git: libc: Do not set errno when mmap(MAP_TRYFIXED) fails.

[Rimvydas Jasinskas]

commit e00a0047a7ca4a967f6623f6108883a3bdbce1a6
Author: zrj <rimvydas.jasinskas at gmail.com>
Date:   Tue Apr 12 13:16:05 2016 +0300

    libc: Do not set errno when mmap(MAP_TRYFIXED) fails.
    
    If this mmap call fails, we'll fall back to moving the allocation to
    a different virtual address. Setting errno here might result in
    functions further up the call stack misinterpreting an error condition.
    
    Indeed, this surfaced in git's calling of getdelim() in a loop, where
    getdelim() would return -1 at EOF, but the caller would find ENOMEM in
    errno from a previous, successful, call and interpret that as an OOM.
    
    Fix-to: 07a8ffeaab3fc830679c6836a6ee198ad1a3275f
    
    Suggested-by: aggelos

Summary of changes:
 lib/libc/stdlib/nmalloc.c | 2 ++
 1 file changed, 2 insertions(+)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/e00a0047a7ca4a967f6623f6108883a3bdbce1a6


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