xref: /freebsd/lib/libproc/proc_rtld.c (revision 0f2bd1e89db1a2f09268edea21e0ead329e092df)
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 = realloc(phdl->rdobjs, phdl->rdobjsz);
48 		if (phdl->rdobjs == NULL)
49 			return (-1);
50 	}
51 	memcpy(&phdl->rdobjs[phdl->nobjs++], lop, sizeof(*lop));
52 
53 	return (0);
54 }
55 
56 rd_agent_t *
57 proc_rdagent(struct proc_handle *phdl)
58 {
59 	if (phdl->rdap == NULL && phdl->status != PS_UNDEAD &&
60 	    phdl->status != PS_IDLE) {
61 		if ((phdl->rdap = rd_new(phdl)) != NULL) {
62 			phdl->rdobjs = malloc(sizeof(*phdl->rdobjs) * 64);
63 			phdl->rdobjsz = 64;
64 			if (phdl->rdobjs == NULL)
65 				return (phdl->rdap);
66 			rd_loadobj_iter(phdl->rdap, map_iter, phdl);
67 		}
68 	}
69 
70 	return (phdl->rdap);
71 }
72 
73 void
74 proc_updatesyms(struct proc_handle *phdl)
75 {
76 
77 	memset(phdl->rdobjs, 0, sizeof(*phdl->rdobjs) * phdl->rdobjsz);
78 	phdl->nobjs = 0;
79 	rd_loadobj_iter(phdl->rdap, map_iter, phdl);
80 }
81