From: Amos Jeffries <squid3@treenet.co.nz>
Date: Fri, 26 Apr 2013 04:12:14 +0000 (-0600)
Subject: GNU Hurd: define MAP_NORESERVE as no-op when missing
X-Git-Tag: SQUID_3_2_10~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b2cb6b52a9b72bb2e797109d539f01b083911f67;p=thirdparty%2Fsquid.git

GNU Hurd: define MAP_NORESERVE as no-op when missing

Some systems like GNU Hurd provide the mmap() API but lack MAP_NORESERVE
support. This option is an optimization, so we can define the macro
ourselves to nil and apparently not suffer (many) bad side effects.
---

diff --git a/src/DiskIO/Mmapped/MmappedFile.cc b/src/DiskIO/Mmapped/MmappedFile.cc
index 2501d73e9e..7a215bec88 100644
--- a/src/DiskIO/Mmapped/MmappedFile.cc
+++ b/src/DiskIO/Mmapped/MmappedFile.cc
@@ -11,6 +11,11 @@
 #include "DiskIO/WriteRequest.h"
 #include <sys/mman.h>
 
+// Some systems such as Hurd provide mmap() API but do not support MAP_NORESERVE
+#ifndef MAP_NORESERVE
+#define MAP_NORESERVE 0
+#endif
+
 CBDATA_CLASS_INIT(MmappedFile);
 
 // helper class to deal with mmap(2) offset alignment and other low-level specs