X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=liblttng-ust%2Flttng-ust-statedump.c;h=040223d58409bd93b2ceedb9d8d8979e463beac1;hb=HEAD;hp=93a035b35a0ead7032e2ae121d8168f5c624c6da;hpb=d34e6761379227cfd49abb6eab184e1e254ee0b2;p=lttng-ust.git diff --git a/liblttng-ust/lttng-ust-statedump.c b/liblttng-ust/lttng-ust-statedump.c deleted file mode 100644 index 93a035b3..00000000 --- a/liblttng-ust/lttng-ust-statedump.c +++ /dev/null @@ -1,343 +0,0 @@ -/* - * Copyright (C) 2013 Paul Woegerer - * Copyright (C) 2015 Antoine Busque - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#define _LGPL_SOURCE -#define _GNU_SOURCE - -#include -#include -#include -#include -#include -#include -#include - -#include -#include "lttng-tracer-core.h" -#include "lttng-ust-statedump.h" - -#define TRACEPOINT_DEFINE -#define TRACEPOINT_CREATE_PROBES -#define TP_SESSION_CHECK -#include "lttng-ust-statedump-provider.h" - -struct dl_iterate_data { - void *owner; - int exec_found; -}; - -struct soinfo_data { - void *owner; - void *base_addr_ptr; - const char *resolved_path; - char *dbg_file; - uint8_t *build_id; - uint64_t memsz; - size_t build_id_len; - int vdso; - uint32_t crc; -}; - -typedef void (*tracepoint_cb)(struct lttng_session *session, void *priv); - -/* - * Trace statedump event into all sessions owned by the caller thread - * for which statedump is pending. - */ -static -int trace_statedump_event(tracepoint_cb tp_cb, void *owner, void *priv) -{ - struct cds_list_head *sessionsp; - struct lttng_session *session; - - sessionsp = _lttng_get_sessions(); - cds_list_for_each_entry(session, sessionsp, node) { - if (session->owner != owner) - continue; - if (!session->statedump_pending) - continue; - tp_cb(session, priv); - } - return 0; -} - -static -void trace_soinfo_cb(struct lttng_session *session, void *priv) -{ - struct soinfo_data *so_data = (struct soinfo_data *) priv; - - tracepoint(lttng_ust_statedump, soinfo, - session, so_data->base_addr_ptr, - so_data->resolved_path, so_data->memsz); -} - -static -void trace_build_id_cb(struct lttng_session *session, void *priv) -{ - struct soinfo_data *so_data = (struct soinfo_data *) priv; - - tracepoint(lttng_ust_statedump, build_id, - session, so_data->base_addr_ptr, - so_data->build_id, so_data->build_id_len); -} - -static -void trace_debug_link_cb(struct lttng_session *session, void *priv) -{ - struct soinfo_data *so_data = (struct soinfo_data *) priv; - - tracepoint(lttng_ust_statedump, debug_link, - session, so_data->base_addr_ptr, - so_data->dbg_file, so_data->crc); -} - -static -void trace_start_cb(struct lttng_session *session, void *priv) -{ - tracepoint(lttng_ust_statedump, start, session); -} - -static -void trace_end_cb(struct lttng_session *session, void *priv) -{ - tracepoint(lttng_ust_statedump, end, session); -} - -static -int get_elf_info(struct soinfo_data *so_data, int *has_build_id, - int *has_debug_link) { - struct lttng_ust_elf *elf; - int ret = 0; - - elf = lttng_ust_elf_create(so_data->resolved_path); - if (!elf) { - ret = -1; - goto end; - } - - ret = lttng_ust_elf_get_memsz(elf, &so_data->memsz); - if (ret) { - goto end; - } - - ret = lttng_ust_elf_get_build_id(elf, &so_data->build_id, - &so_data->build_id_len, has_build_id); - if (ret) { - goto end; - } - ret = lttng_ust_elf_get_debug_link(elf, &so_data->dbg_file, - &so_data->crc, has_debug_link); - if (ret) { - goto end; - } - -end: - lttng_ust_elf_destroy(elf); - return ret; -} - -static -int trace_baddr(struct soinfo_data *so_data) -{ - int ret = 0, has_build_id = 0, has_debug_link = 0; - - if (!so_data->vdso) { - ret = get_elf_info(so_data, &has_build_id, &has_debug_link); - if (ret) { - goto end; - } - } else { - so_data->memsz = 0; - } - - ret = trace_statedump_event(trace_soinfo_cb, so_data->owner, so_data); - if (ret) { - goto end; - } - - if (has_build_id) { - ret = trace_statedump_event( - trace_build_id_cb, so_data->owner, so_data); - free(so_data->build_id); - if (ret) { - goto end; - } - } - - if (has_debug_link) { - ret = trace_statedump_event( - trace_debug_link_cb, so_data->owner, so_data); - free(so_data->dbg_file); - if (ret) { - goto end; - } - } - -end: - return ret; -} - -static -int trace_statedump_start(void *owner) -{ - return trace_statedump_event(trace_start_cb, owner, NULL); -} - -static -int trace_statedump_end(void *owner) -{ - return trace_statedump_event(trace_end_cb, owner, NULL); -} - -static -int extract_soinfo_events(struct dl_phdr_info *info, size_t size, void *_data) -{ - int j, ret = 0; - struct dl_iterate_data *data = _data; - - /* - * UST lock nests within dynamic loader lock. - * - * Hold this lock across handling of the entire module to - * protect memory allocation at early process start, due to - * interactions with libc-wrapper lttng malloc instrumentation. - */ - if (ust_lock()) { - goto end; - } - - for (j = 0; j < info->dlpi_phnum; j++) { - struct soinfo_data so_data; - char resolved_path[PATH_MAX]; - void *base_addr_ptr; - - if (info->dlpi_phdr[j].p_type != PT_LOAD) - continue; - - /* Calculate virtual memory address of the loadable segment */ - base_addr_ptr = (void *) info->dlpi_addr + - info->dlpi_phdr[j].p_vaddr; - - if ((info->dlpi_name == NULL || info->dlpi_name[0] == 0)) { - /* - * Only the first phdr without a dlpi_name - * encountered is considered as the program - * executable. The rest are vdsos. - */ - if (!data->exec_found) { - ssize_t path_len; - data->exec_found = 1; - - /* - * Use /proc/self/exe to resolve the - * executable's full path. - */ - path_len = readlink("/proc/self/exe", - resolved_path, - PATH_MAX - 1); - if (path_len <= 0) - break; - - resolved_path[path_len] = '\0'; - so_data.vdso = 0; - } else { - snprintf(resolved_path, PATH_MAX - 1, "[vdso]"); - so_data.vdso = 1; - } - } else { - /* - * For regular dl_phdr_info entries check if - * the path to the SO really exists. If not, - * treat as vdso and use dlpi_name as 'path'. - */ - if (!realpath(info->dlpi_name, resolved_path)) { - snprintf(resolved_path, PATH_MAX - 1, "[%s]", - info->dlpi_name); - so_data.vdso = 1; - } else { - so_data.vdso = 0; - } - } - - so_data.owner = data->owner; - so_data.base_addr_ptr = base_addr_ptr; - so_data.resolved_path = resolved_path; - ret = trace_baddr(&so_data); - break; - } -end: - ust_unlock(); - return ret; -} - -/* - * Generate a statedump of base addresses of all shared objects loaded - * by the traced application, as well as for the application's - * executable itself. - */ -static -int do_baddr_statedump(void *owner) -{ - struct dl_iterate_data data; - - if (getenv("LTTNG_UST_WITHOUT_BADDR_STATEDUMP")) - return 0; - - data.owner = owner; - data.exec_found = 0; - /* - * Iterate through the list of currently loaded shared objects and - * generate events for loadable segments using - * extract_soinfo_events. - */ - dl_iterate_phdr(extract_soinfo_events, &data); - - return 0; -} - -/* - * Generate a statedump of a given traced application. A statedump is - * delimited by start and end events. For a given (process, session) - * pair, begin/end events are serialized and will match. However, in a - * session, statedumps from different processes may be - * interleaved. The vpid context should be used to identify which - * events belong to which process. - */ -int do_lttng_ust_statedump(void *owner) -{ - trace_statedump_start(owner); - do_baddr_statedump(owner); - trace_statedump_end(owner); - - return 0; -} - -void lttng_ust_statedump_init(void) -{ - __tracepoints__init(); - __tracepoints__ptrs_init(); - __lttng_events_init__lttng_ust_statedump(); -} - -void lttng_ust_statedump_destroy(void) -{ - __lttng_events_exit__lttng_ust_statedump(); - __tracepoints__ptrs_destroy(); - __tracepoints__destroy(); -}