[compiler-rt] compiler-rt: sanitizer_common: use close_range() instead of looping (PR #114442)

[Jessica Clarke via llvm-commits]

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@@ -543,7 +543,11 @@ pid_t StartSubprocess(const char *program, const char *const argv[],
       internal_close(stderr_fd);
     }
 
+#  if SANITIZER_FREEBSD
+    internal_close_range(3, ~0U, 0);
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jrtc27 wrote:

fd_t is a (signed) int, so ~0U is odd. Moreover, if you wanted to be generic across whatever integral type fd_t happens to be, ~0U will zero-extend to wider integers, regardless of the wider integer's type, and ~0 will sign-extend, regardless of the wider type. Or you can do `~(fd_t)0` if you want to be explicit and not have to think about integer conversion rules.

https://github.com/llvm/llvm-project/pull/114442