X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Flib%2Flttng-ctl%2Flttng-ctl.c;h=9e709c1b6e4157f9072838d3fdbc8f779ed63cda;hp=03b74c0b74771a9d0be8158f152a617123799c47;hb=e848d36d1b0e7cbe1800e195fb00eaff6bce4d5e;hpb=2001793c1141e89b34e70efb28b27ec0cc8e6d47 diff --git a/src/lib/lttng-ctl/lttng-ctl.c b/src/lib/lttng-ctl/lttng-ctl.c index 03b74c0b7..9e709c1b6 100644 --- a/src/lib/lttng-ctl/lttng-ctl.c +++ b/src/lib/lttng-ctl/lttng-ctl.c @@ -1,5 +1,5 @@ /* - * liblttngctl.c + * lttng-ctl.c * * Linux Trace Toolkit Control Library * @@ -30,12 +30,22 @@ #include #include +#include #include #include #include #include +#include #include #include +#include +#include +#include +#include +#include +#include +#include +#include #include "filter/filter-ast.h" #include "filter/filter-parser.h" @@ -59,7 +69,7 @@ do { \ /* Socket to session daemon for communication */ -static int sessiond_socket; +static int sessiond_socket = -1; static char sessiond_sock_path[PATH_MAX]; /* Variables */ @@ -150,7 +160,7 @@ end: * On success, returns the number of bytes sent (>=0) * On error, returns -1 */ -static int send_session_varlen(void *data, size_t len) +static int send_session_varlen(const void *data, size_t len) { int ret; @@ -173,6 +183,35 @@ end: return ret; } +/* + * Send file descriptors to the session daemon. + * + * On success, returns the number of bytes sent (>=0) + * On error, returns -1 + */ +static int send_session_fds(const int *fds, size_t nb_fd) +{ + int ret; + + if (!connected) { + ret = -LTTNG_ERR_NO_SESSIOND; + goto end; + } + + if (!fds || !nb_fd) { + ret = 0; + goto end; + } + + ret = lttcomm_send_fds_unix_sock(sessiond_socket, fds, nb_fd); + if (ret < 0) { + ret = -LTTNG_ERR_FATAL; + } + +end: + return ret; +} + /* * Receive data from the sessiond socket. * @@ -205,15 +244,13 @@ end: LTTNG_HIDDEN int lttng_check_tracing_group(void) { - struct group *grp_tracing; /* no free(). See getgrnam(3) */ - gid_t *grp_list; + gid_t *grp_list, tracing_gid; int grp_list_size, grp_id, i; int ret = -1; const char *grp_name = tracing_group; /* Get GID of group 'tracing' */ - grp_tracing = getgrnam(grp_name); - if (!grp_tracing) { + if (utils_get_group_id(grp_name, false, &tracing_gid)) { /* If grp_tracing is NULL, the group does not exist. */ goto end; } @@ -238,7 +275,7 @@ int lttng_check_tracing_group(void) } for (i = 0; i < grp_list_size; i++) { - if (grp_list[i] == grp_tracing->gr_gid) { + if (grp_list[i] == tracing_gid) { ret = 1; break; } @@ -251,6 +288,50 @@ end: return ret; } +static int check_enough_available_memory(size_t num_bytes_requested_per_cpu) +{ + int ret; + long num_cpu; + size_t best_mem_info; + size_t num_bytes_requested_total; + + /* + * Get the number of CPU currently online to compute the amount of + * memory needed to create a buffer for every CPU. + */ + num_cpu = sysconf(_SC_NPROCESSORS_ONLN); + if (num_cpu == -1) { + goto error; + } + + num_bytes_requested_total = num_bytes_requested_per_cpu * num_cpu; + + /* + * Try to get the `MemAvail` field of `/proc/meminfo`. This is the most + * reliable estimate we can get but it is only exposed by the kernel + * since 3.14. (See Linux kernel commit: + * 34e431b0ae398fc54ea69ff85ec700722c9da773) + */ + ret = utils_get_memory_available(&best_mem_info); + if (ret >= 0) { + goto success; + } + + /* + * As a backup plan, use `MemTotal` field of `/proc/meminfo`. This + * is a sanity check for obvious user error. + */ + ret = utils_get_memory_total(&best_mem_info); + if (ret >= 0) { + goto success; + } + +error: + return -1; +success: + return best_mem_info >= num_bytes_requested_total; +} + /* * Try connect to session daemon with sock_path. * @@ -343,17 +424,12 @@ error: /* * Connect to the LTTng session daemon. * - * On success, return 0. On error, return -1. + * On success, return the socket's file descriptor. On error, return -1. */ -static int connect_sessiond(void) +LTTNG_HIDDEN int connect_sessiond(void) { int ret; - /* Don't try to connect if already connected. */ - if (connected) { - return 0; - } - ret = set_session_daemon_path(); if (ret < 0) { goto error; @@ -365,15 +441,18 @@ static int connect_sessiond(void) goto error; } - sessiond_socket = ret; - connected = 1; - - return 0; + return ret; error: return -1; } +static void reset_global_sessiond_connection_state(void) +{ + sessiond_socket = -1; + connected = 0; +} + /* * Clean disconnect from the session daemon. * @@ -385,32 +464,84 @@ static int disconnect_sessiond(void) if (connected) { ret = lttcomm_close_unix_sock(sessiond_socket); - sessiond_socket = 0; - connected = 0; + reset_global_sessiond_connection_state(); + } + + return ret; +} + +static int recv_sessiond_optional_data(size_t len, void **user_buf, + size_t *user_len) +{ + int ret = 0; + void *buf = NULL; + + if (len) { + if (!user_len) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + + buf = zmalloc(len); + if (!buf) { + ret = -ENOMEM; + goto end; + } + + ret = recv_data_sessiond(buf, len); + if (ret < 0) { + goto end; + } + + if (!user_buf) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + + /* Move ownership of command header buffer to user. */ + *user_buf = buf; + buf = NULL; + *user_len = len; + } else { + /* No command header. */ + if (user_len) { + *user_len = 0; + } + + if (user_buf) { + *user_buf = NULL; + } } +end: + free(buf); return ret; } /* * Ask the session daemon a specific command and put the data into buf. - * Takes extra var. len. data as input to send to the session daemon. + * Takes extra var. len. data and file descriptors as input to send to the + * session daemon. * * Return size of data (only payload, not header) or a negative error code. */ LTTNG_HIDDEN -int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm, - void *vardata, size_t varlen, void **buf) +int lttng_ctl_ask_sessiond_fds_varlen(struct lttcomm_session_msg *lsm, + const int *fds, size_t nb_fd, const void *vardata, + size_t vardata_len, void **user_payload_buf, + void **user_cmd_header_buf, size_t *user_cmd_header_len) { int ret; - size_t size; - void *data = NULL; + size_t payload_len; struct lttcomm_lttng_msg llm; ret = connect_sessiond(); if (ret < 0) { ret = -LTTNG_ERR_NO_SESSIOND; goto end; + } else { + sessiond_socket = ret; + connected = 1; } /* Send command to session daemon */ @@ -420,7 +551,14 @@ int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm, goto end; } /* Send var len data */ - ret = send_session_varlen(vardata, varlen); + ret = send_session_varlen(vardata, vardata_len); + if (ret < 0) { + /* Ret value is a valid lttng error code. */ + goto end; + } + + /* Send fds */ + ret = send_session_fds(fds, nb_fd); if (ret < 0) { /* Ret value is a valid lttng error code. */ goto end; @@ -439,41 +577,21 @@ int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm, goto end; } - size = llm.data_size; - if (size == 0) { - /* If client free with size 0 */ - if (buf != NULL) { - *buf = NULL; - } - ret = 0; - goto end; - } - - data = zmalloc(size); - if (!data) { - ret = -ENOMEM; - goto end; - } - - /* Get payload data */ - ret = recv_data_sessiond(data, size); + /* Get command header from data transmission */ + ret = recv_sessiond_optional_data(llm.cmd_header_size, + user_cmd_header_buf, user_cmd_header_len); if (ret < 0) { - free(data); goto end; } - /* - * Extra protection not to dereference a NULL pointer. If buf is NULL at - * this point, an error is returned and data is freed. - */ - if (buf == NULL) { - ret = -LTTNG_ERR_INVALID; - free(data); + /* Get payload from data transmission */ + ret = recv_sessiond_optional_data(llm.data_size, user_payload_buf, + &payload_len); + if (ret < 0) { goto end; } - *buf = data; - ret = size; + ret = llm.data_size; end: disconnect_sessiond(); @@ -490,10 +608,6 @@ struct lttng_handle *lttng_create_handle(const char *session_name, { struct lttng_handle *handle = NULL; - if (domain == NULL) { - goto end; - } - handle = zmalloc(sizeof(struct lttng_handle)); if (handle == NULL) { PERROR("malloc handle"); @@ -504,8 +618,10 @@ struct lttng_handle *lttng_create_handle(const char *session_name, lttng_ctl_copy_string(handle->session_name, session_name, sizeof(handle->session_name)); - /* Copy lttng domain */ - lttng_ctl_copy_lttng_domain(&handle->domain, domain); + /* Copy lttng domain or leave initialized to 0. */ + if (domain) { + lttng_ctl_copy_lttng_domain(&handle->domain, domain); + } end: return handle; @@ -608,7 +724,7 @@ static int _lttng_stop_tracing(const char *session_name, int wait) * call returned value indicates availability. */ if (data_ret) { - usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME); + usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US); } } while (data_ret != 0); @@ -707,11 +823,18 @@ int lttng_add_context(struct lttng_handle *handle, memcpy(buf + provider_len, ctx_name, ctx_len); } memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context)); - /* Don't leak application addresses to the sessiond. */ - lsm.u.context.ctx.u.app_ctx.provider_name = NULL; - lsm.u.context.ctx.u.app_ctx.ctx_name = NULL; - ret = lttng_ctl_ask_sessiond_varlen(&lsm, buf, len, NULL); + if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { + /* + * Don't leak application addresses to the sessiond. + * This is only necessary when ctx is for an app ctx otherwise + * the values inside the union (type & config) are overwritten. + */ + lsm.u.context.ctx.u.app_ctx.provider_name = NULL; + lsm.u.context.ctx.u.app_ctx.ctx_name = NULL; + } + + ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, buf, len, NULL); end: free(buf); return ret; @@ -760,7 +883,7 @@ static char *set_agent_filter(const char *filter, struct lttng_event *ev) assert(ev); /* Don't add filter for the '*' event. */ - if (ev->name[0] != '*') { + if (strcmp(ev->name, "*") != 0) { if (filter) { err = asprintf(&agent_filter, "(%s) && (logger_name == \"%s\")", filter, ev->name); @@ -850,12 +973,6 @@ static int generate_filter(char *filter_expression, ret = -LTTNG_ERR_FILTER_INVAL; goto parse_error; } - ret = filter_visitor_set_parent(ctx); - if (ret) { - fprintf(stderr, "Set parent error\n"); - ret = -LTTNG_ERR_FILTER_INVAL; - goto parse_error; - } if (print_xml) { ret = filter_visitor_print_xml(ctx, stdout, 0); if (ret) { @@ -883,12 +1000,28 @@ static int generate_filter(char *filter_expression, ret = -LTTNG_ERR_FILTER_INVAL; goto parse_error; } + + /* Normalize globbing patterns in the expression. */ + ret = filter_visitor_ir_normalize_glob_patterns(ctx); + if (ret) { + ret = -LTTNG_ERR_FILTER_INVAL; + goto parse_error; + } + /* Validate strings used as literals in the expression. */ ret = filter_visitor_ir_validate_string(ctx); if (ret) { ret = -LTTNG_ERR_FILTER_INVAL; goto parse_error; } + + /* Validate globbing patterns in the expression. */ + ret = filter_visitor_ir_validate_globbing(ctx); + if (ret) { + ret = -LTTNG_ERR_FILTER_INVAL; + goto parse_error; + } + dbg_printf("done\n"); dbg_printf("Generating bytecode... "); @@ -940,10 +1073,18 @@ int lttng_enable_event_with_exclusions(struct lttng_handle *handle, int exclusion_count, char **exclusion_list) { struct lttcomm_session_msg lsm; - char *varlen_data; - int ret = 0; + struct lttng_dynamic_buffer send_buffer; + int ret = 0, i, fd_to_send = -1; + bool send_fd = false; unsigned int free_filter_expression = 0; struct filter_parser_ctx *ctx = NULL; + + /* + * We have either a filter or some exclusions, so we need to set up + * a variable-length memory block from where to send the data. + */ + lttng_dynamic_buffer_init(&send_buffer); + /* * Cast as non-const since we may replace the filter expression * by a dynamically allocated string. Otherwise, the original @@ -992,23 +1133,6 @@ int lttng_enable_event_with_exclusions(struct lttng_handle *handle, lsm.u.enable.exclusion_count = exclusion_count; lsm.u.enable.bytecode_len = 0; - /* - * For the JUL domain, a filter is enforced except for the enable all - * event. This is done to avoid having the event in all sessions thus - * filtering by logger name. - */ - if (exclusion_count == 0 && filter_expression == NULL && - (handle->domain.type != LTTNG_DOMAIN_JUL && - handle->domain.type != LTTNG_DOMAIN_LOG4J && - handle->domain.type != LTTNG_DOMAIN_PYTHON)) { - goto ask_sessiond; - } - - /* - * We have either a filter or some exclusions, so we need to set up - * a variable-length memory block from where to send the data. - */ - /* Parse filter expression. */ if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL || handle->domain.type == LTTNG_DOMAIN_LOG4J @@ -1045,41 +1169,82 @@ int lttng_enable_event_with_exclusions(struct lttng_handle *handle, } } - varlen_data = zmalloc(lsm.u.enable.bytecode_len + ret = lttng_dynamic_buffer_set_capacity(&send_buffer, + lsm.u.enable.bytecode_len + lsm.u.enable.expression_len + LTTNG_SYMBOL_NAME_LEN * exclusion_count); - if (!varlen_data) { + if (ret) { ret = -LTTNG_ERR_EXCLUSION_NOMEM; goto mem_error; } /* Put exclusion names first in the data. */ - while (exclusion_count--) { - strncpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * exclusion_count, - *(exclusion_list + exclusion_count), - LTTNG_SYMBOL_NAME_LEN - 1); + for (i = 0; i < exclusion_count; i++) { + size_t exclusion_len; + + exclusion_len = lttng_strnlen(*(exclusion_list + i), + LTTNG_SYMBOL_NAME_LEN); + if (exclusion_len == LTTNG_SYMBOL_NAME_LEN) { + /* Exclusion is not NULL-terminated. */ + ret = -LTTNG_ERR_INVALID; + goto mem_error; + } + + ret = lttng_dynamic_buffer_append(&send_buffer, + *(exclusion_list + i), + LTTNG_SYMBOL_NAME_LEN); + if (ret) { + goto mem_error; + } } + /* Add filter expression next. */ - if (lsm.u.enable.expression_len != 0) { - memcpy(varlen_data - + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count, - filter_expression, - lsm.u.enable.expression_len); + if (filter_expression) { + ret = lttng_dynamic_buffer_append(&send_buffer, + filter_expression, lsm.u.enable.expression_len); + if (ret) { + goto mem_error; + } } /* Add filter bytecode next. */ if (ctx && lsm.u.enable.bytecode_len != 0) { - memcpy(varlen_data - + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count - + lsm.u.enable.expression_len, - &ctx->bytecode->b, - lsm.u.enable.bytecode_len); + ret = lttng_dynamic_buffer_append(&send_buffer, + &ctx->bytecode->b, lsm.u.enable.bytecode_len); + if (ret) { + goto mem_error; + } } + if (ev->extended.ptr) { + struct lttng_event_extended *ev_ext = + (struct lttng_event_extended *) ev->extended.ptr; + + if (ev_ext->probe_location) { + /* + * lttng_userspace_probe_location_serialize returns the + * number of bytes that was appended to the buffer. + */ + ret = lttng_userspace_probe_location_serialize( + ev_ext->probe_location, &send_buffer, + &fd_to_send); + if (ret < 0) { + goto mem_error; + } - ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data, - (LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count) + - lsm.u.enable.bytecode_len + lsm.u.enable.expression_len, - NULL); - free(varlen_data); + send_fd = fd_to_send >= 0; + /* + * Set the size of the userspace probe location element + * of the buffer so that the receiving side knows where + * to split it. + */ + lsm.u.enable.userspace_probe_location_len = ret; + } + } + + ret = lttng_ctl_ask_sessiond_fds_varlen(&lsm, + send_fd ? &fd_to_send : NULL, + send_fd ? 1 : 0, + send_buffer.size ? send_buffer.data : NULL, + send_buffer.size, NULL, NULL, 0); mem_error: if (filter_expression && ctx) { @@ -1101,6 +1266,7 @@ error: * Return directly to the caller and don't ask the sessiond since * something went wrong in the parsing of data above. */ + lttng_dynamic_buffer_reset(&send_buffer); return ret; ask_sessiond: @@ -1234,7 +1400,7 @@ int lttng_disable_event_ext(struct lttng_handle *handle, lsm.u.disable.bytecode_len); } - ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data, + ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, varlen_data, lsm.u.disable.bytecode_len + lsm.u.disable.expression_len, NULL); free(varlen_data); @@ -1283,26 +1449,122 @@ int lttng_disable_event(struct lttng_handle *handle, const char *name, return lttng_disable_event_ext(handle, &ev, channel_name, NULL); } +struct lttng_channel *lttng_channel_create(struct lttng_domain *domain) +{ + struct lttng_channel *channel = NULL; + struct lttng_channel_extended *extended = NULL; + + if (!domain) { + goto error; + } + + /* Validate domain. */ + switch (domain->type) { + case LTTNG_DOMAIN_UST: + switch (domain->buf_type) { + case LTTNG_BUFFER_PER_UID: + case LTTNG_BUFFER_PER_PID: + break; + default: + goto error; + } + break; + case LTTNG_DOMAIN_KERNEL: + if (domain->buf_type != LTTNG_BUFFER_GLOBAL) { + goto error; + } + break; + default: + goto error; + } + + channel = zmalloc(sizeof(*channel)); + if (!channel) { + goto error; + } + + extended = zmalloc(sizeof(*extended)); + if (!extended) { + goto error; + } + + channel->attr.extended.ptr = extended; + + lttng_channel_set_default_attr(domain, &channel->attr); + return channel; +error: + free(channel); + free(extended); + return NULL; +} + +void lttng_channel_destroy(struct lttng_channel *channel) +{ + if (!channel) { + return; + } + + if (channel->attr.extended.ptr) { + free(channel->attr.extended.ptr); + } + free(channel); +} + /* * Enable channel per domain * Returns size of returned session payload data or a negative error code. */ int lttng_enable_channel(struct lttng_handle *handle, - struct lttng_channel *chan) + struct lttng_channel *in_chan) { struct lttcomm_session_msg lsm; + size_t total_buffer_size_needed_per_cpu = 0; /* NULL arguments are forbidden. No default values. */ - if (handle == NULL || chan == NULL) { + if (handle == NULL || in_chan == NULL) { return -LTTNG_ERR_INVALID; } memset(&lsm, 0, sizeof(lsm)); + memcpy(&lsm.u.channel.chan, in_chan, sizeof(lsm.u.channel.chan)); + lsm.u.channel.chan.attr.extended.ptr = NULL; - memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan)); + if (!in_chan->attr.extended.ptr) { + struct lttng_channel *channel; + struct lttng_channel_extended *extended; - lsm.cmd_type = LTTNG_ENABLE_CHANNEL; + channel = lttng_channel_create(&handle->domain); + if (!channel) { + return -LTTNG_ERR_NOMEM; + } + + /* + * Create a new channel in order to use default extended + * attribute values. + */ + extended = (struct lttng_channel_extended *) + channel->attr.extended.ptr; + memcpy(&lsm.u.channel.extended, extended, sizeof(*extended)); + lttng_channel_destroy(channel); + } else { + struct lttng_channel_extended *extended; + + extended = (struct lttng_channel_extended *) + in_chan->attr.extended.ptr; + memcpy(&lsm.u.channel.extended, extended, sizeof(*extended)); + } + + /* + * Verify that the amount of memory required to create the requested + * buffer is available on the system at the moment. + */ + total_buffer_size_needed_per_cpu = lsm.u.channel.chan.attr.num_subbuf * + lsm.u.channel.chan.attr.subbuf_size; + if (!check_enough_available_memory(total_buffer_size_needed_per_cpu)) { + return -LTTNG_ERR_NOMEM; + } + lsm.cmd_type = LTTNG_ENABLE_CHANNEL; lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); lttng_ctl_copy_string(lsm.session.name, handle->session_name, @@ -1485,61 +1747,308 @@ const char *lttng_strerror(int code) return error_get_str(code); } -/* - * Create a brand new session using name and url for destination. - * - * Returns LTTNG_OK on success or a negative error code. - */ -int lttng_create_session(const char *name, const char *url) +enum lttng_error_code lttng_create_session_ext( + struct lttng_session_descriptor *session_descriptor) { + enum lttng_error_code ret_code; + struct lttcomm_session_msg lsm = { + .cmd_type = LTTNG_CREATE_SESSION_EXT, + }; + void *reply = NULL; + struct lttng_buffer_view reply_view; + int reply_ret; + bool sessiond_must_generate_ouput; + struct lttng_dynamic_buffer payload; int ret; - ssize_t size; - struct lttcomm_session_msg lsm; - struct lttng_uri *uris = NULL; + size_t descriptor_size; + struct lttng_session_descriptor *descriptor_reply = NULL; - if (name == NULL) { - return -LTTNG_ERR_INVALID; + lttng_dynamic_buffer_init(&payload); + if (!session_descriptor) { + ret_code = LTTNG_ERR_INVALID; + goto end; } - memset(&lsm, 0, sizeof(lsm)); + sessiond_must_generate_ouput = + !lttng_session_descriptor_is_output_destination_initialized( + session_descriptor); + if (sessiond_must_generate_ouput) { + const char *home_dir = utils_get_home_dir(); + size_t home_dir_len = home_dir ? strlen(home_dir) + 1 : 0; - lsm.cmd_type = LTTNG_CREATE_SESSION; - lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); + if (!home_dir || home_dir_len > LTTNG_PATH_MAX) { + ret_code = LTTNG_ERR_FATAL; + goto end; + } - /* There should never be a data URL */ - size = uri_parse_str_urls(url, NULL, &uris); - if (size < 0) { - return -LTTNG_ERR_INVALID; + lsm.u.create_session.home_dir_size = (uint16_t) home_dir_len; + ret = lttng_dynamic_buffer_append(&payload, home_dir, + home_dir_len); + if (ret) { + ret_code = LTTNG_ERR_NOMEM; + goto end; + } } - lsm.u.uri.size = size; + descriptor_size = payload.size; + ret = lttng_session_descriptor_serialize(session_descriptor, + &payload); + if (ret) { + ret_code = LTTNG_ERR_INVALID; + goto end; + } + descriptor_size = payload.size - descriptor_size; + lsm.u.create_session.session_descriptor_size = descriptor_size; - ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, - sizeof(struct lttng_uri) * size, NULL); + /* Command returns a session descriptor on success. */ + reply_ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, payload.data, + payload.size, &reply); + if (reply_ret < 0) { + ret_code = -reply_ret; + goto end; + } else if (reply_ret == 0) { + /* Socket unexpectedly closed by the session daemon. */ + ret_code = LTTNG_ERR_FATAL; + goto end; + } - free(uris); - return ret; + reply_view = lttng_buffer_view_init(reply, 0, reply_ret); + ret = lttng_session_descriptor_create_from_buffer(&reply_view, + &descriptor_reply); + if (ret < 0) { + ret_code = LTTNG_ERR_FATAL; + goto end; + } + ret_code = LTTNG_OK; + lttng_session_descriptor_assign(session_descriptor, descriptor_reply); +end: + free(reply); + lttng_dynamic_buffer_reset(&payload); + lttng_session_descriptor_destroy(descriptor_reply); + return ret_code; } /* - * Destroy session using name. - * Returns size of returned session payload data or a negative error code. + * Create a new session using name and url for destination. + * + * Return 0 on success else a negative LTTng error code. + */ +int lttng_create_session(const char *name, const char *url) +{ + int ret; + ssize_t size; + struct lttng_uri *uris = NULL; + struct lttng_session_descriptor *descriptor = NULL; + enum lttng_error_code ret_code; + + if (!name) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + + size = uri_parse_str_urls(url, NULL, &uris); + if (size < 0) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + switch (size) { + case 0: + descriptor = lttng_session_descriptor_create(name); + break; + case 1: + if (uris[0].dtype != LTTNG_DST_PATH) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + descriptor = lttng_session_descriptor_local_create(name, + uris[0].dst.path); + break; + case 2: + descriptor = lttng_session_descriptor_network_create(name, url, + NULL); + break; + default: + ret = -LTTNG_ERR_INVALID; + goto end; + } + if (!descriptor) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + ret_code = lttng_create_session_ext(descriptor); + ret = ret_code == LTTNG_OK ? 0 : -ret_code; +end: + lttng_session_descriptor_destroy(descriptor); + free(uris); + return ret; +} + +/* + * Create a session exclusively used for snapshot. + * + * Return 0 on success else a negative LTTng error code. + */ +int lttng_create_session_snapshot(const char *name, const char *snapshot_url) +{ + int ret; + enum lttng_error_code ret_code; + ssize_t size; + struct lttng_uri *uris = NULL; + struct lttng_session_descriptor *descriptor = NULL; + + if (!name) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + + size = uri_parse_str_urls(snapshot_url, NULL, &uris); + if (size < 0) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + /* + * If the user does not specify a custom subdir, use the session name. + */ + if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && + strlen(uris[0].subdir) == 0) { + ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", + name); + if (ret < 0) { + PERROR("Failed to set session name as network destination sub-directory"); + ret = -LTTNG_ERR_FATAL; + goto end; + } else if (ret >= sizeof(uris[0].subdir)) { + /* Truncated output. */ + ret = -LTTNG_ERR_INVALID; + goto end; + } + } + + switch (size) { + case 0: + descriptor = lttng_session_descriptor_snapshot_create(name); + break; + case 1: + if (uris[0].dtype != LTTNG_DST_PATH) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + descriptor = lttng_session_descriptor_snapshot_local_create( + name, + uris[0].dst.path); + break; + case 2: + descriptor = lttng_session_descriptor_snapshot_network_create( + name, + snapshot_url, + NULL); + break; + default: + ret = -LTTNG_ERR_INVALID; + goto end; + } + if (!descriptor) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + ret_code = lttng_create_session_ext(descriptor); + ret = ret_code == LTTNG_OK ? 0 : -ret_code; +end: + lttng_session_descriptor_destroy(descriptor); + free(uris); + return ret; +} + +/* + * Create a session exclusively used for live. + * + * Return 0 on success else a negative LTTng error code. + */ +int lttng_create_session_live(const char *name, const char *url, + unsigned int timer_interval) +{ + int ret; + enum lttng_error_code ret_code; + struct lttng_session_descriptor *descriptor = NULL; + + if (!name) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + + if (url) { + descriptor = lttng_session_descriptor_live_network_create( + name, url, NULL, timer_interval); + } else { + descriptor = lttng_session_descriptor_live_create( + name, timer_interval); + } + if (!descriptor) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + ret_code = lttng_create_session_ext(descriptor); + ret = ret_code == LTTNG_OK ? 0 : -ret_code; +end: + lttng_session_descriptor_destroy(descriptor); + return ret; +} + +/* + * Stop the session and wait for the data before destroying it + * + * Return 0 on success else a negative LTTng error code. */ int lttng_destroy_session(const char *session_name) { - struct lttcomm_session_msg lsm; + int ret; + enum lttng_error_code ret_code; + enum lttng_destruction_handle_status status; + struct lttng_destruction_handle *handle = NULL; - if (session_name == NULL) { - return -LTTNG_ERR_INVALID; + /* + * Stop the tracing and wait for the data to be + * consumed. + */ + ret = _lttng_stop_tracing(session_name, 1); + if (ret && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) { + goto end; } - memset(&lsm, 0, sizeof(lsm)); - lsm.cmd_type = LTTNG_DESTROY_SESSION; + ret_code = lttng_destroy_session_ext(session_name, &handle); + if (ret_code != LTTNG_OK) { + ret = (int) -ret_code; + goto end; + } + assert(handle); - lttng_ctl_copy_string(lsm.session.name, session_name, - sizeof(lsm.session.name)); + /* Block until the completion of the destruction of the session. */ + status = lttng_destruction_handle_wait_for_completion(handle, -1); + if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_COMPLETED) { + ret = -LTTNG_ERR_UNK; + goto end; + } - return lttng_ctl_ask_sessiond(&lsm, NULL); + status = lttng_destruction_handle_get_result(handle, &ret_code); + if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_OK) { + ret = -LTTNG_ERR_UNK; + goto end; + } + ret = ret_code == LTTNG_OK ? 0 : -ret_code; +end: + lttng_destruction_handle_destroy(handle); + return ret; +} + +/* + * Destroy the session without waiting for the data. + */ +int lttng_destroy_session_no_wait(const char *session_name) +{ + enum lttng_error_code ret_code; + + ret_code = lttng_destroy_session_ext(session_name, NULL); + return ret_code == LTTNG_OK ? ret_code : -ret_code; } /* @@ -1548,19 +2057,72 @@ int lttng_destroy_session(const char *session_name) * Returns the number of lttng_session entries in sessions; * on error, returns a negative value. */ -int lttng_list_sessions(struct lttng_session **sessions) +int lttng_list_sessions(struct lttng_session **out_sessions) { int ret; struct lttcomm_session_msg lsm; + const size_t session_size = sizeof(struct lttng_session) + + sizeof(struct lttng_session_extended); + size_t session_count, i; + struct lttng_session_extended *sessions_extended_begin; + struct lttng_session *sessions = NULL; memset(&lsm, 0, sizeof(lsm)); lsm.cmd_type = LTTNG_LIST_SESSIONS; - ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions); - if (ret < 0) { - return ret; + ret = lttng_ctl_ask_sessiond(&lsm, (void**) &sessions); + if (ret <= 0) { + goto end; + } + if (!sessions) { + ret = -LTTNG_ERR_FATAL; + goto end; + } + + if (ret % session_size) { + ret = -LTTNG_ERR_UNK; + free(sessions); + *out_sessions = NULL; + goto end; + } + session_count = (size_t) ret / session_size; + sessions_extended_begin = (struct lttng_session_extended *) + (&sessions[session_count]); + + /* Set extended session info pointers. */ + for (i = 0; i < session_count; i++) { + struct lttng_session *session = &sessions[i]; + struct lttng_session_extended *extended = + &(sessions_extended_begin[i]); + + session->extended.ptr = extended; + } + + ret = (int) session_count; + *out_sessions = sessions; +end: + return ret; +} + +enum lttng_error_code lttng_session_get_creation_time( + const struct lttng_session *session, uint64_t *creation_time) +{ + enum lttng_error_code ret = LTTNG_OK; + struct lttng_session_extended *extended; + + if (!session || !creation_time || !session->extended.ptr) { + ret = LTTNG_ERR_INVALID; + goto end; } - return ret / sizeof(struct lttng_session); + extended = session->extended.ptr; + if (!extended->creation_time.is_set) { + /* Not created on the session daemon yet. */ + ret = LTTNG_ERR_SESSION_NOT_EXIST; + goto end; + } + *creation_time = extended->creation_time.value; +end: + return ret; } int lttng_set_session_shm_path(const char *session_name, @@ -1623,10 +2185,15 @@ int lttng_list_channels(struct lttng_handle *handle, struct lttng_channel **channels) { int ret; + size_t channel_count, i; + const size_t channel_size = sizeof(struct lttng_channel) + + sizeof(struct lttng_channel_extended); struct lttcomm_session_msg lsm; + void *extended_at; if (handle == NULL) { - return -LTTNG_ERR_INVALID; + ret = -LTTNG_ERR_INVALID; + goto end; } memset(&lsm, 0, sizeof(lsm)); @@ -1638,10 +2205,30 @@ int lttng_list_channels(struct lttng_handle *handle, ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels); if (ret < 0) { - return ret; + goto end; + } + + if (ret % channel_size) { + ret = -LTTNG_ERR_UNK; + free(*channels); + *channels = NULL; + goto end; + } + channel_count = (size_t) ret / channel_size; + + /* Set extended info pointers */ + extended_at = ((void *) *channels) + + channel_count * sizeof(struct lttng_channel); + for (i = 0; i < channel_count; i++) { + struct lttng_channel *chan = &(*channels)[i]; + + chan->attr.extended.ptr = extended_at; + extended_at += sizeof(struct lttng_channel_extended); } - return ret / sizeof(struct lttng_channel); + ret = (int) channel_count; +end: + return ret; } /* @@ -1655,6 +2242,13 @@ int lttng_list_events(struct lttng_handle *handle, { int ret; struct lttcomm_session_msg lsm; + struct lttcomm_event_command_header *cmd_header = NULL; + size_t cmd_header_len; + uint32_t nb_events, i; + void *comm_ext_at; + char *reception_buffer = NULL; + struct lttng_dynamic_buffer listing; + size_t storage_req; /* Safety check. An handle and channel name are mandatory */ if (handle == NULL || channel_name == NULL) { @@ -1667,15 +2261,223 @@ int lttng_list_events(struct lttng_handle *handle, sizeof(lsm.session.name)); lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name, sizeof(lsm.u.list.channel_name)); - lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); - ret = lttng_ctl_ask_sessiond(&lsm, (void**) events); + ret = lttng_ctl_ask_sessiond_fds_varlen(&lsm, NULL, 0, NULL, 0, + (void **) &reception_buffer, (void **) &cmd_header, + &cmd_header_len); if (ret < 0) { - return ret; + goto end; } - return ret / sizeof(struct lttng_event); + if (!cmd_header) { + ret = -LTTNG_ERR_UNK; + goto end; + } + + /* Set number of events and free command header */ + nb_events = cmd_header->nb_events; + if (nb_events > INT_MAX) { + ret = -EOVERFLOW; + goto end; + } + free(cmd_header); + cmd_header = NULL; + + /* + * The buffer that is returned must contain a "flat" version of + * the events that are returned. In other words, all pointers + * within an lttng_event must point to a location within the returned + * buffer so that the user may free everything by simply calling free() + * on the returned buffer. This is needed in order to maintain API + * compatibility. + * + * A first pass is performed to compute the size of the buffer that + * must be allocated. A second pass is then performed to setup + * the returned events so that their members always point within the + * buffer. + * + * The layout of the returned buffer is as follows: + * - struct lttng_event[nb_events], + * - nb_events times the following: + * - struct lttng_event_extended, + * - flattened version of userspace_probe_location + * - filter_expression + * - exclusions + * - padding to align to 64-bits + */ + comm_ext_at = reception_buffer + + (nb_events * sizeof(struct lttng_event)); + storage_req = nb_events * sizeof(struct lttng_event); + + for (i = 0; i < nb_events; i++) { + struct lttcomm_event_extended_header *ext_comm = + (struct lttcomm_event_extended_header *) comm_ext_at; + int probe_storage_req = 0; + + comm_ext_at += sizeof(*ext_comm); + comm_ext_at += ext_comm->filter_len; + comm_ext_at += + ext_comm->nb_exclusions * LTTNG_SYMBOL_NAME_LEN; + + if (ext_comm->userspace_probe_location_len) { + struct lttng_userspace_probe_location *probe_location = NULL; + struct lttng_buffer_view probe_location_view; + + probe_location_view = lttng_buffer_view_init( + comm_ext_at, 0, + ext_comm->userspace_probe_location_len); + + /* + * Create a temporary userspace probe location to + * determine the size needed by a "flattened" version + * of that same probe location. + */ + ret = lttng_userspace_probe_location_create_from_buffer( + &probe_location_view, &probe_location); + if (ret < 0) { + ret = -LTTNG_ERR_PROBE_LOCATION_INVAL; + goto end; + } + + ret = lttng_userspace_probe_location_flatten( + probe_location, NULL); + lttng_userspace_probe_location_destroy(probe_location); + if (ret < 0) { + ret = -LTTNG_ERR_PROBE_LOCATION_INVAL; + goto end; + } + + probe_storage_req = ret; + comm_ext_at += ext_comm->userspace_probe_location_len; + } + + storage_req += sizeof(struct lttng_event_extended); + storage_req += ext_comm->filter_len; + storage_req += ext_comm->nb_exclusions * LTTNG_SYMBOL_NAME_LEN; + /* Padding to ensure the flat probe is aligned. */ + storage_req = ALIGN_TO(storage_req, sizeof(uint64_t)); + storage_req += probe_storage_req; + } + + lttng_dynamic_buffer_init(&listing); + /* + * We must ensure that "listing" is never resized so as to preserve + * the validity of the flattened objects. + */ + ret = lttng_dynamic_buffer_set_capacity(&listing, storage_req); + if (ret) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = lttng_dynamic_buffer_append(&listing, reception_buffer, + nb_events * sizeof(struct lttng_event)); + if (ret) { + ret = -LTTNG_ERR_NOMEM; + goto free_dynamic_buffer; + } + + comm_ext_at = reception_buffer + + (nb_events * sizeof(struct lttng_event)); + for (i = 0; i < nb_events; i++) { + struct lttng_event *event = (struct lttng_event *) + (listing.data + (sizeof(struct lttng_event) * i)); + struct lttcomm_event_extended_header *ext_comm = + (struct lttcomm_event_extended_header *) comm_ext_at; + struct lttng_event_extended *event_extended = + (struct lttng_event_extended *) + (listing.data + listing.size); + + /* Insert struct lttng_event_extended. */ + ret = lttng_dynamic_buffer_set_size(&listing, + listing.size + sizeof(*event_extended)); + if (ret) { + ret = -LTTNG_ERR_NOMEM; + goto free_dynamic_buffer; + } + event->extended.ptr = event_extended; + + comm_ext_at += sizeof(*ext_comm); + + /* Insert filter expression. */ + if (ext_comm->filter_len) { + event_extended->filter_expression = listing.data + + listing.size; + ret = lttng_dynamic_buffer_append(&listing, comm_ext_at, + ext_comm->filter_len); + if (ret) { + ret = -LTTNG_ERR_NOMEM; + goto free_dynamic_buffer; + } + comm_ext_at += ext_comm->filter_len; + } + + /* Insert exclusions. */ + if (ext_comm->nb_exclusions) { + event_extended->exclusions.count = + ext_comm->nb_exclusions; + event_extended->exclusions.strings = + listing.data + listing.size; + + ret = lttng_dynamic_buffer_append(&listing, + comm_ext_at, + ext_comm->nb_exclusions * LTTNG_SYMBOL_NAME_LEN); + if (ret) { + ret = -LTTNG_ERR_NOMEM; + goto free_dynamic_buffer; + } + comm_ext_at += ext_comm->nb_exclusions * LTTNG_SYMBOL_NAME_LEN; + } + + /* Insert padding to align to 64-bits. */ + ret = lttng_dynamic_buffer_set_size(&listing, + ALIGN_TO(listing.size, sizeof(uint64_t))); + if (ret) { + ret = -LTTNG_ERR_NOMEM; + goto free_dynamic_buffer; + } + + /* Insert flattened userspace probe location. */ + if (ext_comm->userspace_probe_location_len) { + struct lttng_userspace_probe_location *probe_location = NULL; + struct lttng_buffer_view probe_location_view; + + probe_location_view = lttng_buffer_view_init( + comm_ext_at, 0, + ext_comm->userspace_probe_location_len); + + ret = lttng_userspace_probe_location_create_from_buffer( + &probe_location_view, &probe_location); + if (ret < 0) { + ret = -LTTNG_ERR_PROBE_LOCATION_INVAL; + goto free_dynamic_buffer; + } + + event_extended->probe_location = (struct lttng_userspace_probe_location *) + (listing.data + listing.size); + ret = lttng_userspace_probe_location_flatten( + probe_location, &listing); + lttng_userspace_probe_location_destroy(probe_location); + if (ret < 0) { + ret = -LTTNG_ERR_PROBE_LOCATION_INVAL; + goto free_dynamic_buffer; + } + + comm_ext_at += ext_comm->userspace_probe_location_len; + } + } + + /* Don't reset listing buffer as we return its content. */ + *events = (struct lttng_event *) listing.data; + lttng_dynamic_buffer_init(&listing); + ret = (int) nb_events; +free_dynamic_buffer: + lttng_dynamic_buffer_reset(&listing); +end: + free(cmd_header); + free(reception_buffer); + return ret; } /* @@ -1696,26 +2498,13 @@ int lttng_set_tracing_group(const char *name) return 0; } -/* - * Returns size of returned session payload data or a negative error code. - */ int lttng_calibrate(struct lttng_handle *handle, struct lttng_calibrate *calibrate) { - struct lttcomm_session_msg lsm; - - /* Safety check. NULL pointer are forbidden */ - if (handle == NULL || calibrate == NULL) { - return -LTTNG_ERR_INVALID; - } - - memset(&lsm, 0, sizeof(lsm)); - lsm.cmd_type = LTTNG_CALIBRATE; - lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); - - memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate)); - - return lttng_ctl_ask_sessiond(&lsm, NULL); + /* + * This command was removed in LTTng 2.9. + */ + return -LTTNG_ERR_UND; } /* @@ -1725,11 +2514,14 @@ int lttng_calibrate(struct lttng_handle *handle, void lttng_channel_set_default_attr(struct lttng_domain *domain, struct lttng_channel_attr *attr) { + struct lttng_channel_extended *extended; + /* Safety check */ if (attr == NULL || domain == NULL) { return; } + extended = (struct lttng_channel_extended *) attr->extended.ptr; memset(attr, 0, sizeof(struct lttng_channel_attr)); /* Same for all domains. */ @@ -1745,6 +2537,12 @@ void lttng_channel_set_default_attr(struct lttng_domain *domain, attr->subbuf_size = default_get_kernel_channel_subbuf_size(); attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT; + if (extended) { + extended->monitor_timer_interval = + DEFAULT_KERNEL_CHANNEL_MONITOR_TIMER; + extended->blocking_timeout = + DEFAULT_KERNEL_CHANNEL_BLOCKING_TIMEOUT; + } break; case LTTNG_DOMAIN_UST: switch (domain->buf_type) { @@ -1756,6 +2554,12 @@ void lttng_channel_set_default_attr(struct lttng_domain *domain, DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER; attr->read_timer_interval = DEFAULT_UST_UID_CHANNEL_READ_TIMER; + if (extended) { + extended->monitor_timer_interval = + DEFAULT_UST_UID_CHANNEL_MONITOR_TIMER; + extended->blocking_timeout = + DEFAULT_UST_UID_CHANNEL_BLOCKING_TIMEOUT; + } break; case LTTNG_BUFFER_PER_PID: default: @@ -1766,18 +2570,171 @@ void lttng_channel_set_default_attr(struct lttng_domain *domain, DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER; attr->read_timer_interval = DEFAULT_UST_PID_CHANNEL_READ_TIMER; + if (extended) { + extended->monitor_timer_interval = + DEFAULT_UST_PID_CHANNEL_MONITOR_TIMER; + extended->blocking_timeout = + DEFAULT_UST_PID_CHANNEL_BLOCKING_TIMEOUT; + } break; } default: /* Default behavior: leave set to 0. */ break; } + + attr->extended.ptr = extended; } -/* - * Check if session daemon is alive. - * - * Return 1 if alive or 0 if not. +int lttng_channel_get_discarded_event_count(struct lttng_channel *channel, + uint64_t *discarded_events) +{ + int ret = 0; + struct lttng_channel_extended *chan_ext; + + if (!channel || !discarded_events) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + + chan_ext = channel->attr.extended.ptr; + if (!chan_ext) { + /* + * This can happen since the lttng_channel structure is + * used for other tasks where this pointer is never set. + */ + *discarded_events = 0; + goto end; + } + + *discarded_events = chan_ext->discarded_events; +end: + return ret; +} + +int lttng_channel_get_lost_packet_count(struct lttng_channel *channel, + uint64_t *lost_packets) +{ + int ret = 0; + struct lttng_channel_extended *chan_ext; + + if (!channel || !lost_packets) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + + chan_ext = channel->attr.extended.ptr; + if (!chan_ext) { + /* + * This can happen since the lttng_channel structure is + * used for other tasks where this pointer is never set. + */ + *lost_packets = 0; + goto end; + } + + *lost_packets = chan_ext->lost_packets; +end: + return ret; +} + +int lttng_channel_get_monitor_timer_interval(struct lttng_channel *chan, + uint64_t *monitor_timer_interval) +{ + int ret = 0; + + if (!chan || !monitor_timer_interval) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + + if (!chan->attr.extended.ptr) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + + *monitor_timer_interval = ((struct lttng_channel_extended *) + chan->attr.extended.ptr)->monitor_timer_interval; +end: + return ret; +} + +int lttng_channel_set_monitor_timer_interval(struct lttng_channel *chan, + uint64_t monitor_timer_interval) +{ + int ret = 0; + + if (!chan || !chan->attr.extended.ptr) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + + ((struct lttng_channel_extended *) + chan->attr.extended.ptr)->monitor_timer_interval = + monitor_timer_interval; +end: + return ret; +} + +int lttng_channel_get_blocking_timeout(struct lttng_channel *chan, + int64_t *blocking_timeout) +{ + int ret = 0; + + if (!chan || !blocking_timeout) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + + if (!chan->attr.extended.ptr) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + + *blocking_timeout = ((struct lttng_channel_extended *) + chan->attr.extended.ptr)->blocking_timeout; +end: + return ret; +} + +int lttng_channel_set_blocking_timeout(struct lttng_channel *chan, + int64_t blocking_timeout) +{ + int ret = 0; + int64_t msec_timeout; + + if (!chan || !chan->attr.extended.ptr) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + + if (blocking_timeout < 0 && blocking_timeout != -1) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + + /* + * LTTng-ust's use of poll() to implement this timeout mechanism forces + * us to accept a narrower range of values (msecs expressed as a signed + * 32-bit integer). + */ + msec_timeout = blocking_timeout / 1000; + if (msec_timeout != (int32_t) msec_timeout) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + + ((struct lttng_channel_extended *) + chan->attr.extended.ptr)->blocking_timeout = + blocking_timeout; +end: + return ret; +} + +/* + * Check if session daemon is alive. + * + * Return 1 if alive or 0 if not. * On error returns a negative value. */ int lttng_session_daemon_alive(void) @@ -1840,7 +2797,7 @@ int lttng_set_consumer_url(struct lttng_handle *handle, lsm.u.uri.size = size; - ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, + ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris, sizeof(struct lttng_uri) * size, NULL); free(uris); @@ -1864,71 +2821,12 @@ int lttng_disable_consumer(struct lttng_handle *handle) } /* - * This is an extension of create session that is ONLY and SHOULD only be used - * by the lttng command line program. It exists to avoid using URI parsing in - * the lttng client. - * - * We need the date and time for the trace path subdirectory for the case where - * the user does NOT define one using either -o or -U. Using the normal - * lttng_create_session API call, we have no clue on the session daemon side if - * the URL was generated automatically by the client or define by the user. - * - * So this function "wrapper" is hidden from the public API, takes the datetime - * string and appends it if necessary to the URI subdirectory before sending it - * to the session daemon. - * - * With this extra function, the lttng_create_session call behavior is not - * changed and the timestamp is appended to the URI on the session daemon side - * if necessary. + * [OBSOLETE] */ int _lttng_create_session_ext(const char *name, const char *url, const char *datetime) { - int ret; - ssize_t size; - struct lttcomm_session_msg lsm; - struct lttng_uri *uris = NULL; - - if (name == NULL || datetime == NULL) { - return -LTTNG_ERR_INVALID; - } - - memset(&lsm, 0, sizeof(lsm)); - - lsm.cmd_type = LTTNG_CREATE_SESSION; - lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); - - /* There should never be a data URL. */ - size = uri_parse_str_urls(url, NULL, &uris); - if (size < 0) { - ret = -LTTNG_ERR_INVALID; - goto error; - } - - lsm.u.uri.size = size; - - if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) { - /* Don't append datetime if the name was automatically created. */ - if (strncmp(name, DEFAULT_SESSION_NAME "-", - strlen(DEFAULT_SESSION_NAME) + 1)) { - ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s", - name, datetime); - } else { - ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name); - } - if (ret < 0) { - PERROR("snprintf uri subdir"); - ret = -LTTNG_ERR_FATAL; - goto error; - } - } - - ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, - sizeof(struct lttng_uri) * size, NULL); - -error: - free(uris); - return ret; + return -ENOSYS; } /* @@ -1959,6 +2857,10 @@ int lttng_data_pending(const char *session_name) /* Unexpected payload size */ ret = -LTTNG_ERR_INVALID; goto end; + } else if (!pending) { + /* Internal error. */ + ret = -LTTNG_ERR_UNK; + goto end; } ret = (int) *pending; @@ -1968,139 +2870,192 @@ end: } /* - * Create a session exclusively used for snapshot. + * List PIDs in the tracker. + * + * enabled is set to whether the PID tracker is enabled. + * pids is set to an allocated array of PIDs currently tracked. On + * success, pids must be freed by the caller. + * nr_pids is set to the number of entries contained by the pids array. * - * Returns LTTNG_OK on success or a negative error code. + * Returns 0 on success, else a negative LTTng error code. */ -int lttng_create_session_snapshot(const char *name, const char *snapshot_url) +int lttng_list_tracker_pids(struct lttng_handle *handle, + int *_enabled, int32_t **_pids, size_t *_nr_pids) { int ret; - ssize_t size; + int enabled = 1; struct lttcomm_session_msg lsm; - struct lttng_uri *uris = NULL; + size_t nr_pids; + int32_t *pids = NULL; - if (name == NULL) { + if (handle == NULL) { return -LTTNG_ERR_INVALID; } memset(&lsm, 0, sizeof(lsm)); + lsm.cmd_type = LTTNG_LIST_TRACKER_PIDS; + lttng_ctl_copy_string(lsm.session.name, handle->session_name, + sizeof(lsm.session.name)); + lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); - lsm.cmd_type = LTTNG_CREATE_SESSION_SNAPSHOT; - lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); + ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pids); + if (ret < 0) { + return ret; + } + nr_pids = ret / sizeof(int32_t); + if (nr_pids > 0 && !pids) { + return -LTTNG_ERR_UNK; + } + if (nr_pids == 1 && pids[0] == -1) { + free(pids); + pids = NULL; + enabled = 0; + nr_pids = 0; + } + *_enabled = enabled; + *_pids = pids; + *_nr_pids = nr_pids; + return 0; +} - size = uri_parse_str_urls(snapshot_url, NULL, &uris); - if (size < 0) { - return -LTTNG_ERR_INVALID; +/* + * Regenerate the metadata for a session. + * Return 0 on success, a negative error code on error. + */ +int lttng_regenerate_metadata(const char *session_name) +{ + int ret; + struct lttcomm_session_msg lsm; + + if (!session_name) { + ret = -LTTNG_ERR_INVALID; + goto end; } - lsm.u.uri.size = size; + memset(&lsm, 0, sizeof(lsm)); + lsm.cmd_type = LTTNG_REGENERATE_METADATA; - ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, - sizeof(struct lttng_uri) * size, NULL); + lttng_ctl_copy_string(lsm.session.name, session_name, + sizeof(lsm.session.name)); - free(uris); + ret = lttng_ctl_ask_sessiond(&lsm, NULL); + if (ret < 0) { + goto end; + } + + ret = 0; +end: return ret; } /* - * Create a session exclusively used for live. - * - * Returns LTTNG_OK on success or a negative error code. + * Deprecated, replaced by lttng_regenerate_metadata. */ -int lttng_create_session_live(const char *name, const char *url, - unsigned int timer_interval) +int lttng_metadata_regenerate(const char *session_name) +{ + return lttng_regenerate_metadata(session_name); +} + +/* + * Regenerate the statedump of a session. + * Return 0 on success, a negative error code on error. + */ +int lttng_regenerate_statedump(const char *session_name) { int ret; - ssize_t size; struct lttcomm_session_msg lsm; - struct lttng_uri *uris = NULL; - if (name == NULL || timer_interval == 0) { - return -LTTNG_ERR_INVALID; + if (!session_name) { + ret = -LTTNG_ERR_INVALID; + goto end; } memset(&lsm, 0, sizeof(lsm)); + lsm.cmd_type = LTTNG_REGENERATE_STATEDUMP; - lsm.cmd_type = LTTNG_CREATE_SESSION_LIVE; - lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); + lttng_ctl_copy_string(lsm.session.name, session_name, + sizeof(lsm.session.name)); - if (url) { - size = uri_parse_str_urls(url, NULL, &uris); - if (size <= 0) { - ret = -LTTNG_ERR_INVALID; - goto end; - } + ret = lttng_ctl_ask_sessiond(&lsm, NULL); + if (ret < 0) { + goto end; + } - /* file:// is not accepted for live session. */ - if (uris[0].dtype == LTTNG_DST_PATH) { - ret = -LTTNG_ERR_INVALID; - goto end; - } - } else { - size = 0; + ret = 0; +end: + return ret; +} + +int lttng_register_trigger(struct lttng_trigger *trigger) +{ + int ret; + struct lttcomm_session_msg lsm; + struct lttng_dynamic_buffer buffer; + + lttng_dynamic_buffer_init(&buffer); + if (!trigger) { + ret = -LTTNG_ERR_INVALID; + goto end; } - lsm.u.session_live.nb_uri = size; - lsm.u.session_live.timer_interval = timer_interval; + if (!lttng_trigger_validate(trigger)) { + ret = -LTTNG_ERR_INVALID_TRIGGER; + goto end; + } - ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, - sizeof(struct lttng_uri) * size, NULL); + ret = lttng_trigger_serialize(trigger, &buffer); + if (ret < 0) { + ret = -LTTNG_ERR_UNK; + goto end; + } + memset(&lsm, 0, sizeof(lsm)); + lsm.cmd_type = LTTNG_REGISTER_TRIGGER; + lsm.u.trigger.length = (uint32_t) buffer.size; + ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, buffer.data, + buffer.size, NULL); end: - free(uris); + lttng_dynamic_buffer_reset(&buffer); return ret; } -/* - * List PIDs in the tracker. - * - * enabled is set to whether the PID tracker is enabled. - * pids is set to an allocated array of PIDs currently tracked. On - * success, pids must be freed by the caller. - * nr_pids is set to the number of entries contained by the pids array. - * - * Returns 0 on success, else a negative LTTng error code. - */ -int lttng_list_tracker_pids(struct lttng_handle *handle, - int *_enabled, int32_t **_pids, size_t *_nr_pids) +int lttng_unregister_trigger(struct lttng_trigger *trigger) { int ret; - int enabled = 1; struct lttcomm_session_msg lsm; - size_t nr_pids; - int32_t *pids; + struct lttng_dynamic_buffer buffer; - if (handle == NULL) { - return -LTTNG_ERR_INVALID; + lttng_dynamic_buffer_init(&buffer); + if (!trigger) { + ret = -LTTNG_ERR_INVALID; + goto end; } - memset(&lsm, 0, sizeof(lsm)); - lsm.cmd_type = LTTNG_LIST_TRACKER_PIDS; - lttng_ctl_copy_string(lsm.session.name, handle->session_name, - sizeof(lsm.session.name)); - lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); + if (!lttng_trigger_validate(trigger)) { + ret = -LTTNG_ERR_INVALID_TRIGGER; + goto end; + } - ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pids); + ret = lttng_trigger_serialize(trigger, &buffer); if (ret < 0) { - return ret; - } - nr_pids = ret / sizeof(int32_t); - if (nr_pids == 1 && pids[0] == -1) { - free(pids); - pids = NULL; - enabled = 0; - nr_pids = 0; + ret = -LTTNG_ERR_UNK; + goto end; } - *_enabled = enabled; - *_pids = pids; - *_nr_pids = nr_pids; - return 0; + + memset(&lsm, 0, sizeof(lsm)); + lsm.cmd_type = LTTNG_UNREGISTER_TRIGGER; + lsm.u.trigger.length = (uint32_t) buffer.size; + ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, buffer.data, + buffer.size, NULL); +end: + lttng_dynamic_buffer_reset(&buffer); + return ret; } /* * lib constructor. */ -static void __attribute__((constructor)) init() +static void __attribute__((constructor)) init(void) { /* Set default session group */ lttng_set_tracing_group(DEFAULT_TRACING_GROUP); @@ -2109,7 +3064,7 @@ static void __attribute__((constructor)) init() /* * lib destructor. */ -static void __attribute__((destructor)) lttng_ctl_exit() +static void __attribute__((destructor)) lttng_ctl_exit(void) { free(tracing_group); }