From: Jim Meyering <jim@meyering.net>
Date: Sun, 16 Feb 2003 08:59:15 +0000 (+0000)
Subject: (MAP_ANONYMOUS): Use MAP_ANON, if possible.
X-Git-Tag: v4.5.8~99
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c276ca6e497fbaa246b210916a11b6b532998062;p=thirdparty%2Fcoreutils.git

(MAP_ANONYMOUS): Use MAP_ANON, if possible.
Initialize `fd' to -1, so Solaris' mmap works with MAP_ANON.
---

diff --git a/lib/mmap-stack.c b/lib/mmap-stack.c
index f060bba4ce..192cf2cf39 100644
--- a/lib/mmap-stack.c
+++ b/lib/mmap-stack.c
@@ -36,7 +36,11 @@
 #include "mmap-stack.h"
 
 #ifndef MAP_ANONYMOUS
-# define MAP_ANONYMOUS 0
+# ifdef MAP_ANON
+#  define MAP_ANONYMOUS MAP_ANON
+# else
+#  define MAP_ANONYMOUS 0
+# endif
 #endif
 
 /* Set up context, *CTX, so that it may be used via makecontext,
@@ -46,7 +50,7 @@ static int
 get_context (ucontext_t *ctx, size_t size)
 {
   void *stack;
-  int fd = 0;
+  int fd = -1;  /* This must be -1 in order for Solaris' MAP_ANON to work.  */
 
   if (getcontext (ctx))
     return 1;