Commit | Line | Data |
---|---|---|
b13d93c2 PW |
1 | /* |
2 | * Copyright (C) 2013 Paul Woegerer <paul.woegerer@mentor.com> | |
3 | * | |
4 | * This library is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU Lesser General Public | |
6 | * License as published by the Free Software Foundation; version 2.1 of | |
7 | * the License. | |
8 | * | |
9 | * This library is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * Lesser General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU Lesser General Public | |
15 | * License along with this library; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
17 | */ | |
18 | ||
5aed31fc | 19 | #define _LGPL_SOURCE |
b13d93c2 | 20 | #define _GNU_SOURCE |
f02baefb | 21 | #include <lttng/ust-dlfcn.h> |
b13d93c2 | 22 | #include <inttypes.h> |
b13d93c2 PW |
23 | #include <link.h> |
24 | #include <unistd.h> | |
25 | #include <stdio.h> | |
13436238 PW |
26 | #include <limits.h> |
27 | #include <sys/types.h> | |
28 | #include <sys/stat.h> | |
b13d93c2 PW |
29 | #include <signal.h> |
30 | #include <sched.h> | |
31 | #include <stdarg.h> | |
82556ac0 | 32 | #include <helper.h> |
eb2b066f | 33 | #include "usterr-signal-safe.h" |
b13d93c2 PW |
34 | |
35 | #include <lttng/ust-compiler.h> | |
36 | #include <lttng/ust.h> | |
37 | ||
13436238 | 38 | #define TRACEPOINT_DEFINE |
6d4658aa | 39 | #include "ust_dl.h" |
13436238 | 40 | |
b13d93c2 PW |
41 | static void *(*__lttng_ust_plibc_dlopen)(const char *filename, int flag); |
42 | static int (*__lttng_ust_plibc_dlclose)(void *handle); | |
b13d93c2 PW |
43 | |
44 | static | |
45 | void *_lttng_ust_dl_libc_dlopen(const char *filename, int flag) | |
46 | { | |
47 | if (!__lttng_ust_plibc_dlopen) { | |
48 | __lttng_ust_plibc_dlopen = dlsym(RTLD_NEXT, "dlopen"); | |
49 | if (__lttng_ust_plibc_dlopen == NULL) { | |
50 | fprintf(stderr, "%s\n", dlerror()); | |
51 | return NULL; | |
52 | } | |
53 | } | |
54 | return __lttng_ust_plibc_dlopen(filename, flag); | |
55 | } | |
56 | ||
57 | static | |
58 | int _lttng_ust_dl_libc_dlclose(void *handle) | |
59 | { | |
60 | if (!__lttng_ust_plibc_dlclose) { | |
61 | __lttng_ust_plibc_dlclose = dlsym(RTLD_NEXT, "dlclose"); | |
62 | if (__lttng_ust_plibc_dlclose == NULL) { | |
63 | fprintf(stderr, "%s\n", dlerror()); | |
64 | return -1; | |
65 | } | |
66 | } | |
67 | return __lttng_ust_plibc_dlclose(handle); | |
68 | } | |
69 | ||
70 | static | |
03db42de | 71 | void lttng_ust_dl_dlopen(void *so_base, const char *so_name, void *ip) |
b13d93c2 | 72 | { |
13436238 PW |
73 | char resolved_path[PATH_MAX]; |
74 | struct stat sostat; | |
b13d93c2 | 75 | |
13436238 PW |
76 | if (!realpath(so_name, resolved_path)) { |
77 | ERR("could not resolve path '%s'", so_name); | |
78 | return; | |
b13d93c2 | 79 | } |
b13d93c2 | 80 | |
13436238 PW |
81 | if (stat(resolved_path, &sostat)) { |
82 | ERR("could not access file status for %s", resolved_path); | |
83 | return; | |
b13d93c2 | 84 | } |
13436238 | 85 | |
6d4658aa | 86 | tracepoint(lttng_ust_dl, dlopen, |
03db42de | 87 | so_base, resolved_path, sostat.st_size, sostat.st_mtime, ip); |
13436238 | 88 | return; |
b13d93c2 PW |
89 | } |
90 | ||
91 | void *dlopen(const char *filename, int flag) | |
92 | { | |
93 | void *handle = _lttng_ust_dl_libc_dlopen(filename, flag); | |
bd703713 | 94 | if (__tracepoint_ptrs_registered && handle) { |
b13d93c2 PW |
95 | struct link_map *p = NULL; |
96 | if (dlinfo(handle, RTLD_DI_LINKMAP, &p) != -1 && p != NULL | |
97 | && p->l_addr != 0) | |
03db42de | 98 | lttng_ust_dl_dlopen((void *) p->l_addr, p->l_name, |
82556ac0 | 99 | LTTNG_UST_CALLER_IP()); |
b13d93c2 PW |
100 | } |
101 | return handle; | |
102 | } | |
103 | ||
104 | int dlclose(void *handle) | |
105 | { | |
bd703713 | 106 | if (__tracepoint_ptrs_registered && handle) { |
b13d93c2 PW |
107 | struct link_map *p = NULL; |
108 | if (dlinfo(handle, RTLD_DI_LINKMAP, &p) != -1 && p != NULL | |
109 | && p->l_addr != 0) | |
03db42de | 110 | tracepoint(lttng_ust_dl, dlclose, (void *) p->l_addr, |
82556ac0 | 111 | LTTNG_UST_CALLER_IP()); |
b13d93c2 PW |
112 | } |
113 | return _lttng_ust_dl_libc_dlclose(handle); | |
114 | } |