[Qemu-devel] [RFC PATCH v6 15/20] replay: check return values of fwrite

[Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>]

This patch adds error reporting when fwrite cannot completely
save the buffer to the file.

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>

--

v3: also check putc() return value
---
 replay/replay-internal.c |   17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/replay/replay-internal.c b/replay/replay-internal.c
index 139b9fa..fd88b5b 100644
--- a/replay/replay-internal.c
+++ b/replay/replay-internal.c
@@ -24,12 +24,23 @@
 static QemuMutex lock;
 
 /* File for replay writing */
+static bool write_error;
 FILE *replay_file;
 
+static void replay_write_error(void)
+{
+    if (!write_error) {
+        error_report("replay write error");
+        write_error = true;
+    }
+}
+
 void replay_put_byte(uint8_t byte)
 {
     if (replay_file) {
-        putc(byte, replay_file);
+        if (putc(byte, replay_file) == EOF) {
+            replay_write_error();
+        }
     }
 }
 
@@ -62,7 +73,9 @@ void replay_put_array(const uint8_t *buf, size_t size)
 {
     if (replay_file) {
         replay_put_dword(size);
-        fwrite(buf, 1, size, replay_file);
+        if (fwrite(buf, 1, size, replay_file) != size) {
+            replay_write_error();
+        }
     }
 }