REDO_PREBINDING(3)

NAME
dependent_libs, redo_prebinding, needs_redo_prebinding - redo_prebinding library functions

SYNOPSIS

#include <mach-o/redo_prebinding.h>

extern char ** dependent_libs(
	const char *file_name,
	const char *program_name,
	char **error_message);

extern int redo_prebinding(
	const char *file_name,
	const char *executable_path,
	const char *root_dir,
	const char *output_file,
	const char *program_name,
	char **error_message,
	unsigned long slide_to_address /* not yet supported parameter */ );

extern enum needs_redo_prebinding_retval needs_redo_prebinding(
	const char *file_name,
	const char *executable_path,
	const char *root_dir,
	const char *program_name,
	char **error_message);

DESCRIPTION
These functions are intended for use by update_prebinding(1).

For all of these functions in the parameters program_name and error_message are used the same. For unrecoverable resource errors like being unable to allocate memory each function prints a message to stderr precede with program_name then calls exit(2) with the value EXIT_FAILURE. If a function is unsuccessful and if error_message pass to it is not NULL it is set to a malloc(3)'ed buffer with a NULL terminated string with the error message. For all functions when they return they release all resources (memory, open file descriptors, etc).

The file_name parameter for these functions may be of the form foo(bar) which is NOT interpreted as an archive name and a member name in that archive. As these functions deal with prebinding and prebound binaries ready for execution can't be in archives.

If the executable_path parameter for these functions is not NULL it is used for any dependent library has a path that starts with @executable_path. Then @executable_path is replaced with executable_path.

If the root_dir parameter is not NULL it is prepended to all the rooted dependent library paths.

dependent_libs() takes a file_name of a binary and returns a malloc(3)'ed array of pointers (NULL terminated) to names (also malloc(3)'ed and '\0' terminated names) of all the dependent libraries for that binary (not recursive) for all of the architectures of that binary. If successful dependent_libs() returns a non NULL value (at minimum a pointer to one NULL pointer). If unsuccessful dependent_libs returns NULL.

redo_prebinding() takes a file_name of a binary and redoes the prebinding on it. If output_file is not NULL the update file is written to output_file, if not it is written to file_name. If redo_prebinding() is successful it returns 0 otherwise it returns 1. If not all architectures can be updated it is not successful and nothing is done. The not yet supported slide_to_address parameter should be passed a value of zero. When supported a non-zero value will be the address a dynamic library is to be relocated to as its preferred address.

needs_redo_prebinding() takes a file_name and determines if it is a binary and if its prebinding is uptodate. It returns one of the return values below depending on the state of the binary and libraries. The value returned is based on the first architecture for fat files.

Return values for needs_redo_prebinding():

PREBINDING_UPTODATE
    a binary who's prebinding is up todate.

PREBINDING_OUTOFDATE
    a binary who's prebinding is out of date.

NOT_PREBOUND
    a binary, but not built prebound.

NOT_PREBINDABLE
    not a binary, prebinding does not apply.

PREBINDING_UNKNOWN
    a binary who's prebinding can't be determined because it is malformed, a library it depends on is missing, etc.

SEE ALSO
redo_prebinding(1), update_prebinding(1)