+++ /dev/null
-/*
- * SPDX-License-Identifier: LGPL-2.1-only
- *
- * Copyright (C) 2013 Paul Woegerer <paul.woegerer@mentor.com>
- * Copyright (C) 2015 Antoine Busque <abusque@efficios.com>
- * Copyright (C) 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- */
-
-#define _LGPL_SOURCE
-#include <limits.h>
-#include <stdio.h>
-#include <stdint.h>
-#include <sys/types.h>
-#include <unistd.h>
-
-#include <ust-dlfcn.h>
-#include <ust-elf.h>
-#include <lttng/ust-events.h>
-#include <ust-helper.h>
-#include "usterr-signal-safe.h"
-
-#include "../liblttng-ust/ust-events-internal.h"
-
-/* Include link.h last else it conflicts with ust-dlfcn. */
-#include <link.h>
-
-#define TRACEPOINT_DEFINE
-#include "ust_dl.h"
-
-static void *(*__lttng_ust_plibc_dlopen)(const char *filename, int flags);
-#ifdef HAVE_DLMOPEN
-static void *(*__lttng_ust_plibc_dlmopen)(Lmid_t nsid, const char *filename,
- int flags);
-#endif
-static int (*__lttng_ust_plibc_dlclose)(void *handle);
-
-static
-void _lttng_ust_dl_init(void)
- __attribute__((constructor));
-static
-void _lttng_ust_dl_init(void)
-{
- ust_err_init();
-}
-
-static
-void *_lttng_ust_dl_libc_dlopen(const char *filename, int flags)
-{
- if (!__lttng_ust_plibc_dlopen) {
- __lttng_ust_plibc_dlopen = dlsym(RTLD_NEXT, "dlopen");
- if (!__lttng_ust_plibc_dlopen) {
- fprintf(stderr, "%s\n", dlerror());
- return NULL;
- }
- }
- return __lttng_ust_plibc_dlopen(filename, flags);
-}
-
-#ifdef HAVE_DLMOPEN
-static
-void *_lttng_ust_dl_libc_dlmopen(Lmid_t nsid, const char *filename,
- int flags)
-{
- if (!__lttng_ust_plibc_dlmopen) {
- __lttng_ust_plibc_dlmopen = dlsym(RTLD_NEXT, "dlmopen");
- if (!__lttng_ust_plibc_dlmopen) {
- fprintf(stderr, "%s\n", dlerror());
- return NULL;
- }
- }
- return __lttng_ust_plibc_dlmopen(nsid, filename, flags);
-}
-#endif
-
-static
-int _lttng_ust_dl_libc_dlclose(void *handle)
-{
- if (!__lttng_ust_plibc_dlclose) {
- __lttng_ust_plibc_dlclose = dlsym(RTLD_NEXT, "dlclose");
- if (!__lttng_ust_plibc_dlclose) {
- fprintf(stderr, "%s\n", dlerror());
- return -1;
- }
- }
- return __lttng_ust_plibc_dlclose(handle);
-}
-
-static
-void lttng_ust_dl_dlopen(void *so_base, const char *so_name,
- int flags, void *ip)
-{
- char resolved_path[PATH_MAX];
- struct lttng_ust_elf *elf;
- uint64_t memsz;
- uint8_t *build_id = NULL;
- size_t build_id_len;
- char *dbg_file = NULL;
- uint32_t crc;
- int has_build_id = 0, has_debug_link = 0;
- int ret;
-
- if (!realpath(so_name, resolved_path)) {
- ERR("could not resolve path '%s'", so_name);
- return;
- }
-
- elf = lttng_ust_elf_create(resolved_path);
- if (!elf) {
- ERR("could not access file %s", resolved_path);
- return;
- }
-
- ret = lttng_ust_elf_get_memsz(elf, &memsz);
- if (ret) {
- goto end;
- }
- ret = lttng_ust_elf_get_build_id(
- elf, &build_id, &build_id_len, &has_build_id);
- if (ret) {
- goto end;
- }
- ret = lttng_ust_elf_get_debug_link(
- elf, &dbg_file, &crc, &has_debug_link);
- if (ret) {
- goto end;
- }
-
- tracepoint(lttng_ust_dl, dlopen,
- ip, so_base, resolved_path, flags, memsz,
- has_build_id, has_debug_link);
-
- if (has_build_id) {
- tracepoint(lttng_ust_dl, build_id,
- ip, so_base, build_id, build_id_len);
- }
-
- if (has_debug_link) {
- tracepoint(lttng_ust_dl, debug_link,
- ip, so_base, dbg_file, crc);
- }
-
-end:
- free(dbg_file);
- free(build_id);
- lttng_ust_elf_destroy(elf);
- return;
-}
-
-#ifdef HAVE_DLMOPEN
-static
-void lttng_ust_dl_dlmopen(void *so_base, Lmid_t nsid, const char *so_name,
- int flags, void *ip)
-{
- char resolved_path[PATH_MAX];
- struct lttng_ust_elf *elf;
- uint64_t memsz;
- uint8_t *build_id = NULL;
- size_t build_id_len;
- char *dbg_file = NULL;
- uint32_t crc;
- int has_build_id = 0, has_debug_link = 0;
- int ret;
-
- if (!realpath(so_name, resolved_path)) {
- ERR("could not resolve path '%s'", so_name);
- return;
- }
-
- elf = lttng_ust_elf_create(resolved_path);
- if (!elf) {
- ERR("could not access file %s", resolved_path);
- return;
- }
-
- ret = lttng_ust_elf_get_memsz(elf, &memsz);
- if (ret) {
- goto end;
- }
- ret = lttng_ust_elf_get_build_id(
- elf, &build_id, &build_id_len, &has_build_id);
- if (ret) {
- goto end;
- }
- ret = lttng_ust_elf_get_debug_link(
- elf, &dbg_file, &crc, &has_debug_link);
- if (ret) {
- goto end;
- }
-
- tracepoint(lttng_ust_dl, dlmopen,
- ip, so_base, nsid, resolved_path, flags, memsz,
- has_build_id, has_debug_link);
-
- if (has_build_id) {
- tracepoint(lttng_ust_dl, build_id,
- ip, so_base, build_id, build_id_len);
- }
-
- if (has_debug_link) {
- tracepoint(lttng_ust_dl, debug_link,
- ip, so_base, dbg_file, crc);
- }
-
-end:
- free(dbg_file);
- free(build_id);
- lttng_ust_elf_destroy(elf);
- return;
-}
-#endif
-
-void *dlopen(const char *filename, int flags)
-{
- void *handle;
-
- handle = _lttng_ust_dl_libc_dlopen(filename, flags);
- if (__tracepoint_ptrs_registered && handle) {
- struct link_map *p = NULL;
- int ret;
-
- ret = dlinfo(handle, RTLD_DI_LINKMAP, &p);
- if (ret != -1 && p != NULL && p->l_addr != 0) {
- lttng_ust_dl_dlopen((void *) p->l_addr,
- p->l_name, flags, LTTNG_UST_CALLER_IP());
- }
- }
- lttng_ust_dl_update(LTTNG_UST_CALLER_IP());
- return handle;
-}
-
-#ifdef HAVE_DLMOPEN
-void *dlmopen(Lmid_t nsid, const char *filename, int flags)
-{
- void *handle;
-
- handle = _lttng_ust_dl_libc_dlmopen(nsid, filename, flags);
- if (__tracepoint_ptrs_registered && handle) {
- struct link_map *p = NULL;
- int ret;
-
- ret = dlinfo(handle, RTLD_DI_LINKMAP, &p);
- if (ret != -1 && p != NULL && p->l_addr != 0) {
- lttng_ust_dl_dlmopen((void *) p->l_addr,
- nsid, p->l_name, flags,
- LTTNG_UST_CALLER_IP());
- }
- }
- lttng_ust_dl_update(LTTNG_UST_CALLER_IP());
- return handle;
-
-}
-#endif
-
-int dlclose(void *handle)
-{
- int ret;
-
- if (__tracepoint_ptrs_registered) {
- struct link_map *p = NULL;
-
- ret = dlinfo(handle, RTLD_DI_LINKMAP, &p);
- if (ret != -1 && p != NULL && p->l_addr != 0) {
- tracepoint(lttng_ust_dl, dlclose,
- LTTNG_UST_CALLER_IP(),
- (void *) p->l_addr);
- }
- }
- ret = _lttng_ust_dl_libc_dlclose(handle);
- lttng_ust_dl_update(LTTNG_UST_CALLER_IP());
- return ret;
-}
projects / lttng-ust.git / blobdiff