Add a '--list-options' option to each command.
[lttng-tools.git] / src / bin / lttng / commands / start.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 start [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
61 *
62 * Start tracing for all trace of the session.
63 */
64 static int start_tracing(void)
65 {
66 int ret = CMD_SUCCESS;
67 char *session_name;
68
69 if (opt_session_name == NULL) {
70 session_name = get_session_name();
71 if (session_name == NULL) {
72 ret = CMD_ERROR;
73 goto error;
74 }
75 } else {
76 session_name = opt_session_name;
77 }
78
79 DBG("Starting tracing for session %s", session_name);
80
81 ret = lttng_start_tracing(session_name);
82 if (ret < 0) {
83 goto free_name;
84 }
85
86 MSG("Tracing started for session %s", session_name);
87
88 free_name:
89 if (opt_session_name == NULL) {
90 free(session_name);
91 }
92 error:
93 return ret;
94 }
95
96 /*
97 * cmd_start
98 *
99 * The 'start <options>' first level command
100 */
101 int cmd_start(int argc, const char **argv)
102 {
103 int opt, ret;
104 static poptContext pc;
105
106 pc = poptGetContext(NULL, argc, argv, long_options, 0);
107 poptReadDefaultConfig(pc, 0);
108
109 while ((opt = poptGetNextOpt(pc)) != -1) {
110 switch (opt) {
111 case OPT_HELP:
112 usage(stderr);
113 ret = CMD_SUCCESS;
114 goto end;
115 case OPT_LIST_OPTIONS:
116 list_cmd_options(stdout, long_options);
117 ret = CMD_SUCCESS;
118 goto end;
119 default:
120 usage(stderr);
121 ret = CMD_UNDEFINED;
122 goto end;
123 }
124 }
125
126 opt_session_name = (char*) poptGetArg(pc);
127
128 ret = start_tracing();
129
130 end:
131 return ret;
132 }
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