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-rw-r--r--cpukit/libcsupport/include/rtems/libio.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/cpukit/libcsupport/include/rtems/libio.h b/cpukit/libcsupport/include/rtems/libio.h
index 3cc4648863..d5255769e6 100644
--- a/cpukit/libcsupport/include/rtems/libio.h
+++ b/cpukit/libcsupport/include/rtems/libio.h
@@ -452,6 +452,7 @@ typedef int (*rtems_libio_lseek_t)(
#define RTEMS_IO_GET_ATTRIBUTES 1
#define RTEMS_IO_SET_ATTRIBUTES 2
#define RTEMS_IO_TCDRAIN 3
+#define FIONREAD 4
/*
* The following macros are used to build up the permissions sets