| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; only version 2 |
| 7 | * of the License. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #define _GNU_SOURCE |
| 20 | #include <popt.h> |
| 21 | #include <stdio.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <string.h> |
| 24 | #include <sys/stat.h> |
| 25 | #include <sys/types.h> |
| 26 | #include <unistd.h> |
| 27 | |
| 28 | #include "../cmd.h" |
| 29 | #include "../conf.h" |
| 30 | #include "../utils.h" |
| 31 | |
| 32 | static char *opt_session_name; |
| 33 | |
| 34 | enum { |
| 35 | OPT_HELP = 1, |
| 36 | }; |
| 37 | |
| 38 | static struct lttng_handle *handle; |
| 39 | |
| 40 | static struct poptOption long_options[] = { |
| 41 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ |
| 42 | {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0}, |
| 43 | {0, 0, 0, 0, 0, 0, 0} |
| 44 | }; |
| 45 | |
| 46 | /* |
| 47 | * usage |
| 48 | */ |
| 49 | static void usage(FILE *ofp) |
| 50 | { |
| 51 | fprintf(ofp, "usage: lttng start [options] [NAME]\n"); |
| 52 | fprintf(ofp, "\n"); |
| 53 | fprintf(ofp, "Where NAME is an optional session name. If not specified, lttng will\n"); |
| 54 | fprintf(ofp, "get it from the configuration directory (.lttng).\n"); |
| 55 | fprintf(ofp, "\n"); |
| 56 | fprintf(ofp, " -h, --help Show this help\n"); |
| 57 | fprintf(ofp, "\n"); |
| 58 | } |
| 59 | |
| 60 | /* |
| 61 | * start_tracing |
| 62 | * |
| 63 | * Start tracing for all trace of the session. |
| 64 | */ |
| 65 | static int start_tracing(void) |
| 66 | { |
| 67 | int ret = CMD_SUCCESS; |
| 68 | char *session_name; |
| 69 | |
| 70 | if (opt_session_name == NULL) { |
| 71 | session_name = get_session_name(); |
| 72 | if (session_name == NULL) { |
| 73 | ret = CMD_ERROR; |
| 74 | goto error; |
| 75 | } |
| 76 | } else { |
| 77 | session_name = opt_session_name; |
| 78 | } |
| 79 | |
| 80 | handle = lttng_create_handle(session_name, NULL); |
| 81 | if (handle == NULL) { |
| 82 | ret = -1; |
| 83 | goto error; |
| 84 | } |
| 85 | |
| 86 | DBG("Starting tracing for session %s", session_name); |
| 87 | |
| 88 | ret = lttng_start_tracing(handle); |
| 89 | if (ret < 0) { |
| 90 | goto free_name; |
| 91 | } |
| 92 | |
| 93 | MSG("Tracing started for session %s", session_name); |
| 94 | |
| 95 | free_name: |
| 96 | if (opt_session_name == NULL) { |
| 97 | free(session_name); |
| 98 | } |
| 99 | error: |
| 100 | lttng_destroy_handle(handle); |
| 101 | |
| 102 | return ret; |
| 103 | } |
| 104 | |
| 105 | /* |
| 106 | * cmd_start |
| 107 | * |
| 108 | * The 'start <options>' first level command |
| 109 | */ |
| 110 | int cmd_start(int argc, const char **argv) |
| 111 | { |
| 112 | int opt, ret; |
| 113 | static poptContext pc; |
| 114 | |
| 115 | pc = poptGetContext(NULL, argc, argv, long_options, 0); |
| 116 | poptReadDefaultConfig(pc, 0); |
| 117 | |
| 118 | while ((opt = poptGetNextOpt(pc)) != -1) { |
| 119 | switch (opt) { |
| 120 | case OPT_HELP: |
| 121 | usage(stderr); |
| 122 | ret = CMD_SUCCESS; |
| 123 | goto end; |
| 124 | default: |
| 125 | usage(stderr); |
| 126 | ret = CMD_UNDEFINED; |
| 127 | goto end; |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | opt_session_name = (char*) poptGetArg(pc); |
| 132 | |
| 133 | ret = start_tracing(); |
| 134 | |
| 135 | end: |
| 136 | return ret; |
| 137 | } |