Drop unused return value of virLogOutputFunc

Nothing uses the return value, and creating it requries otherwise
unnecessary strlen () calls.

This cleanup is conceptually independent from the rest of the series
(although the later patches won't apply without it).  This just seems
a good opportunity to clean this up, instead of entrenching the unnecessary
return value in the virLogOutputFunc instance that will be added in this
series.
Signed-off-by: NMiloslav Trmač <mitr@redhat.com>

src/util/logging.c

@@ -98,12 +98,12 @@ static virLogPriority virLogDefaultPriority = VIR_LOG_DEFAULT;
 
 static int virLogResetFilters(void);
 static int virLogResetOutputs(void);
-static int virLogOutputToFd(const char *category, int priority,
-                            const char *funcname, long long linenr,
-                            const char *timestamp,
-                            unsigned int flags,
-                            const char *str,
-                            void *data);
+static void virLogOutputToFd(const char *category, int priority,
+                             const char *funcname, long long linenr,
+                             const char *timestamp,
+                             unsigned int flags,
+                             const char *str,
+                             void *data);
 
 /*
  * Logs accesses must be serialized though a mutex
@@ -807,32 +807,29 @@ static void virLogStackTraceToFd(int fd)
 #undef STRIP_DEPTH
 }
 
-static int virLogOutputToFd(const char *category ATTRIBUTE_UNUSED,
-                            int priority ATTRIBUTE_UNUSED,
-                            const char *funcname ATTRIBUTE_UNUSED,
-                            long long linenr ATTRIBUTE_UNUSED,
-                            const char *timestamp,
-                            unsigned int flags,
-                            const char *str,
-                            void *data)
+static void virLogOutputToFd(const char *category ATTRIBUTE_UNUSED,
+                             int priority ATTRIBUTE_UNUSED,
+                             const char *funcname ATTRIBUTE_UNUSED,
+                             long long linenr ATTRIBUTE_UNUSED,
+                             const char *timestamp,
+                             unsigned int flags,
+                             const char *str,
+                             void *data)
 {
     int fd = (intptr_t) data;
-    int ret;
     char *msg;
 
     if (fd < 0)
-        return -1;
+        return;
 
     if (virAsprintf(&msg, "%s: %s", timestamp, str) < 0)
-        return -1;
+        return;
 
-    ret = safewrite(fd, msg, strlen(msg));
+    ignore_value(safewrite(fd, msg, strlen(msg)));
     VIR_FREE(msg);
 
     if (flags & VIR_LOG_STACK_TRACE)
         virLogStackTraceToFd(fd);
-
-    return ret;
 }
 
 static void virLogCloseFd(void *data)
@@ -865,18 +862,18 @@ static int virLogAddOutputToFile(int priority, const char *file) {
 }
 
 #if HAVE_SYSLOG_H
-static int virLogOutputToSyslog(const char *category ATTRIBUTE_UNUSED,
-                                int priority,
-                                const char *funcname ATTRIBUTE_UNUSED,
-                                long long linenr ATTRIBUTE_UNUSED,
-                                const char *timestamp ATTRIBUTE_UNUSED,
-                                unsigned int flags,
-                                const char *str,
-                                void *data ATTRIBUTE_UNUSED)
+static void virLogOutputToSyslog(const char *category ATTRIBUTE_UNUSED,
+                                 int priority,
+                                 const char *funcname ATTRIBUTE_UNUSED,
+                                 long long linenr ATTRIBUTE_UNUSED,
+                                 const char *timestamp ATTRIBUTE_UNUSED,
+                                 unsigned int flags,
+                                 const char *str,
+                                 void *data ATTRIBUTE_UNUSED)
 {
     int prio;
 
-    virCheckFlags(VIR_LOG_STACK_TRACE, -1);
+    virCheckFlags(VIR_LOG_STACK_TRACE,);
 
     switch (priority) {
         case VIR_LOG_DEBUG:
@@ -895,7 +892,6 @@ static int virLogOutputToSyslog(const char *category ATTRIBUTE_UNUSED,
             prio = LOG_ERR;
     }
     syslog(prio, "%s", str);
-    return strlen(str);
 }
 
 static char *current_ident = NULL;

src/util/logging.h

@@ -94,15 +94,13 @@ typedef enum {
  * @data: extra output logging data
  *
  * Callback function used to output messages
- *
- * Returns the number of bytes written or -1 in case of error
  */
-typedef int (*virLogOutputFunc) (const char *category, int priority,
-                                 const char *funcname, long long linenr,
-                                 const char *timestamp,
-                                 unsigned int flags,
-                                 const char *str,
-                                 void *data);
+typedef void (*virLogOutputFunc) (const char *category, int priority,
+                                  const char *funcname, long long linenr,
+                                  const char *timestamp,
+                                  unsigned int flags,
+                                  const char *str,
+                                  void *data);
 
 /**
  * virLogCloseFunc:

tests/testutils.c

@@ -478,7 +478,7 @@ struct virtTestLogData {
 
 static struct virtTestLogData testLog = { VIR_BUFFER_INITIALIZER };
 
-static int
+static void
 virtTestLogOutput(const char *category ATTRIBUTE_UNUSED,
                   int priority ATTRIBUTE_UNUSED,
                   const char *funcname ATTRIBUTE_UNUSED,
@@ -489,9 +489,8 @@ virtTestLogOutput(const char *category ATTRIBUTE_UNUSED,
                   void *data)
 {
     struct virtTestLogData *log = data;
-    virCheckFlags(VIR_LOG_STACK_TRACE, -1);
+    virCheckFlags(VIR_LOG_STACK_TRACE,);
     virBufferAsprintf(&log->buf, "%s: %s", timestamp, str);
-    return strlen(timestamp) + 2 + strlen(str);
 }
 
 static void