Fix: trace_ust_destroy_metadata should check for NULL pointer
[lttng-tools.git] / src / bin / lttng / commands / stop.c
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
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4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
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7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
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13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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16 */
17
18#define _GNU_SOURCE
19#include <popt.h>
20#include <stdio.h>
21#include <stdlib.h>
22#include <string.h>
23#include <sys/stat.h>
24#include <sys/types.h>
25#include <unistd.h>
26
c399183f 27#include "../command.h"
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28
29static char *opt_session_name;
30
31enum {
32 OPT_HELP = 1,
679b4943 33 OPT_LIST_OPTIONS,
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34};
35
36static struct poptOption long_options[] = {
37 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
38 {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
679b4943 39 {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
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40 {0, 0, 0, 0, 0, 0, 0}
41};
42
43/*
44 * usage
45 */
46static void usage(FILE *ofp)
47{
48 fprintf(ofp, "usage: lttng stop [options] [NAME]\n");
49 fprintf(ofp, "\n");
50 fprintf(ofp, "Where NAME is an optional session name. If not specified, lttng will\n");
51 fprintf(ofp, "get it from the configuration directory (.lttng).\n");
52 fprintf(ofp, "\n");
53 fprintf(ofp, " -h, --help Show this help\n");
679b4943 54 fprintf(ofp, " --list-options Simple listing of options\n");
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55 fprintf(ofp, "\n");
56}
57
58/*
cd80958d 59 * Start tracing for all trace of the session.
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60 */
61static int stop_tracing(void)
62{
ae856491 63 int ret;
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64 char *session_name;
65
66 if (opt_session_name == NULL) {
67 session_name = get_session_name();
68 if (session_name == NULL) {
69 ret = CMD_ERROR;
70 goto error;
71 }
72 } else {
73 session_name = opt_session_name;
74 }
75
6a4f824d 76 ret = lttng_stop_tracing(session_name);
f3ed775e 77 if (ret < 0) {
ae856491 78 /* Don't set ret so lttng can interpret the sessiond error. */
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79 goto free_name;
80 }
81
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82 ret = CMD_SUCCESS;
83
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84 MSG("Tracing stopped for session %s", session_name);
85
86free_name:
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87 if (opt_session_name == NULL) {
88 free(session_name);
89 }
cd80958d 90
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91error:
92 return ret;
93}
94
95/*
96 * cmd_stop
97 *
98 * The 'stop <options>' first level command
99 */
100int cmd_stop(int argc, const char **argv)
101{
ca1c3607 102 int opt, ret = CMD_SUCCESS;
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103 static poptContext pc;
104
105 pc = poptGetContext(NULL, argc, argv, long_options, 0);
106 poptReadDefaultConfig(pc, 0);
107
108 while ((opt = poptGetNextOpt(pc)) != -1) {
109 switch (opt) {
110 case OPT_HELP:
ca1c3607 111 usage(stdout);
f3ed775e 112 goto end;
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113 case OPT_LIST_OPTIONS:
114 list_cmd_options(stdout, long_options);
679b4943 115 goto end;
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116 default:
117 usage(stderr);
118 ret = CMD_UNDEFINED;
119 goto end;
120 }
121 }
122
123 opt_session_name = (char*) poptGetArg(pc);
124
125 ret = stop_tracing();
126
127end:
ca1c3607 128 poptFreeContext(pc);
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129 return ret;
130}
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