From: Stacey Son <s...@freebsd.org>
oidfmt uses undocumented system call to get the type of the sysctl.
Co-Authored-by: Sean Bruno <sbr...@freebsd.org>
Signed-off-by: Sean Bruno <sbr...@freebsd.org>
Co-Authored-by: Juergen Lock <n...@jelal.kn-bremen.de>
Signed-off-by: Juergen Lock <n...@jelal.kn-bremen.de>
Co-Authored-by: Raphael Kubo da Costa <rak...@freebsd.org>
Signed-off-by: Raphael Kubo da Costa <rak...@freebsd.org>
Signed-off-by: Stacey Son <s...@freebsd.org>
Reviewed-by: Warner Losh <i...@bsdimp.com>
Signed-off-by: Warner Losh <i...@bsdimp.com>
---
bsd-user/freebsd/os-sys.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/bsd-user/freebsd/os-sys.c b/bsd-user/freebsd/os-sys.c
index cfbc4148a5c..1df53a3e53b 100644
--- a/bsd-user/freebsd/os-sys.c
+++ b/bsd-user/freebsd/os-sys.c
@@ -121,6 +121,38 @@ static abi_ulong G_GNUC_UNUSED h2t_ulong_sat(u_long ul)
*/
#define bsd_get_ncpu() 1
+/*
+ * This uses the undocumented oidfmt interface to find the kind of a requested
+ * sysctl, see /sys/kern/kern_sysctl.c:sysctl_sysctl_oidfmt() (compare to
+ * src/sbin/sysctl/sysctl.c)
+ */
+static int G_GNUC_UNUSED oidfmt(int *oid, int len, char *fmt, uint32_t *kind)
+{
+ int qoid[CTL_MAXNAME + 2];
+ uint8_t buf[BUFSIZ];
+ int i;
+ size_t j;
+
+ qoid[0] = CTL_SYSCTL;
+ qoid[1] = CTL_SYSCTL_OIDFMT;
+ memcpy(qoid + 2, oid, len * sizeof(int));
+
+ j = sizeof(buf);
+ i = sysctl(qoid, len + 2, buf, &j, 0, 0);
+ if (i) {
+ return i;
+ }
+
+ if (kind) {
+ *kind = *(uint32_t *)buf;
+ }
+
+ if (fmt) {
+ strcpy(fmt, (char *)(buf + sizeof(uint32_t)));
+ }
+ return 0;
+}
+
/* sysarch() is architecture dependent. */
abi_long do_freebsd_sysarch(void *cpu_env, abi_long arg1, abi_long arg2)
{
--
2.39.1
