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 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.
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.
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/>.
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;