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我正在尝试在 OSX 10.9的这个要点上构建示例:

cd /tmp
git clone https://gist.github.com/ecfd80885b9ddf6734192c056cf48bf4.git fopentest
cd fopentest
bash buildrun.sh

构建成功 - 此外,我可以在终端输出中看到以下内容:

...
+ DYLD_BIND_AT_LAUNCH=YES
+ ./fopentest.exe ./mytestfile.txt
This is a wrapper function for fopen.
=== this is mytestfile.txt ===
Second line here...
Third line here...

这意味着调用DYLD_BIND_AT_LAUNCH=YES ./fopentest.exe ./mytestfile.txt成功地找到了包装库和函数。

dtruss现在,作为一个测试,我想通过OSX “strace”等价物运行这个可执行文件——我也sudo chmod u+s /usr/sbin/dtrace按照该链接中的建议进行了操作。所以我在/tmp文件夹中尝试:

$ DYLD_BIND_AT_LAUNCH=YES dtruss ./fopentest.exe ./mytestfile.txt 2>&1 | grep wrap
This is a wrapper function for fopen.
stat64("libwrapper.dylib\0", 0x7FFF5A7DF248, 0x7FFF5A7E00E0)         = 0 0
open("libwrapper.dylib\0", 0x0, 0x0)         = 3 0
write_nocancel(0x1, "This is a wrapper function for fopen.\n=== this is mytestfile.txt ===\nSecond line here...\nThird line here...\n\0", 0x6C)      = 108 0

所以,显然dtruss这里有效。但是,我在不同的目录中有完全相同的文件,为什么我尝试运行相同的命令dtruss失败了:

$ DYLD_BIND_AT_LAUNCH=YES dtruss ./fopentest.exe ./mytestfile.txt 2>&1 | grep wrap
dyld: Library not loaded: libwrapper.dylib
stat64("libwrapper.dylib\0", 0x7FFF4FD85228, 0x7FFF4FD860C0)         = 0 0
open("libwrapper.dylib\0", 0x0, 0x0)         = -1 Err#2
stat64("/Users/MYNAME/lib/libwrapper.dylib\0", 0x7FFF4FD85A08, 0x7FFF4FD860C0)       = -1 Err#2
stat64("/usr/local/lib/libwrapper.dylib\0", 0x7FFF4FD85A08, 0x7FFF4FD860C0)      = -1 Err#2
stat64("/usr/lib/libwrapper.dylib\0", 0x7FFF4FD85A18, 0x7FFF4FD860C0)        = -1 Err#2

这可能是什么原因?

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1 回答 1

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嗯,我想我明白是什么原因了:dtruss找不到库的目录,实际上是通过sshfs;挂载的。mount显示该路径:

MYOTHERNAME@myRemotePC:/media/Test1 on /media/Test1 (osxfusefs, nodev, nosuid, synchronous, mounted by MYNAME)

所以,如果我尝试打电话DYLD_BIND_AT_LAUNCH=YES dtruss ./fopentest.exe ./mytestfile.txt/media/Test1/fopentest/那么我会得到“ dyld: Library not loaded: libwrapper.dylib”。

但是,如果我将该文件夹移动到“正确”文件系统中的其他位置,例如 in $HOME: mv /media/Test1/fopentest ~/,我什至不必重建,我只需调用DYLD_BIND_AT_LAUNCH=YES dtruss ./fopentest.exe ./mytestfile.txtin~/fopentest/并且调用成功......

不知道为什么会发生这种情况-因此肯定会感谢提供更多信息的答案...

于 2017-10-08T14:03:17.727 回答