October 2007
Intermediate to advanced
1308 pages
161h 13m
English
Content preview from sendmail, 4th EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
FORK
The type of fork to use Port, edit sendmail/conf.h
The sendmail program forks often to do its job in the most efficient way possible. Prior to V8.8, sendmail used vfork(2) whenever possible. Beginning with V8.8, sendmail now defaults to fork(2).[52] You should have to redefine FORK only when porting to a new system or when you are certain that vfork(2) is, indeed, faster on your system and is reliable. To add it to sendmail (and other programs that use FORK), place a line such as the following in your Build m4 file:
APPENDDEF(`confENVDEF', `-DFORK=vfork')
You can test with the preceding confENVDEF statement
and, if successful, put a permanent porting entry
into sendmail/conf.h. New ports
should be reported to
sendmail@sendmail.org so that they
can be folded into future releases.
[52] * Bugs in the interaction between NIS and vfork(2) at the system level with Solaris and systems that lacked vfork(2) altogether, such as IRIX, caused V8.8 to favor fork(2). This is really OK because in modern systems, fork(2) is just as fast as vfork(2).
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.