[Bug 236714] Clang problem with rctl(8)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236714

--- Comment #12 from Mateusz Guzik <mjg at FreeBSD.org> ---
It is not being ignored. There is non-zero garbage in an area not written to by
sysctl, which makes the zero comparison fail.

diff --git a/usr.bin/rctl/rctl.c b/usr.bin/rctl/rctl.c
index 74073c13207e..8fb9e862aee8 100644
--- a/usr.bin/rctl/rctl.c
+++ b/usr.bin/rctl/rctl.c
@@ -378,12 +378,15 @@ print_rules(char *rules, int hflag, int nflag)
 static void
 enosys(void)
 {
-       int error, racct_enable;
+       int error, racct_enable = ~(0);
        size_t racct_enable_len;

+
+       printf("%x\n", racct_enable);
        racct_enable_len = sizeof(racct_enable);
        error = sysctlbyname("kern.racct.enable",
            &racct_enable, &racct_enable_len, NULL, 0);
+       printf("%x\n", racct_enable);

        if (error != 0) {
                if (errno == ENOENT)

Results in:
ffffffff
ffffff00
a.out: failed to show rules for '::': Function not implemented

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