diff --git a/log.c b/log.c
index 342f71f..3364e69 100644
--- a/log.c
+++ b/log.c
@@ -2,11 +2,13 @@
 
 #include <stdio.h>
 #include <stdarg.h>
+#include <string.h>
 #include <stdbool.h>
+#include <errno.h>
 
 static void
 _log(enum log_class log_class, const char *module, const char *file, int lineno,
-     const char *fmt, va_list va)
+     const char *fmt, int sys_errno, va_list va)
 {
     bool colorize = true;
 
@@ -35,6 +37,10 @@ _log(enum log_class log_class, const char *module, const char *file, int lineno,
 
     //printf("%%s\n", buf);
     vprintf(fmt, va);
+
+    if (sys_errno != 0)
+        printf(": %s", strerror(sys_errno));
+
     printf("\n");
 }
 
@@ -44,6 +50,16 @@ log_msg(enum log_class log_class, const char *module,
 {
     va_list ap;
     va_start(ap, fmt);
-    _log(log_class, module, file, lineno, fmt, ap);
+    _log(log_class, module, file, lineno, fmt, 0, ap);
+    va_end(ap);
+}
+
+void log_errno(enum log_class log_class, const char *module,
+               const char *file, int lineno,
+               const char *fmt, ...)
+{
+    va_list ap;
+    va_start(ap, fmt);
+    _log(log_class, module, file, lineno, fmt, errno, ap);
     va_end(ap);
 }
diff --git a/log.h b/log.h
index 686b96a..9e6cd95 100644
--- a/log.h
+++ b/log.h
@@ -5,11 +5,15 @@ enum log_class { LOG_CLASS_ERROR, LOG_CLASS_WARNING, LOG_CLASS_INFO, LOG_CLASS_D
 void log_msg(enum log_class log_class, const char *module,
                const char *file, int lineno,
                const char *fmt, ...) __attribute__((format (printf, 5, 6)));
+
+void log_errno(enum log_class log_class, const char *module,
                const char *file, int lineno,
                const char *fmt, ...) __attribute__((format (printf, 5, 6)));
 
 #define LOG_ERR(fmt, ...)  \
     log_msg(LOG_CLASS_ERROR, LOG_MODULE, __FILE__, __LINE__, fmt, ## __VA_ARGS__)
+#define LOG_ERRNO(fmt, ...) \
+    log_errno(LOG_CLASS_ERROR, LOG_MODULE, __FILE__, __LINE__, fmt, ## __VA_ARGS__)
 #define LOG_WARN(fmt, ...)  \
     log_msg(LOG_CLASS_WARNING, LOG_MODULE, __FILE__, __LINE__, fmt, ## __VA_ARGS__)
 #define LOG_INFO(fmt, ...)  \