librtld_db(3) [freebsd man page]

LIBRTLD_DB(3)						   BSD Library Functions Manual 					     LIBRTLD_DB(3)

NAME

     librtld_db -- library for run-time linker debugging

LIBRARY

     library ``librtld_db''

SYNOPSIS

     #include <rtld_db.h>

     void
     rd_delete(rd_agent_t *rdap);

     char *
     rd_errstr(rd_err_e rderr);

     rd_err_e
     rd_event_addr(rd_agent_t *rdap, rd_event_e event, rd_notify_t *notify);

     rd_err_e
     rd_event_enable(rd_agent_t *rdap, int onoff);

     rd_err_e
     rd_event_getmsg(rd_agent_t *rdap, rd_event_msg_t *msg);

     rd_err_e
     rd_init(int version);

     typedef int
     rl_iter_f(const rd_loadobj_t *, void *);

     rd_err_e
     rd_loadobj_iter(rd_agent_t *rdap, rl_iter_f *cb, void *clnt_data);

     void
     rd_log(const int onoff);

     rd_agent_t *
     rd_new(struct proc_handle *php);

     rd_err_e
     rd_objpad_enable(rd_agent_t *rdap, size_t padsize);

     rd_err_e
     rd_plt_resolution(rd_agent_t *rdap, uintptr_t pc, struct proc *proc, uintptr_t plt_base, rd_plt_info_t *rpi);

     rd_err_e
     rd_reset(rd_agent_t *rdap);

DESCRIPTION

     The librtld_db library provides a debugging interface to the run-time linker (rtld).  This library must be used along with libproc(3).

     Most library functions take a rd_agent_t argument.  This argument is an opaque structure containing information associated with the current
     status of the agent.

     Before you start using librtld_db you should call rd_init() with the RD_VERSION argument.	This initializes the library to the correct ver-
     sion your program was compiled with and provides proper ABI stability.

     What follows is a description of what each function.

     rd_new() creates a new librtld_db agent.  The php argument should be the proc_handle you received from libproc(3).

     rd_reset() resets your previously created agent.

     rd_delete() deallocates the resources associated with the agent.

     rd_errstr() returns an error string describing the error present in rderr.

     rd_event_enable() enables reporting of events.  This function always returns RD_OK.

     rd_event_addr() returns the event address corresponding to the event parameter.  At the moment we only report events of type RD_NOTIFY_BPT.

     rd_event_getmsg() returns the message associated with the latest event.  At the moment only RD_POSTINIT events are supported.

     rd_loadobj_iter() allows you to iterate over the program's loaded objects.  cb is a callback of type rl_iter_f().

RETURN VALUES

     Most functions return an rd_err_e type error.  The error codes are described in the header file for this library.	You can get the error
     string using rd_errstr().

SEE ALSO

     ld(1), ld-elf.so.1(1), ld.so(1), rtld(1), libproc(3)

HISTORY

     The librtld_db library first appeared in FreeBSD 9.0 and was modeled after the same library present in the Solaris operating system.

AUTHORS

     The librtld_db library and this manual page were written by Rui Paulo <rpaulo@FreeBSD.org> under sponsorship from the FreeBSD Foundation.

CAVEATS

     The functions rd_event_enable(), rd_log(), rd_objpad_enable() and rd_plt_resolution() are not yet implemented.

BSD
								   June 10, 2010							       BSD