1 files changed, 133 insertions, 0 deletions
diff --git a/lib/isc/errno2result.c b/lib/isc/errno2result.c
new file mode 100644
index 0000000..1ef0c88
--- /dev/null
+++ b/lib/isc/errno2result.c
@@ -0,0 +1,133 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#include "errno2result.h"
+#include <stdbool.h>
+
+#include <isc/result.h>
+#include <isc/strerr.h>
+#include <isc/string.h>
+#include <isc/util.h>
+
+/*%
+ * Convert a POSIX errno value into an isc_result_t.  The
+ * list of supported errno values is not complete; new users
+ * of this function should add any expected errors that are
+ * not already there.
+ */
+isc_result_t
+isc___errno2result(int posixerrno, bool dolog, const char *file,
+		   unsigned int line) {
+	char strbuf[ISC_STRERRORSIZE];
+
+	switch (posixerrno) {
+	case ENOTDIR:
+	case ELOOP:
+	case EINVAL: /* XXX sometimes this is not for files */
+	case ENAMETOOLONG:
+	case EBADF:
+		return (ISC_R_INVALIDFILE);
+	case EISDIR:
+		return (ISC_R_NOTFILE);
+	case ENOENT:
+		return (ISC_R_FILENOTFOUND);
+	case EACCES:
+	case EPERM:
+	case EROFS:
+		return (ISC_R_NOPERM);
+	case EEXIST:
+		return (ISC_R_FILEEXISTS);
+	case EIO:
+		return (ISC_R_IOERROR);
+	case ENOMEM:
+		return (ISC_R_NOMEMORY);
+	case ENFILE:
+	case EMFILE:
+		return (ISC_R_TOOMANYOPENFILES);
+#ifdef EDQUOT
+	case EDQUOT:
+		return (ISC_R_DISCQUOTA);
+#endif /* ifdef EDQUOT */
+	case ENOSPC:
+		return (ISC_R_DISCFULL);
+#ifdef EOVERFLOW
+	case EOVERFLOW:
+		return (ISC_R_RANGE);
+#endif /* ifdef EOVERFLOW */
+	case EPIPE:
+#ifdef ECONNRESET
+	case ECONNRESET:
+#endif /* ifdef ECONNRESET */
+#ifdef ECONNABORTED
+	case ECONNABORTED:
+#endif /* ifdef ECONNABORTED */
+		return (ISC_R_CONNECTIONRESET);
+#ifdef ENOTCONN
+	case ENOTCONN:
+		return (ISC_R_NOTCONNECTED);
+#endif /* ifdef ENOTCONN */
+#ifdef ETIMEDOUT
+	case ETIMEDOUT:
+		return (ISC_R_TIMEDOUT);
+#endif /* ifdef ETIMEDOUT */
+#ifdef ENOBUFS
+	case ENOBUFS:
+		return (ISC_R_NORESOURCES);
+#endif /* ifdef ENOBUFS */
+#ifdef EAFNOSUPPORT
+	case EAFNOSUPPORT:
+		return (ISC_R_FAMILYNOSUPPORT);
+#endif /* ifdef EAFNOSUPPORT */
+#ifdef ENETDOWN
+	case ENETDOWN:
+		return (ISC_R_NETDOWN);
+#endif /* ifdef ENETDOWN */
+#ifdef EHOSTDOWN
+	case EHOSTDOWN:
+		return (ISC_R_HOSTDOWN);
+#endif /* ifdef EHOSTDOWN */
+#ifdef ENETUNREACH
+	case ENETUNREACH:
+		return (ISC_R_NETUNREACH);
+#endif /* ifdef ENETUNREACH */
+#ifdef EHOSTUNREACH
+	case EHOSTUNREACH:
+		return (ISC_R_HOSTUNREACH);
+#endif /* ifdef EHOSTUNREACH */
+#ifdef EADDRINUSE
+	case EADDRINUSE:
+		return (ISC_R_ADDRINUSE);
+#endif /* ifdef EADDRINUSE */
+	case EADDRNOTAVAIL:
+		return (ISC_R_ADDRNOTAVAIL);
+	case ECONNREFUSED:
+		return (ISC_R_CONNREFUSED);
+	default:
+		if (dolog) {
+			strerror_r(posixerrno, strbuf, sizeof(strbuf));
+			UNEXPECTED_ERROR(file, line,
+					 "unable to convert errno "
+					 "to isc_result: %d: %s",
+					 posixerrno, strbuf);
+		}
+		/*
+		 * XXXDCL would be nice if perhaps this function could
+		 * return the system's error string, so the caller
+		 * might have something more descriptive than "unexpected
+		 * error" to log with.
+		 */
+		return (ISC_R_UNEXPECTED);
+	}
+}