Changeset 39690 in vbox for trunk/src/VBox/Runtime/r3/win

Timestamp:

Dec 30, 2011 1:06:50 PM (13 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

75528

Message:

IPRT: Added RTPipeQueryReadable.

File:

• trunk/src/VBox/Runtime/r3/win/pipe-win.cpp (modified) (1 diff)

trunk/src/VBox/Runtime/r3/win/pipe-win.cpp

@@ -1148 +1148 @@
 
 
+RTDECL(int) RTPipeQueryReadable(RTPIPE hPipe, size_t *pcbReadable)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->fRead, VERR_PIPE_NOT_READ);
+    AssertPtrReturn(pcbReadable, VERR_INVALID_POINTER);
+
+    int rc = RTCritSectEnter(&pThis->CritSect);
+    if (RT_FAILURE(rc))
+        return rc;
+
+    DWORD cbAvailable = 0;
+    if (PeekNamedPipe(pThis->hPipe, NULL, 0, NULL, &cbAvailable, NULL)
+        *pcbReadable = cbAvailable;
+    else
+        rc = RTErrConvertFromWin32(GetLastError());
+
+    RTCritSectLeave(&pThis->CritSect);
+    return rc;
+}
+
+
 /**
  * Internal RTPollSetAdd helper that returns the handle that should be added to