X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=lttng%2Fcommands%2Fadd_channel.c;fp=lttng%2Fcommands%2Fadd_channel.c;h=6b41e875affd59b68fa44af1b8f2d5481fd03fe6;hp=0000000000000000000000000000000000000000;hb=f3ed775ef4842019b396f06095b053c3a70bc3c8;hpb=d686b40f66ea5df5ac0b9405991bbc33348b0a88 diff --git a/lttng/commands/add_channel.c b/lttng/commands/add_channel.c new file mode 100644 index 000000000..6b41e875a --- /dev/null +++ b/lttng/commands/add_channel.c @@ -0,0 +1,217 @@ +/* + * Copyright (C) 2011 - David Goulet + * + * 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 +#include +#include +#include +#include +#include +#include + +#include "cmd.h" +#include "config.h" +#include "utils.h" + +static char *opt_channel_name; +static char *opt_kernel; +static char *opt_cmd_name; +static int opt_pid_all; +static int opt_userspace; +static pid_t opt_pid; +static struct lttng_channel chan; + +enum { + OPT_HELP = 1, + OPT_DISCARD, + OPT_OVERWRITE, + OPT_SUBBUF_SIZE, + OPT_NUM_SUBBUF, + OPT_SWITCH_TIMER, + OPT_READ_TIMER, + 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_STRING | POPT_ARGFLAG_OPTIONAL, 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}, + {"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}, + {"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}, + {0, 0, 0, 0, 0, 0, 0} +}; + +/* + * usage + */ +static void usage(FILE *ofp) +{ + fprintf(ofp, "usage: lttng add-channel NAME [options] [channel_options]\n"); + fprintf(ofp, "\n"); + fprintf(ofp, " -h, --help Show this help\n"); + fprintf(ofp, " -k, --kernel Apply on the kernel tracer\n"); + fprintf(ofp, " -u, --userspace [CMD] Apply on 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"); + fprintf(ofp, "Channel options:\n"); + fprintf(ofp, " --discard Discard event when buffers are full (default)\n"); + fprintf(ofp, " --overwrite Flight recorder mode\n"); + fprintf(ofp, " --subbuf_size Subbuffer size in bytes (default: 4096)\n"); + fprintf(ofp, " --num_subbuf Number of subbufers (default: 2)\n"); + fprintf(ofp, " --switch_timer Switch timer interval in usec (default: 0)\n"); + fprintf(ofp, " --read_timer Read timer interval in usec (default: 200)\n"); + fprintf(ofp, "\n"); +} + +/* + * add_channel + * + * Adding channel using the lttng API. + */ +static int add_channel(void) +{ + int ret = CMD_SUCCESS; + + if (set_session_name() < 0) { + ret = CMD_ERROR; + goto error; + } + + /* Copy channel name and normalize it */ + strncpy(chan.name, opt_channel_name, NAME_MAX); + chan.name[NAME_MAX - 1] = '\0'; + + /* Kernel tracer action */ + if (opt_kernel) { + /* Create kernel channel */ + ret = lttng_kernel_create_channel(&chan); + if (ret < 0) { + goto error; + } + } 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; + } + + MSG("Channel %s created", opt_channel_name); + +error: + return ret; +} + +/* + * init_channel_config + * + * Default value for channel configuration. + */ +static void init_channel_config(void) +{ + chan.attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; + chan.attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE; + chan.attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM; + chan.attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; + chan.attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; +} + +/* + * cmd_add_channel + * + * Add channel to trace session + */ +int cmd_add_channel(int argc, const char **argv) +{ + int opt, ret; + static poptContext pc; + + init_channel_config(); + + 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; + opt_cmd_name = poptGetOptArg(pc); + break; + case OPT_DISCARD: + chan.attr.overwrite = 0; + DBG("Channel set to discard"); + break; + case OPT_OVERWRITE: + chan.attr.overwrite = 1; + DBG("Channel set to overwrite"); + break; + case OPT_SUBBUF_SIZE: + chan.attr.subbuf_size = atol(poptGetOptArg(pc)); + DBG("Channel subbuf size set to %lu", chan.attr.subbuf_size); + break; + case OPT_NUM_SUBBUF: + chan.attr.num_subbuf = atoi(poptGetOptArg(pc)); + DBG("Channel subbuf num set to %lu", chan.attr.num_subbuf); + break; + case OPT_SWITCH_TIMER: + chan.attr.switch_timer_interval = atoi(poptGetOptArg(pc)); + DBG("Channel switch timer interval set to %d", chan.attr.switch_timer_interval); + break; + case OPT_READ_TIMER: + chan.attr.read_timer_interval = atoi(poptGetOptArg(pc)); + DBG("Channel read timer interval set to %d", chan.attr.read_timer_interval); + break; + default: + usage(stderr); + ret = CMD_UNDEFINED; + goto end; + } + } + + opt_channel_name = (char*) poptGetArg(pc); + if (opt_channel_name == NULL) { + ERR("Missing channel name.\n"); + usage(stderr); + ret = CMD_SUCCESS; + goto end; + } + + ret = add_channel(); + +end: + return ret; +}