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87d2c1ff LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2011 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <fcntl.h> | |
23 | #include <errno.h> | |
24 | #include <stddef.h> | |
3fbf9cbb LP |
25 | #include <string.h> |
26 | #include <stdio.h> | |
27 | #include <unistd.h> | |
28 | #include <stdlib.h> | |
50f20cfd | 29 | #include <sys/poll.h> |
72f59706 | 30 | #include <time.h> |
0d43c694 | 31 | #include <getopt.h> |
87d2c1ff | 32 | |
3fbf9cbb LP |
33 | #include "sd-journal.h" |
34 | #include "log.h" | |
72f59706 | 35 | #include "util.h" |
0d43c694 LP |
36 | #include "build.h" |
37 | #include "pager.h" | |
86aa7ba4 | 38 | #include "logs-show.h" |
250d54b5 | 39 | |
86aa7ba4 | 40 | static output_mode arg_output = OUTPUT_SHORT; |
72f59706 LP |
41 | |
42 | static bool arg_follow = false; | |
43 | static bool arg_show_all = false; | |
0d43c694 | 44 | static bool arg_no_pager = false; |
2100675e | 45 | static int arg_lines = -1; |
50f20cfd | 46 | |
0d43c694 LP |
47 | static int help(void) { |
48 | ||
49 | printf("%s [OPTIONS...] {COMMAND} ...\n\n" | |
50 | "Send control commands to or query the login manager.\n\n" | |
51 | " -h --help Show this help\n" | |
52 | " --version Show package version\n" | |
53 | " --no-pager Do not pipe output into a pager\n" | |
54 | " -a --all Show all properties, including long and unprintable\n" | |
55 | " -f --follow Follow journal\n" | |
2100675e | 56 | " -n --lines=INTEGER Lines to show\n" |
0d43c694 LP |
57 | " -o --output=STRING Change output mode (short, verbose, export, json)\n", |
58 | program_invocation_short_name); | |
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
63 | static int parse_argv(int argc, char *argv[]) { | |
64 | ||
65 | enum { | |
66 | ARG_VERSION = 0x100, | |
67 | ARG_NO_PAGER | |
68 | }; | |
69 | ||
70 | static const struct option options[] = { | |
71 | { "help", no_argument, NULL, 'h' }, | |
72 | { "version" , no_argument, NULL, ARG_VERSION }, | |
73 | { "no-pager", no_argument, NULL, ARG_NO_PAGER }, | |
74 | { "follow", no_argument, NULL, 'f' }, | |
75 | { "output", required_argument, NULL, 'o' }, | |
76 | { "all", no_argument, NULL, 'a' }, | |
2100675e | 77 | { "lines", required_argument, NULL, 'n' }, |
0d43c694 LP |
78 | { NULL, 0, NULL, 0 } |
79 | }; | |
80 | ||
2100675e | 81 | int c, r; |
0d43c694 LP |
82 | |
83 | assert(argc >= 0); | |
84 | assert(argv); | |
85 | ||
2100675e | 86 | while ((c = getopt_long(argc, argv, "hfo:an:", options, NULL)) >= 0) { |
0d43c694 LP |
87 | |
88 | switch (c) { | |
89 | ||
90 | case 'h': | |
91 | help(); | |
92 | return 0; | |
93 | ||
94 | case ARG_VERSION: | |
95 | puts(PACKAGE_STRING); | |
96 | puts(DISTRIBUTION); | |
97 | puts(SYSTEMD_FEATURES); | |
98 | return 0; | |
99 | ||
100 | case ARG_NO_PAGER: | |
101 | arg_no_pager = true; | |
102 | break; | |
103 | ||
104 | case 'f': | |
105 | arg_follow = true; | |
106 | break; | |
107 | ||
108 | case 'o': | |
109 | if (streq(optarg, "short")) | |
110 | arg_output = OUTPUT_SHORT; | |
111 | else if (streq(optarg, "verbose")) | |
112 | arg_output = OUTPUT_VERBOSE; | |
113 | else if (streq(optarg, "export")) | |
114 | arg_output = OUTPUT_EXPORT; | |
115 | else if (streq(optarg, "json")) | |
116 | arg_output = OUTPUT_JSON; | |
117 | else { | |
118 | log_error("Unknown output '%s'.", optarg); | |
119 | return -EINVAL; | |
120 | } | |
121 | break; | |
122 | ||
123 | case 'a': | |
124 | arg_show_all = true; | |
125 | break; | |
126 | ||
2100675e LP |
127 | case 'n': |
128 | r = safe_atoi(optarg, &arg_lines); | |
129 | if (r < 0) { | |
130 | log_error("Failed to parse lines '%s'", optarg); | |
131 | return -EINVAL; | |
132 | } | |
133 | break; | |
134 | ||
0d43c694 LP |
135 | case '?': |
136 | return -EINVAL; | |
137 | ||
138 | default: | |
139 | log_error("Unknown option code %c", c); | |
140 | return -EINVAL; | |
141 | } | |
142 | } | |
143 | ||
144 | return 1; | |
145 | } | |
146 | ||
87d2c1ff | 147 | int main(int argc, char *argv[]) { |
50f20cfd | 148 | int r, i, fd; |
3fbf9cbb | 149 | sd_journal *j = NULL; |
72f59706 | 150 | unsigned line = 0; |
6f003b43 | 151 | bool need_seek = false; |
3fbf9cbb | 152 | |
87d2c1ff LP |
153 | log_parse_environment(); |
154 | log_open(); | |
155 | ||
0d43c694 LP |
156 | r = parse_argv(argc, argv); |
157 | if (r <= 0) | |
158 | goto finish; | |
159 | ||
cf244689 | 160 | r = sd_journal_open(&j, 0); |
87d2c1ff LP |
161 | if (r < 0) { |
162 | log_error("Failed to open journal: %s", strerror(-r)); | |
3fbf9cbb | 163 | goto finish; |
87d2c1ff LP |
164 | } |
165 | ||
0d43c694 | 166 | for (i = optind; i < argc; i++) { |
de7b95cd LP |
167 | r = sd_journal_add_match(j, argv[i], strlen(argv[i])); |
168 | if (r < 0) { | |
169 | log_error("Failed to add match: %s", strerror(-r)); | |
170 | goto finish; | |
171 | } | |
172 | } | |
173 | ||
50f20cfd LP |
174 | fd = sd_journal_get_fd(j); |
175 | if (fd < 0) { | |
176 | log_error("Failed to get wakeup fd: %s", strerror(-fd)); | |
177 | goto finish; | |
178 | } | |
8725d60a | 179 | |
2100675e LP |
180 | if (arg_lines >= 0) { |
181 | r = sd_journal_seek_tail(j); | |
182 | if (r < 0) { | |
183 | log_error("Failed to seek to tail: %s", strerror(-r)); | |
184 | goto finish; | |
185 | } | |
186 | ||
187 | r = sd_journal_previous_skip(j, arg_lines); | |
2100675e LP |
188 | } else { |
189 | r = sd_journal_seek_head(j); | |
190 | if (r < 0) { | |
191 | log_error("Failed to seek to head: %s", strerror(-r)); | |
192 | goto finish; | |
193 | } | |
6f003b43 LP |
194 | |
195 | r = sd_journal_next(j); | |
196 | } | |
197 | ||
198 | if (r < 0) { | |
199 | log_error("Failed to iterate through journal: %s", strerror(-r)); | |
200 | goto finish; | |
50f20cfd | 201 | } |
87d2c1ff | 202 | |
0d43c694 LP |
203 | if (!arg_no_pager && !arg_follow) { |
204 | columns(); | |
205 | pager_open(); | |
206 | } | |
207 | ||
208 | if (arg_output == OUTPUT_JSON) { | |
72f59706 | 209 | fputc('[', stdout); |
0d43c694 LP |
210 | fflush(stdout); |
211 | } | |
72f59706 | 212 | |
50f20cfd LP |
213 | for (;;) { |
214 | struct pollfd pollfd; | |
215 | ||
0d43c694 | 216 | for (;;) { |
6f003b43 LP |
217 | if (need_seek) { |
218 | r = sd_journal_next(j); | |
219 | if (r < 0) { | |
220 | log_error("Failed to iterate through journal: %s", strerror(-r)); | |
221 | goto finish; | |
222 | } | |
0d43c694 LP |
223 | } |
224 | ||
225 | if (r == 0) | |
226 | break; | |
227 | ||
72f59706 | 228 | line ++; |
50f20cfd | 229 | |
86aa7ba4 | 230 | r = output_journal(j, arg_output, line, arg_show_all); |
72f59706 LP |
231 | if (r < 0) |
232 | goto finish; | |
6f003b43 LP |
233 | |
234 | need_seek = true; | |
87d2c1ff LP |
235 | } |
236 | ||
50f20cfd LP |
237 | if (!arg_follow) |
238 | break; | |
239 | ||
240 | zero(pollfd); | |
241 | pollfd.fd = fd; | |
242 | pollfd.events = POLLIN; | |
87d2c1ff | 243 | |
50f20cfd LP |
244 | if (poll(&pollfd, 1, -1) < 0) { |
245 | if (errno == EINTR) | |
246 | break; | |
c2373f84 | 247 | |
50f20cfd LP |
248 | log_error("poll(): %m"); |
249 | r = -errno; | |
250 | goto finish; | |
251 | } | |
8725d60a | 252 | |
50f20cfd LP |
253 | r = sd_journal_process(j); |
254 | if (r < 0) { | |
255 | log_error("Failed to process: %s", strerror(-r)); | |
256 | goto finish; | |
257 | } | |
de190aef | 258 | } |
87d2c1ff | 259 | |
72f59706 LP |
260 | if (arg_output == OUTPUT_JSON) |
261 | fputs("\n]\n", stdout); | |
262 | ||
87d2c1ff | 263 | finish: |
3fbf9cbb LP |
264 | if (j) |
265 | sd_journal_close(j); | |
87d2c1ff | 266 | |
0d43c694 LP |
267 | pager_close(); |
268 | ||
3fbf9cbb | 269 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
87d2c1ff | 270 | } |