log unixsock errors instead of printing them

These errors got concatenated in front of the image, which resulted in an
invalid image.

1 files changed, 6 insertions, 6 deletions

diff --git a/inc/collectd.inc.php b/inc/collectd.inc.php
index 18f56c8..e5a7df4 100644
--- a/inc/collectd.inc.php
+++ b/inc/collectd.inc.php
@@ -204,15 +204,15 @@ function collectd_flush($identifier) {
 
                 $r = fwrite($socket, $cmd, strlen($cmd));
                 if ($r === false || $r != strlen($cmd)) {
-                        printf('ERROR: Failed to write full command to unix-socket: %d out of %d written',
-                                $r === false ? -1 : $r, strlen($cmd));
+                        error_log(sprintf('ERROR: Failed to write full command to unix-socket: %d out of %d written',
+                                $r === false ? -1 : $r, strlen($cmd)));
                         return FALSE;
                 }
 
                 $resp = fgets($socket);
                 if ($resp === false) {
-                        printf('ERROR: Failed to read response from collectd for command: %s',
-                                trim($cmd));
+                        error_log(sprintf('ERROR: Failed to read response from collectd for command: %s',
+                                trim($cmd)));
                         return FALSE;
                 }
 
@@ -224,8 +224,8 @@ function collectd_flush($identifier) {
 
                 return TRUE;
         } else {
-                printf('ERROR: Failed to open unix-socket to collectd: %d: %s',
-                        $u_errno, $u_errmsg);
+                error_log(sprintf('ERROR: Failed to open unix-socket to collectd: %d: %s',
+                        $u_errno, $u_errmsg));
                 return FALSE;
         }
 }