From: Shawn O. Pearce <spearce@spearce.org>
Date: Sun, 24 Dec 2006 05:45:47 +0000 (-0500)
Subject: Switch git_mmap to use pread.
X-Git-Tag: v1.5.0-rc0~16
X-Git-Url: https://git.lorimer.id.au/gitweb.git/diff_plain/8e554429e8a9dbb5dba6b8aeca66fc27c0bb5538?hp=8e554429e8a9dbb5dba6b8aeca66fc27c0bb5538

Switch git_mmap to use pread.

Now that Git depends on pread in index-pack its safe to say we can
also depend on it within the git_mmap emulation we activate when
NO_MMAP is set.  On most systems pread should be slightly faster
than an lseek/read/lseek sequence as its one system call vs. three
system calls.

We also now honor EAGAIN and EINTR error codes from pread and
restart the prior read.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
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