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;
50 static int help(void) {
52 printf("%s [OPTIONS...] {COMMAND} ...\n\n"
53 "Send control commands to or query the journal.\n\n"
54 " -h --help Show this help\n"
55 " --version Show package version\n"
56 " --no-pager Do not pipe output into a pager\n"
57 " -a --all Show all properties, including long and unprintable\n"
58 " -f --follow Follow journal\n"
59 " -n --lines=INTEGER Journal entries to show\n"
60 " --no-tail Show all lines, even in follow mode\n"
61 " -o --output=STRING Change journal output mode (short, short-monotonic,\n"
62 " verbose, export, json, cat)\n"
63 " -q --quiet Don't show privilege warning\n"
64 " --new-id128 Generate a new 128 Bit id\n",
65 program_invocation_short_name
);
70 static int parse_argv(int argc
, char *argv
[]) {
79 static const struct option options
[] = {
80 { "help", no_argument
, NULL
, 'h' },
81 { "version" , no_argument
, NULL
, ARG_VERSION
},
82 { "no-pager", no_argument
, NULL
, ARG_NO_PAGER
},
83 { "follow", no_argument
, NULL
, 'f' },
84 { "output", required_argument
, NULL
, 'o' },
85 { "all", no_argument
, NULL
, 'a' },
86 { "lines", required_argument
, NULL
, 'n' },
87 { "no-tail", no_argument
, NULL
, ARG_NO_TAIL
},
88 { "new-id128", no_argument
, NULL
, ARG_NEW_ID128
},
89 { "quiet", no_argument
, NULL
, 'q' },
98 while ((c
= getopt_long(argc
, argv
, "hfo:an:q", options
, NULL
)) >= 0) {
107 puts(PACKAGE_STRING
);
109 puts(SYSTEMD_FEATURES
);
121 arg_output
= output_mode_from_string(optarg
);
122 if (arg_output
< 0) {
123 log_error("Unknown output '%s'.", optarg
);
134 r
= safe_atoi(optarg
, &arg_lines
);
135 if (r
< 0 || arg_lines
< 0) {
136 log_error("Failed to parse lines '%s'", optarg
);
146 arg_new_id128
= true;
157 log_error("Unknown option code %c", c
);
162 if (arg_follow
&& !arg_no_tail
&& arg_lines
< 0)
168 static int generate_new_id128(void) {
173 r
= sd_id128_randomize(&id
);
175 log_error("Failed to generate ID: %s", strerror(-r
));
179 printf("As string:\n"
180 SD_ID128_FORMAT_STR
"\n\n"
182 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\n\n"
184 "#define MESSAGE_XYZ SD_ID128_MAKE(",
185 SD_ID128_FORMAT_VAL(id
),
186 SD_ID128_FORMAT_VAL(id
));
188 for (i
= 0; i
< 16; i
++)
189 printf("%02x%s", id
.bytes
[i
], i
!= 15 ? "," : "");
191 fputs(")\n", stdout
);
196 int main(int argc
, char *argv
[]) {
198 sd_journal
*j
= NULL
;
200 bool need_seek
= false;
202 log_parse_environment();
205 r
= parse_argv(argc
, argv
);
210 r
= generate_new_id128();
215 if (!arg_quiet
&& geteuid() != 0 && in_group("adm") <= 0)
216 log_warning("Showing user generated messages only. Users in the group 'adm' can see all messages. Pass -q to turn this message off.");
219 r
= sd_journal_open(&j
, 0);
221 log_error("Failed to open journal: %s", strerror(-r
));
225 for (i
= optind
; i
< argc
; i
++) {
226 r
= sd_journal_add_match(j
, argv
[i
], strlen(argv
[i
]));
228 log_error("Failed to add match: %s", strerror(-r
));
233 fd
= sd_journal_get_fd(j
);
235 log_error("Failed to get wakeup fd: %s", strerror(-fd
));
239 if (arg_lines
>= 0) {
240 r
= sd_journal_seek_tail(j
);
242 log_error("Failed to seek to tail: %s", strerror(-r
));
246 r
= sd_journal_previous_skip(j
, arg_lines
);
248 r
= sd_journal_seek_head(j
);
250 log_error("Failed to seek to head: %s", strerror(-r
));
254 r
= sd_journal_next(j
);
258 log_error("Failed to iterate through journal: %s", strerror(-r
));
262 if (!arg_no_pager
&& !arg_follow
) {
267 if (arg_output
== OUTPUT_JSON
) {
275 r
= sd_journal_next(j
);
277 log_error("Failed to iterate through journal: %s", strerror(-r
));
287 r
= output_journal(j
, arg_output
, line
, arg_show_all
);
297 r
= fd_wait_for_event(fd
, POLLIN
, (usec_t
) -1);
299 log_error("Couldn't wait for event: %s", strerror(-r
));
303 r
= sd_journal_process(j
);
305 log_error("Failed to process: %s", strerror(-r
));
310 if (arg_output
== OUTPUT_JSON
)
311 fputs("\n]\n", stdout
);
319 return r
< 0 ? EXIT_FAILURE
: EXIT_SUCCESS
;