ios: Remove duplicate implementations of ReadStringSysctlByName

Bug: crashpad: 480
Change-Id: Ie37c557d2170f6d96968ec4922ec52bfc6ad8136
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/5580854
Reviewed-by: Mark Mentovai <mark@chromium.org>

test/ios/crash_type_xctest.mm

@@ -22,9 +22,11 @@
 #include "build/build_config.h"
 #include "client/length_delimited_ring_buffer.h"
 #import "test/ios/host/cptest_shared_object.h"
+#include "util/mac/sysctl.h"
 #include "util/mach/exception_types.h"
 #include "util/mach/mach_extensions.h"
 
+namespace crashpad {
 namespace {
 
 #if TARGET_OS_SIMULATOR
@@ -36,22 +38,13 @@ bool IsMacOSVersion143OrGreaterAndiOS16OrLess() {
     return false;
   }
 
-  size_t buf_len;
+  std::string build = crashpad::ReadStringSysctlByName("kern.osversion", false);
-  static constexpr char name[] = "kern.osversion";
-  if (sysctlbyname(name, nullptr, &buf_len, nullptr, 0) != 0) {
-    return false;
-  }
-
-  std::string build(buf_len - 1, '\0');
-  if (sysctlbyname(name, &build[0], &buf_len, nullptr, 0) != 0) {
-    return false;
-  }
-
   return std::stoi(build.substr(0, 2)) > 22;
 }
 #endif
 
 }  // namespace
+}  // namespace crashpad
 
 @interface CPTestTestCase : XCTestCase {
   XCUIApplication* app_;
@@ -352,7 +345,7 @@ bool IsMacOSVersion143OrGreaterAndiOS16OrLess() {
 #if TARGET_OS_SIMULATOR
   // This test will fail on older (<iOS17 simulators) when running on macOS 14.3
   // or newer due to a bug in Simulator. crbug.com/328282286
-  if (IsMacOSVersion143OrGreaterAndiOS16OrLess()) {
+  if (crashpad::IsMacOSVersion143OrGreaterAndiOS16OrLess()) {
     return;
   }
 #endif

util/BUILD.gn

@@ -313,6 +313,8 @@ crashpad_static_library("util") {
 
   if (crashpad_is_apple) {
     sources += [
+      "mac/sysctl.cc",
+      "mac/sysctl.h",
       "mac/xattr.cc",
       "mac/xattr.h",
       "mach/composite_mach_message_server.cc",
@@ -349,8 +351,6 @@ crashpad_static_library("util") {
       "mac/mac_util.h",
       "mac/service_management.cc",
       "mac/service_management.h",
-      "mac/sysctl.cc",
-      "mac/sysctl.h",
       "mach/bootstrap.cc",
       "mach/bootstrap.h",
       "mach/child_port_handshake.cc",

util/ios/ios_system_data_collector.mm

@@ -27,30 +27,11 @@
 #include "base/strings/stringprintf.h"
 #include "base/strings/sys_string_conversions.h"
 #include "build/build_config.h"
+#include "util/mac/sysctl.h"
 #include "util/misc/clock.h"
 
 namespace {
 
-std::string ReadStringSysctlByName(const char* name) {
-  size_t buf_len;
-  if (sysctlbyname(name, nullptr, &buf_len, nullptr, 0) != 0) {
-    PLOG(WARNING) << "sysctlbyname (size) " << name;
-    return std::string();
-  }
-
-  if (buf_len == 0) {
-    return std::string();
-  }
-
-  std::string value(buf_len - 1, '\0');
-  if (sysctlbyname(name, &value[0], &buf_len, nullptr, 0) != 0) {
-    PLOG(WARNING) << "sysctlbyname " << name;
-    return std::string();
-  }
-
-  return value;
-}
-
 template <typename T, void (T::*M)(void)>
 void AddObserver(CFStringRef notification_name, T* observer) {
   CFNotificationCenterAddObserver(
@@ -97,7 +78,7 @@ IOSSystemDataCollector::IOSSystemDataCollector()
   patch_version_ = base::saturated_cast<int>(version.patchVersion);
   processor_count_ =
       base::saturated_cast<int>([[NSProcessInfo processInfo] processorCount]);
-  build_ = ReadStringSysctlByName("kern.osversion");
+  build_ = ReadStringSysctlByName("kern.osversion", false);
   bundle_identifier_ =
       base::SysNSStringToUTF8([[NSBundle mainBundle] bundleIdentifier]);
 // If CRASHPAD_IS_IOS_APP_EXTENSION is defined, then the code is compiled with
@@ -110,7 +91,7 @@ IOSSystemDataCollector::IOSSystemDataCollector()
 #endif
 
 #if defined(ARCH_CPU_X86_64)
-  cpu_vendor_ = ReadStringSysctlByName("machdep.cpu.vendor");
+  cpu_vendor_ = ReadStringSysctlByName("machdep.cpu.vendor", false);
 #endif
   uint32_t addressable_bits = 0;
   size_t len = sizeof(uint32_t);