From: Ian Lance Taylor <ian@gcc.gnu.org>
Date: Sat, 29 Jan 2011 07:16:20 +0000 (+0000)
Subject: re PR go/47515 (Issues porting libgo to IRIX 6.5)
X-Git-Tag: releases/gcc-4.6.0~883
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=ca7174cf5ce7f23e06aa453e2d632ed5e4eac867;p=thirdparty%2Fgcc.git

re PR go/47515 (Issues porting libgo to IRIX 6.5)

	PR go/47515
runtime: If no MAP_ANON, use /dev/zero.

From-SVN: r169388
---

diff --git a/libgo/runtime/mem.c b/libgo/runtime/mem.c
index 29cf49542716..4d6c7420907f 100644
--- a/libgo/runtime/mem.c
+++ b/libgo/runtime/mem.c
@@ -3,13 +3,39 @@
 #include "runtime.h"
 #include "malloc.h"
 
+#ifndef MAP_ANON
+#ifdef MAP_ANONYMOUS
+#define MAP_ANON MAP_ANONYMOUS
+#else
+#define USE_DEV_ZERO
+#define MAP_ANON 0
+#endif
+#endif
+
+#ifdef USE_DEV_ZERO
+static int dev_zero = -1;
+#endif
+
 void*
 runtime_SysAlloc(uintptr n)
 {
 	void *p;
+	int fd = -1;
 
 	mstats.sys += n;
-	p = runtime_mmap(nil, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE, -1, 0);
+
+#ifdef USE_DEV_ZERO
+	if (dev_zero == -1) {
+		dev_zero = open("/dev/zero", O_RDONLY);
+		if (dev_zero < 0) {
+			printf("open /dev/zero: errno=%d\n", errno);
+			exit(2);
+		}
+	}
+	fd = dev_zero;
+#endif
+
+	p = runtime_mmap(nil, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE, fd, 0);
 	if (p == MAP_FAILED) {
 		if(errno == EACCES) {
 			printf("mmap: access denied\n");
diff --git a/libgo/runtime/runtime.h b/libgo/runtime/runtime.h
index e43177fef59a..95216e4a5ca2 100644
--- a/libgo/runtime/runtime.h
+++ b/libgo/runtime/runtime.h
@@ -12,6 +12,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 #include <pthread.h>
 #include <semaphore.h>