valgrind 和 iOS SDK 4.2？

Question

使用 valgrind 运行 iOS 4.2 应用程序时遇到问题。

我从 Macports 安装了 valgrind 3.6.0-SVN。 Xcode 3.2.5。

当我修改 main() 来运行 valgrind 时，我得到以下输出：

Detected an attempt to call a symbol in system libraries that is not present on the iPhone:
open$UNIX2003 called from function _vgrZU_libSystemZdZaZddylib_arc4random in image vgpreload_core-x86-darwin.so.
If you are encountering this problem running a simulator binary within gdb, make sure you 'set start-with-shell off' first.

==99640== 
==99640== Process terminating with default action of signal 6 (SIGABRT)
==99640==    at 0x8B5DEF6: __kill (in /usr/lib/libSystem.B.dylib)
==99640==    by 0x8BF062C: raise (in /usr/lib/libSystem.B.dylib)
==99640==    by 0x8C066E3: abort (in /usr/lib/libSystem.B.dylib)
==99640==    by 0x33F2547: __springboard_unimplemented (in /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk/usr/lib/libSystem.dylib)
==99640==    by 0x33FC208: open$UNIX2003 (in /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk/usr/lib/libSystem.dylib)
==99640==    by 0x1AAD6F3: arc4random (vg_preloaded.c:163)
==99640==    by 0x8AFFB7E: create_scalable_zone (in /usr/lib/libSystem.B.dylib)
==99640==    by 0x8AFF7EA: _malloc_initialize (in /usr/lib/libSystem.B.dylib)
==99640==    by 0x8B23449: malloc_create_zone (in /usr/lib/libSystem.B.dylib)
==99640==    by 0x8B233F8: _dispatch_ccache_init (in /usr/lib/libSystem.B.dylib)
==99640==    by 0x8B21E0D: dispatch_once_f (in /usr/lib/libSystem.B.dylib)
==99640==    by 0x8B233D3: _dispatch_continuation_alloc_from_heap (in /usr/lib/libSystem.B.dylib)

错误似乎非常清楚。我该如何解决这个问题？我听说过在 SDK 3.x 上运行 valgrind 的成功尝试。发生了什么变化？

还有其他建议吗？

Answer 1

这是一个可怕的黑客行为，我不知道这意味着什么......但它确实解决了问题：

在你的 valgrind 源代码中，打开 vg_preloaded.c 并找到第 163 行（在你的堆栈跟踪中引用）。将那里的代码更改为：

/*    if (rnd < 0) rnd = open("/dev/random", O_RDONLY);                     
      read(rnd, &result, sizeof(result)); */
result = random();

这似乎是阻止 valgrind 工作的唯一因素...您的情况可能会有所不同。

Answer 2

将以下内容添加到 Objective-C 文件之一的顶部：

#import "stdio.h"
#import "fcntl.h"

int open$UNIX2003(const char *pathname, int flags, mode_t mode) {
    return open(pathname, flags, mode);
}

int read$UNIX2003(int fildes, void *buf, size_t nbyte) {
    return read(fildes, buf, nbyte);
}

int close$UNIX2003(int fildes) {
    return close(fildes);
}