【发布时间】:2018-03-19 19:01:23
【问题描述】:
我正在尝试在 OSX 10.9 上的 this gist 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 成功找到了包装库和函数。
现在,作为一个测试,我想通过dtruss、OSX “strace” equivalent 运行这个可执行文件——我还按照该链接中的建议完成了sudo chmod u+s /usr/sbin/dtrace。所以我尝试在/tmp 文件夹中:
$ 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 在这里有效。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:
$ 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?
【问题讨论】: