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[PATCH v3 05/11] bsd-user: Helper routines oidfmt
From: |
Warner Losh |
Subject: |
[PATCH v3 05/11] bsd-user: Helper routines oidfmt |
Date: |
Thu, 16 Feb 2023 16:33:47 -0700 |
From: Stacey Son <sson@FreeBSD.org>
oidfmt uses undocumented system call to get the type of the sysctl.
Co-Authored-by: Sean Bruno <sbruno@FreeBSD.org>
Signed-off-by: Sean Bruno <sbruno@FreeBSD.org>
Co-Authored-by: Juergen Lock <nox@jelal.kn-bremen.de>
Signed-off-by: Juergen Lock <nox@jelal.kn-bremen.de>
Co-Authored-by: Raphael Kubo da Costa <rakuco@FreeBSD.org>
Signed-off-by: Raphael Kubo da Costa <rakuco@FreeBSD.org>
Signed-off-by: Stacey Son <sson@FreeBSD.org>
Reviewed-by: Warner Losh <imp@bsdimp.com>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Acked-by: Richard Henderson <richard.henderson@linaro.org>
---
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 9b84e90cb32..1bf2b51820e 100644
--- a/bsd-user/freebsd/os-sys.c
+++ b/bsd-user/freebsd/os-sys.c
@@ -107,6 +107,38 @@ static abi_ulong G_GNUC_UNUSED h2g_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
- [PATCH v3 00/11] 2023 Q1 bsd-user upstreaming: bugfixes and sysctl, Warner Losh, 2023/02/16
- [PATCH v3 01/11] bsd-user: Don't truncate the return value from freebsd_syscall, Warner Losh, 2023/02/16
- [PATCH v3 03/11] bsd-user: Add sysarch syscall, Warner Losh, 2023/02/16
- [PATCH v3 05/11] bsd-user: Helper routines oidfmt,
Warner Losh <=
- [PATCH v3 06/11] bsd-user: Helper routines h2g_old_sysctl, Warner Losh, 2023/02/16
- [PATCH v3 07/11] bsd-user: sysctl helper funtions: sysctl_name2oid and sysctl_oidfmt, Warner Losh, 2023/02/16
- [PATCH v3 02/11] build: Don't specify -no-pie for --static user-mode programs, Warner Losh, 2023/02/16
- [PATCH v3 09/11] bsd-user: Start translation of arch-specific sysctls, Warner Losh, 2023/02/16
- [PATCH v3 08/11] bsd-user: common routine do_freebsd_sysctl_oid for all sysctl variants, Warner Losh, 2023/02/16
- [PATCH v3 04/11] bsd-user: various helper routines for sysctl, Warner Losh, 2023/02/16
- [PATCH v3 10/11] bsd-user: do_freebsd_sysctl helper for sysctl(2), Warner Losh, 2023/02/16