cvs commit: src/include Makefile spawn.h unistd.h src/lib/libc/gen Makefile.inc Symbol.map exec.3 exec.c posix_spawn.c

[Maxim Sobolev]

John Baldwin wrote:
> On Tuesday 17 June 2008 11:15:20 am Maxim Sobolev wrote:
>> Ed Schouten wrote:
>>> * David Schultz <das at FreeBSD.ORG> wrote:
>>>> I have no objections to this, but doesn't it defeat the whole
>>>> purpose to implement posix_spawn() as a library function that just
>>>> calls fork/exec?
>>> When (if?) applications start to use posix_spawn() we may decide to move
>>> it into the kernel at any time. It should be okay for now.
>> Are there any benefits of doing it in the kernel vs. doing it via fork+exec?
> 
> Speed.  You don't have to go mark all your pages as COW or some such only to 
> turn around and throw the new mappings away and undo that.

Don't we have vfork() for that?

-Maxim