From 71728247abd2aa5ee1dbb63681d18a76253e0c08 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=9D=8E=E9=80=9A=E6=B4=B2?= <zhangsongcui3371@sina.com>
Date: Tue, 25 Aug 2026 23:24:31 +0800
Subject: [PATCH] Common (Sysctl): handle varying data lengths in integer
 retrieval functions

---
 src/common/impl/sysctl.c | 56 ++++++++++++++++++++++++++++++++++------
 1 file changed, 48 insertions(+), 8 deletions(-)

diff --git a/src/common/impl/sysctl.c b/src/common/impl/sysctl.c
index e17b5c348..122a79091 100644
--- a/src/common/impl/sysctl.c
+++ b/src/common/impl/sysctl.c
@@ -22,21 +22,41 @@ const char* ffSysctlGetString(int mib1, int mib2, FFstrbuf* result) {
 }
 
 int ffSysctlGetInt(int mib1, int mib2, int defaultValue) {
-    int result;
+    alignas(int) uint8_t result[sizeof(int)];
     size_t neededLength = sizeof(result);
     if (sysctl((int[]) { mib1, mib2 }, 2, &result, &neededLength, nullptr, 0) != 0) {
         return defaultValue;
     }
-    return result;
+    switch (neededLength) {
+        case sizeof(int32_t):
+            return *(int32_t*)result;
+        case sizeof(int16_t):
+            return *(int16_t*)result;
+        case sizeof(int8_t):
+            return *(int8_t*)result;
+        default:
+            return defaultValue;
+    }
 }
 
 int64_t ffSysctlGetInt64(int mib1, int mib2, int64_t defaultValue) {
-    int64_t result;
+    alignas(int64_t) uint8_t result[sizeof(int64_t)];
     size_t neededLength = sizeof(result);
     if (sysctl((int[]) { mib1, mib2 }, 2, &result, &neededLength, nullptr, 0) != 0) {
         return defaultValue;
     }
-    return result;
+    switch (neededLength) {
+        case sizeof(int64_t):
+            return *(int64_t*)result;
+        case sizeof(int32_t):
+            return *(int32_t*)result;
+        case sizeof(int16_t):
+            return *(int16_t*)result;
+        case sizeof(int8_t):
+            return *(int8_t*)result;
+        default:
+            return defaultValue;
+    }
 }
 #else
 const char* ffSysctlGetString(const char* propName, FFstrbuf* result) {
@@ -59,21 +79,41 @@ const char* ffSysctlGetString(const char* propName, FFstrbuf* result) {
 }
 
 int ffSysctlGetInt(const char* propName, int defaultValue) {
-    int result;
+    alignas(int) uint8_t result[sizeof(int)];
     size_t neededLength = sizeof(result);
     if (sysctlbyname(propName, &result, &neededLength, nullptr, 0) != 0) {
         return defaultValue;
     }
-    return result;
+    switch (neededLength) {
+        case sizeof(int32_t):
+            return *(int32_t*)result;
+        case sizeof(int16_t):
+            return *(int16_t*)result;
+        case sizeof(int8_t):
+            return *(int8_t*)result;
+        default:
+            return defaultValue;
+    }
 }
 
 int64_t ffSysctlGetInt64(const char* propName, int64_t defaultValue) {
-    int64_t result;
+    alignas(int64_t) uint8_t result[sizeof(int64_t)];
     size_t neededLength = sizeof(result);
     if (sysctlbyname(propName, &result, &neededLength, nullptr, 0) != 0) {
         return defaultValue;
     }
-    return result;
+    switch (neededLength) {
+        case sizeof(int64_t):
+            return *(int64_t*)result;
+        case sizeof(int32_t):
+            return *(int32_t*)result;
+        case sizeof(int16_t):
+            return *(int16_t*)result;
+        case sizeof(int8_t):
+            return *(int8_t*)result;
+        default:
+            return defaultValue;
+    }
 }
 #endif // OpenBSD