1 files changed, 34 insertions, 0 deletions
diff --git a/src/util/syserror.cpp b/src/util/syserror.cpp
new file mode 100644
index 0000000000..391ddd3560
--- /dev/null
+++ b/src/util/syserror.cpp
@@ -0,0 +1,34 @@
+// Copyright (c) 2020-2022 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#if defined(HAVE_CONFIG_H)
+#include <config/bitcoin-config.h>
+#endif
+
+#include <tinyformat.h>
+#include <util/syserror.h>
+
+#include <cstring>
+
+std::string SysErrorString(int err)
+{
+    char buf[1024];
+    /* Too bad there are three incompatible implementations of the
+     * thread-safe strerror. */
+    const char *s = nullptr;
+#ifdef WIN32
+    if (strerror_s(buf, sizeof(buf), err) == 0) s = buf;
+#else
+#ifdef STRERROR_R_CHAR_P /* GNU variant can return a pointer outside the passed buffer */
+    s = strerror_r(err, buf, sizeof(buf));
+#else /* POSIX variant always returns message in buffer */
+    if (strerror_r(err, buf, sizeof(buf)) == 0) s = buf;
+#endif
+#endif
+    if (s != nullptr) {
+        return strprintf("%s (%d)", s, err);
+    } else {
+        return strprintf("Unknown error (%d)", err);
+    }
+}