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826d496d MD |
1 | /* |
2 | * Copyright (c) 2011 David Goulet <david.goulet@polymtl.ca> | |
fac6795d DG |
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 as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
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 along | |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
fac6795d DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <errno.h> | |
21 | #include <fcntl.h> | |
22 | #include <getopt.h> | |
23 | #include <grp.h> | |
24 | #include <limits.h> | |
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | #include <sys/stat.h> | |
29 | #include <sys/types.h> | |
30 | #include <sys/wait.h> | |
31 | #include <unistd.h> | |
32 | ||
33 | #include <lttng/liblttngctl.h> | |
34 | ||
35 | #include "lttng.h" | |
36 | #include "lttngerr.h" | |
37 | ||
38 | /* Variables */ | |
39 | static char *progname; | |
40 | ||
41 | /* Prototypes */ | |
42 | static int process_client_opt(void); | |
43 | static int process_opt_list_apps(void); | |
44 | ||
45 | /* | |
46 | * start_client | |
47 | * | |
48 | * Process client request from the command line | |
49 | * options. Every tracing action is done by the | |
50 | * liblttngctl API. | |
51 | */ | |
52 | static int process_client_opt(void) | |
53 | { | |
54 | int ret; | |
55 | ||
56 | /* Connect to the session daemon */ | |
57 | ret = lttng_connect_sessiond(); | |
58 | if (ret < 0) { | |
fac6795d DG |
59 | goto end; |
60 | } | |
61 | ||
62 | if (opt_list_apps) { | |
63 | ret = process_opt_list_apps(); | |
64 | if (ret < 0) { | |
fac6795d DG |
65 | goto end; |
66 | } | |
67 | } | |
68 | ||
69 | return 0; | |
70 | ||
71 | end: | |
ebafd2a5 | 72 | ERR("%s", lttng_get_readable_code(ret)); |
fac6795d DG |
73 | return ret; |
74 | } | |
75 | ||
76 | /* | |
77 | * process_opt_list_apps | |
78 | * | |
79 | * Get the UST traceable pid list and print | |
80 | * them to the user. | |
81 | */ | |
82 | static int process_opt_list_apps(void) | |
83 | { | |
84 | int i, ret; | |
85 | pid_t *pids; | |
86 | FILE *fp; | |
87 | char path[24]; /* Can't go bigger than /proc/65535/cmdline */ | |
88 | char cmdline[PATH_MAX]; | |
89 | ||
90 | ret = lttng_ust_list_apps(&pids); | |
91 | if (ret < 0) { | |
92 | goto error; | |
93 | } | |
94 | ||
95 | MSG("LTTng UST traceable application [name (pid)]:"); | |
96 | for (i=0; i < ret; i++) { | |
97 | snprintf(path, sizeof(path), "/proc/%d/cmdline", pids[i]); | |
98 | fp = fopen(path, "r"); | |
99 | if (fp == NULL) { | |
100 | continue; | |
101 | } | |
102 | ret = fread(cmdline, 1, sizeof(cmdline), fp); | |
103 | MSG("\t%s (%d)", cmdline, pids[i]); | |
104 | fclose(fp); | |
105 | } | |
106 | ||
e065084a DG |
107 | /* Allocated by lttng_ust_list_apps() */ |
108 | free(pids); | |
109 | ||
fac6795d DG |
110 | return 0; |
111 | ||
112 | error: | |
113 | return ret; | |
114 | } | |
115 | ||
116 | /* | |
117 | * check_ltt_sessiond | |
118 | * | |
119 | * Check if the session daemon is available using | |
120 | * the liblttngctl API for the check. | |
121 | */ | |
122 | static int check_ltt_sessiond(void) | |
123 | { | |
124 | int ret; | |
125 | ||
126 | ret = lttng_check_session_daemon(); | |
127 | if (ret < 0) { | |
128 | ERR("No session daemon found. Aborting."); | |
129 | } | |
130 | ||
131 | return ret; | |
132 | } | |
133 | ||
134 | ||
135 | /* | |
136 | * clean_exit | |
137 | */ | |
138 | void clean_exit(int code) | |
139 | { | |
140 | DBG("Clean exit"); | |
141 | exit(code); | |
142 | } | |
143 | ||
144 | /* | |
145 | * main | |
146 | */ | |
147 | int main(int argc, char *argv[]) | |
148 | { | |
149 | int ret; | |
150 | ||
151 | progname = argv[0] ? argv[0] : "lttng"; | |
152 | ||
153 | /* For Mathieu Desnoyers aka Dr Tracing */ | |
154 | if (strncmp(progname, "drtrace", 7) == 0) { | |
155 | MSG("%c[%d;%dmWelcome back Dr Tracing!%c[%dm\n\n", 27,1,33,27,0); | |
156 | } | |
157 | ||
158 | ret = parse_args(argc, (const char **) argv); | |
159 | if (ret < 0) { | |
160 | return EXIT_FAILURE; | |
161 | } | |
162 | ||
163 | if (opt_tracing_group != NULL) { | |
164 | DBG("Set tracing group to '%s'", opt_tracing_group); | |
165 | lttng_set_tracing_group(opt_tracing_group); | |
166 | } | |
167 | ||
168 | /* If ask for kernel tracing, need root perms */ | |
169 | if (opt_trace_kernel) { | |
170 | DBG("Kernel tracing activated"); | |
171 | if (getuid() != 0) { | |
172 | ERR("%s must be setuid root", progname); | |
173 | return -EPERM; | |
174 | } | |
175 | } | |
176 | ||
177 | /* Check if the lttng session daemon is running. | |
178 | * If no, a daemon will be spawned. | |
179 | */ | |
180 | if (check_ltt_sessiond() < 0) { | |
181 | return EXIT_FAILURE; | |
182 | } | |
183 | ||
184 | ret = process_client_opt(); | |
185 | if (ret < 0) { | |
186 | return ret; | |
187 | } | |
188 | ||
189 | return 0; | |
190 | } |