dyld(3) BSD Library Functions Manual dyld(3)
_dyld_image_count, _dyld_get_image_header, _dyld_get_image_vmaddr_slide, _dyld_get_image_name, _dyld_register_func_for_add_image,
_dyld_register_func_for_remove_image, NSVersionOfRunTimeLibrary, NSVersionOfLinkTimeLibrary _NSGetExecutablePath
const struct mach_header*
_dyld_register_func_for_add_image(void (*func)(const struct mach_header* mh, intptr_t vmaddr_slide));
_dyld_register_func_for_remove_image(void (*func)(const struct mach_header* mh, intptr_t vmaddr_slide));
NSVersionOfRunTimeLibrary(const char* libraryName);
NSVersionOfLinkTimeLibrary(const char* libraryName);
_NSGetExecutablePath(char* buf, uint32_t* bufsize);
These routines provide additional introspection of dyld beyond that provided by dlopen() and dladdr()
_dyld_image_count() returns the current number of images mapped in by dyld. Note that using this count to iterate all images is not thread
safe, because another thread may be adding or removing images during the iteration.
_dyld_get_image_header() returns a pointer to the mach header of the image indexed by image_index. If image_index is out of range, NULL is
_dyld_get_image_vmaddr_slide() returns the virtural memory address slide amount of the image indexed by image_index. If image_index is out of
range zero is returned.
_dyld_get_image_name() returns the name of the image indexed by image_index. The C-string continues to be owned by dyld and should not
deleted. If image_index is out of range NULL is returned.
_dyld_register_func_for_add_image() registers the specified function to be called when a new image is added (a bundle or a dynamic shared
library) to the program. When this function is first registered it is called for once for each image that is currently part of the process.
_dyld_register_func_for_remove_image() registers the specified function to be called when an image is removed (a bundle or a dynamic shared
library) from the process.
NSVersionOfRunTimeLibrary() returns the current_version number of the currently loaded dylib specifed by the libraryName. The libraryName
parameter would be "bar" for /path/libbar.3.dylib and "Foo" for /path/Foo.framework/Versions/A/Foo. This function returns -1 if no such
library is loaded.
NSVersionOfLinkTimeLibrary() returns the current_version number that the main executable was linked against at build time. The libraryName
parameter would be "bar" for /path/libbar.3.dylib and "Foo" for /path/Foo.framework/Versions/A/Foo. This function returns -1 if the main
executable did not link against the specified library.
_NSGetExecutablePath() copies the path of the main executable into the buffer buf. The bufsize parameter should initially be the size of the
buffer. This function returns 0 if the path was successfully copied, and * bufsize is left unchanged. It returns -1 if the buffer is not
large enough, and * bufsize is set to the size required. Note that _NSGetExecutablePath() will return "a path" to the executable not a "real
path" to the executable. That is, the path may be a symbolic link and not the real file. With deep directories the total bufsize needed
could be more than MAXPATHLEN.
dlopen(3) dladdr(3) dyld(1) http://developer.apple.com/documentation/DeveloperTools/Conceptual/MachOTopics/index.html
November 29, 2010