Add a '--list-options' option to each command.
[lttng-tools.git] / src / bin / lttng / commands / stop.c
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 "../command.h"
29
30 static char *opt_session_name;
31
32 enum {
33 OPT_HELP = 1,
34 OPT_LIST_OPTIONS,
35 };
36
37 static struct poptOption long_options[] = {
38 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
39 {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
40 {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
41 {0, 0, 0, 0, 0, 0, 0}
42 };
43
44 /*
45 * usage
46 */
47 static void usage(FILE *ofp)
48 {
49 fprintf(ofp, "usage: lttng stop [options] [NAME]\n");
50 fprintf(ofp, "\n");
51 fprintf(ofp, "Where NAME is an optional session name. If not specified, lttng will\n");
52 fprintf(ofp, "get it from the configuration directory (.lttng).\n");
53 fprintf(ofp, "\n");
54 fprintf(ofp, " -h, --help Show this help\n");
55 fprintf(ofp, " --list-options Simple listing of options\n");
56 fprintf(ofp, "\n");
57 }
58
59 /*
60 * Start tracing for all trace of the session.
61 */
62 static int stop_tracing(void)
63 {
64 int ret = CMD_SUCCESS;
65 char *session_name;
66
67 if (opt_session_name == NULL) {
68 session_name = get_session_name();
69 if (session_name == NULL) {
70 ret = CMD_ERROR;
71 goto error;
72 }
73 } else {
74 session_name = opt_session_name;
75 }
76
77 ret = lttng_stop_tracing(session_name);
78 if (ret < 0) {
79 goto free_name;
80 }
81
82 MSG("Tracing stopped for session %s", session_name);
83
84 free_name:
85 if (opt_session_name == NULL) {
86 free(session_name);
87 }
88
89 error:
90 return ret;
91 }
92
93 /*
94 * cmd_stop
95 *
96 * The 'stop <options>' first level command
97 */
98 int cmd_stop(int argc, const char **argv)
99 {
100 int opt, ret;
101 static poptContext pc;
102
103 pc = poptGetContext(NULL, argc, argv, long_options, 0);
104 poptReadDefaultConfig(pc, 0);
105
106 while ((opt = poptGetNextOpt(pc)) != -1) {
107 switch (opt) {
108 case OPT_HELP:
109 usage(stderr);
110 ret = CMD_SUCCESS;
111 goto end;
112 case OPT_LIST_OPTIONS:
113 list_cmd_options(stdout, long_options);
114 ret = CMD_SUCCESS;
115 goto end;
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
127 end:
128 return ret;
129 }
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