mmap() question

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1 total messages Started by Dawson R. Engler Mon, 11 Jan 1993 04:58

#6992

Author: Dawson R. Engler
Date: Mon, 11 Jan 1993 04:58

17 lines
980 bytes

Is it possible to mmap() shared memory *after* a fork() occurs?
The trouble with the man pages I've seen on mmap() is that
they imply all mappings must occur before fork().  An obvious problem
with this is that if I run out of shared memory and need more, using
mmap() to replenish may be difficult.

Do I have to pass open file descriptors between children if I want to
do this?  (ie. process A needs more memory, it opens a file, maps it
and then sends the file descriptor to process B, who will in turn will
map)

A simple, portable solution would be ideal. (what a surprise...;)

Regards,
	Dawson
	engler@cs.arizona.edu

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