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-rw-r--r--c/src/exec/libcsupport/src/ftruncate.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/c/src/exec/libcsupport/src/ftruncate.c b/c/src/exec/libcsupport/src/ftruncate.c
index 5bcb2ea5d8..0e90db5c79 100644
--- a/c/src/exec/libcsupport/src/ftruncate.c
+++ b/c/src/exec/libcsupport/src/ftruncate.c
@@ -27,6 +27,7 @@ int ftruncate(
rtems_libio_check_fd( fd );
iop = rtems_libio_iop( fd );
+ rtems_libio_check_is_open(iop);
/*
* If this is not a file system based entity, it is an error.