lib/libproc/proc_rtld.c

   1 /*
   2  * Copyright (c) 2010 The FreeBSD Foundation
   3  * All rights reserved.
   4  *
   5  * This software was developed by Rui Paulo under sponsorship from the
   6  * FreeBSD Foundation.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31 __FBSDID("$FreeBSD$");
  32
  33 #include <stdio.h>
  34 #include <string.h>
  35 #include <stdlib.h>
  36 #include <rtld_db.h>
  37 #include "libproc.h"
  38 #include "_libproc.h"
  39
  40 static int
  41 map_iter(const rd_loadobj_t *lop, void *arg)
  42 {
  43         struct proc_handle *phdl = arg;
  44
  45         if (phdl->nobjs >= phdl->rdobjsz) {
  46                 phdl->rdobjsz *= 2;
  47                 phdl->rdobjs = reallocf(phdl->rdobjs, sizeof(*phdl->rdobjs) *
  48                     phdl->rdobjsz);
  49                 if (phdl->rdobjs == NULL)
  50                         return (-1);
  51         }
  52         if (strcmp(lop->rdl_path, phdl->execpath) == 0 &&
  53             (lop->rdl_prot & RD_RDL_X) != 0)
  54                 phdl->rdexec = &phdl->rdobjs[phdl->nobjs];
  55         memcpy(&phdl->rdobjs[phdl->nobjs++], lop, sizeof(*lop));
  56
  57         return (0);
  58 }
  59
  60 rd_agent_t *
  61 proc_rdagent(struct proc_handle *phdl)
  62 {
  63         if (phdl->rdap == NULL && phdl->status != PS_UNDEAD &&
  64             phdl->status != PS_IDLE) {
  65                 if ((phdl->rdap = rd_new(phdl)) != NULL) {
  66                         phdl->rdobjs = malloc(sizeof(*phdl->rdobjs) * 64);
  67                         phdl->rdobjsz = 64;
  68                         if (phdl->rdobjs == NULL)
  69                                 return (phdl->rdap);
  70                         rd_loadobj_iter(phdl->rdap, map_iter, phdl);
  71                 }
  72         }
  73
  74         return (phdl->rdap);
  75 }
  76
  77 void
  78 proc_updatesyms(struct proc_handle *phdl)
  79 {
  80
  81         memset(phdl->rdobjs, 0, sizeof(*phdl->rdobjs) * phdl->rdobjsz);
  82         phdl->nobjs = 0;
  83         rd_loadobj_iter(phdl->rdap, map_iter, phdl);
  84 }