Eliminate the static buffer used to read the first page of the mapped

object, and eliminate the pread(2) call as well [1]. Mmap the first
page of the object temporaly, and unmap it on error or last use.
Potentially, this leaves one-page gap between succeeding dlopen(3),
but there are other mmap(2) consumers as well.

Fix several cases were the whole mapping of the object leaked on error.

Use MAP_PREFAULT_READ for mmap(2) calls which map real object pages [2].

Insipired by the patch by:	Ian Lepore <freebsd damnhippie dyndns org> [1]
Suggested by:	alc [2]
MFC after:	2 weeks

0 files changed, 0 insertions, 0 deletions