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FreeBSD 11.0 - man page for librtld_db (freebsd section 3)

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

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