libgo: Support systems which do not have strerror_r.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@171757 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 32 insertions, 0 deletions

diff --git a/libgo/syscalls/errstr_nor.go b/libgo/syscalls/errstr_nor.go
new file mode 100644
index 00000000000..358b3ee9cf6
--- /dev/null
+++ b/libgo/syscalls/errstr_nor.go
@@ -0,0 +1,32 @@
+// errstr.go -- Error strings when there is no strerror_r.
+
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package syscall
+
+import (
+	"sync"
+	"unsafe"
+)
+
+func libc_strerror(int) *byte __asm__ ("strerror")
+
+var errstr_lock sync.Mutex
+
+func Errstr(errno int) string {
+	errstr_lock.Lock()
+
+	bp := libc_strerror(errno)
+	b := (*[1000]byte)(unsafe.Pointer(bp))
+	i := 0
+	for b[i] != 0 {
+		i++
+	}
+	s := string(b[:i])
+
+	errstr_lock.Unlock()
+
+	return s
+}