Introduce utils_parse_time_suffix

[lttng-tools.git] / src / bin / lttng / commands / enable_channels.c

diff --git a/src/bin/lttng/commands/enable_channels.c b/src/bin/lttng/commands/enable_channels.c
index fa8513e72320c1f835af634fed3f14dbca5d18d8..214c8a3621660c8cf83cbd31edf26e7b7c06aebc 100644 (file)
--- a/src/bin/lttng/commands/enable_channels.c
+++ b/src/bin/lttng/commands/enable_channels.c
@@ -46,11 +46,21 @@ static int opt_buffer_pid;
 static int opt_buffer_global;
 static struct {
        bool set;
-       uint32_t interval;
+       uint64_t interval;
 } opt_monitor_timer;
+static struct {
+       bool set;
+       int64_t value;
+} opt_blocking_timeout;
 
 static struct mi_writer *writer;
 
+#ifdef LTTNG_EMBED_HELP
+static const char help_msg[] =
+#include <lttng-enable-channel.1.h>
+;
+#endif
+
 enum {
        OPT_HELP = 1,
        OPT_DISCARD,
@@ -64,6 +74,7 @@ enum {
        OPT_LIST_OPTIONS,
        OPT_TRACEFILE_SIZE,
        OPT_TRACEFILE_COUNT,
+       OPT_BLOCKING_TIMEOUT,
 };
 
 static struct lttng_handle *handle;
@@ -91,6 +102,7 @@ static struct poptOption long_options[] = {
        {"buffers-global", 0,   POPT_ARG_VAL, &opt_buffer_global, 1, 0, 0},
        {"tracefile-size", 'C',   POPT_ARG_INT, 0, OPT_TRACEFILE_SIZE, 0, 0},
        {"tracefile-count", 'W',   POPT_ARG_INT, 0, OPT_TRACEFILE_COUNT, 0, 0},
+       {"blocking-timeout",     0,   POPT_ARG_INT, 0, OPT_BLOCKING_TIMEOUT, 0, 0},
        {0, 0, 0, 0, 0, 0, 0}
 };
 
@@ -102,6 +114,8 @@ static void set_default_attr(struct lttng_domain *dom)
 {
        struct lttng_channel_attr default_attr;
 
+       memset(&default_attr, 0, sizeof(default_attr));
+
        /* Set attributes */
        lttng_channel_set_default_attr(dom, &default_attr);
 
@@ -143,6 +157,15 @@ static int enable_channel(char *session_name)
 
        memset(&dom, 0, sizeof(dom));
 
+       /* Validate options. */
+       if (opt_kernel) {
+               if (opt_blocking_timeout.set) {
+                       ERR("Retry timeout option not supported for kernel domain (-k)");
+                       ret = CMD_ERROR;
+                       goto error;
+               }
+       }
+
        /* Create lttng domain */
        if (opt_kernel) {
                dom.type = LTTNG_DOMAIN_KERNEL;
@@ -254,6 +277,15 @@ static int enable_channel(char *session_name)
                                goto error;
                        }
                }
+               if (opt_blocking_timeout.set) {
+                       ret = lttng_channel_set_blocking_timeout(channel,
+                                       opt_blocking_timeout.value);
+                       if (ret) {
+                               ERR("Failed to set the channel's blocking timeout");
+                               error = 1;
+                               goto error;
+                       }
+               }
 
                DBG("Enabling channel %s", channel_name);
 
@@ -368,6 +400,7 @@ int cmd_enable_channels(int argc, const char **argv)
        static poptContext pc;
        char *session_name = NULL;
        char *opt_arg = NULL;
+       const char *leftover = NULL;
 
        init_channel_config();
 
@@ -502,24 +535,70 @@ int cmd_enable_channels(int argc, const char **argv)
                }
                case OPT_MONITOR_TIMER:
                {
-                       unsigned long v;
+                       uint64_t v;
 
                        errno = 0;
                        opt_arg = poptGetOptArg(pc);
-                       v = strtoul(opt_arg, NULL, 0);
-                       if (errno != 0 || !isdigit(opt_arg[0])) {
-                               ERR("Wrong value in --monitor-timer parameter: %s", opt_arg);
+
+                       if (utils_parse_time_suffix(opt_arg, &v) < 0) {
+                               ERR("Wrong value for --monitor-timer parameter: %s", opt_arg);
                                ret = CMD_ERROR;
                                goto end;
                        }
-                       if (v != (uint32_t) v) {
-                               ERR("32-bit overflow in --monitor-timer parameter: %s", opt_arg);
+                       opt_monitor_timer.interval = (uint64_t) v;
+                       opt_monitor_timer.set = true;
+                       DBG("Channel monitor timer interval set to %" PRIu64" (µs)", opt_monitor_timer.interval);
+                       break;
+               }
+               case OPT_BLOCKING_TIMEOUT:
+               {
+                       uint64_t v;
+                       long long v_msec;
+
+                       errno = 0;
+                       opt_arg = poptGetOptArg(pc);
+
+                       if (strcmp(opt_arg, "inf") == 0) {
+                               opt_blocking_timeout.value = (int64_t) -1;
+                               opt_blocking_timeout.set = true;
+                               DBG("Channel blocking timeout set to infinity");
+                               break;
+                       }
+
+                       if (utils_parse_time_suffix(opt_arg, &v) < 0) {
+                               ERR("Wrong value for --blocking-timeout parameter: %s", opt_arg);
                                ret = CMD_ERROR;
                                goto end;
                        }
-                       opt_monitor_timer.interval = (uint32_t) v;
-                       opt_monitor_timer.set = true;
-                       DBG("Channel monitor timer interval set to %d", opt_monitor_timer.interval);
+
+                       /*
+                        * While LTTng-UST and LTTng-tools will accept a
+                        * blocking timeout expressed in µs, the current
+                        * tracer implementation relies on poll() which
+                        * takes an "int timeout" parameter expressed in
+                        * msec.
+                        *
+                        * Since the error reporting from the tracer is
+                        * not precise, we perform this check here to
+                        * provide a helpful error message in case of
+                        * overflow.
+                        *
+                        * The setter (liblttng-ctl) also performs an
+                        * equivalent check.
+                        */
+                       v_msec = v / 1000;
+                       if (v_msec != (int32_t) v_msec) {
+                               ERR("32-bit milliseconds overflow in --blocking-timeout parameter: %s", opt_arg);
+                               ret = CMD_ERROR;
+                               goto end;
+                       }
+
+                       opt_blocking_timeout.value = (int64_t) v;
+                       opt_blocking_timeout.set = true;
+                       DBG("Channel blocking timeout set to %" PRId64 " µs%s",
+                                       opt_blocking_timeout.value,
+                                       opt_blocking_timeout.value == 0 ?
+                                               " (non-blocking)" : "");
                        break;
                }
                case OPT_USERSPACE:
@@ -572,6 +651,14 @@ int cmd_enable_channels(int argc, const char **argv)
                goto end;
        }
 
+       if (chan_opts.attr.overwrite == 1 && opt_blocking_timeout.set &&
+                       opt_blocking_timeout.value != 0) {
+               ERR("You cannot specify --overwrite and --blocking-timeout=N, "
+                       "where N is different than 0");
+               ret = CMD_ERROR;
+               goto end;
+       }
+
        /* Mi check */
        if (lttng_opt_mi) {
                writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
@@ -605,6 +692,14 @@ int cmd_enable_channels(int argc, const char **argv)
                goto mi_closing;
        }
 
+       leftover = poptGetArg(pc);
+       if (leftover) {
+               ERR("Unknown argument: %s", leftover);
+               ret = CMD_ERROR;
+               success = 0;
+               goto mi_closing;
+       }
+
        if (!opt_session_name) {
                session_name = get_session_name();
                if (session_name == NULL) {