dyld(3) 						   BSD Library Functions Manual 						   dyld(3)

NAME

     _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

SYNOPSIS

     #include <mach-o/dyld.h>

     uint32_t
     _dyld_image_count(void);

     const struct mach_header*
     _dyld_get_image_header(uint32_t image_index);

     intptr_t
     _dyld_get_image_vmaddr_slide(uint32_t image_index);

     const char*
     _dyld_get_image_name(uint32_t image_index);

     void
     _dyld_register_func_for_add_image(void (*func)(const struct mach_header* mh, intptr_t vmaddr_slide));

     void
     _dyld_register_func_for_remove_image(void (*func)(const struct mach_header* mh, intptr_t vmaddr_slide));

     int32_t
     NSVersionOfRunTimeLibrary(const char* libraryName);

     int32_t
     NSVersionOfLinkTimeLibrary(const char* libraryName);

     int
     _NSGetExecutablePath(char* buf, uint32_t* bufsize);

DESCRIPTION

     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
     returned.

     _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.

SEE ALSO

     dlopen(3) dladdr(3) dyld(1) http://developer.apple.com/documentation/DeveloperTools/Conceptual/MachOTopics/index.html

								 November 29, 2010