diff --git a/aqvm/base/file/file.c b/aqvm/base/file/file.c
index 8213508..090604c 100644
--- a/aqvm/base/file/file.c
+++ b/aqvm/base/file/file.c
@@ -10,13 +10,13 @@
 
 #include "aqvm/base/threading/mutex/mutex.h"
 
-int AqvmBaseFile_LockFile(struct AqvmBaseFile_File* file) {
-  if (file == NULL) {
+int AqvmBaseFile_LockFile(struct AqvmBaseFile_File* stream) {
+  if (AqvmBaseFile_CheckStream(stream)) {
     // TODO
     return -1;
   }
 
-  int result = AqvmBaseThreadingMutex_LockMutex(&file->mutex);
+  int result = AqvmBaseThreadingMutex_LockMutex(&stream->mutex);
   if (result != 0) {
     // TODO
     return -2;
@@ -24,13 +24,13 @@ int AqvmBaseFile_LockFile(struct AqvmBaseFile_File* file) {
   return 0;
 }
 
-int AqvmBaseFile_UnlockFile(struct AqvmBaseFile_File* file) {
-  if (file == NULL) {
+int AqvmBaseFile_UnlockFile(struct AqvmBaseFile_File* stream) {
+  if (AqvmBaseFile_CheckStream(stream)) {
     // TODO
     return -1;
   }
 
-  int result = AqvmBaseThreadingMutex_UnlockMutex(&file->mutex);
+  int result = AqvmBaseThreadingMutex_UnlockMutex(&stream->mutex);
   if (result != 0) {
     // TODO
     return -2;
@@ -38,8 +38,25 @@ int AqvmBaseFile_UnlockFile(struct AqvmBaseFile_File* file) {
   return 0;
 }
 
+int AqvmBaseFile_CheckStream(struct AqvmBaseFile_File* stream) {
+  if (stream == NULL) {
+    // TODO
+    return -1;
+  }
+  if (stream->file == NULL) {
+    // TODO
+    return -2;
+  }
+  if (AqvmBaseFile_ferror(stream) != 0) {
+    // TODO
+    return -3;
+  }
+
+  return 0;
+}
+
 void AqvmBaseFile_clearerr(struct AqvmBaseFile_File* stream) {
-  if (stream == NULL || stream->file == NULL || AqvmBaseFile_ferror(stream) != 0) {
+  if (AqvmBaseFile_CheckStream(stream)) {
     // TODO
     return;
   }
@@ -48,7 +65,7 @@ void AqvmBaseFile_clearerr(struct AqvmBaseFile_File* stream) {
 }
 
 int AqvmBaseFile_fclose(struct AqvmBaseFile_File* stream) {
-  if (stream == NULL || stream->file == NULL || AqvmBaseFile_ferror(stream) != 0) {
+  if (AqvmBaseFile_CheckStream(stream)) {
     // TODO
     return -1;
   }
@@ -70,7 +87,7 @@ int AqvmBaseFile_fclose(struct AqvmBaseFile_File* stream) {
 }
 
 int AqvmBaseFile_feof(struct AqvmBaseFile_File* stream) {
-  if (stream == NULL || AqvmBaseFile_ferror(stream) != 0) {
+  if (AqvmBaseFile_CheckStream(stream)) {
     // TODO
     return -1;
   }
@@ -80,7 +97,7 @@ int AqvmBaseFile_feof(struct AqvmBaseFile_File* stream) {
 }
 
 int AqvmBaseFile_ferror(struct AqvmBaseFile_File* stream) {
-  if (stream == NULL || stream->file == NULL || ferror(stream->file)) {
+  if (stream == NULL || stream->file == NULL) {
     // TODO
     return -1;
   }
@@ -90,7 +107,7 @@ int AqvmBaseFile_ferror(struct AqvmBaseFile_File* stream) {
 }
 
 int AqvmBaseFile_fflush(struct AqvmBaseFile_File* stream) {
-  if (stream == NULL || stream->file == NULL || AqvmBaseFile_ferror(stream) != 0) {
+  if (AqvmBaseFile_CheckStream(stream)) {
     // TODO
     return -1;
   }
@@ -116,8 +133,7 @@ int AqvmBaseFile_fflush(struct AqvmBaseFile_File* stream) {
 }
 
 int AqvmBaseFile_fgetpos(struct AqvmBaseFile_File* stream, fpos_t* pos) {
-  if (stream == NULL || stream->file == NULL || AqvmBaseFile_ferror(stream) != 0 ||
-      pos == NULL) {
+  if (AqvmBaseFile_CheckStream(stream) || pos == NULL) {
     // TODO
     return -1;
   }
@@ -173,8 +189,7 @@ struct AqvmBaseFile_File* AqvmBaseFile_fopen(const char* filename,
 
 size_t AqvmBaseFile_fread(void* ptr, size_t size, size_t nmemb,
                           struct AqvmBaseFile_File* stream) {
-  if (ptr == NULL || stream == NULL || stream->file == NULL ||
-      AqvmBaseFile_ferror(stream) != 0) {
+  if (ptr == NULL || AqvmBaseFile_CheckStream(stream)) {
     // TODO
     return 0;
   }
@@ -196,8 +211,7 @@ size_t AqvmBaseFile_fread(void* ptr, size_t size, size_t nmemb,
 
 struct AqvmBaseFile_File* AqvmBaseFile_freopen(
     const char* filename, const char* mode, struct AqvmBaseFile_File* stream) {
-  if (filename == NULL || mode == NULL || stream == NULL ||
-      stream->file == NULL || AqvmBaseFile_ferror(stream) != 0) {
+  if (filename == NULL || mode == NULL || AqvmBaseFile_CheckStream(stream)) {
     // TODO
     return NULL;
   }
@@ -229,7 +243,7 @@ struct AqvmBaseFile_File* AqvmBaseFile_freopen(
 
 int AqvmBaseFile_fseek(struct AqvmBaseFile_File* stream, long int offset,
                        int whence) {
-  if (stream == NULL || stream->file == NULL || AqvmBaseFile_ferror(stream) != 0) {
+  if (AqvmBaseFile_CheckStream(stream)) {
     // TODO
     return -1;
   }
@@ -255,8 +269,7 @@ int AqvmBaseFile_fseek(struct AqvmBaseFile_File* stream, long int offset,
 }
 
 int AqvmBaseFile_fsetpos(struct AqvmBaseFile_File* stream, const fpos_t* pos) {
-  if (stream == NULL || stream->file == NULL || AqvmBaseFile_ferror(stream) != 0 ||
-      pos == NULL) {
+  if (AqvmBaseFile_CheckStream(stream) || pos == NULL) {
     // TODO
     return -1;
   }
@@ -282,7 +295,7 @@ int AqvmBaseFile_fsetpos(struct AqvmBaseFile_File* stream, const fpos_t* pos) {
 }
 
 long int AqvmBaseFile_ftell(struct AqvmBaseFile_File* stream) {
-  if (stream == NULL || stream->file == NULL || AqvmBaseFile_ferror(stream) != 0) {
+  if (AqvmBaseFile_CheckStream(stream)) {
     // TODO
     return -1L;
   }
@@ -309,8 +322,7 @@ long int AqvmBaseFile_ftell(struct AqvmBaseFile_File* stream) {
 
 size_t AqvmBaseFile_fwrite(const void* ptr, size_t size, size_t nmemb,
                            struct AqvmBaseFile_File* stream) {
-  if (ptr == NULL || stream == NULL || stream->file == NULL ||
-      AqvmBaseFile_ferror(stream) != 0) {
+  if (ptr == NULL || AqvmBaseFile_CheckStream(stream)) {
     // TODO
     return 0;
   }
@@ -359,7 +371,7 @@ int AqvmBaseFile_rename(const char* old_filename, const char* new_filename) {
 }
 
 void AqvmBaseFile_rewind(struct AqvmBaseFile_File* stream) {
-  if (stream == NULL || stream->file == NULL || AqvmBaseFile_ferror(stream) != 0) {
+  if (AqvmBaseFile_CheckStream(stream)) {
     // TODO
     return;
   }
@@ -377,7 +389,7 @@ void AqvmBaseFile_rewind(struct AqvmBaseFile_File* stream) {
 }
 
 void AqvmBaseFile_setbuf(struct AqvmBaseFile_File* stream, char* buffer) {
-  if (stream == NULL || stream->file == NULL || AqvmBaseFile_ferror(stream) != 0) {
+  if (AqvmBaseFile_CheckStream(stream)) {
     // TODO
     return;
   }
@@ -396,7 +408,7 @@ void AqvmBaseFile_setbuf(struct AqvmBaseFile_File* stream, char* buffer) {
 
 int AqvmBaseFile_setvbuf(struct AqvmBaseFile_File* stream, char* buffer,
                          int mode, size_t size) {
-  if (stream == NULL || stream->file == NULL || AqvmBaseFile_ferror(stream) != 0) {
+  if (AqvmBaseFile_CheckStream(stream)) {
     // TODO
     return -1;
   }
diff --git a/aqvm/base/file/file.h b/aqvm/base/file/file.h
index c268e3e..b84b4d9 100644
--- a/aqvm/base/file/file.h
+++ b/aqvm/base/file/file.h
@@ -15,9 +15,11 @@ struct AqvmBaseFile_File {
   AqvmBaseThreadingMutex_Mutex mutex;
 };
 
-int AqvmBaseFile_LockFile(struct AqvmBaseFile_File* file);
+int AqvmBaseFile_LockFile(struct AqvmBaseFile_File* stream);
 
-int AqvmBaseFile_UnlockFile(struct AqvmBaseFile_File* file);
+int AqvmBaseFile_UnlockFile(struct AqvmBaseFile_File* stream);
+
+int AqvmBaseFile_CheckStream(struct AqvmBaseFile_File* stream);
 
 void AqvmBaseFile_clearerr(struct AqvmBaseFile_File* stream);
 
diff --git a/aqvm/base/io/io.c b/aqvm/base/io/io.c
index 7b15303..2208768 100644
--- a/aqvm/base/io/io.c
+++ b/aqvm/base/io/io.c
@@ -44,8 +44,7 @@ int AqvmBaseIo_CloseIo() {
 }
 
 int AqvmBaseIo_LockStream(struct AqvmBaseFile_File* stream) {
-  if (stream == NULL || stream->file == NULL ||
-      AqvmBaseFile_ferror(stream) != 0) {
+  if (AqvmBaseFile_CheckStream(stream) != 0) {
     // TODO
     return -1;
   }
@@ -65,11 +64,12 @@ int AqvmBaseIo_LockStream(struct AqvmBaseFile_File* stream) {
       return -4;
     }
   }
+
+  return 0;
 }
 
 int AqvmBaseIo_UnlockStream(struct AqvmBaseFile_File* stream) {
-  if (stream == NULL || stream->file == NULL ||
-      AqvmBaseFile_ferror(stream) != 0) {
+  if (AqvmBaseFile_CheckStream(stream) != 0) {
     // TODO
     return -1;
   }
@@ -89,11 +89,16 @@ int AqvmBaseIo_UnlockStream(struct AqvmBaseFile_File* stream) {
       return -4;
     }
   }
+
+  return 0;
 }
 
-int AqvmBaseIo_OutputLog(struct AqvmBaseFile_File* stream, ...) {
-  if (stream == NULL || stream->file == NULL ||
-      AqvmBaseFile_ferror(stream) != 0) {
+int AqvmBaseIo_OutputLog(struct AqvmBaseFile_File* stream, const char* time,
+                         const char* type, const char* code,
+                         const char* message, va_list system_info,
+                         va_list other_info) {
+  if (AqvmBaseFile_CheckStream(stream) != 0 || time == NULL || type == NULL ||
+      code == NULL || message == NULL) {
     // TODO
     return -1;
   }
@@ -103,30 +108,51 @@ int AqvmBaseIo_OutputLog(struct AqvmBaseFile_File* stream, ...) {
     return -2;
   }
 
-  va_list arg;
-  va_start(arg, stream);
-  char* str = va_arg(arg, char*);
-  while (str != NULL) {
-    int result = fprintf(stream->file, "%s", str);
-    if (result < 0) {
+  if (fprintf(
+          stream->file,
+          "{\"Time\":\"%s\",\"Type\":\"%s\",\"Code\":\"%s\",\"Message\":\"%s\"",
+          time, type, code, message) < 0) {
+    // TODO
+    return -3;
+  }
+
+  char* name = va_arg(system_info, char*);
+  char* value = va_arg(system_info, char*);
+  while (name != NULL && value != NULL) {
+    if (fprintf(stream->file, ",\"%s\":\"%s\"", name, value) < 0) {
       // TODO
-      return -3;
+      return -4;
     }
-    str = va_arg(arg, char*);
+    name = va_arg(system_info, char*);
+    value = va_arg(system_info, char*);
+  }
+
+  name = va_arg(other_info, char*);
+  value = va_arg(other_info, char*);
+  while (name != NULL && value != NULL) {
+    if (fprintf(stream->file, ",\"%s\":\"%s\"", name, value) < 0) {
+      // TODO
+      return -5;
+    }
+    name = va_arg(other_info, char*);
+    value = va_arg(other_info, char*);
+  }
+
+  if (fprintf(stream->file, "}\n") < 0) {
+    // TODO
+    return -6;
   }
-  va_end(arg);
 
   if (AqvmBaseIo_UnlockStream(stream) != 0) {
     // TODO
-    return -4;
+    return -7;
   }
 
   return 0;
 }
 
 int AqvmBaseIo_fgetc(struct AqvmBaseFile_File* stream) {
-  if (stream == NULL || stream->file == NULL ||
-      AqvmBaseFile_ferror(stream) != 0) {
+  if (AqvmBaseFile_CheckStream(stream) != 0) {
     // TODO
     return -2;
   }
@@ -159,8 +185,7 @@ int AqvmBaseIo_fgetc(struct AqvmBaseFile_File* stream) {
 }
 
 char* AqvmBaseIo_fgets(char* str, int n, struct AqvmBaseFile_File* stream) {
-  if (stream == NULL || stream->file == NULL ||
-      AqvmBaseFile_ferror(stream) != 0 || str == NULL || n <= 0) {
+  if (str == NULL || n <= 0 || AqvmBaseFile_CheckStream(stream) != 0) {
     // TODO
     return NULL;
   }
@@ -194,8 +219,7 @@ char* AqvmBaseIo_fgets(char* str, int n, struct AqvmBaseFile_File* stream) {
 
 int AqvmBaseIo_fprintf(struct AqvmBaseFile_File* stream, const char* format,
                        ...) {
-  if (stream == NULL || stream->file == NULL ||
-      AqvmBaseFile_ferror(stream) != 0 || format == NULL) {
+  if (format == NULL || AqvmBaseFile_CheckStream(stream) != 0) {
     // TODO
     return -1;
   }
@@ -228,8 +252,7 @@ int AqvmBaseIo_fprintf(struct AqvmBaseFile_File* stream, const char* format,
 }
 
 int AqvmBaseIo_fputc(int character, struct AqvmBaseFile_File* stream) {
-  if (stream == NULL || stream->file == NULL ||
-      AqvmBaseFile_ferror(stream) != 0) {
+  if (AqvmBaseFile_CheckStream(stream) != 0) {
     // TODO
     return -2;
   }
@@ -259,8 +282,7 @@ int AqvmBaseIo_fputc(int character, struct AqvmBaseFile_File* stream) {
 }
 
 int AqvmBaseIo_fputs(const char* str, struct AqvmBaseFile_File* stream) {
-  if (str == NULL || stream == NULL || stream->file == NULL ||
-      AqvmBaseFile_ferror(stream) != 0) {
+  if (str == NULL || AqvmBaseFile_CheckStream(stream) != 0) {
     // TODO
     return -1;
   }
@@ -291,8 +313,7 @@ int AqvmBaseIo_fputs(const char* str, struct AqvmBaseFile_File* stream) {
 
 int AqvmBaseIo_fscanf(struct AqvmBaseFile_File* stream, const char* format,
                       ...) {
-  if (stream == NULL || stream->file == NULL ||
-      AqvmBaseFile_ferror(stream) != 0 || format == NULL) {
+  if (format == NULL || AqvmBaseFile_CheckStream(stream) != 0) {
     // TODO
     return -2;
   }
@@ -325,8 +346,7 @@ int AqvmBaseIo_fscanf(struct AqvmBaseFile_File* stream, const char* format,
 }
 
 int AqvmBaseIo_getc(struct AqvmBaseFile_File* stream) {
-  if (stream == NULL || stream->file == NULL ||
-      AqvmBaseFile_ferror(stream) != 0) {
+  if (AqvmBaseFile_CheckStream(stream) != 0) {
     return -2;
   }
   if (stream->file == stdout || stream->file == stderr) {
@@ -359,7 +379,7 @@ int AqvmBaseIo_getc(struct AqvmBaseFile_File* stream) {
 }
 
 int AqvmBaseIo_getchar(void) {
-  if (AqvmBaseFile_ferror(AqvmBaseIo_stdin) != 0) {
+  if (AqvmBaseFile_CheckStream(AqvmBaseIo_stdin) != 0) {
     // TODO
     return -2;
   }
@@ -389,7 +409,7 @@ int AqvmBaseIo_getchar(void) {
 }
 
 int AqvmBaseIo_perror(const char* str) {
-  if (str == NULL || AqvmBaseFile_ferror(AqvmBaseIo_stdout) != 0) {
+  if (str == NULL || AqvmBaseFile_CheckStream(AqvmBaseIo_stderr) != 0) {
     return -1;
   }
 
@@ -409,7 +429,7 @@ int AqvmBaseIo_perror(const char* str) {
 }
 
 int AqvmBaseIo_printf(const char* format, ...) {
-  if (format == NULL || AqvmBaseFile_ferror(AqvmBaseIo_stdout) != 0) {
+  if (format == NULL || AqvmBaseFile_CheckStream(AqvmBaseIo_stdout) != 0) {
     return -1;
   }
 
@@ -437,8 +457,7 @@ int AqvmBaseIo_printf(const char* format, ...) {
 }
 
 int AqvmBaseIo_putc(int character, struct AqvmBaseFile_File* stream) {
-  if (stream == NULL || stream->file == NULL ||
-      AqvmBaseFile_ferror(stream) != 0) {
+  if (AqvmBaseFile_CheckStream(stream) != 0) {
     // TODO
     return -1;
   }
@@ -468,7 +487,7 @@ int AqvmBaseIo_putc(int character, struct AqvmBaseFile_File* stream) {
 }
 
 int AqvmBaseIo_putchar(int character) {
-  if (AqvmBaseFile_ferror(AqvmBaseIo_stdout) != 0) {
+  if (AqvmBaseFile_CheckStream(AqvmBaseIo_stdout) != 0) {
     // TODO
     return -2;
   }
@@ -494,7 +513,7 @@ int AqvmBaseIo_putchar(int character) {
 }
 
 int AqvmBaseIo_puts(const char* str) {
-  if (str == NULL || AqvmBaseFile_ferror(AqvmBaseIo_stdout) != 0) {
+  if (str == NULL || AqvmBaseFile_CheckStream(AqvmBaseIo_stdout) != 0) {
     // TODO
     return -1;
   }
@@ -520,7 +539,7 @@ int AqvmBaseIo_puts(const char* str) {
 }
 
 int AqvmBaseIo_scanf(const char* format, ...) {
-  if (format == NULL || AqvmBaseFile_ferror(AqvmBaseIo_stdin) != 0) {
+  if (format == NULL || AqvmBaseFile_CheckStream(AqvmBaseIo_stdin) != 0) {
     // TODO
     return -1;
   }
@@ -550,7 +569,7 @@ int AqvmBaseIo_scanf(const char* format, ...) {
 
 int AqvmBaseIo_snprintf(char* str, size_t size, const char* format, ...) {
   if (str == NULL || format == NULL ||
-      AqvmBaseFile_ferror(AqvmBaseIo_stdout) != 0) {
+      AqvmBaseFile_CheckStream(AqvmBaseIo_stdout) != 0) {
     // TODO
     return -1;
   }
@@ -580,7 +599,7 @@ int AqvmBaseIo_snprintf(char* str, size_t size, const char* format, ...) {
 
 int AqvmBaseIo_sprintf(char* str, const char* format, ...) {
   if (str == NULL || format == NULL ||
-      AqvmBaseFile_ferror(AqvmBaseIo_stdout) != 0) {
+      AqvmBaseFile_CheckStream(AqvmBaseIo_stdout) != 0) {
     // TODO
     return -1;
   }
@@ -610,7 +629,7 @@ int AqvmBaseIo_sprintf(char* str, const char* format, ...) {
 
 int AqvmBaseIo_sscanf(const char* str, const char* format, ...) {
   if (str == NULL || format == NULL ||
-      AqvmBaseFile_ferror(AqvmBaseIo_stdout) != 0) {
+      AqvmBaseFile_CheckStream(AqvmBaseIo_stdout) != 0) {
     // TODO
     return -1;
   }
@@ -639,27 +658,30 @@ int AqvmBaseIo_sscanf(const char* str, const char* format, ...) {
 }
 
 int AqvmBaseIo_ungetc(int character, struct AqvmBaseFile_File* stream) {
-  if (stream == NULL || stream->file == NULL ||
-      AqvmBaseFile_ferror(stream) != 0) {
+  if (AqvmBaseFile_CheckStream(stream) != 0) {
     // TODO
     return -1;
   }
+  if (stream->file == stdout || stream->file == stderr) {
+    // TODO
+    return -2;
+  }
 
   if (AqvmBaseIo_LockStream(AqvmBaseIo_stdout) != 0) {
     // TODO
-    return -2;
+    return -3;
   }
 
   int result = ungetc(character, stream->file);
 
   if (AqvmBaseIo_UnlockStream(AqvmBaseIo_stdout) != 0) {
     // TODO
-    return -3;
+    return -4;
   }
 
   if (result == EOF) {
     // TODO
-    return -4;
+    return -5;
   }
 
   return result;
@@ -667,8 +689,7 @@ int AqvmBaseIo_ungetc(int character, struct AqvmBaseFile_File* stream) {
 
 int AqvmBaseIo_vfprintf(struct AqvmBaseFile_File* stream, const char* format,
                         va_list arg) {
-  if (stream == NULL || stream->file == NULL ||
-      AqvmBaseFile_ferror(stream) != 0 || format == NULL) {
+  if (format == NULL || AqvmBaseFile_CheckStream(stream) != 0) {
     // TODO
     return -1;
   }
@@ -698,7 +719,7 @@ int AqvmBaseIo_vfprintf(struct AqvmBaseFile_File* stream, const char* format,
 }
 
 int AqvmBaseIo_vprintf(const char* format, va_list arg) {
-  if (format == NULL || AqvmBaseFile_ferror(AqvmBaseIo_stdout) != 0) {
+  if (format == NULL || AqvmBaseFile_CheckStream(AqvmBaseIo_stdout) != 0) {
     return -1;
   }
 
@@ -724,7 +745,7 @@ int AqvmBaseIo_vprintf(const char* format, va_list arg) {
 
 int AqvmBaseIo_vsprintf(char* str, const char* format, va_list arg) {
   if (str == NULL || format == NULL ||
-      AqvmBaseFile_ferror(AqvmBaseIo_stdout) != 0) {
+      AqvmBaseFile_CheckStream(AqvmBaseIo_stdout) != 0) {
     // TODO
     return -1;
   }
diff --git a/aqvm/base/io/io.h b/aqvm/base/io/io.h
index 5ae5a00..0ae7cdf 100644
--- a/aqvm/base/io/io.h
+++ b/aqvm/base/io/io.h
@@ -23,7 +23,10 @@ int AqvmBaseIo_LockStream(struct AqvmBaseFile_File* stream);
 
 int AqvmBaseIo_UnlockStream(struct AqvmBaseFile_File* stream);
 
-int AqvmBaseIo_OutputToStream(struct AqvmBaseFile_File* stream, ...);
+int AqvmBaseIo_OutputLog(struct AqvmBaseFile_File* stream, const char* time,
+                         const char* type, const char* code,
+                         const char* message, va_list system_info,
+                         va_list other_info);
 
 int AqvmBaseIo_fgetc(struct AqvmBaseFile_File* stream);
 
diff --git a/aqvm/base/logging/logging.c b/aqvm/base/logging/logging.c
index 66df627..ee8c5de 100644
--- a/aqvm/base/logging/logging.c
+++ b/aqvm/base/logging/logging.c
@@ -15,31 +15,20 @@
 #include "aqvm/base/io/io.h"
 
 void AqvmBaseLogging_OutputLog(const char* type, const char* code,
-                               const char* message, const char* other_info) {
+                               const char* message, ...) {
   char time_str[28];
   time_t current_time = time(NULL);
   strftime(time_str, 28, "%Y-%m-%dT%H:%M:%S%z", localtime(&current_time));
 
-  const char* format = NULL;
-
-  if (other_info != NULL) {
-    format =
-        "{\"Time\":\"%s\",\"Type\":\"%s\",\"Code\":\"%s\",\"Message\":\"%s\",%"
-        "s}\n";
-  }
-
-  AqvmBaseLogging_ProcessLog(format, time_str, type, code, message, other_info);
+  va_list other_info;
+  va_start(other_info, message);
+  AqvmBaseLogging_ProcessLog(time_str, type, code, message, other_info, "Test","This is a test.",NULL);
+  va_end(other_info);
 }
 
-void AqvmBaseLogging_ProcessLog(const char* format, const char* time,
-                                const char* type, const char* code,
-                                const char* message, const char* other_info,
-                                ...) {
-  if (format == NULL) {
-    format =
-        "{\"Time\":\"%s\",\"Type\":\"%s\",\"Code\":\"%s\",\"Message\":\"%s\"}"
-        "\n";
-  }
+void AqvmBaseLogging_ProcessLog(const char* time, const char* type,
+                                const char* code, const char* message,
+                                va_list other_info, ...) {
   if (time == NULL) {
     time = "NULL";
   }
@@ -53,42 +42,44 @@ void AqvmBaseLogging_ProcessLog(const char* format, const char* time,
     message = "NULL";
   }
 
-  AqvmBaseLogging_OutputLogToConsole(format, time, type, code, message,
-                                     other_info);
-  AqvmBaseLogging_OutputLogToFile(format, time, type, code, message,
-                                  other_info);
+  va_list system_info;
+  va_start(system_info, other_info);
+  AqvmBaseLogging_OutputLogToConsole(time, type, code, message, other_info,
+                                     system_info);
+  AqvmBaseLogging_OutputLogToFile(time, type, code, message, other_info,
+                                  system_info);
+  va_end(system_info);
 }
 
-int AqvmBaseLogging_OutputLogToConsole(const char* format, ...) {
-  va_list args;
-  va_start(args, format);
-
-  int result = AqvmBaseIo_vfprintf(AqvmBaseIo_stderr, format, args);
+int AqvmBaseLogging_OutputLogToConsole(const char* time, const char* type,
+                                       const char* code, const char* message,
+                                       va_list system_info,
+                                       va_list other_info) {
+  int result = AqvmBaseIo_OutputLog(AqvmBaseIo_stderr, time, type, code,
+                                    message, system_info, other_info);
   if (result != 0) {
     // TODO
     return -1;
   }
-
-  va_end(args);
-  return result;
+  return 0;
 }
 
-int AqvmBaseLogging_OutputLogToFile(const char* format, ...) {
+int AqvmBaseLogging_OutputLogToFile(const char* time, const char* type,
+                                    const char* code, const char* message,
+                                    va_list system_info, va_list other_info) {
   struct AqvmBaseFile_File* log_ptr = AqvmBaseFile_fopen(".aqvm_log.log", "a");
   if (log_ptr == NULL) {
     return -1;
   }
 
-  va_list args;
-  va_start(args, format);
-
-  int result = AqvmBaseIo_vfprintf(log_ptr, format, args);
+  int result = AqvmBaseIo_OutputLog(log_ptr, time, type, code, message,
+                                    system_info, other_info);
   if (result != 0) {
     // TODO
     return -2;
   }
 
-  va_end(args);
   AqvmBaseFile_fclose(log_ptr);
-  return result;
+
+  return 0;
 }
\ No newline at end of file
diff --git a/aqvm/base/logging/logging.h b/aqvm/base/logging/logging.h
index 2983465..2cf345c 100644
--- a/aqvm/base/logging/logging.h
+++ b/aqvm/base/logging/logging.h
@@ -5,6 +5,7 @@
 #ifndef AQ_AQVM_BASE_LOGGING_LOGGING_H_
 #define AQ_AQVM_BASE_LOGGING_LOGGING_H_
 
+#include <stdarg.h>
 #include <stdint.h>
 
 // Outputs log with |type|, |code|, |message|, |other_info|, time, errno and so
@@ -22,15 +23,18 @@
 // is json format. For example, AqvmBaseLogging_OutputLog("type",
 // "code", "message", "other_info");
 void AqvmBaseLogging_OutputLog(const char* type, const char* code,
-                               const char* message, const char* other_info);
+                               const char* message, ...);
 
-void AqvmBaseLogging_ProcessLog(const char* format, const char* time,
-                                const char* type, const char* code,
-                                const char* message, 
-                                const char* other_info, ...);
+void AqvmBaseLogging_ProcessLog(const char* time, const char* type,
+                                const char* code, const char* message,
+                                va_list other_info, ...);
 
-int AqvmBaseLogging_OutputLogToConsole(const char* format, ...);
+int AqvmBaseLogging_OutputLogToConsole(const char* time, const char* type,
+                                       const char* code, const char* message,
+                                       va_list system_info, va_list other_info);
 
-int AqvmBaseLogging_OutputLogToFile(const char* format, ...);
+int AqvmBaseLogging_OutputLogToFile(const char* time, const char* type,
+                                    const char* code, const char* message,
+                                    va_list system_info, va_list other_info);
 
 #endif
\ No newline at end of file