X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=libust%2Ftracectl.c;h=2e9436520e099947817825741928192958a7d9d3;hb=86699c2035dd69428706ade2d6dfb150ada757cb;hp=faa471461c71c901b9399682ac019f0cb8fe1c13;hpb=60e57148f47eb3a3116de47e23516fc5df8c968e;p=ust.git diff --git a/libust/tracectl.c b/libust/tracectl.c index faa4714..2e94365 100644 --- a/libust/tracectl.c +++ b/libust/tracectl.c @@ -15,88 +15,58 @@ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ +/* This file contains the implementation of the UST listener thread, which + * receives trace control commands. It also coordinates the initialization of + * libust. + */ + #define _GNU_SOURCE #include +#include #include +#include #include +#include +#include #include #include -#include -#include #include #include #include +#include +#include -#include - -#include "marker.h" +#include +#include +#include #include "tracer.h" -#include "localerr.h" +#include "usterr.h" #include "ustcomm.h" -#include "relay.h" /* FIXME: remove */ +#include "buffers.h" #include "marker-control.h" -//#define USE_CLONE - #define USTSIGNAL SIGIO #define MAX_MSG_SIZE (100) #define MSG_NOTIF 1 #define MSG_REGISTER_NOTIF 2 -char consumer_stack[10000]; - /* This should only be accessed by the constructor, before the creation * of the listener, and then only by the listener. */ s64 pidunique = -1LL; -struct list_head blocked_consumers = LIST_HEAD_INIT(blocked_consumers); - -static struct ustcomm_app ustcomm_app; +static int epoll_fd; +static struct ustcomm_sock *listen_sock; -struct tracecmd { /* no padding */ - uint32_t size; - uint16_t command; -}; +extern struct chan_info_struct chan_infos[]; -/* volatile because shared between the listener and the main thread */ -volatile sig_atomic_t buffers_to_export = 0; - -//struct listener_arg { -// int pipe_fd; -//}; - -struct trctl_msg { - /* size: the size of all the fields except size itself */ - uint32_t size; - uint16_t type; - /* Only the necessary part of the payload is transferred. It - * may even be none of it. - */ - char payload[94]; -}; +static struct list_head open_buffers_list = LIST_HEAD_INIT(open_buffers_list); -struct consumer_channel { - int fd; - struct ltt_channel_struct *chan; -}; +static struct list_head ust_socks = LIST_HEAD_INIT(ust_socks); -struct blocked_consumer { - int fd_consumer; - int fd_producer; - int tmp_poll_idx; - - /* args to ustcomm_send_reply */ - struct ustcomm_server server; - struct ustcomm_source src; - - /* args to ltt_do_get_subbuf */ - struct rchan_buf *rbuf; - struct ltt_channel_buf_struct *lttbuf; - - struct list_head list; -}; +/* volatile because shared between the listener and the main thread */ +int buffers_to_export = 0; static long long make_pidunique(void) { @@ -120,44 +90,31 @@ static void print_markers(FILE *fp) marker_iter_reset(&iter); marker_iter_start(&iter); - while(iter.marker) { - fprintf(fp, "marker: %s/%s %d \"%s\"\n", iter.marker->channel, iter.marker->name, (int)imv_read(iter.marker->state), iter.marker->format); + while (iter.marker) { + fprintf(fp, "marker: %s/%s %d \"%s\" %p\n", + iter.marker->channel, + iter.marker->name, + (int)imv_read(iter.marker->state), + iter.marker->format, + iter.marker->location); marker_iter_next(&iter); } unlock_markers(); } -static int init_socket(void); - -/* This needs to be called whenever a new thread is created. It notifies - * liburcu of the new thread. - */ - -void ust_register_thread(void) -{ - rcu_register_thread(); -} - -int fd_notif = -1; -void notif_cb(void) +static void print_trace_events(FILE *fp) { - int result; - struct trctl_msg msg; + struct trace_event_iter iter; - /* FIXME: fd_notif should probably be protected by a spinlock */ + lock_trace_events(); + trace_event_iter_reset(&iter); + trace_event_iter_start(&iter); - if(fd_notif == -1) - return; - - msg.type = MSG_NOTIF; - msg.size = sizeof(msg.type); - - /* FIXME: don't block here */ - result = write(fd_notif, &msg, msg.size+sizeof(msg.size)); - if(result == -1) { - PERROR("write"); - return; + while (iter.trace_event) { + fprintf(fp, "trace_event: %s\n", iter.trace_event->name); + trace_event_iter_next(&iter); } + unlock_trace_events(); } /* Ask the daemon to collect a trace called trace_name and being @@ -169,689 +126,1097 @@ void notif_cb(void) static void inform_consumer_daemon(const char *trace_name) { - int i; - struct ltt_trace_struct *trace; + int i,j; + struct ust_trace *trace; pid_t pid = getpid(); int result; ltt_lock_traces(); trace = _ltt_trace_find(trace_name); - if(trace == NULL) { + if (trace == NULL) { WARN("inform_consumer_daemon: could not find trace \"%s\"; it is probably already destroyed", trace_name); goto finish; } - for(i=0; i < trace->nr_channels; i++) { - result = ustcomm_request_consumer(pid, trace->channels[i].channel_name); - if(result == -1) { - WARN("Failed to request collection for channel %s. Is the daemon available?", trace->channels[i].channel_name); - /* continue even if fail */ + for (i=0; i < trace->nr_channels; i++) { + if (trace->channels[i].request_collection) { + /* iterate on all cpus */ + for (j=0; jchannels[i].n_cpus; j++) { + char *buf; + if (asprintf(&buf, "%s_%d", trace->channels[i].channel_name, j) < 0) { + ERR("inform_consumer_daemon : asprintf failed (%s_%d)", + trace->channels[i].channel_name, j); + goto finish; + } + result = ustcomm_request_consumer(pid, buf); + if (result == -1) { + WARN("Failed to request collection for channel %s. Is the daemon available?", + trace->channels[i].channel_name); + /* continue even if fail */ + } + free(buf); + STORE_SHARED(buffers_to_export, LOAD_SHARED(buffers_to_export)+1); + } } - buffers_to_export++; } finish: ltt_unlock_traces(); } -void process_blocked_consumers(void) +void seperate_channel_cpu(const char *channel_and_cpu, char **channel, int *cpu) { - int n_fds = 0; - struct pollfd *fds; - struct blocked_consumer *bc; - int idx = 0; - char inbuf; - int result; - - list_for_each_entry(bc, &blocked_consumers, list) { - n_fds++; + const char *sep; + + sep = rindex(channel_and_cpu, '_'); + if (sep == NULL) { + *cpu = -1; + sep = channel_and_cpu + strlen(channel_and_cpu); + } else { + *cpu = atoi(sep+1); } - fds = (struct pollfd *) malloc(n_fds * sizeof(struct pollfd)); - if(fds == NULL) { - ERR("malloc returned NULL"); + if (asprintf(channel, "%.*s", (int)(sep-channel_and_cpu), channel_and_cpu) < 0) { + ERR("seperate_channel_cpu : asprintf failed (%.*s)", + (int)(sep-channel_and_cpu), channel_and_cpu); return; } +} + +static int do_cmd_get_shmid(const char *recvbuf, int sock) +{ + int retval = 0; + struct ust_trace *trace; + char trace_name[] = "auto"; + int i; + char *channel_and_cpu; + int found = 0; + int result; + char *ch_name; + int ch_cpu; + + DBG("get_shmid"); - list_for_each_entry(bc, &blocked_consumers, list) { - fds[idx].fd = bc->fd_producer; - fds[idx].events = POLLIN; - bc->tmp_poll_idx = idx; - idx++; + channel_and_cpu = nth_token(recvbuf, 1); + if (channel_and_cpu == NULL) { + ERR("cannot parse channel"); + retval = -1; + goto end; } - while((result = poll(fds, n_fds, 0)) == -1 && errno == EINTR) - /* nothing */; - if(result == -1) { - PERROR("poll"); - return; + seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); + if (ch_cpu == -1) { + ERR("problem parsing channel name"); + retval = -1; + goto free_short_chan_name; + } + + ltt_lock_traces(); + trace = _ltt_trace_find(trace_name); + ltt_unlock_traces(); + + if (trace == NULL) { + ERR("cannot find trace!"); + retval = -1; + goto free_short_chan_name; } - list_for_each_entry(bc, &blocked_consumers, list) { - if(fds[bc->tmp_poll_idx].revents) { - long consumed_old = 0; + for (i=0; inr_channels; i++) { + struct ust_channel *channel = &trace->channels[i]; + struct ust_buffer *buf = channel->buf[ch_cpu]; + + if (!strcmp(trace->channels[i].channel_name, ch_name)) { char *reply; - result = read(bc->fd_producer, &inbuf, 1); - if(result == -1) { - PERROR("read"); - continue; +// DBG("the shmid for the requested channel is %d", buf->shmid); +// DBG("the shmid for its buffer structure is %d", channel->buf_struct_shmids); + if (asprintf(&reply, "%d %d", buf->shmid, channel->buf_struct_shmids[ch_cpu]) < 0) { + ERR("do_cmd_get_shmid : asprintf failed (%d %d)", + buf->shmid, channel->buf_struct_shmids[ch_cpu]); + retval = -1; + goto free_short_chan_name; } - if(result == 0) { - DBG("PRODUCER END"); - close(bc->fd_producer); + result = ustcomm_send_reply(reply, sock); + if (result) { + ERR("ustcomm_send_reply failed"); + free(reply); + retval = -1; + goto free_short_chan_name; + } - list_del(&bc->list); + free(reply); - result = ustcomm_send_reply(&bc->server, "END", &bc->src); - if(result < 0) { - ERR("ustcomm_send_reply failed"); - continue; - } + found = 1; + break; + } + } - continue; - } + if (!found) { + ERR("channel not found (%s)", channel_and_cpu); + } - result = ltt_do_get_subbuf(bc->rbuf, bc->lttbuf, &consumed_old); - if(result == -EAGAIN) { - WARN("missed buffer?"); - continue; - } - else if(result < 0) { - DBG("ltt_do_get_subbuf: error: %s", strerror(-result)); + free_short_chan_name: + free(ch_name); + + end: + return retval; +} + +static int do_cmd_get_n_subbufs(const char *recvbuf, int sock) +{ + int retval = 0; + struct ust_trace *trace; + char trace_name[] = "auto"; + int i; + char *channel_and_cpu; + int found = 0; + int result; + char *ch_name; + int ch_cpu; + + DBG("get_n_subbufs"); + + channel_and_cpu = nth_token(recvbuf, 1); + if (channel_and_cpu == NULL) { + ERR("cannot parse channel"); + retval = -1; + goto end; + } + + seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); + if (ch_cpu == -1) { + ERR("problem parsing channel name"); + retval = -1; + goto free_short_chan_name; + } + + ltt_lock_traces(); + trace = _ltt_trace_find(trace_name); + ltt_unlock_traces(); + + if (trace == NULL) { + ERR("cannot find trace!"); + retval = -1; + goto free_short_chan_name; + } + + for (i=0; inr_channels; i++) { + struct ust_channel *channel = &trace->channels[i]; + + if (!strcmp(trace->channels[i].channel_name, ch_name)) { + char *reply; + + DBG("the n_subbufs for the requested channel is %d", channel->subbuf_cnt); + if (asprintf(&reply, "%d", channel->subbuf_cnt) < 0) { + ERR("do_cmd_get_n_subbufs : asprintf failed (%d)", + channel->subbuf_cnt); + retval = -1; + goto free_short_chan_name; } - asprintf(&reply, "%s %ld", "OK", consumed_old); - result = ustcomm_send_reply(&bc->server, reply, &bc->src); - if(result < 0) { + + result = ustcomm_send_reply(reply, sock); + if (result) { ERR("ustcomm_send_reply failed"); free(reply); - continue; + retval = -1; + goto free_short_chan_name; } - free(reply); - list_del(&bc->list); + free(reply); + found = 1; + break; } } + if (found == 0) { + ERR("unable to find channel"); + } + free_short_chan_name: + free(ch_name); + + end: + return retval; } -void *listener_main(void *p) +static int do_cmd_get_subbuf_size(const char *recvbuf, int sock) { + int retval = 0; + struct ust_trace *trace; + char trace_name[] = "auto"; + int i; + char *channel_and_cpu; + int found = 0; int result; + char *ch_name; + int ch_cpu; - ust_register_thread(); + DBG("get_subbuf_size"); - DBG("LISTENER"); + channel_and_cpu = nth_token(recvbuf, 1); + if (channel_and_cpu == NULL) { + ERR("cannot parse channel"); + retval = -1; + goto end; + } - for(;;) { - char trace_name[] = "auto"; - char trace_type[] = "ustrelay"; - char *recvbuf; - int len; - struct ustcomm_source src; + seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); + if (ch_cpu == -1) { + ERR("problem parsing channel name"); + retval = -1; + goto free_short_chan_name; + } - process_blocked_consumers(); + ltt_lock_traces(); + trace = _ltt_trace_find(trace_name); + ltt_unlock_traces(); - result = ustcomm_app_recv_message(&ustcomm_app, &recvbuf, &src, 5); - if(result < 0) { - WARN("error in ustcomm_app_recv_message"); - continue; - } - else if(result == 0) { - /* no message */ - continue; + if (trace == NULL) { + ERR("cannot find trace!"); + retval = -1; + goto free_short_chan_name; + } + + for (i=0; inr_channels; i++) { + struct ust_channel *channel = &trace->channels[i]; + + if (!strcmp(trace->channels[i].channel_name, ch_name)) { + char *reply; + + DBG("the subbuf_size for the requested channel is %zd", channel->subbuf_size); + if (asprintf(&reply, "%zd", channel->subbuf_size) < 0) { + ERR("do_cmd_get_subbuf_size : asprintf failed (%zd)", + channel->subbuf_size); + retval = -1; + goto free_short_chan_name; + } + + result = ustcomm_send_reply(reply, sock); + if (result) { + ERR("ustcomm_send_reply failed"); + free(reply); + retval = -1; + goto free_short_chan_name; + } + + free(reply); + found = 1; + break; } + } + if (found == 0) { + ERR("unable to find channel"); + } + + free_short_chan_name: + free(ch_name); + + end: + return retval; +} + +/* Return the power of two which is equal or higher to v */ + +static unsigned int pow2_higher_or_eq(unsigned int v) +{ + int hb = fls(v); + int retval = 1<<(hb-1); + + if (v-retval == 0) + return retval; + else + return retval<<1; +} - DBG("received a message! it's: %s", recvbuf); - len = strlen(recvbuf); +static int do_cmd_set_subbuf_size(const char *recvbuf, int sock) +{ + char *channel_slash_size; + char *ch_name = NULL; + unsigned int size, power; + int retval = 0; + struct ust_trace *trace; + char trace_name[] = "auto"; + int i; + int found = 0; + + DBG("set_subbuf_size"); + + channel_slash_size = nth_token(recvbuf, 1); + sscanf(channel_slash_size, "%a[^/]/%u", &ch_name, &size); + + if (ch_name == NULL) { + ERR("cannot parse channel"); + retval = -1; + goto end; + } + + power = pow2_higher_or_eq(size); + power = max_t(unsigned int, 2u, power); + if (power != size) + WARN("using the next power of two for buffer size = %u\n", power); - if(!strcmp(recvbuf, "print_markers")) { - print_markers(stderr); + ltt_lock_traces(); + trace = _ltt_trace_find_setup(trace_name); + if (trace == NULL) { + ERR("cannot find trace!"); + retval = -1; + goto end; + } + + for (i = 0; i < trace->nr_channels; i++) { + struct ust_channel *channel = &trace->channels[i]; + + if (!strcmp(trace->channels[i].channel_name, ch_name)) { + + channel->subbuf_size = power; + DBG("the set_subbuf_size for the requested channel is %zd", channel->subbuf_size); + + found = 1; + break; } - else if(!strcmp(recvbuf, "list_markers")) { - char *ptr; - size_t size; - FILE *fp; + } + if (found == 0) { + ERR("unable to find channel"); + } - fp = open_memstream(&ptr, &size); - print_markers(fp); - fclose(fp); + end: + ltt_unlock_traces(); + free(ch_name); + return retval; +} - result = ustcomm_send_reply(&ustcomm_app.server, ptr, &src); +static int do_cmd_set_subbuf_num(const char *recvbuf, int sock) +{ + char *channel_slash_num; + char *ch_name = NULL; + unsigned int num; + int retval = 0; + struct ust_trace *trace; + char trace_name[] = "auto"; + int i; + int found = 0; - free(ptr); + DBG("set_subbuf_num"); + + channel_slash_num = nth_token(recvbuf, 1); + sscanf(channel_slash_num, "%a[^/]/%u", &ch_name, &num); + + if (ch_name == NULL) { + ERR("cannot parse channel"); + retval = -1; + goto end; + } + if (num < 2) { + ERR("subbuffer count should be greater than 2"); + retval = -1; + goto end; + } + + ltt_lock_traces(); + trace = _ltt_trace_find_setup(trace_name); + if (trace == NULL) { + ERR("cannot find trace!"); + retval = -1; + goto end; + } + + for (i = 0; i < trace->nr_channels; i++) { + struct ust_channel *channel = &trace->channels[i]; + + if (!strcmp(trace->channels[i].channel_name, ch_name)) { + + channel->subbuf_cnt = num; + DBG("the set_subbuf_cnt for the requested channel is %zd", channel->subbuf_cnt); + + found = 1; + break; } - else if(!strcmp(recvbuf, "start")) { - /* start is an operation that setups the trace, allocates it and starts it */ - result = ltt_trace_setup(trace_name); - if(result < 0) { - ERR("ltt_trace_setup failed"); - return (void *)1; - } + } + if (found == 0) { + ERR("unable to find channel"); + } - result = ltt_trace_set_type(trace_name, trace_type); - if(result < 0) { - ERR("ltt_trace_set_type failed"); - return (void *)1; - } + end: + ltt_unlock_traces(); + free(ch_name); + return retval; +} - result = ltt_trace_alloc(trace_name); - if(result < 0) { - ERR("ltt_trace_alloc failed"); - return (void *)1; - } +static int do_cmd_get_subbuffer(const char *recvbuf, int sock) +{ + int retval = 0, found = 0;; + int i, ch_cpu, result; + long consumed_old = 0; + struct ust_trace *trace; + char trace_name[] = "auto"; + char *channel_and_cpu; + char *ch_name; + + DBG("get_subbuf"); + + channel_and_cpu = nth_token(recvbuf, 1); + if(channel_and_cpu == NULL) { + ERR("cannot parse channel"); + retval = -1; + goto end; + } - inform_consumer_daemon(trace_name); + seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); + if(ch_cpu == -1) { + ERR("problem parsing channel name"); + retval = -1; + goto free_short_chan_name; + } - result = ltt_trace_start(trace_name); - if(result < 0) { - ERR("ltt_trace_start failed"); - continue; - } + ltt_lock_traces(); + trace = _ltt_trace_find(trace_name); + + if(trace == NULL) { + int result; + + DBG("Cannot find trace. It was likely destroyed by the user."); + result = ustcomm_send_reply("NOTFOUND", sock); + if(result) { + ERR("ustcomm_send_reply failed"); + retval = -1; + goto unlock_traces; } - else if(!strcmp(recvbuf, "trace_setup")) { - DBG("trace setup"); - result = ltt_trace_setup(trace_name); - if(result < 0) { - ERR("ltt_trace_setup failed"); - return (void *)1; - } + goto unlock_traces; + } - result = ltt_trace_set_type(trace_name, trace_type); - if(result < 0) { - ERR("ltt_trace_set_type failed"); - return (void *)1; + for(i=0; inr_channels; i++) { + struct ust_channel *channel = &trace->channels[i]; + + if(!strcmp(trace->channels[i].channel_name, ch_name)) { + struct ust_buffer *buf = channel->buf[ch_cpu]; + char *reply; + + found = 1; + + result = ust_buffers_get_subbuf(buf, &consumed_old); + if(result == -EAGAIN) { + WARN("missed buffer?"); + retval = 0; + + goto unlock_traces; + } else if (result < 0) { + ERR("ust_buffers_get_subbuf: error: %s", strerror(-result)); + retval = -1; + + goto unlock_traces; } - } - else if(!strcmp(recvbuf, "trace_alloc")) { - DBG("trace alloc"); + if (asprintf(&reply, "%s %ld", "OK", consumed_old) < 0) { + ERR("do_cmd_get_subbuffer: asprintf failed (OK %ld)", + consumed_old); + retval = -1; - result = ltt_trace_alloc(trace_name); - if(result < 0) { - ERR("ltt_trace_alloc failed"); - return (void *)1; + goto unlock_traces; } - } - else if(!strcmp(recvbuf, "trace_start")) { - DBG("trace start"); + result = ustcomm_send_reply(reply, sock); + if (result < 0) { + ERR("ustcomm_send_reply failed"); + free(reply); + retval = -1; - result = ltt_trace_start(trace_name); - if(result < 0) { - ERR("ltt_trace_start failed"); - continue; + goto unlock_traces; } + free(reply); + + break; } - else if(!strcmp(recvbuf, "trace_stop")) { - DBG("trace stop"); + } + if(found == 0) { + result = ustcomm_send_reply("NOTFOUND", sock); + if (result <= 0) { + ERR("ustcomm_send_reply failed"); + retval = -1; - result = ltt_trace_stop(trace_name); - if(result < 0) { - ERR("ltt_trace_stop failed"); - return (void *)1; - } + goto unlock_traces; } - else if(!strcmp(recvbuf, "trace_destroy")) { + ERR("unable to find channel"); + } + + unlock_traces: + ltt_unlock_traces(); - DBG("trace destroy"); + free_short_chan_name: + free(ch_name); - result = ltt_trace_destroy(trace_name); - if(result < 0) { - ERR("ltt_trace_destroy failed"); - return (void *)1; - } - } - else if(nth_token_is(recvbuf, "get_shmid", 0) == 1) { - struct ltt_trace_struct *trace; - char trace_name[] = "auto"; - int i; - char *channel_name; + end: + return retval; +} - DBG("get_shmid"); - channel_name = nth_token(recvbuf, 1); - if(channel_name == NULL) { - ERR("get_shmid: cannot parse channel"); - goto next_cmd; - } +static int do_cmd_get_buffer_fd(const char *recvbuf, int sock) +{ + int retval = 0; + struct ust_trace *trace; + char trace_name[] = "auto"; + int i; + char *channel_and_cpu; + int found = 0; + char *ch_name; + int ch_cpu; + struct ustcomm_header header; + + DBG("get_buffer_fd"); + + channel_and_cpu = nth_token(recvbuf, 1); + if (channel_and_cpu == NULL) { + ERR("cannot parse channel"); + retval = -1; + goto end; + } - ltt_lock_traces(); - trace = _ltt_trace_find(trace_name); - ltt_unlock_traces(); + seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); + if (ch_cpu == -1) { + ERR("problem parsing channel name"); + retval = -1; + goto free_short_chan_name; + } - if(trace == NULL) { - ERR("cannot find trace!"); - return (void *)1; - } + ltt_lock_traces(); + trace = _ltt_trace_find(trace_name); - for(i=0; inr_channels; i++) { - struct rchan *rchan = trace->channels[i].trans_channel_data; - struct rchan_buf *rbuf = rchan->buf; - struct ltt_channel_struct *ltt_channel = (struct ltt_channel_struct *)rchan->private_data; + if (trace == NULL) { + int result; - if(!strcmp(trace->channels[i].channel_name, channel_name)) { - char *reply; + DBG("Cannot find trace. It was likely destroyed by the user."); + result = ustcomm_send_reply("NOTFOUND", sock); + if (result) { + ERR("ustcomm_send_reply failed"); + retval = -1; + goto unlock_traces; + } + + goto unlock_traces; + } - DBG("the shmid for the requested channel is %d", rbuf->shmid); - DBG("the shmid for its buffer structure is %d", ltt_channel->buf_shmid); - asprintf(&reply, "%d %d", rbuf->shmid, ltt_channel->buf_shmid); + for (i=0; inr_channels; i++) { + struct ust_channel *channel = &trace->channels[i]; - result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); - if(result) { - ERR("listener: get_shmid: ustcomm_send_reply failed"); - goto next_cmd; - } + if (!strcmp(trace->channels[i].channel_name, ch_name)) { + struct ust_buffer *buf = channel->buf[ch_cpu]; - free(reply); + found = 1; - break; - } + header.size = 0; + header.fd_included = 1; + if (ustcomm_send_fd(sock, &header, NULL, + &buf->data_ready_fd_read) <= 0) { + ERR("ustcomm_send_fd failed\n"); + goto unlock_traces; } - buffers_to_export--; + /* Being here is the proof the daemon has mapped the buffer in its + * memory. We may now decrement buffers_to_export. + */ + if (uatomic_read(&buf->consumed) == 0) { + DBG("decrementing buffers_to_export"); + STORE_SHARED(buffers_to_export, LOAD_SHARED(buffers_to_export)-1); + } + + /* The buffer has been exported, ergo, we can add it to the + * list of open buffers + */ + list_add(&buf->open_buffers_list, &open_buffers_list); + break; } - else if(nth_token_is(recvbuf, "get_n_subbufs", 0) == 1) { - struct ltt_trace_struct *trace; - char trace_name[] = "auto"; - int i; - char *channel_name; + } + if (found == 0) { + ERR("unable to find channel"); + } - DBG("get_n_subbufs"); + unlock_traces: + ltt_unlock_traces(); - channel_name = nth_token(recvbuf, 1); - if(channel_name == NULL) { - ERR("get_n_subbufs: cannot parse channel"); - goto next_cmd; - } + free_short_chan_name: + free(ch_name); - ltt_lock_traces(); - trace = _ltt_trace_find(trace_name); - ltt_unlock_traces(); + end: + return retval; +} - if(trace == NULL) { - ERR("cannot find trace!"); - return (void *)1; - } +static int do_cmd_put_subbuffer(const char *recvbuf, int sock) +{ + int retval = 0; + struct ust_trace *trace; + char trace_name[] = "auto"; + int i; + char *channel_and_cpu; + int found = 0; + int result; + char *ch_name; + int ch_cpu; + long consumed_old; + char *consumed_old_str; + char *endptr; + char *reply = NULL; + + DBG("put_subbuf"); + + channel_and_cpu = strdup(nth_token(recvbuf, 1)); + if (channel_and_cpu == NULL) { + ERR("cannot parse channel"); + retval = -1; + goto end; + } - for(i=0; inr_channels; i++) { - struct rchan *rchan = trace->channels[i].trans_channel_data; + consumed_old_str = strdup(nth_token(recvbuf, 2)); + if (consumed_old_str == NULL) { + ERR("cannot parse consumed_old"); + retval = -1; + goto free_channel_and_cpu; + } + consumed_old = strtol(consumed_old_str, &endptr, 10); + if (*endptr != '\0') { + ERR("invalid value for consumed_old"); + retval = -1; + goto free_consumed_old_str; + } + + seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); + if (ch_cpu == -1) { + ERR("problem parsing channel name"); + retval = -1; + goto free_short_chan_name; + } + + ltt_lock_traces(); + trace = _ltt_trace_find(trace_name); + + if (trace == NULL) { + DBG("Cannot find trace. It was likely destroyed by the user."); + result = ustcomm_send_reply("NOTFOUND", sock); + if (result) { + ERR("ustcomm_send_reply failed"); + retval = -1; + goto unlock_traces; + } - if(!strcmp(trace->channels[i].channel_name, channel_name)) { - char *reply; + goto unlock_traces; + } - DBG("the n_subbufs for the requested channel is %zd", rchan->n_subbufs); - asprintf(&reply, "%zd", rchan->n_subbufs); + for (i=0; inr_channels; i++) { + struct ust_channel *channel = &trace->channels[i]; - result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); - if(result) { - ERR("listener: get_n_subbufs: ustcomm_send_reply failed"); - goto next_cmd; - } + if (!strcmp(trace->channels[i].channel_name, ch_name)) { + struct ust_buffer *buf = channel->buf[ch_cpu]; - free(reply); + found = 1; - break; + result = ust_buffers_put_subbuf(buf, consumed_old); + if (result < 0) { + WARN("ust_buffers_put_subbuf: error (subbuf=%s)", channel_and_cpu); + if (asprintf(&reply, "%s", "ERROR") < 0) { + ERR("do_cmd_put_subbuffer : asprintf failed (ERROR)"); + retval = -1; + goto unlock_traces; + } + } else { + DBG("ust_buffers_put_subbuf: success (subbuf=%s)", channel_and_cpu); + if (asprintf(&reply, "%s", "OK") < 0) { + ERR("do_cmd_put_subbuffer : asprintf failed (OK)"); + retval = -1; + goto unlock_traces; } } - } - else if(nth_token_is(recvbuf, "get_subbuf_size", 0) == 1) { - struct ltt_trace_struct *trace; - char trace_name[] = "auto"; - int i; - char *channel_name; - - DBG("get_subbuf_size"); - channel_name = nth_token(recvbuf, 1); - if(channel_name == NULL) { - ERR("get_subbuf_size: cannot parse channel"); - goto next_cmd; + result = ustcomm_send_reply(reply, sock); + if (result) { + ERR("ustcomm_send_reply failed"); + free(reply); + retval = -1; + goto unlock_traces; } - ltt_lock_traces(); - trace = _ltt_trace_find(trace_name); - ltt_unlock_traces(); + free(reply); + break; + } + } + if (found == 0) { + ERR("unable to find channel"); + } - if(trace == NULL) { - ERR("cannot find trace!"); - return (void *)1; - } + unlock_traces: + ltt_unlock_traces(); + free_short_chan_name: + free(ch_name); + free_consumed_old_str: + free(consumed_old_str); + free_channel_and_cpu: + free(channel_and_cpu); + + end: + return retval; +} - for(i=0; inr_channels; i++) { - struct rchan *rchan = trace->channels[i].trans_channel_data; +static void listener_cleanup(void *ptr) +{ + ustcomm_del_named_sock(listen_sock, 0); +} - if(!strcmp(trace->channels[i].channel_name, channel_name)) { - char *reply; +static void do_cmd_force_switch() +{ + struct ust_buffer *buf; - DBG("the subbuf_size for the requested channel is %zd", rchan->subbuf_size); - asprintf(&reply, "%zd", rchan->subbuf_size); + list_for_each_entry(buf, &open_buffers_list, + open_buffers_list) { + ltt_force_switch(buf, FORCE_FLUSH); + } +} - result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); - if(result) { - ERR("listener: get_subbuf_size: ustcomm_send_reply failed"); - goto next_cmd; - } +static int process_client_cmd(char *recvbuf, int sock) +{ + int result; + char trace_name[] = "auto"; + char trace_type[] = "ustrelay"; + int len; + + len = strlen(recvbuf); + + if (!strcmp(recvbuf, "print_markers")) { + print_markers(stderr); + } else if (!strcmp(recvbuf, "list_markers")) { + char *ptr; + size_t size; + FILE *fp; + + fp = open_memstream(&ptr, &size); + print_markers(fp); + fclose(fp); + + result = ustcomm_send_reply(ptr, sock); + + free(ptr); + } else if (!strcmp(recvbuf, "print_trace_events")) { + print_trace_events(stderr); + + } else if (!strcmp(recvbuf, "list_trace_events")) { + char *ptr; + size_t size; + FILE *fp; + + fp = open_memstream(&ptr, &size); + if (fp == NULL) { + ERR("opening memstream failed"); + return -1; + } + print_trace_events(fp); + fclose(fp); - free(reply); + result = ustcomm_send_reply(ptr, sock); + if (result < 0) { + ERR("list_trace_events failed"); + return -1; + } + free(ptr); + } else if (!strcmp(recvbuf, "start")) { + /* start is an operation that setups the trace, allocates it and starts it */ + result = ltt_trace_setup(trace_name); + if (result < 0) { + ERR("ltt_trace_setup failed"); + return -1; + } - break; - } - } + result = ltt_trace_set_type(trace_name, trace_type); + if (result < 0) { + ERR("ltt_trace_set_type failed"); + return -1; + } + + result = ltt_trace_alloc(trace_name); + if (result < 0) { + ERR("ltt_trace_alloc failed"); + return -1; } - else if(nth_token_is(recvbuf, "load_probe_lib", 0) == 1) { - char *libfile; - libfile = nth_token(recvbuf, 1); + inform_consumer_daemon(trace_name); - DBG("load_probe_lib loading %s", libfile); + result = ltt_trace_start(trace_name); + if (result < 0) { + ERR("ltt_trace_start failed"); + return -1; } - else if(nth_token_is(recvbuf, "get_subbuffer", 0) == 1) { - struct ltt_trace_struct *trace; - char trace_name[] = "auto"; - int i; - char *channel_name; + } else if (!strcmp(recvbuf, "trace_setup")) { + DBG("trace setup"); - DBG("get_subbuf"); + result = ltt_trace_setup(trace_name); + if (result < 0) { + ERR("ltt_trace_setup failed"); + return -1; + } - channel_name = nth_token(recvbuf, 1); - if(channel_name == NULL) { - ERR("get_subbuf: cannot parse channel"); - goto next_cmd; - } + result = ltt_trace_set_type(trace_name, trace_type); + if (result < 0) { + ERR("ltt_trace_set_type failed"); + return -1; + } + } else if (!strcmp(recvbuf, "trace_alloc")) { + DBG("trace alloc"); - ltt_lock_traces(); - trace = _ltt_trace_find(trace_name); - ltt_unlock_traces(); + result = ltt_trace_alloc(trace_name); + if (result < 0) { + ERR("ltt_trace_alloc failed"); + return -1; + } + inform_consumer_daemon(trace_name); + } else if (!strcmp(recvbuf, "trace_create")) { + DBG("trace create"); - if(trace == NULL) { - ERR("cannot find trace!"); - return (void *)1; - } + result = ltt_trace_setup(trace_name); + if (result < 0) { + ERR("ltt_trace_setup failed"); + return -1; + } - for(i=0; inr_channels; i++) { - struct rchan *rchan = trace->channels[i].trans_channel_data; - - if(!strcmp(trace->channels[i].channel_name, channel_name)) { - struct rchan_buf *rbuf = rchan->buf; - struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf; - struct blocked_consumer *bc; - - bc = (struct blocked_consumer *) malloc(sizeof(struct blocked_consumer)); - if(bc == NULL) { - ERR("malloc returned NULL"); - goto next_cmd; - } - bc->fd_consumer = src.fd; - bc->fd_producer = lttbuf->data_ready_fd_read; - bc->rbuf = rbuf; - bc->lttbuf = lttbuf; - bc->src = src; - bc->server = ustcomm_app.server; - - list_add(&bc->list, &blocked_consumers); - - break; - } - } + result = ltt_trace_set_type(trace_name, trace_type); + if (result < 0) { + ERR("ltt_trace_set_type failed"); + return -1; } - else if(nth_token_is(recvbuf, "put_subbuffer", 0) == 1) { - struct ltt_trace_struct *trace; - char trace_name[] = "auto"; - int i; - char *channel_name; - long consumed_old; - char *consumed_old_str; - char *endptr; - - DBG("put_subbuf"); - - channel_name = strdup_malloc(nth_token(recvbuf, 1)); - if(channel_name == NULL) { - ERR("put_subbuf_size: cannot parse channel"); - goto next_cmd; - } + } else if (!strcmp(recvbuf, "trace_start")) { + DBG("trace start"); - consumed_old_str = strdup_malloc(nth_token(recvbuf, 2)); - if(consumed_old_str == NULL) { - ERR("put_subbuf: cannot parse consumed_old"); - goto next_cmd; - } - consumed_old = strtol(consumed_old_str, &endptr, 10); - if(*endptr != '\0') { - ERR("put_subbuf: invalid value for consumed_old"); - goto next_cmd; - } + result = ltt_trace_alloc(trace_name); + if (result < 0) { + ERR("ltt_trace_alloc failed"); + return -1; + } + if (!result) { + inform_consumer_daemon(trace_name); + } - ltt_lock_traces(); - trace = _ltt_trace_find(trace_name); - ltt_unlock_traces(); + result = ltt_trace_start(trace_name); + if (result < 0) { + ERR("ltt_trace_start failed"); + return -1; + } + } else if (!strcmp(recvbuf, "trace_stop")) { + DBG("trace stop"); - if(trace == NULL) { - ERR("cannot find trace!"); - return (void *)1; - } + result = ltt_trace_stop(trace_name); + if (result < 0) { + ERR("ltt_trace_stop failed"); + return -1; + } + } else if (!strcmp(recvbuf, "trace_destroy")) { - for(i=0; inr_channels; i++) { - struct rchan *rchan = trace->channels[i].trans_channel_data; - - if(!strcmp(trace->channels[i].channel_name, channel_name)) { - struct rchan_buf *rbuf = rchan->buf; - struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf; - char *reply; - long consumed_old=0; - - result = ltt_do_put_subbuf(rbuf, lttbuf, consumed_old); - if(result < 0) { - WARN("ltt_do_put_subbuf: error (subbuf=%s)", channel_name); - asprintf(&reply, "%s", "ERROR"); - } - else { - DBG("ltt_do_put_subbuf: success (subbuf=%s)", channel_name); - asprintf(&reply, "%s", "OK"); - } - - result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); - if(result) { - ERR("listener: put_subbuf: ustcomm_send_reply failed"); - goto next_cmd; - } - - free(reply); - - break; - } - } + DBG("trace destroy"); + result = ltt_trace_destroy(trace_name, 0); + if (result < 0) { + ERR("ltt_trace_destroy failed"); + return -1; + } + } else if (nth_token_is(recvbuf, "get_shmid", 0) == 1) { + do_cmd_get_shmid(recvbuf, sock); + } else if (nth_token_is(recvbuf, "get_n_subbufs", 0) == 1) { + do_cmd_get_n_subbufs(recvbuf, sock); + } else if (nth_token_is(recvbuf, "get_subbuf_size", 0) == 1) { + do_cmd_get_subbuf_size(recvbuf, sock); + } else if (nth_token_is(recvbuf, "load_probe_lib", 0) == 1) { + char *libfile; + + libfile = nth_token(recvbuf, 1); + + DBG("load_probe_lib loading %s", libfile); + + free(libfile); + } else if (nth_token_is(recvbuf, "get_subbuffer", 0) == 1) { + do_cmd_get_subbuffer(recvbuf, sock); + } + else if(nth_token_is(recvbuf, "get_buffer_fd", 0) == 1) { + do_cmd_get_buffer_fd(recvbuf, sock); + } + else if(nth_token_is(recvbuf, "put_subbuffer", 0) == 1) { + do_cmd_put_subbuffer(recvbuf, sock); + } else if (nth_token_is(recvbuf, "set_subbuf_size", 0) == 1) { + do_cmd_set_subbuf_size(recvbuf, sock); + } else if (nth_token_is(recvbuf, "set_subbuf_num", 0) == 1) { + do_cmd_set_subbuf_num(recvbuf, sock); + } else if (nth_token_is(recvbuf, "enable_marker", 0) == 1) { + char *channel_slash_name = nth_token(recvbuf, 1); + char *channel_name = NULL; + char *marker_name = NULL; + + result = sscanf(channel_slash_name, "%a[^/]/%as", &channel_name, &marker_name); + + if (channel_name == NULL || marker_name == NULL) { + WARN("invalid marker name"); free(channel_name); - free(consumed_old_str); + free(marker_name); + goto next_cmd; } - else if(nth_token_is(recvbuf, "enable_marker", 0) == 1) { - char *channel_slash_name = nth_token(recvbuf, 1); - char channel_name[256]=""; - char marker_name[256]=""; - result = sscanf(channel_slash_name, "%255[^/]/%255s", channel_name, marker_name); + result = ltt_marker_connect(channel_name, marker_name, "default"); + if (result < 0) { + WARN("could not enable marker; channel=%s, name=%s", channel_name, marker_name); + } - if(channel_name == NULL || marker_name == NULL) { - WARN("invalid marker name"); - goto next_cmd; - } - printf("%s %s\n", channel_name, marker_name); + free(channel_name); + free(marker_name); + } else if (nth_token_is(recvbuf, "disable_marker", 0) == 1) { + char *channel_slash_name = nth_token(recvbuf, 1); + char *marker_name = NULL; + char *channel_name = NULL; - result = ltt_marker_connect(channel_name, marker_name, "default"); - if(result < 0) { - WARN("could not enable marker; channel=%s, name=%s", channel_name, marker_name); - } + result = sscanf(channel_slash_name, "%a[^/]/%as", &channel_name, &marker_name); + + if (channel_name == NULL || marker_name == NULL) { + WARN("invalid marker name"); + free(channel_name); + free(marker_name); + goto next_cmd; } - else if(nth_token_is(recvbuf, "disable_marker", 0) == 1) { - char *channel_slash_name = nth_token(recvbuf, 1); - char *marker_name; - char *channel_name; - result = sscanf(channel_slash_name, "%a[^/]/%as", &channel_name, &marker_name); + result = ltt_marker_disconnect(channel_name, marker_name, "default"); + if (result < 0) { + WARN("could not disable marker; channel=%s, name=%s", channel_name, marker_name); + } - if(marker_name == NULL) { - } - printf("%s %s\n", channel_name, marker_name); + free(channel_name); + free(marker_name); + } else if (nth_token_is(recvbuf, "get_pidunique", 0) == 1) { + char *reply; - result = ltt_marker_disconnect(channel_name, marker_name, "default"); - if(result < 0) { - WARN("could not disable marker; channel=%s, name=%s", channel_name, marker_name); - } + if (asprintf(&reply, "%lld", pidunique) < 0) { + ERR("process_client_cmd : asprintf failed (%lld)", + pidunique); + goto next_cmd; } - else if(nth_token_is(recvbuf, "get_pidunique", 0) == 1) { - char *reply; - asprintf(&reply, "%lld", pidunique); + result = ustcomm_send_reply(reply, sock); + if (result) { + ERR("listener: get_pidunique: ustcomm_send_reply failed"); + goto next_cmd; + } - result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); - if(result) { - ERR("listener: get_pidunique: ustcomm_send_reply failed"); + free(reply); + } else if (nth_token_is(recvbuf, "get_sock_path", 0) == 1) { + char *reply = getenv("UST_DAEMON_SOCKET"); + if (!reply) { + if (asprintf(&reply, "%s/%s", SOCK_DIR, "ustd") < 0) { + ERR("process_client_cmd : asprintf failed (%s/ustd)", + SOCK_DIR); goto next_cmd; } - + result = ustcomm_send_reply(reply, sock); free(reply); + } else { + result = ustcomm_send_reply(reply, sock); } -// else if(nth_token_is(recvbuf, "get_notifications", 0) == 1) { -// struct ltt_trace_struct *trace; -// char trace_name[] = "auto"; -// int i; -// char *channel_name; -// -// DBG("get_notifications"); -// -// channel_name = strdup_malloc(nth_token(recvbuf, 1)); -// if(channel_name == NULL) { -// ERR("put_subbuf_size: cannot parse channel"); -// goto next_cmd; -// } -// -// ltt_lock_traces(); -// trace = _ltt_trace_find(trace_name); -// ltt_unlock_traces(); -// -// if(trace == NULL) { -// ERR("cannot find trace!"); -// return (void *)1; -// } -// -// for(i=0; inr_channels; i++) { -// struct rchan *rchan = trace->channels[i].trans_channel_data; -// int fd; -// -// if(!strcmp(trace->channels[i].channel_name, channel_name)) { -// struct rchan_buf *rbuf = rchan->buf; -// struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf; -// -// result = fd = ustcomm_app_detach_client(&ustcomm_app, &src); -// if(result == -1) { -// ERR("ustcomm_app_detach_client failed"); -// goto next_cmd; -// } -// -// lttbuf->wake_consumer_arg = (void *) fd; -// -// smp_wmb(); -// -// lttbuf->call_wake_consumer = 1; -// -// break; -// } -// } -// -// free(channel_name); -// } - else { - ERR("unable to parse message: %s", recvbuf); - } - - next_cmd: - free(recvbuf); + if (result) + ERR("ustcomm_send_reply failed"); + } else if (nth_token_is(recvbuf, "set_sock_path", 0) == 1) { + char *sock_path = nth_token(recvbuf, 1); + result = setenv("UST_DAEMON_SOCKET", sock_path, 1); + if (result) + ERR("cannot set UST_DAEMON_SOCKET environment variable"); + } else if (nth_token_is(recvbuf, "force_switch", 0) == 1) { + do_cmd_force_switch(); + } else { + ERR("unable to parse message: %s", recvbuf); } -} -volatile sig_atomic_t have_listener = 0; +next_cmd: -void create_listener(void) -{ -#ifdef USE_CLONE - static char listener_stack[16384]; -#else - pthread_t thread; -#endif + return 0; +} - if(have_listener) - return; +#define MAX_EVENTS 10 -#ifdef USE_CLONE - result = clone(listener_main, listener_stack+sizeof(listener_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD, NULL); - if(result == -1) { - perror("clone"); - return; - } -#else - - pthread_create(&thread, NULL, listener_main, NULL); -#endif +void *listener_main(void *p) +{ + struct ustcomm_sock *epoll_sock; + struct epoll_event events[MAX_EVENTS]; + struct sockaddr addr; + int accept_fd, nfds, result, i, addr_size; - have_listener = 1; -} + DBG("LISTENER"); -/* The signal handler itself. Signals must be setup so there cannot be - nested signals. */ + pthread_cleanup_push(listener_cleanup, NULL); -void sighandler(int sig) -{ - DBG("sighandler"); + for(;;) { + nfds = epoll_wait(epoll_fd, events, MAX_EVENTS, -1); + if (nfds == -1) { + PERROR("listener_main: epoll_wait failed"); + continue; + } - if(!have_listener) { - create_listener(); + for (i = 0; i < nfds; i++) { + epoll_sock = (struct ustcomm_sock *)events[i].data.ptr; + if (epoll_sock == listen_sock) { + addr_size = sizeof(struct sockaddr); + accept_fd = accept(epoll_sock->fd, + &addr, + (socklen_t *)&addr_size); + if (accept_fd == -1) { + PERROR("listener_main: accept failed"); + continue; + } + ustcomm_init_sock(accept_fd, epoll_fd, + &ust_socks); + } else { + char *msg = NULL; + result = recv_message_conn(epoll_sock->fd, &msg); + if (result == 0) { + ustcomm_del_sock(epoll_sock, 0); + } else if (msg) { + process_client_cmd(msg, epoll_sock->fd); + free(msg); + } + } + } } + + pthread_cleanup_pop(1); } -/* Called by the app signal handler to chain it to us. */ +/* These should only be accessed in the parent thread, + * not the listener. + */ +static volatile sig_atomic_t have_listener = 0; +static pthread_t listener_thread; -void chain_signal(void) +void create_listener(void) { - sighandler(USTSIGNAL); -} + int result; + sigset_t sig_all_blocked; + sigset_t orig_parent_mask; -static int init_socket(void) -{ - return ustcomm_init_app(getpid(), &ustcomm_app); -} + if (have_listener) { + WARN("not creating listener because we already had one"); + return; + } -static int init_signal_handler(void) -{ - /* Attempt to handler SIGIO. If the main program wants to - * handle it, fine, it'll override us. They it'll have to - * use the chaining function. + /* A new thread created by pthread_create inherits the signal mask + * from the parent. To avoid any signal being received by the + * listener thread, we block all signals temporarily in the parent, + * while we create the listener thread. */ - int result; - struct sigaction act; + sigfillset(&sig_all_blocked); - result = sigemptyset(&act.sa_mask); - if(result == -1) { - PERROR("sigemptyset"); - return -1; + result = pthread_sigmask(SIG_SETMASK, &sig_all_blocked, &orig_parent_mask); + if (result) { + PERROR("pthread_sigmask: %s", strerror(result)); } - act.sa_handler = sighandler; - act.sa_flags = SA_RESTART; - - /* Only defer ourselves. Also, try to restart interrupted - * syscalls to disturb the traced program as little as possible. - */ - result = sigaction(SIGIO, &act, NULL); - if(result == -1) { - PERROR("sigaction"); - return -1; + result = pthread_create(&listener_thread, NULL, listener_main, NULL); + if (result == -1) { + PERROR("pthread_create"); } - return 0; + /* Restore original signal mask in parent */ + result = pthread_sigmask(SIG_SETMASK, &orig_parent_mask, NULL); + if (result) { + PERROR("pthread_sigmask: %s", strerror(result)); + } else { + have_listener = 1; + } } #define AUTOPROBE_DISABLED 0 @@ -867,12 +1232,11 @@ static void auto_probe_connect(struct marker *m) char* concat_name = NULL; const char *probe_name = "default"; - if(autoprobe_method == AUTOPROBE_DISABLED) { + if (autoprobe_method == AUTOPROBE_DISABLED) { return; - } - else if(autoprobe_method == AUTOPROBE_ENABLE_REGEX) { + } else if (autoprobe_method == AUTOPROBE_ENABLE_REGEX) { result = asprintf(&concat_name, "%s/%s", m->channel, m->name); - if(result == -1) { + if (result == -1) { ERR("auto_probe_connect: asprintf failed (marker %s/%s)", m->channel, m->name); return; @@ -885,46 +1249,84 @@ static void auto_probe_connect(struct marker *m) } result = ltt_marker_connect(m->channel, m->name, probe_name); - if(result && result != -EEXIST) + if (result && result != -EEXIST) ERR("ltt_marker_connect (marker = %s/%s, errno = %d)", m->channel, m->name, -result); - DBG("auto connected marker %s %s to probe default", m->channel, m->name); + DBG("auto connected marker %s (addr: %p) %s to probe default", m->channel, m, m->name); + +} + +static struct ustcomm_sock * init_app_socket(int epoll_fd) +{ + char *name; + int result; + struct ustcomm_sock *sock; + + result = asprintf(&name, "%s/%d", SOCK_DIR, (int)getpid()); + if (result < 0) { + ERR("string overflow allocating socket name, " + "UST thread bailing"); + return NULL; + } + + result = ensure_dir_exists(SOCK_DIR); + if (result == -1) { + ERR("Unable to create socket directory %s, UST thread bailing", + SOCK_DIR); + goto free_name; + } + + sock = ustcomm_init_named_socket(name, epoll_fd); + if (!sock) { + ERR("Error initializing named socket (%s). Check that directory" + "exists and that it is writable. UST thread bailing", name); + goto free_name; + } + + free(name); + return sock; +free_name: + free(name); + return NULL; } -static void __attribute__((constructor(1000))) init() +static void __attribute__((constructor)) init() { int result; char* autoprobe_val = NULL; + char* subbuffer_size_val = NULL; + char* subbuffer_count_val = NULL; + unsigned int subbuffer_size; + unsigned int subbuffer_count; + unsigned int power; /* Assign the pidunique, to be able to differentiate the processes with same * pid, (before and after an exec). */ pidunique = make_pidunique(); - /* Initialize RCU in case the constructor order is not good. */ - urcu_init(); - - /* It is important to do this before events start to be generated. */ - ust_register_thread(); - DBG("Tracectl constructor"); - /* Must create socket before signal handler to prevent races. - */ - result = init_socket(); - if(result == -1) { - ERR("init_socket error"); + /* Set up epoll */ + epoll_fd = epoll_create(MAX_EVENTS); + if (epoll_fd == -1) { + ERR("epoll_create failed, tracing shutting down"); return; } - result = init_signal_handler(); - if(result == -1) { - ERR("init_signal_handler error"); + + /* Create the socket */ + listen_sock = init_app_socket(epoll_fd); + if (!listen_sock) { + ERR("failed to create application socket," + " tracing shutting down"); return; } + create_listener(); + autoprobe_val = getenv("UST_AUTOPROBE"); - if(autoprobe_val) { + if (autoprobe_val) { struct marker_iter iter; DBG("Autoprobe enabled."); @@ -938,7 +1340,7 @@ static void __attribute__((constructor(1000))) init() /* first, set the callback that will connect the * probe on new markers */ - if(autoprobe_val[0] == '/') { + if (autoprobe_val[0] == '/') { result = regcomp(&autoprobe_regex, autoprobe_val+1, 0); if (result) { char regexerr[150]; @@ -946,12 +1348,10 @@ static void __attribute__((constructor(1000))) init() regerror(result, &autoprobe_regex, regexerr, sizeof(regexerr)); ERR("cannot parse regex %s (%s), will ignore UST_AUTOPROBE", autoprobe_val, regexerr); /* don't crash the application just for this */ - } - else { + } else { autoprobe_method = AUTOPROBE_ENABLE_REGEX; } - } - else { + } else { /* just enable all instrumentation */ autoprobe_method = AUTOPROBE_ENABLE_ALL; } @@ -963,14 +1363,49 @@ static void __attribute__((constructor(1000))) init() marker_iter_start(&iter); DBG("now iterating on markers already registered"); - while(iter.marker) { + while (iter.marker) { DBG("now iterating on marker %s", iter.marker->name); auto_probe_connect(iter.marker); marker_iter_next(&iter); } } - if(getenv("UST_TRACE")) { + if (getenv("UST_OVERWRITE")) { + int val = atoi(getenv("UST_OVERWRITE")); + if (val == 0 || val == 1) { + STORE_SHARED(ust_channels_overwrite_by_default, val); + } else { + WARN("invalid value for UST_OVERWRITE"); + } + } + + if (getenv("UST_AUTOCOLLECT")) { + int val = atoi(getenv("UST_AUTOCOLLECT")); + if (val == 0 || val == 1) { + STORE_SHARED(ust_channels_request_collection_by_default, val); + } else { + WARN("invalid value for UST_AUTOCOLLECT"); + } + } + + subbuffer_size_val = getenv("UST_SUBBUF_SIZE"); + if (subbuffer_size_val) { + sscanf(subbuffer_size_val, "%u", &subbuffer_size); + power = pow2_higher_or_eq(subbuffer_size); + if (power != subbuffer_size) + WARN("using the next power of two for buffer size = %u\n", power); + chan_infos[LTT_CHANNEL_UST].def_subbufsize = power; + } + + subbuffer_count_val = getenv("UST_SUBBUF_NUM"); + if (subbuffer_count_val) { + sscanf(subbuffer_count_val, "%u", &subbuffer_count); + if (subbuffer_count < 2) + subbuffer_count = 2; + chan_infos[LTT_CHANNEL_UST].def_subbufcount = subbuffer_count; + } + + if (getenv("UST_TRACE")) { char trace_name[] = "auto"; char trace_type[] = "ustrelay"; @@ -979,35 +1414,54 @@ static void __attribute__((constructor(1000))) init() /* Ensure marker control is initialized */ init_marker_control(); - /* Ensure relay is initialized */ - init_ustrelay_transport(); - /* Ensure markers are initialized */ init_markers(); - /* In case. */ + /* Ensure buffers are initialized, for the transport to be available. + * We are about to set a trace type and it will fail without this. + */ + init_ustrelay_transport(); + + /* FIXME: When starting early tracing (here), depending on the + * order of constructors, it is very well possible some marker + * sections are not yet registered. Because of this, some + * channels may not be registered. Yet, we are about to ask the + * daemon to collect the channels. Channels which are not yet + * registered will not be collected. + * + * Currently, in LTTng, there is no way to add a channel after + * trace start. The reason for this is that it induces complex + * concurrency issues on the trace structures, which can only + * be resolved using RCU. This has not been done yet. As a + * workaround, we are forcing the registration of the "ust" + * channel here. This is the only channel (apart from metadata) + * that can be reliably used in early tracing. + * + * Non-early tracing does not have this problem and can use + * arbitrary channel names. + */ ltt_channels_register("ust"); result = ltt_trace_setup(trace_name); - if(result < 0) { + if (result < 0) { ERR("ltt_trace_setup failed"); return; } result = ltt_trace_set_type(trace_name, trace_type); - if(result < 0) { + if (result < 0) { ERR("ltt_trace_set_type failed"); return; } result = ltt_trace_alloc(trace_name); - if(result < 0) { + if (result < 0) { ERR("ltt_trace_alloc failed"); return; } result = ltt_trace_start(trace_name); - if(result < 0) { + if (result < 0) { ERR("ltt_trace_start failed"); return; } @@ -1017,7 +1471,6 @@ static void __attribute__((constructor(1000))) init() inform_consumer_daemon(trace_name); } - return; /* should decrementally destroy stuff if error */ @@ -1044,12 +1497,12 @@ static void destroy_traces(void) DBG("destructor stopping traces"); result = ltt_trace_stop("auto"); - if(result == -1) { + if (result == -1) { ERR("ltt_trace_stop error"); } - result = ltt_trace_destroy("auto"); - if(result == -1) { + result = ltt_trace_destroy("auto", 0); + if (result == -1) { ERR("ltt_trace_destroy error"); } } @@ -1057,12 +1510,12 @@ static void destroy_traces(void) static int trace_recording(void) { int retval = 0; - struct ltt_trace_struct *trace; + struct ust_trace *trace; ltt_lock_traces(); list_for_each_entry(trace, <t_traces.head, list) { - if(trace->active) { + if (trace->active) { retval = 1; break; } @@ -1073,13 +1526,6 @@ static int trace_recording(void) return retval; } -#if 0 -static int have_consumer(void) -{ - return !list_empty(&blocked_consumers); -} -#endif - int restarting_usleep(useconds_t usecs) { struct timespec tv; @@ -1089,12 +1535,29 @@ int restarting_usleep(useconds_t usecs) tv.tv_nsec = usecs * 1000; do { - result = nanosleep(&tv, &tv); - } while(result == -1 && errno == EINTR); + result = nanosleep(&tv, &tv); + } while (result == -1 && errno == EINTR); return result; } +static void stop_listener(void) +{ + int result; + + if (!have_listener) + return; + + result = pthread_cancel(listener_thread); + if (result != 0) { + ERR("pthread_cancel: %s", strerror(result)); + } + result = pthread_join(listener_thread, NULL); + if (result != 0) { + ERR("pthread_join: %s", strerror(result)); + } +} + /* This destructor keeps the process alive for a few seconds in order * to leave time to ustd to connect to its buffers. This is necessary * for programs whose execution is very short. It is also useful in all @@ -1107,15 +1570,15 @@ int restarting_usleep(useconds_t usecs) static void __attribute__((destructor)) keepalive() { - if(trace_recording() && buffers_to_export) { + if (trace_recording() && LOAD_SHARED(buffers_to_export)) { int total = 0; DBG("Keeping process alive for consumer daemon..."); - while(buffers_to_export) { + while (LOAD_SHARED(buffers_to_export)) { const int interv = 200000; restarting_usleep(interv); total += interv; - if(total >= 3000000) { + if (total >= 3000000) { WARN("non-consumed buffers remaining after wait limit; not waiting anymore"); break; } @@ -1125,13 +1588,16 @@ static void __attribute__((destructor)) keepalive() destroy_traces(); - ustcomm_fini_app(&ustcomm_app); + /* Ask the listener to stop and clean up. */ + stop_listener(); } void ust_potential_exec(void) { trace_mark(ust, potential_exec, MARK_NOARGS); + DBG("test"); + keepalive(); } @@ -1139,35 +1605,71 @@ void ust_potential_exec(void) * the new process, anytime a process whose memory is not shared with * the parent is created. If this function is not called, the events * of the new process will not be collected. + * + * Signals should be disabled before the fork and reenabled only after + * this call in order to guarantee tracing is not started before ust_fork() + * sanitizes the new process. */ -void ust_fork(void) +static void ust_fork(void) { - struct blocked_consumer *bc; - struct blocked_consumer *deletable_bc = NULL; + struct ust_buffer *buf, *buf_tmp; + struct ustcomm_sock *sock, *sock_tmp; int result; + /* FIXME: technically, the locks could have been taken before the fork */ DBG("ust: forking"); + + /* break lock if necessary */ + ltt_unlock_traces(); + ltt_trace_stop("auto"); - ltt_trace_destroy("auto"); - /* Delete all active connections */ - ustcomm_close_all_connections(&ustcomm_app.server); + ltt_trace_destroy("auto", 1); + /* Delete all active connections, but leave them in the epoll set */ + list_for_each_entry_safe(sock, sock_tmp, &ust_socks, list) { + ustcomm_del_sock(sock, 1); + } /* Delete all blocked consumers */ - list_for_each_entry(bc, &blocked_consumers, list) { - close(bc->fd_producer); - close(bc->fd_consumer); - free(deletable_bc); - deletable_bc = bc; - list_del(&bc->list); + list_for_each_entry_safe(buf, buf_tmp, &open_buffers_list, + open_buffers_list) { + result = close(buf->data_ready_fd_read); + if(result == -1) { + PERROR("close"); + } + result = close(buf->data_ready_fd_write); + if(result == -1) { + PERROR("close"); + } + list_del(&buf->open_buffers_list); } + /* Clean up the listener socket and epoll, keeping the scoket file */ + ustcomm_del_named_sock(listen_sock, 1); + close(epoll_fd); + + /* Re-start the launch sequence */ + STORE_SHARED(buffers_to_export, 0); have_listener = 0; + + /* Set up epoll */ + epoll_fd = epoll_create(MAX_EVENTS); + if (epoll_fd == -1) { + ERR("epoll_create failed, tracing shutting down"); + return; + } + + /* Create the socket */ + listen_sock = init_app_socket(epoll_fd); + if (!listen_sock) { + ERR("failed to create application socket," + " tracing shutting down"); + return; + } create_listener(); - init_socket(); ltt_trace_setup("auto"); result = ltt_trace_set_type("auto", "ustrelay"); - if(result < 0) { + if (result < 0) { ERR("ltt_trace_set_type failed"); return; } @@ -1177,3 +1679,54 @@ void ust_fork(void) inform_consumer_daemon("auto"); } +void ust_before_fork(ust_fork_info_t *fork_info) +{ + /* Disable signals. This is to avoid that the child + * intervenes before it is properly setup for tracing. It is + * safer to disable all signals, because then we know we are not + * breaking anything by restoring the original mask. + */ + sigset_t all_sigs; + int result; + + /* FIXME: + - only do this if tracing is active + */ + + /* Disable signals */ + sigfillset(&all_sigs); + result = sigprocmask(SIG_BLOCK, &all_sigs, &fork_info->orig_sigs); + if (result == -1) { + PERROR("sigprocmask"); + return; + } +} + +/* Don't call this function directly in a traced program */ +static void ust_after_fork_common(ust_fork_info_t *fork_info) +{ + int result; + + /* Restore signals */ + result = sigprocmask(SIG_SETMASK, &fork_info->orig_sigs, NULL); + if (result == -1) { + PERROR("sigprocmask"); + return; + } +} + +void ust_after_fork_parent(ust_fork_info_t *fork_info) +{ + /* Reenable signals */ + ust_after_fork_common(fork_info); +} + +void ust_after_fork_child(ust_fork_info_t *fork_info) +{ + /* First sanitize the child */ + ust_fork(); + + /* Then reenable interrupts */ + ust_after_fork_common(fork_info); +} +