Add definition of error codes

CMakeLists.txt

@@ -109,6 +109,7 @@ set(NEURON_BASE_SOURCES
     src/base/neu_tag_group_config.c
     src/base/neu_plugin_common.c
     src/base/neu_data_expr.c
+    src/base/neu_errcodes.c
     src/connection/tcp_client.c
     src/utils/atomic_data.c
     src/utils/mem_alloc.c

include/neu_errcodes.h

@@ -24,12 +24,43 @@
 extern "C" {
 #endif
 
-#define NEU_ERRORCODE_NONE 0x00000000
-#define NEU_ERRORCODE_OUTOFMEMORY 0xA0000000
-
 typedef enum {
     NEU_ERR_SUCCESS = 0,
-    NEU_ERR_FAILURE = -1,
+
+    NEU_ERR_EINTR        = -1,
+    NEU_ERR_ENOMEM       = -2,
+    NEU_ERR_EINVAL       = -3,
+    NEU_ERR_EBUSY        = -4,
+    NEU_ERR_ETIMEDOUT    = -5,
+    NEU_ERR_ECONNREFUSED = -6,
+    NEU_ERR_ECLOSED      = -7,
+    NEU_ERR_EAGAIN       = -8,
+    NEU_ERR_ENOTSUP      = -9,
+    NEU_ERR_EADDRINUSE   = -10,
+    NEU_ERR_ESTATE       = -11,
+    NEU_ERR_ENOENT       = -12,
+    NEU_ERR_EPROTO       = -13,
+    NEU_ERR_EUNREACHABLE = -14,
+    NEU_ERR_EADDRINVAL   = -15,
+    NEU_ERR_EPERM        = -16,
+    NEU_ERR_EMSGSIZE     = -17,
+    NEU_ERR_ECONNABORTED = -18,
+    NEU_ERR_ECONNRESET   = -19,
+    NEU_ERR_ECANCELED    = -20,
+    NEU_ERR_ENOFILES     = -21,
+    NEU_ERR_ENOSPC       = -22,
+    NEU_ERR_EEXIST       = -23,
+    NEU_ERR_EREADONLY    = -24,
+    NEU_ERR_EWRITEONLY   = -25,
+    NEU_ERR_ECRYPTO      = -26,
+    NEU_ERR_EPEERAUTH    = -27,
+    NEU_ERR_ENOARG       = -28,
+    NEU_ERR_EAMBIGUOUS   = -29,
+    NEU_ERR_EBADTYPE     = -30,
+    NEU_ERR_ECONNSHUT    = -31,
+
+    NEU_ERR_EINTERNAL = -1000, // A neuron interanl error
+    NEU_ERR_FAILURE   = -1001  // A general error
 } neu_err_code_e;
 
 #ifdef __cplusplus

src/base/neu_errcodes.c

@@ -0,0 +1,79 @@
+/**
+ * NEURON IIoT System for Industry 4.0
+ * Copyright (C) 2020-2021 EMQ Technologies Co., Ltd All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ **/
+
+#include "neu_errcodes.h"
+#include "stdio.h"
+#include "stdlib.h"
+
+static const struct {
+    int         code;
+    const char *msg;
+} neu_errors[] = {
+    // clang-format off
+    { 0, "Successful" },
+    { NEU_ERR_EINTR, "Interrupted" },
+    { NEU_ERR_ENOMEM, "Out of memory" },
+    { NEU_ERR_EINVAL, "Invalid argument" },
+    { NEU_ERR_EBUSY, "Resource busy" },
+    { NEU_ERR_ETIMEDOUT, "Timed out" },
+    { NEU_ERR_ECONNREFUSED, "Connection refused" },
+    { NEU_ERR_ECLOSED, "Object closed" },
+    { NEU_ERR_EAGAIN, "Try again" },
+    { NEU_ERR_ENOTSUP, "Not supported" },
+    { NEU_ERR_EADDRINUSE, "Address in use" },
+    { NEU_ERR_ESTATE, "Incorrect state" },
+    { NEU_ERR_ENOENT, "Entry not found" },
+    { NEU_ERR_EPROTO, "Protocol error" },
+    { NEU_ERR_EUNREACHABLE, "Destination unreachable" },
+    { NEU_ERR_EADDRINVAL, "Address invalid" },
+    { NEU_ERR_EPERM, "Permission denied" },
+    { NEU_ERR_EMSGSIZE, "Message too large" },
+    { NEU_ERR_ECONNRESET, "Connection reset" },
+    { NEU_ERR_ECONNABORTED, "Connection aborted" },
+    { NEU_ERR_ECANCELED, "Operation canceled" },
+    { NEU_ERR_ENOFILES, "Out of files" },
+    { NEU_ERR_ENOSPC, "Out of space" },
+    { NEU_ERR_EEXIST, "Resource already exists" },
+    { NEU_ERR_EREADONLY, "Read only resource" },
+    { NEU_ERR_EWRITEONLY, "Write only resource" },
+    { NEU_ERR_ECRYPTO, "Cryptographic error" },
+    { NEU_ERR_EPEERAUTH, "Peer could not be authenticated" },
+    { NEU_ERR_ENOARG, "Option requires argument" },
+    { NEU_ERR_EAMBIGUOUS, "Ambiguous option" },
+    { NEU_ERR_EBADTYPE, "Incorrect type" },
+    { NEU_ERR_ECONNSHUT, "Connection shutdown" },
+    { NEU_ERR_EINTERNAL, "Internal error detected" },
+    { 0, NULL },
+    // clang-format on
+};
+
+// Misc.
+const char *neu_strerror(int num)
+{
+    static char unknownerrbuf[32];
+    for (int i = 0; neu_errors[i].msg != NULL; i++) {
+        if (neu_errors[i].code == num) {
+            return (neu_errors[i].msg);
+        }
+    }
+
+    (void) snprintf(unknownerrbuf, sizeof(unknownerrbuf), "Unknown error #%d",
+                    num);
+    return (unknownerrbuf);
+}