lttng cli: Accept human readable sizes for --subbuf-size
[lttng-tools.git] / src / bin / lttng / commands / enable_channels.c
index fbf02a0580c520fc37f9baf62cdd3ec2a962387c..039750bcb99dc8c7e95d902e5d26656eb3b8c3ea 100644 (file)
@@ -28,6 +28,7 @@
 #include "../command.h"
 
 #include <src/common/sessiond-comm/sessiond-comm.h>
+#include <src/common/utils.h>
 
 static char *opt_channels;
 static int opt_kernel;
@@ -66,7 +67,7 @@ static struct poptOption long_options[] = {
        {"userspace",      'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0},
        {"discard",        0,   POPT_ARG_NONE, 0, OPT_DISCARD, 0, 0},
        {"overwrite",      0,   POPT_ARG_NONE, 0, OPT_OVERWRITE, 0, 0},
-       {"subbuf-size",    0,   POPT_ARG_DOUBLE, 0, OPT_SUBBUF_SIZE, 0, 0},
+       {"subbuf-size",    0,   POPT_ARG_STRING, 0, OPT_SUBBUF_SIZE, 0, 0},
        {"num-subbuf",     0,   POPT_ARG_INT, 0, OPT_NUM_SUBBUF, 0, 0},
        {"switch-timer",   0,   POPT_ARG_INT, 0, OPT_SWITCH_TIMER, 0, 0},
        {"read-timer",     0,   POPT_ARG_INT, 0, OPT_READ_TIMER, 0, 0},
@@ -99,7 +100,7 @@ static void usage(FILE *ofp)
                DEFAULT_CHANNEL_OVERWRITE ? "" : " (default)");
        fprintf(ofp, "      --overwrite          Flight recorder mode%s\n",
                DEFAULT_CHANNEL_OVERWRITE ? " (default)" : "");
-       fprintf(ofp, "      --subbuf-size SIZE   Subbuffer size in bytes\n");
+       fprintf(ofp, "      --subbuf-size SIZE   Subbuffer size in bytes {+k,+M,+G}\n");
        fprintf(ofp, "                               (default: %zu, kernel default: %zu)\n",
                default_get_channel_subbuf_size(),
                default_get_kernel_channel_subbuf_size());
@@ -299,6 +300,7 @@ int cmd_enable_channels(int argc, const char **argv)
        int opt, ret = CMD_SUCCESS;
        static poptContext pc;
        char *session_name = NULL;
+       char *opt_arg = NULL;
 
        init_channel_config();
 
@@ -319,8 +321,22 @@ int cmd_enable_channels(int argc, const char **argv)
                        DBG("Channel set to overwrite");
                        break;
                case OPT_SUBBUF_SIZE:
-                       /* TODO Replace atol with strtol and check for errors */
-                       chan.attr.subbuf_size = atol(poptGetOptArg(pc));
+                       /* Parse the size */
+                       opt_arg = poptGetOptArg(pc);
+                       if (utils_parse_size_suffix(opt_arg, &chan.attr.subbuf_size) < 0) {
+                               ERR("Wrong value the --subbuf-size parameter: %s", opt_arg);
+                               ret = CMD_ERROR;
+                               goto end;
+                       }
+
+                       /* Check if power of 2 */
+                       if ((chan.attr.subbuf_size - 1) & chan.attr.subbuf_size) {
+                               ERR("The subbuf size is not a power of 2: %" PRIu64 " (%s)",
+                                               chan.attr.subbuf_size, opt_arg);
+                               ret = CMD_ERROR;
+                               goto end;
+                       }
+
                        DBG("Channel subbuf size set to %" PRIu64, chan.attr.subbuf_size);
                        break;
                case OPT_NUM_SUBBUF:
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