| 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 | |
| 19 | #define _LGPL_SOURCE |
| 20 | #define _GNU_SOURCE |
| 21 | #include <lttng/ust-dlfcn.h> |
| 22 | #include <inttypes.h> |
| 23 | #include <link.h> |
| 24 | #include <unistd.h> |
| 25 | #include <stdio.h> |
| 26 | #include <limits.h> |
| 27 | #include <sys/types.h> |
| 28 | #include <sys/stat.h> |
| 29 | #include <signal.h> |
| 30 | #include <sched.h> |
| 31 | #include <stdarg.h> |
| 32 | #include "usterr.h" |
| 33 | |
| 34 | #include <lttng/ust-compiler.h> |
| 35 | #include <lttng/ust.h> |
| 36 | |
| 37 | #define TRACEPOINT_DEFINE |
| 38 | #include "ust_baddr.h" |
| 39 | |
| 40 | static void *(*__lttng_ust_plibc_dlopen)(const char *filename, int flag); |
| 41 | static int (*__lttng_ust_plibc_dlclose)(void *handle); |
| 42 | |
| 43 | static |
| 44 | void *_lttng_ust_dl_libc_dlopen(const char *filename, int flag) |
| 45 | { |
| 46 | if (!__lttng_ust_plibc_dlopen) { |
| 47 | __lttng_ust_plibc_dlopen = dlsym(RTLD_NEXT, "dlopen"); |
| 48 | if (__lttng_ust_plibc_dlopen == NULL) { |
| 49 | fprintf(stderr, "%s\n", dlerror()); |
| 50 | return NULL; |
| 51 | } |
| 52 | } |
| 53 | return __lttng_ust_plibc_dlopen(filename, flag); |
| 54 | } |
| 55 | |
| 56 | static |
| 57 | int _lttng_ust_dl_libc_dlclose(void *handle) |
| 58 | { |
| 59 | if (!__lttng_ust_plibc_dlclose) { |
| 60 | __lttng_ust_plibc_dlclose = dlsym(RTLD_NEXT, "dlclose"); |
| 61 | if (__lttng_ust_plibc_dlclose == NULL) { |
| 62 | fprintf(stderr, "%s\n", dlerror()); |
| 63 | return -1; |
| 64 | } |
| 65 | } |
| 66 | return __lttng_ust_plibc_dlclose(handle); |
| 67 | } |
| 68 | |
| 69 | static |
| 70 | void lttng_ust_baddr_push(void *so_base, const char *so_name) |
| 71 | { |
| 72 | char resolved_path[PATH_MAX]; |
| 73 | struct stat sostat; |
| 74 | |
| 75 | if (!realpath(so_name, resolved_path)) { |
| 76 | ERR("could not resolve path '%s'", so_name); |
| 77 | return; |
| 78 | } |
| 79 | |
| 80 | if (stat(resolved_path, &sostat)) { |
| 81 | ERR("could not access file status for %s", resolved_path); |
| 82 | return; |
| 83 | } |
| 84 | |
| 85 | tracepoint(ust_baddr, push, |
| 86 | so_base, resolved_path, sostat.st_size, sostat.st_mtime); |
| 87 | return; |
| 88 | } |
| 89 | |
| 90 | void *dlopen(const char *filename, int flag) |
| 91 | { |
| 92 | void *handle = _lttng_ust_dl_libc_dlopen(filename, flag); |
| 93 | if (__tracepoint_ptrs_registered && handle) { |
| 94 | struct link_map *p = NULL; |
| 95 | if (dlinfo(handle, RTLD_DI_LINKMAP, &p) != -1 && p != NULL |
| 96 | && p->l_addr != 0) |
| 97 | lttng_ust_baddr_push((void *) p->l_addr, p->l_name); |
| 98 | } |
| 99 | return handle; |
| 100 | } |
| 101 | |
| 102 | int dlclose(void *handle) |
| 103 | { |
| 104 | if (__tracepoint_ptrs_registered && handle) { |
| 105 | struct link_map *p = NULL; |
| 106 | if (dlinfo(handle, RTLD_DI_LINKMAP, &p) != -1 && p != NULL |
| 107 | && p->l_addr != 0) |
| 108 | tracepoint(ust_baddr, pop, (void *) p->l_addr); |
| 109 | } |
| 110 | return _lttng_ust_dl_libc_dlclose(handle); |
| 111 | } |