Add disable kernel channel support

[lttng-tools.git] / lttng / commands / disable_channels.c

diff --git a/lttng/commands/disable_channels.c b/lttng/commands/disable_channels.c
new file mode 100644 (file)
index 0000000..ad2f0bf
--- /dev/null
+++ b/lttng/commands/disable_channels.c
@@ -0,0 +1,158 @@
+/*
+ * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#define _GNU_SOURCE
+#include <popt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "cmd.h"
+#include "conf.h"
+#include "utils.h"
+
+static char *opt_channels;
+static char *opt_kernel;
+static int opt_pid_all;
+static int opt_userspace;
+static pid_t opt_pid;
+
+enum {
+       OPT_HELP = 1,
+       OPT_USERSPACE,
+};
+
+static struct poptOption long_options[] = {
+       /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
+       {"help",           'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
+       {"kernel",         'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
+       {"userspace",      'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0},
+       {"all",            0,   POPT_ARG_VAL, &opt_pid_all, 1, 0, 0},
+       {"pid",            'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
+       {0, 0, 0, 0, 0, 0, 0}
+};
+
+/*
+ * usage
+ */
+static void usage(FILE *ofp)
+{
+       fprintf(ofp, "usage: lttng disable-channel NAME[,NAME2,...] [options]\n");
+       fprintf(ofp, "\n");
+       fprintf(ofp, "  -h, --help            Show this help\n");
+       fprintf(ofp, "  -k, --kernel          Apply for the kernel tracer\n");
+       fprintf(ofp, "  -u, --userspace       Apply for the user-space tracer\n");
+       fprintf(ofp, "      --all             If -u, apply on all traceable apps\n");
+       fprintf(ofp, "  -p, --pid PID         If -u, apply on a specific PID\n");
+       fprintf(ofp, "\n");
+}
+
+/*
+ *  disable_channels
+ *
+ *  Disabling channel using the lttng API.
+ */
+static int disable_channels(void)
+{
+       int ret = CMD_SUCCESS;
+       char *channel_name;
+
+       if (set_session_name() < 0) {
+               ret = CMD_ERROR;
+               goto error;
+       }
+
+       /* Strip channel list */
+       channel_name = strtok(opt_channels, ",");
+       while (channel_name != NULL) {
+               /* Kernel tracer action */
+               if (opt_kernel) {
+                       DBG("Disabling kernel channel %s", channel_name);
+                       ret = lttng_kernel_disable_channel(channel_name);
+                       if (ret < 0) {
+                               goto error;
+                       } else {
+                               MSG("Kernel channel disabled %s", channel_name);
+                       }
+               } else if (opt_userspace) {             /* User-space tracer action */
+                       /*
+                        * TODO: Waiting on lttng UST 2.0
+                        */
+                       if (opt_pid_all) {
+                       } else if (opt_pid != 0) {
+                       }
+                       ret = CMD_NOT_IMPLEMENTED;
+                       goto error;
+               } else {
+                       ERR("Please specify a tracer (kernel or user-space)");
+                       goto error;
+               }
+
+               /* Next channel */
+               channel_name = strtok(NULL, ",");
+       }
+
+error:
+       return ret;
+}
+
+/*
+ *  cmd_disable_channels
+ *
+ *  Disable channel to trace session
+ */
+int cmd_disable_channels(int argc, const char **argv)
+{
+       int opt, ret;
+       static poptContext pc;
+
+       pc = poptGetContext(NULL, argc, argv, long_options, 0);
+       poptReadDefaultConfig(pc, 0);
+
+       while ((opt = poptGetNextOpt(pc)) != -1) {
+               switch (opt) {
+               case OPT_HELP:
+                       usage(stderr);
+                       ret = CMD_SUCCESS;
+                       goto end;
+               case OPT_USERSPACE:
+                       opt_userspace = 1;
+                       break;
+               default:
+                       usage(stderr);
+                       ret = CMD_UNDEFINED;
+                       goto end;
+               }
+       }
+
+       opt_channels = (char*) poptGetArg(pc);
+       if (opt_channels == NULL) {
+               ERR("Missing channel name(s).\n");
+               usage(stderr);
+               ret = CMD_SUCCESS;
+               goto end;
+       }
+
+       ret = disable_channels();
+
+end:
+       return ret;
+}