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-rw-r--r--util/oslib-posix.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/util/oslib-posix.c b/util/oslib-posix.c
index 9ab2eb221b..5e8b4b39ed 100644
--- a/util/oslib-posix.c
+++ b/util/oslib-posix.c
@@ -182,7 +182,9 @@ void qemu_set_cloexec(int fd)
 {
     int f;
     f = fcntl(fd, F_GETFD);
-    fcntl(fd, F_SETFD, f | FD_CLOEXEC);
+    assert(f != -1);
+    f = fcntl(fd, F_SETFD, f | FD_CLOEXEC);
+    assert(f != -1);
 }
 
 /*