[PATCH v2 13/24] Add more meaningful syslog reporting

[Christophe de Dinechin <christophe@xxxxxxxxxxxx>]

From: Christophe de Dinechin <dinechin@xxxxxxxxxx>

Signed-off-by: Christophe de Dinechin <dinechin@xxxxxxxxxx>
---
 src/spice-streaming-agent.cpp | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/src/spice-streaming-agent.cpp b/src/spice-streaming-agent.cpp
index 85d055b..5fef102 100644
--- a/src/spice-streaming-agent.cpp
+++ b/src/spice-streaming-agent.cpp
@@ -77,10 +77,13 @@ public:
         std::lock_guard<std::mutex> stream_guard(mutex);
         size_t expected = message.size(payload...);
         size_t written = message.write(*this, payload...);
-        return written == expected;
+        bool result = written == expected;
+        if (!result)
+            syslog(LOG_WARNING, "sent only %zu bytes out of %zu", written, expected);
+        return result;
     }
 
-    size_t write_all(const void *buf, const size_t len);
+    size_t write_all(const char *what, const void *buf, const size_t len);
 
 private:
     int streamfd = -1;
@@ -122,7 +125,7 @@ struct FormatMessage : Message<StreamMsgFormat, FormatMessage>
     }
     size_t write(Stream &stream, unsigned w, unsigned h, uint8_t c)
     {
-        return stream.write_all(this, sizeof(message_t));
+        return stream.write_all("FormatMessage", this, sizeof(message_t));
     }
 };
 
@@ -141,8 +144,8 @@ struct FrameMessage : Message<StreamMsgData, FrameMessage>
     }
     size_t write(Stream &stream, const void *frame, size_t length)
     {
-        return stream.write_all(this, sizeof(message_t))
-            +  stream.write_all(frame, length);
+        return stream.write_all("FrameMessage header", this, sizeof(message_t))
+            +  stream.write_all("FrameMessage frame", frame, length);
     }
 };
 
@@ -179,8 +182,8 @@ struct X11CursorMessage : Message<StreamMsgCursorSet, X11CursorMessage>
     size_t write(Stream &stream, XFixesCursorImage *cursor)
     {
         unsigned pixel_size = pixel_count(cursor) * sizeof(uint32_t);
-        return stream.write_all(this, sizeof(message_t))
-            +  stream.write_all(pixels.get(), pixel_size);
+        return stream.write_all("X11CursorMessage header", this, sizeof(message_t))
+            +  stream.write_all("X11CursorMessage pixels", pixels.get(), pixel_size);
     }
     void fill_pixels(XFixesCursorImage *cursor)
     {
@@ -316,7 +319,7 @@ int Stream::read_command(bool blocking)
     return 1;
 }
 
-size_t Stream::write_all(const void *buf, const size_t len)
+size_t Stream::write_all(const char *what, const void *buf, const size_t len)
 {
     size_t written = 0;
     while (written < len) {
@@ -325,12 +328,12 @@ size_t Stream::write_all(const void *buf, const size_t len)
             if (errno == EINTR) {
                 continue;
             }
-            syslog(LOG_ERR, "write failed - %m");
+            syslog(LOG_ERR, "write %s failed - %m", what);
             return l;
         }
         written += l;
     }
-    syslog(LOG_DEBUG, "write_all -- %u bytes written\n", (unsigned)written);
+    syslog(LOG_DEBUG, "write %s -- %u bytes written\n", what, (unsigned)written);
     return written;
 }
 
-- 
2.13.5 (Apple Git-94)

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