server: Map ETXTBSY to STATUS_SHARING_VIOLATION.

server/file.c

diff --git a/server/file.c b/server/file.c
index 0932414..a8152da 100644
--- a/server/file.c
+++ b/server/file.c
@@ -286,6 +286,7 @@
 {
     switch (errno)
     {
+    case ETXTBSY:
     case EAGAIN:    set_error( STATUS_SHARING_VIOLATION ); break;
     case EBADF:     set_error( STATUS_INVALID_HANDLE ); break;
     case ENOSPC:    set_error( STATUS_DISK_FULL ); break;