X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=libust%2Ftracectl.c;h=80d09ae093045fa88b6c1fcac8923ced5ef2402b;hb=b5b073e22d34bec71259d39b8946354f170f01a9;hp=412cca2b1cfdb1b4969cbaeb030f170ae871b988;hpb=c472cce0f033b101297cb617af52b4b24e8e8c78;p=ust.git diff --git a/libust/tracectl.c b/libust/tracectl.c index 412cca2..80d09ae 100644 --- a/libust/tracectl.c +++ b/libust/tracectl.c @@ -27,13 +27,13 @@ #include #include -#include +#include -#include "marker.h" +#include #include "tracer.h" -#include "localerr.h" +#include "usterr.h" #include "ustcomm.h" -#include "relay.h" /* FIXME: remove */ +#include "buffers.h" /* FIXME: remove */ #include "marker-control.h" //#define USE_CLONE @@ -46,6 +46,11 @@ 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; @@ -58,10 +63,6 @@ struct tracecmd { /* no padding */ /* 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; @@ -86,13 +87,26 @@ struct blocked_consumer { struct ustcomm_server server; struct ustcomm_source src; - /* args to ltt_do_get_subbuf */ - struct rchan_buf *rbuf; - struct ltt_channel_buf_struct *lttbuf; + /* args to ust_buffers_do_get_subbuf */ + struct ust_buffer *buf; struct list_head list; }; +static long long make_pidunique(void) +{ + s64 retval; + struct timeval tv; + + gettimeofday(&tv, NULL); + + retval = tv.tv_sec; + retval <<= 32; + retval |= tv.tv_usec; + + return retval; +} + static void print_markers(FILE *fp) { struct marker_iter iter; @@ -102,7 +116,7 @@ static void print_markers(FILE *fp) 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); + 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(); @@ -235,13 +249,13 @@ void process_blocked_consumers(void) continue; } - result = ltt_do_get_subbuf(bc->rbuf, bc->lttbuf, &consumed_old); + result = ust_buffers_do_get_subbuf(bc->buf, &consumed_old); if(result == -EAGAIN) { WARN("missed buffer?"); continue; } else if(result < 0) { - DBG("ltt_do_get_subbuf: error: %s", strerror(-result)); + DBG("ust_buffers_do_get_subbuf: error: %s", strerror(-result)); } asprintf(&reply, "%s %ld", "OK", consumed_old); result = ustcomm_send_reply(&bc->server, reply, &bc->src); @@ -408,16 +422,15 @@ void *listener_main(void *p) } 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; + struct ust_channel *channel = &trace->channels[i]; + struct ust_buffer *buf = channel->buf; if(!strcmp(trace->channels[i].channel_name, channel_name)) { char *reply; - 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); + DBG("the shmid for the requested channel is %d", buf->shmid); + DBG("the shmid for its buffer structure is %d", channel->buf_shmid); + asprintf(&reply, "%d %d", buf->shmid, channel->buf_shmid); result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); if(result) { @@ -457,13 +470,13 @@ void *listener_main(void *p) } for(i=0; inr_channels; i++) { - struct rchan *rchan = trace->channels[i].trans_channel_data; + struct ust_channel *channel = &trace->channels[i]; if(!strcmp(trace->channels[i].channel_name, channel_name)) { char *reply; - DBG("the n_subbufs for the requested channel is %zd", rchan->n_subbufs); - asprintf(&reply, "%zd", rchan->n_subbufs); + DBG("the n_subbufs for the requested channel is %d", channel->subbuf_cnt); + asprintf(&reply, "%d", channel->subbuf_cnt); result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); if(result) { @@ -501,13 +514,13 @@ void *listener_main(void *p) } for(i=0; inr_channels; i++) { - struct rchan *rchan = trace->channels[i].trans_channel_data; + struct ust_channel *channel = &trace->channels[i]; if(!strcmp(trace->channels[i].channel_name, channel_name)) { char *reply; - DBG("the subbuf_size for the requested channel is %zd", rchan->subbuf_size); - asprintf(&reply, "%zd", rchan->subbuf_size); + DBG("the subbuf_size for the requested channel is %zd", channel->subbuf_size); + asprintf(&reply, "%zd", channel->subbuf_size); result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); if(result) { @@ -552,11 +565,10 @@ void *listener_main(void *p) } for(i=0; inr_channels; i++) { - struct rchan *rchan = trace->channels[i].trans_channel_data; + struct ust_channel *channel = &trace->channels[i]; 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 ust_buffer *buf = channel->buf; struct blocked_consumer *bc; bc = (struct blocked_consumer *) malloc(sizeof(struct blocked_consumer)); @@ -565,9 +577,8 @@ void *listener_main(void *p) goto next_cmd; } bc->fd_consumer = src.fd; - bc->fd_producer = lttbuf->data_ready_fd_read; - bc->rbuf = rbuf; - bc->lttbuf = lttbuf; + bc->fd_producer = buf->data_ready_fd_read; + bc->buf = buf; bc->src = src; bc->server = ustcomm_app.server; @@ -615,21 +626,20 @@ void *listener_main(void *p) } for(i=0; inr_channels; i++) { - struct rchan *rchan = trace->channels[i].trans_channel_data; + struct ust_channel *channel = &trace->channels[i]; 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 ust_buffer *buf = channel->buf; char *reply; long consumed_old=0; - result = ltt_do_put_subbuf(rbuf, lttbuf, consumed_old); + result = ust_buffers_do_put_subbuf(buf, consumed_old); if(result < 0) { - WARN("ltt_do_put_subbuf: error (subbuf=%s)", channel_name); + WARN("ust_buffers_do_put_subbuf: error (subbuf=%s)", channel_name); asprintf(&reply, "%s", "ERROR"); } else { - DBG("ltt_do_put_subbuf: success (subbuf=%s)", channel_name); + DBG("ust_buffers_do_put_subbuf: success (subbuf=%s)", channel_name); asprintf(&reply, "%s", "OK"); } @@ -682,6 +692,19 @@ void *listener_main(void *p) WARN("could not disable marker; channel=%s, name=%s", channel_name, marker_name); } } + else if(nth_token_is(recvbuf, "get_pidunique", 0) == 1) { + char *reply; + + asprintf(&reply, "%lld", pidunique); + + result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); + if(result) { + ERR("listener: get_pidunique: ustcomm_send_reply failed"); + goto next_cmd; + } + + free(reply); + } // else if(nth_token_is(recvbuf, "get_notifications", 0) == 1) { // struct ltt_trace_struct *trace; // char trace_name[] = "auto"; @@ -740,21 +763,24 @@ void *listener_main(void *p) } } -int have_listener = 0; +volatile sig_atomic_t have_listener = 0; void create_listener(void) { #ifdef USE_CLONE static char listener_stack[16384]; + int result; #else pthread_t thread; #endif - if(have_listener) + if(have_listener) { + WARN("not creating listener because we already had one"); return; + } #ifdef USE_CLONE - result = clone(listener_main, listener_stack+sizeof(listener_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD, NULL); + result = clone((int (*)(void *)) 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; @@ -767,80 +793,11 @@ void create_listener(void) have_listener = 1; } -/* The signal handler itself. Signals must be setup so there cannot be - nested signals. */ - -void sighandler(int sig) -{ - static char have_listener = 0; - DBG("sighandler"); - - if(!have_listener) { - create_listener(); - have_listener = 1; - } -} - -/* Called by the app signal handler to chain it to us. */ - -void chain_signal(void) -{ - sighandler(USTSIGNAL); -} - static int init_socket(void) { return ustcomm_init_app(getpid(), &ustcomm_app); } -/* FIXME: reenable this to delete socket file. */ - -#if 0 -static void destroy_socket(void) -{ - int result; - - if(mysocketfile[0] == '\0') - return; - - result = unlink(mysocketfile); - if(result == -1) { - PERROR("unlink"); - } -} -#endif - -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. - */ - - int result; - struct sigaction act; - - result = sigemptyset(&act.sa_mask); - if(result == -1) { - PERROR("sigemptyset"); - return -1; - } - - 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; - } - - return 0; -} - #define AUTOPROBE_DISABLED 0 #define AUTOPROBE_ENABLE_ALL 1 #define AUTOPROBE_ENABLE_REGEX 2 @@ -875,15 +832,20 @@ static void auto_probe_connect(struct marker *m) 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 void __attribute__((constructor(1000))) init() +static void __attribute__((constructor)) init() { int result; char* autoprobe_val = NULL; + /* 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(); @@ -899,11 +861,8 @@ static void __attribute__((constructor(1000))) init() ERR("init_socket error"); return; } - result = init_signal_handler(); - if(result == -1) { - ERR("init_signal_handler error"); - return; - } + + create_listener(); autoprobe_val = getenv("UST_AUTOPROBE"); if(autoprobe_val) { @@ -988,13 +947,15 @@ static void __attribute__((constructor(1000))) init() return; } - inform_consumer_daemon(trace_name); - result = ltt_trace_start(trace_name); if(result < 0) { ERR("ltt_trace_start failed"); return; } + + /* Do this after the trace is started in order to avoid creating confusion + * if the trace fails to start. */ + inform_consumer_daemon(trace_name); } @@ -1005,31 +966,34 @@ static void __attribute__((constructor(1000))) init() } /* This is only called if we terminate normally, not with an unhandled signal, - * so we cannot rely on it. */ + * so we cannot rely on it. However, for now, LTTV requires that the header of + * the last sub-buffer contain a valid end time for the trace. This is done + * automatically only when the trace is properly stopped. + * + * If the traced program crashed, it is always possible to manually add the + * right value in the header, or to open the trace in text mode. + * + * FIXME: Fix LTTV so it doesn't need this. + */ -/* This destructor probably isn't needed, because ustd can do crash recovery. */ -#if 0 -static void __attribute__((destructor)) fini() +static void destroy_traces(void) { -// int result; + int result; /* if trace running, finish it */ -// DBG("destructor stopping traces"); + DBG("destructor stopping traces"); -// result = ltt_trace_stop("auto"); -// if(result == -1) { -// ERR("ltt_trace_stop error"); -// } -// -// result = ltt_trace_destroy("auto"); -// if(result == -1) { -// ERR("ltt_trace_destroy error"); -// } -// -// destroy_socket(); + result = ltt_trace_stop("auto"); + if(result == -1) { + ERR("ltt_trace_stop error"); + } + + result = ltt_trace_destroy("auto"); + if(result == -1) { + ERR("ltt_trace_destroy error"); + } } -#endif static int trace_recording(void) { @@ -1099,6 +1063,19 @@ static void __attribute__((destructor)) keepalive() } DBG("Finally dying..."); } + + destroy_traces(); + + ustcomm_fini_app(&ustcomm_app); +} + +void ust_potential_exec(void) +{ + trace_mark(ust, potential_exec, MARK_NOARGS); + + DBG("test"); + + keepalive(); } /* Notify ust that there was a fork. This needs to be called inside @@ -1109,14 +1086,37 @@ static void __attribute__((destructor)) keepalive() void ust_fork(void) { + struct blocked_consumer *bc; + struct blocked_consumer *deletable_bc = NULL; + int result; + DBG("ust: forking"); ltt_trace_stop("auto"); ltt_trace_destroy("auto"); - ltt_trace_alloc("auto"); - ltt_trace_start("auto"); - init_socket(); + /* Delete all active connections */ + ustcomm_close_all_connections(&ustcomm_app.server); + + /* 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); + } + have_listener = 0; create_listener(); + init_socket(); + ltt_trace_setup("auto"); + result = ltt_trace_set_type("auto", "ustrelay"); + if(result < 0) { + ERR("ltt_trace_set_type failed"); + return; + } + + ltt_trace_alloc("auto"); + ltt_trace_start("auto"); inform_consumer_daemon("auto"); }