vperror implementation

This allows us to provide much more useful error messages for
syscalls.

1 files changed, 16 insertions, 1 deletions

diff --git a/util.c b/util.c
index 307f7f0..083bff4 100644
--- a/util.c
+++ b/util.c
@@ -1,9 +1,10 @@
-#include <stdlib.h>
+#include <stdio.h>
 #include <assert.h>
 #include <ctype.h>
 #include <errno.h>
 #include <string.h>
 #include <stdlib.h>
+#include <stdarg.h>
 
 #include "memcached.h"
 
@@ -88,3 +89,17 @@ bool safe_strtol(const char *str, int32_t *out) {
     }
     return false;
 }
+
+void vperror(const char *fmt, ...) {
+    int old_errno = errno;
+    char buf[80];
+    va_list ap;
+
+    va_start(ap, fmt);
+    vsnprintf(buf, sizeof(buf), fmt, ap);
+    va_end(ap);
+
+    errno = old_errno;
+
+    perror(buf);
+}