1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2011 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
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 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
33 #include <systemd/sd-journal.h>
39 #include "logs-show.h"
41 static OutputMode arg_output = OUTPUT_SHORT;
42 static bool arg_follow = false;
43 static bool arg_show_all = false;
44 static bool arg_no_pager = false;
45 static int arg_lines = -1;
46 static bool arg_no_tail = false;
47 static bool arg_new_id128 = false;
48 static bool arg_quiet = false;
49 static bool arg_local = false;
51 static int help(void) {
53 printf("%s [OPTIONS...] {COMMAND} ...\n\n"
54 "Send control commands to or query the journal.\n\n"
55 " -h --help Show this help\n"
56 " --version Show package version\n"
57 " --no-pager Do not pipe output into a pager\n"
58 " -a --all Show all fields, including long and unprintable\n"
59 " -f --follow Follow journal\n"
60 " -n --lines=INTEGER Journal entries to show\n"
61 " --no-tail Show all lines, even in follow mode\n"
62 " -o --output=STRING Change journal output mode (short, short-monotonic,\n"
63 " verbose, export, json, cat)\n"
64 " -q --quiet Don't show privilege warning\n"
65 " --new-id128 Generate a new 128 Bit id\n"
66 " -l --local Only local entries\n",
67 program_invocation_short_name);
72 static int parse_argv(int argc, char *argv[]) {
81 static const struct option options[] = {
82 { "help", no_argument, NULL, 'h' },
83 { "version" , no_argument, NULL, ARG_VERSION },
84 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
85 { "follow", no_argument, NULL, 'f' },
86 { "output", required_argument, NULL, 'o' },
87 { "all", no_argument, NULL, 'a' },
88 { "lines", required_argument, NULL, 'n' },
89 { "no-tail", no_argument, NULL, ARG_NO_TAIL },
90 { "new-id128", no_argument, NULL, ARG_NEW_ID128 },
91 { "quiet", no_argument, NULL, 'q' },
92 { "local", no_argument, NULL, 'l' },
101 while ((c = getopt_long(argc, argv, "hfo:an:ql", options, NULL)) >= 0) {
110 puts(PACKAGE_STRING);
112 puts(SYSTEMD_FEATURES);
124 arg_output = output_mode_from_string(optarg);
125 if (arg_output < 0) {
126 log_error("Unknown output '%s'.", optarg);
137 r = safe_atoi(optarg, &arg_lines);
138 if (r < 0 || arg_lines < 0) {
139 log_error("Failed to parse lines '%s'", optarg);
149 arg_new_id128 = true;
164 log_error("Unknown option code %c", c);
169 if (arg_follow && !arg_no_tail && arg_lines < 0)
175 static int generate_new_id128(void) {
180 r = sd_id128_randomize(&id);
182 log_error("Failed to generate ID: %s", strerror(-r));
186 printf("As string:\n"
187 SD_ID128_FORMAT_STR "\n\n"
189 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\n\n"
191 "#define MESSAGE_XYZ SD_ID128_MAKE(",
192 SD_ID128_FORMAT_VAL(id),
193 SD_ID128_FORMAT_VAL(id));
195 for (i = 0; i < 16; i++)
196 printf("%02x%s", id.bytes[i], i != 15 ? "," : "");
198 fputs(")\n", stdout);
203 int main(int argc, char *argv[]) {
205 sd_journal *j = NULL;
207 bool need_seek = false;
209 log_parse_environment();
212 r = parse_argv(argc, argv);
217 r = generate_new_id128();
222 if (!arg_quiet && geteuid() != 0 && in_group("adm") <= 0)
223 log_warning("Showing user generated messages only. Users in the group 'adm' can see all messages. Pass -q to turn this message off.");
226 r = sd_journal_open(&j, arg_local ? SD_JOURNAL_LOCAL_ONLY : 0);
228 log_error("Failed to open journal: %s", strerror(-r));
232 for (i = optind; i < argc; i++) {
233 r = sd_journal_add_match(j, argv[i], strlen(argv[i]));
235 log_error("Failed to add match: %s", strerror(-r));
240 fd = sd_journal_get_fd(j);
242 log_error("Failed to get wakeup fd: %s", strerror(-fd));
246 if (arg_lines >= 0) {
247 r = sd_journal_seek_tail(j);
249 log_error("Failed to seek to tail: %s", strerror(-r));
253 r = sd_journal_previous_skip(j, arg_lines);
255 r = sd_journal_seek_head(j);
257 log_error("Failed to seek to head: %s", strerror(-r));
261 r = sd_journal_next(j);
265 log_error("Failed to iterate through journal: %s", strerror(-r));
269 if (!arg_no_pager && !arg_follow) {
274 if (arg_output == OUTPUT_JSON) {
282 r = sd_journal_next(j);
284 log_error("Failed to iterate through journal: %s", strerror(-r));
294 r = output_journal(j, arg_output, line, 0, arg_show_all);
304 r = fd_wait_for_event(fd, POLLIN, (usec_t) -1);
306 log_error("Couldn't wait for event: %s", strerror(-r));
310 r = sd_journal_process(j);
312 log_error("Failed to process: %s", strerror(-r));
317 if (arg_output == OUTPUT_JSON)
318 fputs("\n]\n", stdout);
326 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;