sysctl utils

src/common/sysctl.c

@@ -0,0 +1,53 @@
+#include "sysctl.h"
+
+#include <sys/sysctl.h>
+
+void ffSysctlGetString(const char* propName, FFstrbuf* result)
+{
+    size_t neededLength;
+    if(sysctlbyname(propName, NULL, &neededLength, NULL, 0) != 0 || neededLength == 0)
+        return;
+
+    ffStrbufEnsureFree(result, (uint32_t) neededLength);
+
+    if(sysctlbyname(propName, result->chars + result->length, &neededLength, NULL, 0) == 0)
+        result->length += (uint32_t) neededLength;
+
+    result->chars[result->length] = '\0';
+}
+
+int ffSysctlGetInt(const char* propName, int defaultValue)
+{
+    int result;
+    size_t neededLength = sizeof(result);
+    if(sysctlbyname(propName, &result, &neededLength, NULL, 0) != 0)
+        return defaultValue;
+    return result;
+}
+
+int64_t ffSysctlGetInt64(const char* propName, int64_t defaultValue)
+{
+    int64_t result;
+    size_t neededLength = sizeof(result);
+    if(sysctlbyname(propName, &result, &neededLength, NULL, 0) != 0)
+        return defaultValue;
+    return result;
+}
+
+void* ffSysctlGetData(int* request, int requestLength, size_t* resultLength)
+{
+    if(sysctl(request, requestLength, NULL, &length, NULL, 0) != 0)
+        return NULL;
+
+    void* data = malloc(*length);
+    if(data == NULL)
+        return NULL;
+
+    if(sysctl(request, requestLength, data, length, NULL, 0) != 0)
+    {
+        free(data);
+        return NULL;
+    }
+
+    return data;
+}