Add lttng-error.h containing every API err. code
[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 modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
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 *
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.
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
27 #include "../command.h"
28
29 #include <common/sessiond-comm/sessiond-comm.h>
30
31 static char *opt_session_name;
32
33 enum {
34 OPT_HELP = 1,
35 OPT_LIST_OPTIONS,
36 };
37
38 static struct poptOption long_options[] = {
39 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
40 {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
41 {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
42 {0, 0, 0, 0, 0, 0, 0}
43 };
44
45 /*
46 * usage
47 */
48 static void usage(FILE *ofp)
49 {
50 fprintf(ofp, "usage: lttng start [NAME] [OPTIONS]\n");
51 fprintf(ofp, "\n");
52 fprintf(ofp, "Where NAME is an optional session name. If not specified, lttng will\n");
53 fprintf(ofp, "get it from the configuration directory (.lttng).\n");
54 fprintf(ofp, "\n");
55 fprintf(ofp, "Options:\n");
56 fprintf(ofp, " -h, --help Show this help\n");
57 fprintf(ofp, " --list-options Simple listing of options\n");
58 fprintf(ofp, "\n");
59 }
60
61 /*
62 * start_tracing
63 *
64 * Start tracing for all trace of the session.
65 */
66 static int start_tracing(void)
67 {
68 int ret;
69 char *session_name;
70
71 if (opt_session_name == NULL) {
72 session_name = get_session_name();
73 if (session_name == NULL) {
74 ret = CMD_ERROR;
75 goto error;
76 }
77 } else {
78 session_name = opt_session_name;
79 }
80
81 DBG("Starting tracing for session %s", session_name);
82
83 ret = lttng_start_tracing(session_name);
84 if (ret < 0) {
85 switch (-ret) {
86 case LTTNG_ERR_TRACE_ALREADY_STARTED:
87 WARN("Tracing already started for session %s", session_name);
88 break;
89 default:
90 ERR("%s", lttng_strerror(ret));
91 break;
92 }
93 goto free_name;
94 }
95
96 ret = CMD_SUCCESS;
97
98 MSG("Tracing started for session %s", session_name);
99
100 free_name:
101 if (opt_session_name == NULL) {
102 free(session_name);
103 }
104 error:
105 return ret;
106 }
107
108 /*
109 * cmd_start
110 *
111 * The 'start <options>' first level command
112 */
113 int cmd_start(int argc, const char **argv)
114 {
115 int opt, ret = CMD_SUCCESS;
116 static poptContext pc;
117
118 pc = poptGetContext(NULL, argc, argv, long_options, 0);
119 poptReadDefaultConfig(pc, 0);
120
121 while ((opt = poptGetNextOpt(pc)) != -1) {
122 switch (opt) {
123 case OPT_HELP:
124 usage(stdout);
125 goto end;
126 case OPT_LIST_OPTIONS:
127 list_cmd_options(stdout, long_options);
128 goto end;
129 default:
130 usage(stderr);
131 ret = CMD_UNDEFINED;
132 goto end;
133 }
134 }
135
136 opt_session_name = (char*) poptGetArg(pc);
137
138 ret = start_tracing();
139
140 end:
141 poptFreeContext(pc);
142 return ret;
143 }
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