Where Am I?
A drop-in two files library to locate the current executable and the current module on the file system.
Supported platforms:
- Windows
- Linux
- Mac
- iOS
- Android
- QNX Neutrino
- FreeBSD
- NetBSD
- DragonFly BSD
- SunOS
- OpenBSD
Just drop whereami.h
and whereami.c
into your build and get started. (see
also customizing compilation)
Usage
wai_getExecutablePath()
returns the path of the enclosing executablewai_getModulePath()
returns the path of the enclosing module
Example usage:
- first call
int length = wai_getExecutablePath(NULL, 0, NULL);
to retrieve the length of the path - allocate the destination buffer with
path = (char*)malloc(length + 1);
- call
wai_getExecutablePath(path, length, &dirname_length)
again to retrieve the path - add a terminal
NUL
character withpath[length] = '\0';
Here is the output of the example:
$ make -j -C _gnu-make
$ cp ./bin/mac-x86_64/library.dylib /tmp/
$ ./bin/mac-x86_64/executable --load-library=/tmp/library.dylib
executable path: /Users/gregory/Projects/whereami/bin/mac-x86_64/executable
dirname: /Users/gregory/Projects/whereami/bin/mac-x86_64
basename: executable
module path: /Users/gregory/Projects/whereami/bin/mac-x86_64/executable
dirname: /Users/gregory/Projects/whereami/bin/mac-x86_64
basename: executable
library loaded
executable path: /Users/gregory/Projects/whereami/bin/mac-x86_64/executable
dirname: /Users/gregory/Projects/whereami/bin/mac-x86_64
basename: executable
module path: /private/tmp/library.dylib
dirname: /private/tmp
basename: library.dylib
library unloaded
Customizing compilation
You can customize the library's behavior by defining the following macros:
WAI_FUNCSPEC
WAI_PREFIX
WAI_MALLOC
WAI_REALLOC
WAI_FREE
Compiling for Windows
There is a Visual Studio 2015 solution in the _win-vs14/
folder.
Compiling for Linux or Mac
There is a GNU Make 3.81 MakeFile
in the _gnu-make/
folder:
$ make -j -C _gnu-make/
Compiling for Mac
See above if you want to compile from command line. Otherwise there is an Xcode
project located in the _mac-xcode/
folder.
Compiling for iOS
There is an Xcode project located in the _ios-xcode/
folder.
If you prefer compiling from command line and deploying to a jailbroken device through SSH, use:
$ make -j -C _gnu-make/ binsubdir=ios CC="$(xcrun --sdk iphoneos --find clang) -isysroot $(xcrun --sdk iphoneos --show-sdk-path) -arch armv7 -arch armv7s -arch arm64" postbuild="codesign -s 'iPhone Developer'"
Compiling for Android
You will have to install the Android NDK, and point the $NDK_ROOT
environment
variable to the NDK path: e.g. export NDK_ROOT=/opt/android-ndk
(without a
trailing /
character).
Next, the easy way is to make a standalone Android toolchain with the following command:
$ $NDK_ROOT/build/tools/make_standalone_toolchain.py --arch=arm64 --api 21 --install-dir=/tmp/android-toolchain
Now you can compile the example by running:
$ make -j -C _gnu-make/ platform=android architecture=arm64 CC=/tmp/android-toolchain/bin/aarch64-linux-android-gcc CXX=/tmp/android-toolchain/bin/aarch64-linux-android-g++
Loading page aligned library straight from APKs is supported. To test, use the following:
$ zip -Z store app bin/android/library.so
$ zipalign -v -f -p 4 ./app.zip ./app.apk
Then copy bin/android/executable
and app.apk
to your Android device and
there launch:
$ ./executable --load-library=$PWD/app.apk!/bin/android/library.so