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[PATCH 8/9] bsd-user: implement sysctlbyname(2)
From: |
Warner Losh |
Subject: |
[PATCH 8/9] bsd-user: implement sysctlbyname(2) |
Date: |
Fri, 10 Feb 2023 16:18:28 -0700 |
From: Kyle Evans <kevans@FreeBSD.org>
do_freebsd_sysctlbyname needs to translate the 'name' back down to a OID
so we can intercept the special ones. Do that and call the common wrapper
do_freebsd_sysctl_oid.
Signed-off-by: Kyle Evans <kevans@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
---
bsd-user/freebsd/os-sys.c | 58 +++++++++++++++++++++++++++++++++++
bsd-user/freebsd/os-syscall.c | 4 +++
2 files changed, 62 insertions(+)
diff --git a/bsd-user/freebsd/os-sys.c b/bsd-user/freebsd/os-sys.c
index 13736936e5f..62c729dfe47 100644
--- a/bsd-user/freebsd/os-sys.c
+++ b/bsd-user/freebsd/os-sys.c
@@ -345,6 +345,64 @@ out:
return ret;
}
+/*
+ * This syscall was created to make sysctlbyname(3) more efficient.
+ * Unfortunately, because we have to fake some sysctls, we can't do that.
+ */
+abi_long do_freebsd_sysctlbyname(CPUArchState *env, abi_ulong namep,
+ int32_t namelen, abi_ulong oldp, abi_ulong oldlenp, abi_ulong newp,
+ abi_ulong newlen)
+{
+ abi_long ret;
+ void *holdp = NULL, *hnewp = NULL;
+ char *snamep;
+ int oid[CTL_MAXNAME + 2];
+ size_t holdlen, oidplen;
+ abi_ulong oldlen = 0;
+
+ if (oldlenp) {
+ if (get_user_ual(oldlen, oldlenp)) {
+ return -TARGET_EFAULT;
+ }
+ }
+ snamep = lock_user_string(namep);
+ if (snamep == NULL) {
+ return -TARGET_EFAULT;
+ }
+ if (newp) {
+ hnewp = lock_user(VERIFY_READ, newp, newlen, 1);
+ if (hnewp == NULL) {
+ return -TARGET_EFAULT;
+ }
+ }
+ if (oldp) {
+ holdp = lock_user(VERIFY_WRITE, oldp, oldlen, 0);
+ if (holdp == NULL) {
+ return -TARGET_EFAULT;
+ }
+ }
+ holdlen = oldlen;
+
+ oidplen = sizeof(oid) / sizeof(int);
+ if (sysctlnametomib(snamep, oid, &oidplen) != 0) {
+ return -TARGET_EINVAL;
+ }
+
+ ret = do_freebsd_sysctl_oid(env, oid, oidplen, holdp, &holdlen, hnewp,
+ newlen);
+
+ if (oldlenp) {
+ put_user_ual(holdlen, oldlenp);
+ }
+ unlock_user(snamep, namep, 0);
+ unlock_user(holdp, oldp, holdlen);
+ if (hnewp) {
+ unlock_user(hnewp, newp, 0);
+ }
+
+ return ret;
+}
+
abi_long do_freebsd_sysctl(CPUArchState *env, abi_ulong namep, int32_t namelen,
abi_ulong oldp, abi_ulong oldlenp, abi_ulong newp, abi_ulong newlen)
{
diff --git a/bsd-user/freebsd/os-syscall.c b/bsd-user/freebsd/os-syscall.c
index 20ab3d4d9a1..179a20c304b 100644
--- a/bsd-user/freebsd/os-syscall.c
+++ b/bsd-user/freebsd/os-syscall.c
@@ -498,6 +498,10 @@ static abi_long freebsd_syscall(void *cpu_env, int num,
abi_long arg1,
ret = do_freebsd_sysctl(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6);
break;
+ case TARGET_FREEBSD_NR___sysctlbyname: /* sysctlbyname(2) */
+ ret = do_freebsd_sysctlbyname(cpu_env, arg1, arg2, arg3, arg4, arg5,
arg6);
+ break;
+
case TARGET_FREEBSD_NR_sysarch: /* sysarch(2) */
ret = do_freebsd_sysarch(cpu_env, arg1, arg2);
break;
--
2.39.1
- Re: [PATCH 3/9] bsd-user: Add sysarch syscall, (continued)
[PATCH 7/9] bsd-user: do_freebsd_sysctl helper for sysctl(2), Warner Losh, 2023/02/10
[PATCH 8/9] bsd-user: implement sysctlbyname(2),
Warner Losh <=
[PATCH 9/9] bsd-user: Add -strict, Warner Losh, 2023/02/10
Re: [PATCH 0/9] 2023 Q1 bsd-user upstreaming: bugfixes and sysctl, Richard Henderson, 2023/02/11