suite 160 Sterling, VA 22170
rbj@uunet.UU.NET (Root Boy Jim) (01/26/91)
In article <345@lccinc.UUCP> bent@lccinc.UUCP (Ben Taylor) writes: >I am unfamiliar with vfork. I'm not sure how to make Xenix simulate it. #define vfork fork -- Root Boy Jim Cottrell <rbj@uunet.uu.net> Close the gap of the dark year in between
jim@newmedia.UUCP (Jim Beveridge) (01/28/91)
In article <345@lccinc.UUCP>, bent@lccinc.UUCP (Ben Taylor) writes: > I am currently working on getting tcl working under Xenix, and have solved > some initial problems. However, not having much berkeley background, > I am unfamiliar with vfork. I know what its supposed to do, but I'm > not sure how to make Xenix simulate it. Anyone have suggestions? vfork() gives you some performance gains over fork(). From the SunOS 4.1 manual, we get, "vfork() can be used to create new processes without fully copying the address space of the old process, which is horrendously inefficient in a paged environment. It is useful when the purpose of fork() would have been to create a new system context for execve." The simplest solution is: #define vfork fork Jim